----- Original Message -----
From: "TC Dailey" <[email protected]>
To: <[email protected]>
Sent: Thursday, January 27, 2011 2:58 PM
Subject: Re: [Drakelist] Drakelist Digest, Vol 31, Issue 45
Speaking of the AC-4 - Anybody used one of the "upgrade"
boards on a NON STANDARD AC-4?
Story I get is that there are different versions of them,
and the "inventor" refuses to supply adequate information
on the various versions - I got the thing in, but it was
no Heathkit - rather an "invent it as you go" sort of
thing.
Tom - Denver
By "inventor" do you mean the Heathkit Shop kit or the
AC-4? If the upgrade kit I found that assembling the board
was a breeze and the instructions for that part reasonably
good. However when installing the thing I found the wiring
in my AC-4 was not as described in the kit instruction. I
was able to figure out what to do but I think the
insructions left a lot to be desired. Too much effort on
warning about HV and not enough on procedure and either
drawings of pictures. All that said the kit works fine and
is probably a good idea since it uses currently available
parts and not special can capacitors although the latter are
probably available on special order.
BTW, the bias circuit is exactly the same as the
original, no additional protection in case it fails.
Probably that would require some sort of fairly rapidly
acting crow-bar on the HV and screens or at least the screen
voltage to shut down the final in the event of bias failure.
I suspect this would not be difficult to do these days but
probably overkill for this rig.
--
Richard Knoppow
Los Angeles
WB6KBL
[email protected]
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