From: Garey Barrell 
Subject: Re: [drakelist] AC-4 Cap values


Garey Barrell  made an utterence to the drakelist gang
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Carl -

AC-4 had 20/20 on the bias supply for years.  Late production started 
using 40/40's.  Never had any problems with the 20/20's, possibly the 
40/40 became more available.

The AC-4 parts list dated Oct 1, 1976 shows the 40/40 also.   The AC-4 
was introduced in 68 or 69.

Your 33/33 should be fine.

73, Garey - K4OAH
Atlanta

Drake C-Line Service Manual
http://hr99.home.mindspring.com/R-4C_Servicez/>



Carl Strode wrote:

>
> Carl Strode  made an utterence to the drakelist 
> gang
> ----------------------------------------------------------------------
> I am about to re-cap one of my AC-4s.
>
> Looking at several schematics, I note that C5a and C5b are shown as 20 
> microfarads.
>
> I have a parts list dated September 1, 1974 that shows both C5s as 40 
> microfarads.
>
> Looking at the AC-4 I see that indeed there are 40 mic caps installed.
>
> What is the scoop here??
>
> Also, I have found a bunch of new electrolytics of larger values that 
> I am planning to use.    I will replace an old 125 with a new 150  
> This is OK, right?
>
> What really has me puzzled is the 20 vs 40 mic caps.  I was planning 
> on using some 33 mic caps I have on hand.
>
> By the way, all of my new caps are 400-450 volt ratings.
>
> Please advise.
>
> Carl
> WA7CS
> R4B, T4XB
>
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