>> In working on the AL80A, I got a manual where I found out about the 400mA
>IP
>> limit. I am certain that I was running the other AL80A much higher than
>> that. While the amp did not malfunction, I was concerned about the
>quality
>> of my signal. Hence my question about the limits. If 400 mA is the real
>> advisable limit for signal quality with one 3-500, then the TL922 is
>> probably the better choice. If the TL922 can be run in CW mode in the SSB
>> position (several have told me that they do this all of the time) then the
>> TL922 is definitely a better choice than the AL80A as a backup and there
>is
>> no point carrying amps down and back.
>
>The AL80's have a good reputation, are reliable, and are definately not
>"splatter boxes" even when pushed a bit beyond ratings.
>
** When a single 3-500Z is driven by 100w, IMD is not good.
>The "400mA limit" is not a point where suddenly you will have major
>splatter. It is the SLOPE of the operating load-line that determines the
>production of harmful IM products, not the fact a line starts to change into
>a curve.
>
>You can find this discussed in Care and Feeding of Power Grid Tubes by
>Varian, as well as discussions of IVS (intemittent voice service) operation.
>
>73 Tom
>
>
>_______________________________________________
>Amps mailing list
>Amps@contesting.com
>http://lists.contesting.com/mailman/listinfo/amps
>
- R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K,
www.vcnet.com/measures.
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