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Date Posted by Category User IP

2016-11-09 (UTC)

W3AVE

Antiques

pool-71-191-132-195.washdc.fios.verizon.net

Heathkit AT-1 transmitter

Heath’s first transmitter, a 6AG7
running into a 6L6 final. Looks
good but untested. No indications
of damage or abuse in the form of
tar puddles, electrolytic leakage
or burns. Very decent soldering and
other workmanship.

Front panel very clean. All
original knobs and meter. One small
front-panel screw is missing.
Cabinet shows specks of bare metal
but no dents or rust. The line cord
is intact and looks to be original.

The transmitter was modified at
some point by adding OD3/VR150 and
OA2/VR105 voltage regulators and
associated circuitry. The OD3 is
tied directly to the 6AG7 screen
and was obviously added to
stabilize the screen voltage. The
OA2 may be a source of regulated B+
for a neon bulb relaxation
oscillator for a sidetone generator
or maybe just a CPO—I didn’t trace
out all of the additional
components.

The single crystal socket on the
front was changed to an octal
socket, and a ¼” phone jack, where
I believe the sidetone or CPO
output is available, was added.

I will include a decent printout of
the manual (minus the step-by-step
pages, which are not included in
the free downloads I found), plus a
couple of other informational
items.

Tubes have been removed, boxed, and
taped in place.

I will be glad to send more photos
on request.

$50 plus shipping from zip 20854.
Pickup welcome. Payment by check,
MO or PayPal (with fee paid) all
okay.

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