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[Amps] PL172 (8295)

To: Amps@contesting.com
Subject: [Amps] PL172 (8295)
From: Chris Pedder <chris.g3vbl@gmail.com>
Reply-to: chris@g3vbl.co.uk
Date: Sat, 6 May 2017 14:11:16 +0000
List-post: <amps@contesting.com">mailto:amps@contesting.com>
For the last 37 years my Hallicrafter HT33A has been sitting on the floor
in the garage with an 8295A (Ceramic) fitted. I have a pair of 'new in the
box' PL172s one of whose boxes is still sealed. Packing date was 6/67 so
that's almost 50 years.
I suspect that the glass seals will have leaked but is there anyone with
experience of these tubes after such a long period of time. If I were to
construct a hi-pot device, what sort of values should I expect from a
'good' tube? Thanks.

Chris G3VBL
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