[Hallicrafters] Hallicrafters HT-33A

[Glen Zook]

The high voltage would be a "killer" using 8122 or 8072 tubes.  I have a line on an 8295A tube and hope that it is still available.  That way no changes will have to be made.  I still am going to change out the 3B28 tubes for solid-state.  I have appropriate diodes in stock so that will not involve any expense.

Of course the 2000 watt PEP "rule" was "unofficial".  Everyone just "assumed" that a peak of 2000 watts on SSB represented the official 1000 watt limit.  The FCC didn't really care so everyone went with that figure for SSB.

By the way, does anyone have a photo of the bottom plate on the HT-33A or HT-33B?  Mine is missing that plate.  It won't be any problem to fabricate a new one but seeing what the original looks like would be a help.

Glen, K9STH

Website:  http://k9sth.com


--- On Fri, 9/19/08, Carl <km1h at jeremy.mv.com> wrote:

From: Carl <km1h at jeremy.mv.com>

Here is a 4CX1000A conversion, the 4CX1500B is almost identical. A stock 33B is shown for comparison.
 
http://www.hollowstate.ca/HT33B.html

http://www.isquare.com/personal_pages/ht33b.htm
 
The FCC 2000W PEP SSB rule was in effect when the B model was out and Id suspect that it was capable of meeting or exceeding that. Unfortunately I do not have a manual or an ad handy to confirm.
 
I had considered the current AC line voltage when I commented about the 8122's.
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