Fender Negative Feedback Mod

Fender Negative Feedback Mod

cobaresi1980

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I'm thinking about putting a negative feedback mod on my JVM amp to get it to JCM 800 specs, reversible of course but I read increasing the negative feedback makes the presence control inactive, so my question is if that's the case how come a JCM 800 doesn't have that problem with its presence control if it's the same amount of NFB?

Connect to the ASUS RT-AX68U dual-band Wi-Fi 6 router even when you arenโ€™t home I know some of the differences between it and the more famous 5E3 . Beefing Up a Vintage Fender Vibrolux Reverb This month Iโ€™ve decided to forgo answering a questionโ€”not that I donโ€™t have plenty, and thank you for that, loyal readers The tone circuitry of most midโ€“ to late-โ€™60s Fender amps has an inherent midโ€“range dip, which is ideal for the classic Fender-clean sound, but small tweaks to the circuit values here can keep more of the mid .

The board apparently comprises a compressor, an old Boss OD-1 overdrive pedal, as well as a T-Rex Replica delay pedal

To reduce noise caused by AC powered heaters I employed two techniques: virtual center tap and DC heater reference I added SPST switch between OT secondary and 22K resistor which breaks that connection . Nudge Systems has created the next step in home automation and water conservation: the Pleco smart water watch All brown turds replaced with Sprague Orange Drops -- not necessary .

It was thought that power tubes introduced distortion, so Fender engineers looped an out-of-phase portion of the output signal back to the preamp section

The mod can also be used on the A triode pins 1 and 2 Descriptions of circuit and tonal differences between models and common flaws found in these amps . Pin 3 will be the point where negative feedback is injected Asking many guitarists and bassists what the difference between gain and volume is - or even just asking what gain is - is a little like asking people whose picture is on a $10 bill .

Add external bias test ports and a bias adjustment pot

The Elder Scrolls V: Skyrim was the first and only game to be included in the program, but the torrent of negative feedback directed at both Valve and the modding community prompted an abrupt gif You will find a cool schematic and info on the build also some more info on the Allen mod . It was characterized by its dual 6L6-family power tubes and single 15 speaker, with output power increasing from 18 watts up to 40 watts over its production run 'Fender' Tweed Deluxe 5e3 Negative Feedback Mod Demonstration - YouTube Just a quick run through the mod with various settings, currently wired as early reversible, will be secured to chassis so no .

Personally I found I can get a way better sounding Champ (overdriven AND at lower volumes) if you remove the negative feedback loop and make adjustments to things like the cathode bypass caps on all gain stages and some other mods so you don't have all that distortion to begin with

The presence control on the 1975 Fender Super Twin did not modify the negative feedback loop, but was an active equalization circuit, controlling the 3 - NEGATIVE FEEDBACK Resistor (820 Ohm in my Twin) - PHASE INVERTER tail resistor (33 KOhm in my Twin) - NEGATIVE FEEDBACK tail resistor (100 Ohm in my Twin) What I've understood from the 5F6A Fender Bassman circuit is that: - 100 Ohm resistor needs to be replaced by an RC arrangement . FENDER 1979 25TH Anniversary Stratocaster MOD / Silver - $2,001 A huge note to all!!! Fender Blues Junior needs 12 speaker with 8 Ohm output impedance, that can handle at least 15 Watts of power .

However, when the input signal goes through the amplifier stages, its phase might shift significantly, reaching in some cases a 180ยฐ phase-shift

It's hard to describe, but it will make it more like a tweed He just wanted a decent practice amp that was cheap to make . This is especially important in hi-fi amps to reduce THD (total harmonic distortion) and possibly other types of distortion as well The Mojo Vision Lens AR contact lens is truly a step into the future .

I have a guitar with humbuckers that would probably sound better with negative feedback

There is no negative feedback circuit used in this design Nothing comes free though as negative feedback inherently lowers the gain of the amplifier . There are lots of goodies here, so stay with me as I describe this The vintage channel (channel 2) is meant to be the typical Twin sound .

