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In Reply to: RE: kt150 tubes posted by caufieldclay@yahoo.com on March 01, 2016 at 05:05:14
The answer depends on your amp and the bias type, fixed or cathode.
Getting more power greatly depends on your amp itself if it can handle increased current and increased output signal (most amps designed for a particular, lower powered tube cannot).
If you just want to plug it in, the tube should run like any other tube in the 6V6/6L6/6550 family, just with higher plate watt capabilities. Run it like a 6550. However, if your quest is for more power (and your amp can handle it), here is how you adjust the bias.
If your amp puts 400 volts across the plate, your current draw needs to be less than 175mA per tube. 400 * 0.175 = 70 watts.
You are going to want more than -14 volts bias on the grid.
If you run them at 120 mA and 400 volts they will be sitting at 70% of max watt dissipation or 48 Watts. This is a safe setting.
If your amp has adjustable bias, measure the current until you get to 120/130 mA or so and you are good to go (until your transformers scream, get hot and short.)
Follow Ups:
I would caution that the KT150 ratings are listed under the "Design Maximum" rating. This is a less conservative rating scenario than the common "Design Center" values which are used on many tubes. I would recommend that you NOT operate the tube at or very close to 70 watts. 50-55 watts would probably be safer and certainly easier on the tube.
Check the link below for a great explanation of the 3 tube rating systems. It's the best explanation I've seen - the chart at the end is GREAT!!
I know of no commercial amp designed to use KT150s at the upper end of the ratings. And there is the 2 amp heater. They are pretty looking tubes though.
And I agree with the 48 watt suggestion. I wanted to point out the rating system difference between the KT150 and many other power tubes though. You can't compare one to the other without knowing the differences.
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