[Amps] PL172 (8295)

[Glen Zook]

The chances of a PL-172, that has been unused for years, being good (no air leakage), are somewhere between extremely slim, and none!


I have a very late version Hallicrafters HT-33A (has all the circuitry of the HT-33B but not the dual meters, etc.) that has been badly "hacked" and cannot be easily, if at all, restored to original condition.  That amplifier is definitely a candidate to be modified to use a Russian GS-31b triode.  The GS-31b is the same diameter as the PL-172 and things like the blower, etc., will work without any changes.

 Glen, K9STH 
Website: http://k9sth.net

      From: Carl <km1h at jeremy.qozzy.com>
 To: RAY FRIESS <rayfrijr at msn.com>; Amps at contesting.com; chris at g3vbl.co.uk 
 Sent: Saturday, May 6, 2017 10:52 AM
 Subject: Re: [Amps] PL172 (8295)
   
The original PL-172 with glass seals is NOTORIOUS for air leakage and not 
outgassing from the anode.....big difference.