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FDP Forum / Fender Amps: Vintage (before 1985) / Carbon Film Resistor?


USA / Sesame St.

May 2nd, 2017 02:32 PM   Edit   Profile  

Would you use a Carbon Film Resistor for the 10M in a Blackface circuit?

I'm asking because I read this, consider using Carbon film resistors in non signal voltage divider circuits only.

(This message was last edited by roadhog96 at 08:03 PM, May 2nd, 2017)

Contributing Member

The spotlight

looks like a prison break
May 2nd, 2017 06:36 PM   Edit   Profile  

I am no expert, but the way I understand the logic is that carbon film resistors are prone to shot noise--and that makes them not the best choice for use in a signal path.


Cincinnati, USA

May 3rd, 2017 11:45 AM   Edit   Profile  

I'm getting old.

Couldn't quite place where in the circuit I would find a 10M. So I looked at the AB763 schematic of a Super Reverb.

Still couldn't find a 10M.

So IMO, use whatever you have in stock and don't worry about.

Steve Dallman
Contributing Member

Merrill, Wisconsin

Age is just a number...mine is big
May 3rd, 2017 12:13 PM   Edit   Profile  

No 10M in a Fender that I know of. There are in some old Magnatones.


USA / Sesame St.

May 3rd, 2017 08:21 PM   Edit   Profile  

Are you guys messing with me? My eyes aren't as good as they use to be but I can still read a schematic with the help of glasses and I'm seeing a 10M in the Tremelo Circuit on a AB763. Check out the link.

AB763 Tremelo Circuit 10M Resistor

(This message was last edited by roadhog96 at 09:57 AM, May 4th, 2017)


Cincinnati, USA

May 4th, 2017 07:06 AM   Edit   Profile  

Oh, that 10M resistor...

It's not in the signal path, use any resistor there. 1/2 watt carbon film, whatever.

I wouldn't bother changing it unless it was more than 20% out of tolerance.

Steve Dallman
Contributing Member

Merrill, Wisconsin

Age is just a number...mine is big
May 4th, 2017 07:27 AM   Edit   Profile  

Sorry, I retired from the bench over 10 years ago, and my memory has been damaged by a slow progressing dementia. I should have refreshed my memory by actually looking at a schematic.


USA / Sesame St.

May 4th, 2017 08:03 AM   Edit   Profile  

Dementia is a common condition that comes with aging and it's frustrating as all heck not being able to remember things. It only happens to me when I can't remember something, the rest of the time I'm good I think, I can't remember. LOL

(This message was last edited by roadhog96 at 12:22 PM, May 4th, 2017)

FDP Forum / Fender Amps: Vintage (before 1985) / Carbon Film Resistor?

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