From: Garey Barrell 
Subject: Re: [drakelist] R-4B question


Tim -

Oops, sorry.  V13 was the AVC amp, not audio.  The diodes in 
the 12AV6 weren't used.

73, Garey - K4OAH
Atlanta

Tim -

Not quite...  The two tubes dropped from the "early" R-4A
were V6, the 6GX6 Product Detector, and V13, the AM detector
and first audio amp.  The VR tube stayed on until the second
version of the R-4B.

73, Garey - K4OAH
Atlanta

Tim Kass wrote:

> 
> My R4B does NOT have the OB2, Drake removed that in the later R4A 
> series, early R4A had the OB2 and 6GX6 product detector, but the 11 tube 
> version of the R4A did away with it...73  Tim  K8WBL
> 
> 

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