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- Thread starter kopcicle
- Start date
BJ radionut
Supporting Member and 6m addict
Those are nice amps...but very LOW DRIVE...like 20-50 W SSB...Those GOOD tubes are very HARD to find/ 8122 $$$ (RCA)...Burle type don't have near the gain...
So be nice to her
All the Best
Gary
So be nice to her
All the Best
Gary
That one is a good candidate to build-in a 'soft key' circuit.
The relays run from 12 Volts AC. No big deal for radios that key the external amplifier with a relay, but newer radios will suffer severe damage if you try to key this thing with a normal keying cable to the radio.
Sure did make a mess of the last Yaesu FT-757 I saw hooked up this way.
73
The relays run from 12 Volts AC. No big deal for radios that key the external amplifier with a relay, but newer radios will suffer severe damage if you try to key this thing with a normal keying cable to the radio.
Sure did make a mess of the last Yaesu FT-757 I saw hooked up this way.
73
Well aware of the drive limitations with or with out the swamped grid input. Currently have it configured for high drive and keyed directly from a TS-830S . I have used 8072's for testing with 10 watts drive (CW) , This is the second one I've had across the bench, near 22 years apart . Yes the RCA were built on a different process than the Burle and Eimac never quite figured it out .For anyone that cares look up Carl , KM1H . He was part of the design and engineering team at National and is still active and ornery as ever 
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Very cool redraw of the diagram. Thanks for posting that. Only found one error so far. The jack marked "bias test" is the ALC output. The jack directly below that one is not labeled. That one is the bias-test socket.
Hard to believe that a designer of an amplifier I drooled over in high school is still around. I have one here that was going to get converted to Svetlana "4CX400" tubes. Can't remember the soviet military designation of that one right now. GS-36b, maybe? Anode's rated at 400 Watts, and almost the same diameter anode ring. Moving the tube sockets farther apart to accommodate a tube with a larger-diameter anode ring just looks like it's not doable. Kinda like the cobbler's shoes. A project that's repeatedly put aside to do paying jobs.
The HV-transformer primary relay has a 12-Volt AC coil, too. Got in the habit of using a 24-Volt DC 3PDT relay to replace it, with a full-wave voltage doubler circuit to power it. Tricky part was to make the filter caps small enough that it will drop fast enough if the overload relay trips it.
Should be a perfect match for the TS-830.
73
Hard to believe that a designer of an amplifier I drooled over in high school is still around. I have one here that was going to get converted to Svetlana "4CX400" tubes. Can't remember the soviet military designation of that one right now. GS-36b, maybe? Anode's rated at 400 Watts, and almost the same diameter anode ring. Moving the tube sockets farther apart to accommodate a tube with a larger-diameter anode ring just looks like it's not doable. Kinda like the cobbler's shoes. A project that's repeatedly put aside to do paying jobs.
The HV-transformer primary relay has a 12-Volt AC coil, too. Got in the habit of using a 24-Volt DC 3PDT relay to replace it, with a full-wave voltage doubler circuit to power it. Tricky part was to make the filter caps small enough that it will drop fast enough if the overload relay trips it.
Should be a perfect match for the TS-830.
73