[Hallicrafters] HT-33A PL-172A Tube substitute modification

[Glen Zook]

My particular HT-32A (actually came from the factory with HT-33B circuitry) was badly hacked by a previous owner and the PL-172 is bad.  I am in the process of converting it to use a Russian GS-31b.  That tube is still reasonable in cost and is the same diameter as the PL-172 and the chimney fits fine.
 
Glen, K9STH


Website:  http://k9sth.com


________________________________
From: jack m <oldvette at hotmail.com>
To: hallicrafters at mailman.qth.net
Sent: Saturday, November 5, 2011 4:56 PM
Subject: [Hallicrafters] HT-33A PL-172A Tube substitute modification


Hello group,

For 5 years, I have patiently searched for a useable PL-172A tube for my HT-33A amp.  3 EBay used PL-172A "wins" have been - well, you guessed right.

The PL-172 market is getting worse!  In favor of a winter boat-anchor project this year, I've decided to give up looking.  

As much as I would like to keep this near-mint amp original, the desire to actually use it with my HT-32A has won out.  I was discussing this on the air this past week, and the ham on the other end recalled another ham who had converted his HT-33A rig to run one of the ceramic tubes, but he was not a boat anchor afficianado and did not have any details.  He did recall that ham as stating that the socket and chimney/air cooling system, as well as the various voltage supplies, were not all that difficult or complicated to modify and adapt to the HT-33A chassis or design power supplies.

Is there anyone out there who knows of this mod, and where could I find the details?  As a "purist", I would prefer to be able to de-modify it in case the PL-172 market improves sometime in the future.

Thanks

Jack W3RU                            
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