[R-390] Tubes new or used?

[charles bolland]

Hi all,

I must remind myself in the future "don't ask about tubes".  Too much
information.

Chuck
----- Original Message -----
From: "Bob Camp" <ham at cq.nu>
To: <bill at iaxs.net>; "R-390 HF Receiver List" <r-390 at mailman.qth.net>
Sent: Thursday, February 03, 2005 02:15
Subject: Re: [R-390] Tubes new or used?


> Hi
>
> Oddly enough you use helium for the same cooling in micro watt level
> precision quartz resonators. With them you look for a leak with a
> radiation sensor that finds a stuff at the few atoms level. Takes a
> long time to chop a 2X4 a few atoms at a time.
>
> Take Care!
>
> Bob Camp
> KB8TQ
>
>
> On Feb 2, 2005, at 8:36 PM, Bill Hawkins wrote:
>
> > Bob Camp said,
> > "If you ever want to sell the radio as a  "100% real
> > thing" then plug it back in."
> >
> > Ah, but don't turn it on!
> >
> > Hydrogen is used to cool multi-megawatt power company generators.
> > Less "air" resistance and better cooling. Lotta risk to using H2
> > but there must be a payoff. Then again, an invisible hydrogen fire
> > is no worse than an invisible 2000 PSI steam leak. You know the
> > leak is there because of the noise and the clouds of condensate.
> > You look for it with a 2X4. When the 2X4 gets sliced through,
> > you've found the leak.
> >
> > Regards,
> > Bill Hawkins
> >
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