[Amps] Tube Burn In Question.

R.Measures r at somis.org
Fri Jun 18 23:00:53 EDT 2004


On Jun 18, 2004, at 7:17 PM, ab5mm wrote:

> The 20+ year old 3-500Z Eimacs have lost their brilliance.

=F0  See an ophthalmologist ASAP..

> I finally broke down and purchased a new pair to go into the Henry=20
> 3K-A today at HAM-COMM.
> My question is how should I "burn in" the tubes?

=F0  I never have.  So far, no problem.  The Amperex and the Eimac =
3-500Z=20
tech data sheets say nothing about burn-in.
-  If you hear any arcing, it's not from inside the vacuum, so don't=20
expect it to get better from self-gettering.

good luck, Steve

> How many hours?
> Only filament and blower on? (I did the mod to cool the pins)
> Filament voltage? (I can vary it)
> And finally, is there a general consensus on whether or not some=20
> portion of the burn in time should include plate voltage (no drive,=20
> just idle current? (I can vary this also)
>
> As always, Thank You for the input.
>
> Steve
> AB5MM
>
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>
Richard L. Measures, AG6K, 805.386.3734.  www.somis.org



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