With no negative feedback, the output stage tends to overshoot and exaggerate the high midrange and sharp, percussive sounds

Hear your music even better with the Kanto S2 desktop speaker stands negative feedback takes away the dirt under your fingrnails, in other words, it cancels your personality . Find many great new & used options and get the best deals for Carbon Fiber Z71 Fender Emblem Number Inserts Chevrolet Silverado 1500 2500 3500 at the best online prices at eBay! Free shipping for many products! For those who donโ€™t know, the Fender Champion 600/Gretsch G5222 is a 5 watt, all tube combo using a 6โ€ณ speaker, wrapped up in a vintage style, late 40โ€™s early 50โ€™s cabinet .

Mercury trannies were installed to replace the stock OT and choke

Also note that this change was generally made to amps that use a simple 820 ohm resistor int he negative feedback loop The Fender Custom Vibrolux Reverb, or CVR, is a 2x10, 40 Watt all-tube combo amplifier in the tradition of Fender's most famous blackface amps . My impression is that modifying the amp to allow you to *reduce* the amount of negative feedback is what will give you more hair This is a simple to fit Treble Bleed kit/mod suitable for use for Fender Stratocaster or Telecaster guitars and their clones Any deserved NEGATIVE FEEDBACK, or a .

I also opted for ceramic tube sockets for the rectifier and power tubes, triode/pentode switch and bias test points for a slight additional fee

This resistor is connected to one end of the master volume com The Fender Super Champ X2 is a two in one, amplifier, combining the classic and trusted physical amp hardware with a modern digital software capability . It changes the amp from a one trick pony to a very versatile amp by giving you much more clean headroom at the flip of a switch so higher volume 'clean jazz' can be added to the 5E3's repertoire Double the size of the negative feedback resistoror triple it if you like where that takes the tone .

This a Mod Kit for installing a Negative Feedback switch for your Epi Valve Jr

Replace the 12AT7 PI tube with a 12AX7 or 12AU7 โ€“ Less clean headroom Fender designed the custom channel of this all-tube combo amp with a modified tone circuit that delivers greater tonal flexibility when used with your favorite effects pedals . The negative feedback loop can easily be tweaked to alter the treble cut and distortion in your amp This is a Plug in module which adds a master volume control to the Fender Hot Rod Deluxe and The Fender Blues Deluxe .

Only effect is a little reverb from my TC Electronic GForce

Seller: lucienne2020 (1,200) 100%, Location: Waterlooville, Hampshire, Ships to: Worldwide, Item: 183643550486 Fender Hot Rod Deluxe Master Volume Module Unleash the tone of your Fender Champion 600 with the Supreme Mod Kit from Fromel Electronics! The mod upgrades essential components in your circuit and tweaks the stock design to unlock the hidden potential of this amp . You can even go as far as adding a pot to adjust it from zero to full, but for me that's unnecessary He went on to say that he owned one and did the โ€œFormal Modsโ€ .

In a negativefeed back, the out put is sampled and fed back to input

this instuctable also regroup lots of information I will cover easy to hard mods, how to bias it properly, route wires to reduce, see reโ€ฆ Negative feedback loops tend to negate hiss and other unwanted noise . What you might also want to do is get rid of the 470k resistor from the plate to the grid of the third stage In some amps, this resistor is variable and is called the presence control .

Fender Champion 600 'Negative Feedback Mod' Kit An amplifier which has negative feedback built in is basically an amplifier with a limiter

Global negative feedback refers to the feeding back of a small amount of signal from a later part of the circuit to an earlier part, usually from a tap on the output transformer back to the phase inverter At first blush I was going to recommend not using this mod on the first stage of amplification because if the cap fails as a short it could inject high voltage into the . AnaMod LLC is the leading manufacturer of analog modeled audio products Hey, before you leave negative feedback because this is pointless, take some time to think how old this mod is, I released it 4 years ago about a day after the first LUA hook came out, and have decided to once again update it to work with newest patches .

In the process I spent hundreds of dollars but somehow the hiss problem got resolved

Hi and welcome to my listing for this mod CD for the Fender Champion 600 and Gretsch G5222 valve combos The Fender Pro was an instrument amplifier manufactured by Fender Electric Instruments from 1946 to 1965 . Funny thing is that it buzzes loudest from mid to high volume, decreases when the pot is turned to the loudest setting This is done by sending an out-of-phase signal into the phase inverter circuit, reducing its gain and, thereby, distortion .

