[Hallicrafters] HT-32 PTT and CW break-in mods?

[Peter Bertini]

Hello  Yes, I did find  that webpage in my searches.  My
only caveat would be the concerns raised by W8JI
http://www.w8ji.com/power_transformer_stress.htm
I would further suggest adding a few power resistors
in series with the diode cathodes to reduce the peak
surge charging current. One other possibility would
be to wire the now vacated 5-volt filament windings
in series with the primary winding to reduce the turns
ratio and further reduce transformer stress.

pete k1zjh

On Sun, Jul 18, 2010 at 1:22 PM, Al Parker <anchor at ec.rr.com> wrote:

> hI agn Peter et al,
>        I forgot (common thing nowadays), that article from a May 64 issue
> of 73 mag is on my website, take a look at <
> http://www.boatanchors.org/HT37.htm> down at the bottom of the page.
>        You also should be interested in the section on "solid stating the
> HT-37" (the HT-32 & -37 are essentially the same xmtr except for the method
> of sideband generation).  It is advisable to remove the 5v filament windings
> of the power transformer from the circuit by going solid state at the
> rectifiers.  A common failure mode of the HT-32/-37 is for the HV winding of
> the xfmr to short to the 5v filament winding, or/and to ground, thus
> trashing the xfmr  It's a simple change which can save you future anguish.
>
> 73,
>
> Al, W8UT
> www.boatanchors.org
> www.hammarlund.info
>
> "There is nothing -- absolutely nothing -- half so much
> worth doing as simply messing about in boats"
> Ratty, to Mole
>
> On 7/18/2010 12:51 PM, Peter Bertini wrote:
>
>>  Hello to the group
>>
>> I just traded for an early SX-32 transmitter, and I'm going
>> cross-eyed trying to following the relay keying circuit through
>> the maze of operating and function switch contacts.
>>
>> So, to make my life easier--is there a good source for
>> modifications to allow for VOX operated CW keying and
>> changeover,  as well as a means to add manual PTT
>> that also disables the VOX feature?
>>
>> Pete
>> ______________________________________________________________
>> Hallicrafters mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/hallicrafters
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Hallicrafters at mailman.qth.net
>>
>> List Administrator: Duane Fischer, W8DBF
>> ** For Assistance: dfischer at usol.com **
>>
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>>