• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

60 watt tubeamp with Low B+

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From 6moons

The reason the Gennis I60 runs so cool is that I only run the [plate voltage of the KT88s at around 200V.]





Can some one tell Us with 200B+V how I can get a tube amp With two tube say Kt88s pr ch.putout 60watts?

Thanks
 
Looks like it would take the largest sweep tube to do it. A 6LW6 pair into a 1 K Ohm P-P OT would just do it on 200V B+, likely requiring some class AB2 grid current drives. You need that big 400 mA max DC spec of the 6LW6 to meet the average current. Running at low B+ is inefficient, the tubes will run hot, the screen grids will be hot, and the distortion will be high. (Maybe the amp in question has some Mosfets under the cover? Or it's using sweep tubes with screen grid drive maybe? Although I would think screen grid drive would be dangerous for the health of the tubes with low B+)
 
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Nope, the pictures in the review make it clear that it's a very conventional p-p KT88 amp. So there's either mis-communication, fabulation, ignorance, or a combination thereof.

I don't take much in audio review magazines seriously, but of all of them, 6 Moons is the one to take least seriously. Their standards are, to be kind, pitiful.
 
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