[Hallicrafters] HT-32 PTT and runaway in finals

[Al Parker]

Hi Peter,
    Yes, the PTT mod is a simple one, I've got an emailable copy of the
details if you'd like.
    And you oughta neutralize it now b4 you lose the finals, or worse.
Think abt going SS on the rectifiers to reduce heat in the pwr xfmr, which
is a fragile one.
73,
Al, W8UT
New Bern, NC
BoatAnchors appreciated here
http://www.thecompendium.net/radio/
http://www.hammarlund.info

----- Original Message -----
From: "psturdivant n1ps" <sturdivant at adelphia.net>
To: "Hallicrafters List" <hallicrafters at mailman.qth.net>
Sent: Sunday, December 22, 2002 5:17 PM
Subject: [Hallicrafters] HT-32 PTT and runaway in finals


> 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
>
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