If you're really into retrofit bridge mods I'd go for a Hipshot Type B, which to my ears really made a solid improvement to a few basses I installed it on

Attention ร  ne pas trop chauffer ou ร  ne pas dรฉgommer les pastilles du PCB en bougeant les soudures Feedback, suggestions and questions: Have something to say about these forums or a Nexus site or have an idea for a new feature? Let us know here . Negative feedback loop The negative feedback loop can easily be tweaked to alter the treble cut and distortion in yor amp Negative feedback controls the accuracy of the output stageโ€™s reaction to the signal sent to it by the prior stages in the amplifier .

This delivers an out of phase signal which reduces gain and cuts down distortion

Run each 120V lead from the power transformer to the switch and fuse respectively Say โ€œhelloโ€ with an instant message, voice or video call โ€“ all for free* . He also occasionally used Fender Jazzmasters on stage in 1967 and 1968 and in the studio for Tommy With too much negative feedback, the amp sounds slow and mellow; pick attack is muted .

After discharging the caps I simply desoldered the NFB wire from the speaker jack, then drilled a 1/4 hole next to the speaker jack in the bottom of the chassis for a small DPDT toggle switch

This mod is one of Cesar Diazโ€™ tricks in the Fender Custom Shop Vibroverb 64 which he always did to Stevieโ€™s amps I canโ€™t see it makes any difference! It sounds amazing - and all at bedroom volume . I also want to limit the mods to those that can be accomplished without being (or hiring) an EE Three-way negative feedback mod: adjustable negative feedback levels provide alternate system gain levels .

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2) I use the now-disconnected ground switch to switch the negative feedback loop in and out from the circuit, some like this, some do not If someone else wants to do the mod, these photos may help . I tried various mods over the years (actually making it worse and getting back to the origianal state later) and even had a tech install a negative feedback option They also reduced the amp's negative feedback to give it increased touch sensitivity, and it also starts to overdrive faster .

It has two channels, Normal and Bright, both with a high and low input

mod (NFL mod : Negative Feedback Loop) R41 R รฉsistance de 10K 2w ร  rajouter en l'air et R37 passรฉe ร  6,8k By making it switchable, you don't lose the stock 5e3 grit . Instead weโ€™ll explore a mod to a blackface Fender Vibrolux Reverb and the thinking behind it Its an inexpensive mod that allows you to control the sparkle of the overall sound .

You may want to google the following BASSMANHYPERON-1

It has the standard blackface power amp section, with the standard feedback loop You'll be given the components and a link to a detailed set of instructions sent too you through here . You can hear the change a bit better on the 6L6GC amps, such as the Pro Its much better than the 68CDRโ€™s Celestion 12-70W, and the โ€œFritzโ€ (brings both chans thru verb/trem and extra half stage pream, mod Clean channel Marshal tone stack, and 50% reduced negative feedback .

Lead Channel Mod Do something constructive with your unused Normal channel

Negative feedback circuits in guitar amps are very simple and typically consist of a single resistor Most Fender push-pull amplifier designs use negative feedback, tapped from the output transformer speaker winding to enable more headroom before power stage distortion starts . So now I have a Trainwreck-ish channel (bass) and a pure Fender channel (normal) with 3 gain stages Please don't open case or leave Neutral or Negative feedback (including .

Volume loads the output from the 1k R9 down to ground & at the same time reducing gain by increasing the Rin value via R5

However they do sound different than the vintage Fenders they are supposed to emulate As far as hooking up the new power cord, hook your black lead onto the switch (on/off) and the white lead to the fuse block . Fender ยฎ 70's Stratocaster RI Vintage Loaded Pickguard Taken from a 2003 Fender 70's Stratocaster RI*Loaded Pickguard Includes: White 3 ply pickguard w/vintage back plate-3 Fender Vintage Alnico Pickups-3 CTS 250k Pots Fender Deville Amp Chassis with Fromel Supreme Kit Mod Fender Deville Amp Reverb Tank Both For Parts or Repair ONLY Included: Power tube set for Fender Deville 410 This will be a Great Deal for someone who knows how to work on amps .

This is often due to using negative feedback around the power amp, which the second of two mods in this excursion

Designed with encrypted data-tunneling VPN technology, you can take your home network with you, so you donโ€™t That means they have excessive background hiss and limited clean headroom . Fender Custom Vibrolux Reverb Mods? General discussion area for tube amps It has been upgraded with roller string trees, Gilmour switch mod and carbon wrap pickguard .

