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Author Topic: AL-811H with 572B tubes quick question  (Read 33460 times)
W8JX
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Posts: 13268




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« Reply #75 on: September 07, 2017, 08:20:42 AM »

So, in theory, you're saying that with 4 each 572b tubes in the amp (My choice because I already 4 on hand from my other amps), I could LEAVE my transmitter at 100 watts from when running barefoot; and tune up the amp with the 100 watts input. Obviously, tuned up in increments from say 20w to 60w to 100w or similar?Huh Or using a pecker, just leave the transmitter at 100w.

Yes you could but I would not go much over 800ma or so and key down tuned state. (this is why I said  more than 3 tubes is wasted here) Not for sake of tubes as even 3ea 572's can easily handle 800ma, but rather for sake of HV supply because 811H uses same supply/transformer as AL811 and it has little or no reserve left when used in a AL811H. 800ma @ 1500 volts key down is 1200 watts input.

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Ham since 1969....  Old School 20wpm REAL Extra Class..
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