[Hallicrafters] HT-32 PTT and runaway in finals

[Steven Grant W4IIV]

The PTT mod sounds fine...i use it and it works fine (i had to disable the MOX function tho)
As for the tubes, the way i fixed it was to add a relay to add a high bias voltage (-120) to the finals this voltage is found before the adjustment
Also this new relay, if multiple section, can be used for antenna change over, muting, and amp switching (i do that anyways)
Also another cool mod is to use an always on transformer for the VFO tube. That and a christmas bulb (C-6) to heat the vfo (on the bottom) makes it rock solid
good luck
          STEVEN GRANT  W4IIV 
 
 psturdivant n1ps <sturdivant at adelphia.net> wrote:I'm back to the list after a month or so after changing email.

Hello again.

Anyway, I'm getting ready to get my HT-32 on the air, mostly as an AM set.
I'm considering adding remote PTT so I don't wear out the Operation Switch.
Has anyone tried this? I noted the PTT relay control, V17B, is enabled
with a contact closure to ground. This could be mimicked via a remote PTT
switch like a pedal, after reviewing the prints..

Has anyone tried that?

Also, the finals on this set occasionally go into harmonic runaway. I'm
replacing the finals when some new ones come in. Then I'll neutralize the
finals....

Has anyone seen a similar situation? This xmitter uses plain 6146 pentodes
(and I'm staying with the same tube...not the A or B).

TNX

Pete
n1ps

_______________________________________________
List Administrator: Duane Fischer, W8DBF **for assistance**
dfischer at usol.com
----
Hallicrafters Collectors International: http://www.w9wze.org
----
http://mailman.qth.net/mailman/listinfo/hallicrafters


STEVEN GRANT    W4IIV



---------------------------------
Do you Yahoo!?
Yahoo! Mail Plus - Powerful. Affordable. Sign up now

--- StripMime Report -- processed MIME parts ---
multipart/alternative
  text/plain (text body -- kept)
  text/html
The reason this message is shown is because the post was in HTML
or had an attachment. Attachments are not allowed.
Please post in Plain-Text only.---