On Oct 17, 2005, at 5:35 PM, Tim wrote:
> Hello all:
>
> I recently acquired a beautiful Henry 2KD Classic desktop amplifier.
> It works fine and makes good power- but... It is drawing idling
> current while sitting in standby. Henry told me that I probably have
> a shorted tube but I haven't been able to confirm that fact. I did an
> ohmmeter check and the tubes seem fine at DC.
Damaged 3-500Zs often only filament-grid short when the filament is hot
-- i. e., expanded. The only way to find such a problem is with a
high-potential tester. If the grid-fil breakdown potential is under
5000v when the tube is cold, it may short when the fil is hot.
> They are late Amperex 3-500Zs with the plates that look like stacked
> coins
the graphite plate/anode
> as opposed to the Eimac zigzag folded plate.
>
>
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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