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FDP Forum / Fender Amps: Vintage (before 1985) / GLOSSY BROWN FENDER CAPS IN FENDER AMPS

telefender

canada

fender50
Sep 27th, 2018 06:51 PM   Edit   Profile  

Just noted that my bandmaster reverb has these flat brown chocolate colored capacitors..... I have a fistful of the same value caps that are the glossy style ones..... they all tested good.
Would I be smart to replace the old brown (turd like ) caps with the glossy looking ones....or are they both of the same origin but have a different finish to them. The flat brown are like lumps of coal ...whereas the other glossy ones area shaped and look like the orange drop style caps ? Need some advice before I tear this 71 Bandmaster apart ...thnks

BbendFender
Contributing Member
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American Patriot

About as ordinary as you can get.
Sep 28th, 2018 01:47 PM   Edit   Profile  

Save the old caps but I think it would be ok to replace the old brown caps, if they are out of tolerance.

Hammond101
Contributing Member
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So. Cal. USA

Sep 28th, 2018 02:37 PM   Edit   Profile  

My concern would be why? If good, yes they will work. If the caps that are in the amp are up to spec there is no need to swap them. Blue molded, brown turd, blue blob...electrons don't care. They are color blind.

Change these parts only if they have failed. Coupling and tone caps can live longer than humans in many cases. The brown and blue (blob and turd) caps seem to live huge lives.

Peegoo
Contributing Member
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As old as the sun

with white teeth
Sep 28th, 2018 02:45 PM   Edit   Profile  

Good point. If the current ones are in spec, they're working fine.

And if/when a coupling or tone cap fails, it doesn't take out other components like the large filter caps in the power supply sometimes do when they quit.

telefender

canada

fender50
Sep 28th, 2018 03:38 PM   Edit   Profile  

Good point..... I have perhaps read too many strings where the old chocolate caps were of lower quality and didn't produce the same sounds and tone as the molded blue caps and the orange drop caps do....perhaps all hear say! Get the pun
"hear" say its good or better ...depends on who is doing the saying !! Will test the old ones first to see if they are in range ....and only swap any that are drifted too far .

thanks again ....good to hear from the experts !

Leftee
Contributing Member
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VA

Sep 28th, 2018 06:57 PM   Edit   Profile  

Great tone happens.

telefender

canada

fender50
Oct 10th, 2018 08:31 AM   Edit   Profile  

Hi All Fender lovers.....picked up a 72 Super Six Reverb and am redoing caps and some resistors...final ending is with the bias setting.. does anyone know what the bias setting on this 72 SuperSix Reverb should be ?? have the schematic but don't see it anywhere .... Help with this would be appreciated ......

thnks

Hammond101
Contributing Member
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So. Cal. USA

Oct 10th, 2018 10:08 AM   Edit   Profile  

Your current draw setting is going to depend on the measured plate voltage in the amp. Take a look at the Weber bias table linked below for 6L6GC power tubes.

That amp if it really is a '72 is most likely built to the AA270 Twin Reverb circuit. This amp has fixed bias with bias balance. This means if a bias adjustment other than balance is needed bias resistor values must be changed.

I typically convert these to fixed adjustable bias as in the black faced amps.

Edit to add:
I usually set up the entire power section including phase inverter as in the BF amps.

Weber Bias Tables

(This message was last edited by Hammond101 at 12:19 PM, Oct 10th, 2018)

Silverface

Lawndale CA

No Chops but Great Tone ©
Oct 14th, 2018 05:15 PM   Edit   Profile  

The "brown turds" sometimes drift or develop electronic (not physical ) leakage but the "bad tone rumors are just that. If they are working fine leave them alone. If anything the new glossy-brown poly caps may be a step down.

If the "turds" are a bit off spec I pull them, but I save the .1 and .047, for use as wFender Tele & Strat tone control caps. The actual uf isn't critical, they don't affect the "tone" at all since they are passive - but I tend to like the smooth treble rolloff "slope" they have.. They'e usually quite linear and a re a big step up from ceramic discs and other cheapo caps.

FDP Forum / Fender Amps: Vintage (before 1985) / GLOSSY BROWN FENDER CAPS IN FENDER AMPS




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