Scott -- The recommended tune-up procedure in the Owner's Manual talks
about using more current than the tube mfg's max rating of 400mA. I
would tune a single 3-500Z at 400mA - which requires c. 70w drive. If
the exciter is a 100w radio without a power output control, adding c.
25-ohms in series with the cathode coupling C will prevent overdriving
the tube, result in a more accurate tune, and avoid rotten splatter.
cheerz
On Nov 11, 2004, at 10:10 PM, Scott Manthe wrote:
Hi the the List,
I just got a very nice Ameritron AL-80A, which seems to be in very
nice shape- certainly excellent cosmetically. Unfortunately, the
fellow I bought it from neglected to pack the manual with it and I'm
expecting it in the mail in a day or two. In the meantime, I'm
wondering if anyone can let me know what I should see for high voltage
(I'm seeing about 3000-3100 volts, on a 115 volt line) and what the
tune up procedure is for this amp. I've had it on for a few hours
idling, just in case the tube- an Eimac- might be a bit gassy from
lack of use, but haven't put any RF into it, but I'd like to get on
line ASAP. Is 3000-3100 volts reasonable for this amp at 115v line
voltage? Any assistance any of you can offer will be most appreciated!
Thanks and 73,
Scott, N9AA
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Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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