Grid drive one 4-400 with bias and screen voltage.? Then you can run Class C for plate modulation and bias it for AB1 or AB2 operation for SSB amplifier mode.
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A Johnson ranger or similar power level ?“boatanchor” would make an ideal driver for the Class C operation.? Lots of schematics available in earlier ARRL publications for such a set up. I think there was a 4-400A amp in several of the ARRL handbooks from the 1960’s.
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813’s get squirrely on 15M and above and can be tamed but efficiency drops a bit.
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What are the modulator tubes and which modulation transformer are you going to use?
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I’ve built several AM rigs in the past ten years and have pictures of them on my QRZ.com page.? Check out the 4-400A rig I designed and built.? Also the 813 rig.
Over the years I've collected parts to build an amplifier. Life got in the way during most those years but now I find myself with the time and ambition to build an amplifier for my boatanchors.
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As far as bottles are concerned I have a bunch of 813s a 3-400Z,. couple of 4-400s and of course the usual 811s, 807s, 6146s........Got plenty of iron for a power supply up to 3kv.
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Need some direction as to which way to go.? I operate 40 thru 10. Have a soft spot for AM. (yes I'm old) but do CW and SSB.
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Finishing up a 350 watt modulator.
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OR should I forget all this stuff sell it and buy an amplifier.
