Heath A9 amplifiers

[Chris Campbell]

I just mailed a copy of the A-9B schematic out (Heath sent it to me
years ago).   I compared it to a fuzzy print of the A-9C schematic from
the internet.  There was a voltage divider or something in the power
supply of the -C that was not there on the -B.  I have not pulled my -A
model from strorage to see what it has.  But that P.S. change was the
only one I spotted.  There must be others.

Chris Campbell

Fred wrote:

>I normally am interested in Heath Ham gear but the postings on the A9 series amplifiers made me pull one I have out.  What are the differences between the A,B, and C versions.  I thought I remembered a version with a gold chassis the same color as the W5.  I found an original book for the A9C and it shows one of the filter caps in series with bleeder resistors across them.  The one I have doesn't use this setup and looks totally original underneath.
>I found the one I own has had a pilot lamp mounted through the center chassis hole which was normally covered with the control plate #205-M20F161.  Unfortunately, the model number of the amp on the plate was damaged when someone drilled a hole through it so I am not sure which version I have.  Mine has a grey chassis.  This brings me back to the question: Would anyone on this list have a control plate they would like to sell?
>
>Thanks,
>
>Fred
>WA3KIO
>
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Products bought, sold or traded here is the responsibility of the
parties involved.  This list and the City of Tempe are not responsible
for losses or misrepresentations of any kind.  Buyer beware!

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