You'll gain volume, treble and it will be a lot more dynamic

Seller: string-switch-noise (1,154) 100%, Location: Brisbane, Ships to: Worldwide, Item: 224265244969 Fender Telecaster Custom (Deluxe Mod), โ€˜72, Natural Ash, 1997, Hard Case The purpose of the NBF loop is to clean up the tone and cancel out the mid/higher frequencies and upper harmonics (distortion) at the entry point of the phase inverter which is placed in front of the power tubes . I take pride and care with manufacturing my products and will do what ever I can to resolve issues promptly The NFB loop was modded to reduce the amount of negative feedback .

The last resistor is usually a small value, such as 5K (Marshall) or 100 ohms (Fender), and is the shunt element of the feedback voltage divider for the global negative feedback loop (pot VR1 in the above schematic)

Negative feedback is widely used in mechanical and electronic engineering, but it also occurs naturally within living organisms, and can be seen in many other fields from chemistry and economics to physical systems such as the climate ) lecture from Electronics course, by Indian Institute of Technology Delhi . There are a few differences under the hood, other than the aesthetics: - Reverb and tremolo on both channels - a modified Bassman tone stack on the Custom channel - quicker gain onset - reduced negative feedback for greater touch sensitivity - different Additionally, this rearchitected design ensures that new technology works .

820ohm and 100ohm on the negative feedback (AA864)

You must remove (or just clip a leg of) the original 820 ohm negative feedback resistor then connect the 3-way switch to the top and bottom resistor eyelets/turrets It features two 5881 power tubes, a tube vibrato circuit, and tube-driven reverb . The bass channel adds a gain stage and a different sort of tone stack which is similar to what Fender did with the 6G6, 6G6-A, and 6G6-B versions of the The 360 Reality Audio allows it to produce ambient .

Mod-04 Lec-18 Input/Output impedances in negative feedback amplifiers (Contd

I see on the site 300Guitars there are some mods where they have removed R7 to take the feedback out my favorite mod for getting the results you describe is to make the negative feedback loop switchable, routing it through the disabled ground switch . Contact me before leaving netural or negative feedback to resolve any issues The edge of breakup is also a lot more gradual and natural without the negative feedback .

Like most amplifier negative feedback loops this mod will reduce distortion, tighten the transition from clean to dirt and slightly reduce gain

Negative Feedback Mod Many amps have a negative feedback loop to increase headroom (reduce overdrive), flatten frequency response and maintain better control of bass frequencies In fact, it can also display the calendar and weather as well as the . โ€“ Modify the negative feedback loop from the AB165-design to the AA864/standad Fender NBF design Fender removal recommended to ensure correct fitment .

Gain attenuates negative feedback - progressively diverting the output signal away from the inverting input

A simple, easily reversible mod for these UL amps is to disable the negative feedback loop Its design was largely based on the Fender Bassman, one of the worldโ€™s great guitar amps (a bit of an irony!), but the JTM 45 had a bit more grit and top end brightness to the tone, thanks to use of more negative feedback (i . Great Build Quality with a wide choice of Speakers and Cabinet Finish/Colours His mods include a Hot mod for Marshall-type voicing and gain, a tweed-style mod and negative feedback resistor mods to change the dynamics of the power amp stage .

Tilting your speakers vertically at an angle of 16 degrees, this pair of stands makes your audio come through

Negative Feedback - Mods Please Review Thread in 'The Help Forum' started by AC-130 Above, Nov 28, 2020 1uf supply decoupling caps with 10uf 450v electrolytic caps . The long-tailed-pair phase inverter with negative feedback was used by Leo Fender in the 5F6-A Bassman and subsequently became an overwhelming favorite for classic large amp designs, Marshalls in particular Using the AnaMod Process, Anamod has created the ATS-1 tape simulator and the AM660 compressor .

The โ€˜Verb has a 100pF shunting cap, C20, across the PI plates

Author Topic: Fender Blackface mods (Read 3193 times) 0 Members and 1 Guest are viewing this topic Reverb was removed from the Normal channel and the reverb recovery capacitor value was changed to give more reverb . Switched Negative Feedback This is my favorite mod for the 5E3 Examples that do include Fender, Marshall and Boogies .

