[Heathkit] SB-300 versus SB-301 differences

[Bob Macklin]

Heathkit users need a copy of Chuck Penson's Heathkit book!

In the case of the SB-300 and SB-301 it describes the differences.

Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"
----- Original Message ----- 
From: "jack m" <oldvette at hotmail.com>
To: <heathkit at mailman.qth.net>
Sent: Friday, June 14, 2013 8:48 AM
Subject: [Heathkit] SB-300 versus SB-301 differences


> Hi group,
>
> I want to replace a bubba-damaged RF Osc board in my SB-301 due to a 
> previous socket replacement attempt gone ugly.  Currently, there is a used 
> board in nice condition up on EBay for an SB-300.  The board number is 
> given as 85-72F947 as silkscreened on the top.  I give everyone permission 
> to search for this, but NOT permission to buy it out from under me yet, of 
> course!
>
> I do not have a schematic of the SB-300 or x-ray page for comparison with 
> my '301 manual.  Further research shows that these appear identical 
> physically, from the top, but no underside trace photo is available for a 
> tedious comparison.  The part number silkscreened on the SB-301 is simply 
> 85-72.  Knowing the obvious upgrades for the '301, my gut feel is that the 
> boards are the same, but I'd like other opinions.  Before I buy it, Is 
> anyone aware of a difference in applicable circuitry between these two 
> models?
>
> Would anyone have a later '301 osc board in nice condx from a parts rig 
> available for sale?
>
> Thanks
>
> Jack
>
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