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@jeremy.qozzy.com>
To: RAY FRIESS <rayfrijr@msn.com>; Amps@contesting.com; chris@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.
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