Re: When to replace resistors on vintage amps?

I generally start thinking about replacing resistors when they are
beyond 20% out of spec. - electrolytics I check for ESR - and tone
caps I usually leave alone unless there is some DC problem or I find
one or more with problems. Then I will frequently check others to
make sure the problem isn't with all the caps. I had a Univox that
had a bunch of bad Atlas oil caps in it - wound up changing all the
caps. Sounded fantastic afterwards.

Thorny

On Tue, 23 Aug 2005 15:46:47 -0400, Justin wrote:

>Okay, this question has been bugging me for awhile, and I'd your
>opinions. I've been restoring a few new acquisitions this week ('65
>Deluxe Reverb, '70 Princeton, '77 Super Reverb, '79 Champ) and as I
>test my way through the Princeton and DR circuits I notice most of the
>resistors read an average of 10% higher than they need to. Sounds
>reasonable since their resistance increases as they age, and according
>to my schematics, 10% is within specification for the circuits. My
>question is: What is the overall effect of this overage versus a stock
>value amp? The DR and Princeton both sound great as is, but I'm curious
>at what point (if any) does it become worthwile to start replacing
>drifting resistors?
>
>Justin,
>
>
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