[Jukebox-list] RE: Seeburg Stereo Tube Amps

[Bob Ellingson]

At 09:25 AM 8/21/2007 -0400, you wrote:
> 
>
>Can anyone tell me if there is any significant difference between the
>Seeburg SHFA 4 (of the AY) and the SHFA 5 (of the DS)? 
>
>I've got a DS160 in which someone has substituted the SHFA 4 amp. Before
>I go rebuilding it, I want to make certain that it is an acceptable amp
>for this box. 

I can't get at my documents right now, but I recently rebuilt a SHFA5
amp after having done my SHFA4, so I was comparing schematics (I have 
both an AY and a DS).  I seem to recall that there were a couple of
resistors that had been changed to different values, and maybe a 
capacitor, and there was a wiring change in the tone circuitry where
a series capacitor/resistor combination was "flipped" so that the
resistor was the last element connected to ground in one of them, and
the capacitor was the last element of the pair connected to ground in
the other.  When I get my game room put back together after hauling eleven
pinball games to the show a couple weekends back, then I can get to my
notes for verification.

Not really anything major in the way of changes, and as Ron says, the
major difference is the connector for the "ear" speakers.

--Bob
=======================================================================
Bob Ellingson					bobe at halted.com
Halted Specialties Co., Inc.			http://www.halted.com
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