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The biggest negative for both the 68 and 65 reverbs is that Fender still hasnโ€™t fixed the loud โ€œPOPโ€ when standby is activated And being a negative feedback amplifier to calculate gain just needs to equal Vin+ and Vin-, I'm not going to make all the calculations, but it will be calculated in the same way on TDA1514 than on LM3886, I think I'm sure about that . The normal channel looks and sounds like the normal channel on other blackface amps (relatively speaking) Fender Tweed Deluxe 5e3 Negative Feedback Mod Demonstration - Duration: 8:44 .

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Add a 3-position negative feedback selector switch The 5B3 has a 6SC7 preamp tube and the same for phase invertor . Keep the reverb tank because it's an American made Accutronics Be sure to check out the Mods for Most Amps section for even more options .

I'm digging up this thread to add some photos of the mod suggested by JM Fahey in post #10

A signal from a tap in the output transformer secondary drives the feedback input to the phase inverter to counteract the amplified signal In 2006 Townshend had a pedalboard designed by long-time gear guru Pete Cornish . It changes the negative feedback in the low end of the spectrum At the same node as the diodes, there are 3 different tone selective paths that are presented to the amp's output .

3-Way Negative Feedback Switch This is my favorite and most useful 5F6A mod, a three-way SPDT ON/OFF/ON mini-switch gives you: Normal 27k (2 ohm tap) feedback resistor / No Feedback / JTM45 equivalent 10k feedback

the mods include the following sections, of which any or all may be completed: 1 Incidentally the new Gretsch G5222 amp is electronically th e same as the new Fender Champion 600 so these mods will work for that amp too . This is accomplished by mixing in a voltage to a signal path that is out of phase with the primary signal An amplifier which has negative feedback built in is basically an amplifier with a limiter .

Iโ€™m working on a near-total overhaul of a 70โ€™s Bassman 50

I've got a Fender Champ 5F1 guitar amp that has a crispy 22k ohm resistor on the speaker jack By default, Fender puts specially designed Eminence speaker in standard edition of Fender Blues Junior . Negative feedback can be part of this circuit, as well as a presence control โ€ข Video calls โ€“ Donโ€™t just hear the cheers, see them! Get together with 1 or 24 .

While looking at some more info on negative feedback, I also found some info on the presence control found in some Fender amps

This electric bike has a triple-barrier antitheft system that includes biometric access, integrated electric locks, theft detection Fender Silverface Champ Tone Stack Bypass/Negative feedback mod - Duration: 13:08 . Be sure to check out the Mods for Most Amps section for even more options And then the negative feedback loop is going from the 5B3 regardless of other mods .

Seller: cosmic121 (432) 100%, Location: Nottinghamshire , Ships to: GB, Item: 124524302806 Fender Squier Stratocaster With Gilmour Mod & Upgrades Full Width Fret Set-Up

-Alter or disconnect the negative feedback circuit in the Champ It had the ability to both amplify (boost) and attenuate (cut), unlike the earlier presence control . 1 Volume and 2 Tone-OaksGrigsby 5-way Switch-IC Polyester Film Capacitor Moderators: pompeiisneaks, will help a little as will negative feedback, but ditching .

Iโ€™ll try to disconnect any Negative Feedback Circuit in the Pjr, but I donโ€™t really want to dive into the complexity and expense of slinging a soldering iron all over it, unless the mods are REALLY simple

Originally they were equipped with Eminence alnico blue frame speakers which blew constantly The amount of feedback determines how much each of the above attributes are improved . It provides negative feedback which most agree does not sound good Use Skype to send SMS messages to mobiles worldwide and with SMS Connect you can now also read and reply to your phone's SMS messages right from your computer .

ever wondewr why every body sounds the same with a strat/fender? i mean, of course there is a little variation because of tyhe git and player, but the amp sounds the email protected controls, or cancels, if y

I did a few mods to this amp, most notably added a mid knob on the back panel Removing the external speaker output is the first step in making a Fender amp's negative feedback loop variable . Negative Feedback Loops and the Fender Presence Control - Duration: 9:04 seems simple enough and there appears to be a lot of folks out there that like the results .

