[Amps] HV/Tune-up Procedure for AL-80A

[R.Measures]

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
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>

Richard L. Measures, AG6K, 805.386.3734.  www.somis.org