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[AMPS] Sealing of RF chamber

To: <amps@contesting.com>
Subject: [AMPS] Sealing of RF chamber
From: amps@txrx.demon.co.uk (Steve Thompson)
Date: Sun, 24 May 1998 10:21:35 +0100
In message <RJM3pWAoNoZ1EwGE@ifwtech.demon.co.uk>, Ian White, G3SEK
<G3SEK@ifwtech.demon.co.uk> writes
>BTW, if you want to make measurements of heater voltage right at the
>pins, you can stretch Saran wrap over the grid/cathode box instead of
>the cover, and poke meter probes through it. It balloons up something
>alarming, but it keeps the air inside, and the little holes make no
>difference.

I've taken to running 1k resistor(s) from the heater pin(s) to
feedthroughs in the compartment wall. There's no risk if the test point
gets shorted to chassis, and negligible reading error with a DVM.

>
>A related follow-up question:
>
>Who are the makers of good, low-cost, amateur-size blowers in the USA,
>please? The only firm I've heard of are Dayton, but do the amplifier
>manufacturers have other sources? 

Papst RG160 family (RS and Farnell) appear good value in UK.

Steve

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