Hi Roger
It's not so much the tubes I'm worried about as the rest of the amplifier.
About 10 years ago I bought four unopened 1961-dated Penta 4-1000As in the JAN
boxes with what looks like the original paper tape. The seller said they'd
just been stored. Most are still in the boxes unopened but the two I've used
and interchanged having run up in the usual manner have been fine and give
great output.
It's all the old capacitors in long-unused kit that fail in my experience,
taking other components with them. I don't know how scientific a belief this
is, but old unused kit just seems to grow one dry joint after another, whereas
well-used kit seems to run and run.
Cheers
Dave G0OIL
-----Original Message-----
From: "Roger" <sub1@rogerhalstead.com>
To: "Dave White" <mausoptik@btinternet.com>
Cc: bill@k4fx.net; amps@contesting.com
Sent: 04/12/2009 19:33
Subject: Re: [Amps] (no subject)
Dave White wrote:
> It's the unused-for-30-years bit that would worry me. I've seen too many of
> these things go *BOOM* when fired up or just suffer from ongoing reliability
> issues.
>
I've never had a problem with an 813...so far. PL-172s OTOH...
73
Roger (K8RI)
> Cheers
> Dave G0OIL
>
[truncated by sender]
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