By contrast, the typical for individual tube and transistor gain stages can be much higher at nominal (0

The positive terminal of the speaker output is connected to the cathode of the/a preamp valve Mods include a re-voiced preamp, reduced negative feedback, and a Celestion speaker . Cathodyne or split load The split load or cathodyne phase inverter only uses one tube stage, and has unity (or less) i have a 1965 Fender bassman AB165 model, and after reading entirely too much on the internet about these amps .

This mod is one of Cesar Diaz' tricks in the Fender Custom Shop Vibroverb 64 which he always did to Stevie's amps

Custom Vibrolux Reverb Mods โ€ข Negative Feedback Loop These amps don't have a negative feedback circuit The amp now buzzes a lot, varies with the loudness pot . Many guitar amps employ negative feedback although some do not At the output of this amp is a pair of 1N4001 silicon diodes that connect back to the input of the fuzz amp .

It was a bit inconvenient having the switches under the chassis but I didn't want to change the faceplate and it was a much shorter run for the wiring

Seller: rodgerk1977 (833) 100%, Location: andover, Ships to: GB, Item: 184579120039 Fender Squier Affinity Stratocaster With Gilmour Mod 1uF cap and 47KOhm resistor in the feedback loop and replace with a 820 ohm resistor (which you can make switchable by using the ground switch) . The purple wire soldered to the speaker jack is a negative feedback to give the amp more gritty volume This completes a clipping negative feedback loop popularly used in pedals like Big Muffs and Tubescreamers .

This kind of bothers me as Fender Musical Instruments, Co

knows this amp is faulty yet they have not offered any kind of โ€œrecallโ€ or offering to make the amp right โ€“ Remove the 220k feedback resistors from each of the plates on the two 6L6 tubes . This is a fun little amp to modify and a great place to start if youโ€™ve never done anything like this Plexi Mod, Negative Feedback Mod, Mercury Magnetics Output Transformer installed .

The only one I really liked was the bypassed position

As for the Bass Channel I just basically modified the tone stack to Usually, higher powered amps have negative feedback, and lower powered tend not to, but this design choice goes all the way back to Leo, and everyone else has been copying ever since . Speaker Tap and Feedback Levels for the 5F6A, JTM45 and Similar Amps Moderate is 41% more feedback than Light Negative feedback loop The negative feedback loop can easily be tweaked to alter the treble cut and distortion in your amp .

The โ€˜68 Custom range has significantly reduced negative feedback, seemingly without rendering it at all noisy

Negative feedback also affects how the amp responds as it transitions into overdrive The long-tailed-pair phase inverter with negative feedback from the output transformer is one of the most ubiquitous architectures in guitar amplifier electronics . A brief history of the Fender Tweed Deluxe models for 1946 to 1960 3) Remove the 2uf cap from pin 3 of the 12AX7 to gnd .

A true Master Volume control reduces power amp sensitivity so that ONE key tube in the preamp chain can be driven harder in a way that is more musically complimentary and generating the more subtle even-order harmonics (octaves)

Add Negative Feedback Loop (for a more traditional Fender sound, and less hiss), 5 047 now that the channel has more gain from mod #1 . Fender Tweed Deluxe 5e3 Negative Feedback Mod Demonstration - YouTube Just a quick run through the mod with various settings, currently wired as early reversible, will be secured to chassis so no I also own an Fender Custom Vibrolux that is famous for hiss problems .

For the next few years, many models received mods to the current circuits, and in some cases totally new circuits

The 'No Feedback' position makes the amp break up early kind of like a 5E3 Deluxe Regardless of the method chosen, its purpose is to reduce the gain of a circuit in order to prevent distortion . The feedback voltage applied to the phase inverter is the resultant divided-down version of the output voltage I am partly removing feedback loop (by shunting instead of disconnecting) as part of the Presence Plus mod .

But feedback design can consume an entire textbook and if designed poorly will create exactly the sound you describe

In this circuit, negative feedback does a lot and when you disconnect/partially disconnect with a pot or switch, it really opens the response and comes to life! It has stood the test of time and been been done by players in 50 years in blackface Fender amps . There's no denying the allure of a roasted maple neck NFB/no NFB is a topology choice in voicing an amp .

. 047uF 400v+ cap connect the preamp grid and plate together to form a local negative feedback loop You can use the bright switch to flip between the mod and the stock circuit

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