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50.4.127.98
In Reply to: RE: How many KT170 posted by walge on July 19, 2024 at 13:22:40
Wow..double the plate rating and nearly no increase in cathode heating power?
Suggest 4 pairs in pentode. B+ around 350 and idle per tube at 160 mA.
That is not going to be a light amp... :) and mind grid circuit resistance. I suspect the .5M rating is cathode bias. I doubt they'll be happy/stable at anything over 100k each. Which gives you a 25kOhm load to drive. and 8 bias measurements/adjustments...
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
Follow Ups:
So, 600 Ohm a-a output will deliver 300 Ohms to each phase in Class A. If we take four pairs, and idle them a bit higher at 175 mA, the quad will carry 700 mA. Break out Ohm's Law. You are looking for how much voltage 700 mA can develop across 300 Ohms. 210 Volts. For how many, figure each can swing 52 volts. That load may take 6 pairs to get up around 300V. B+ can be higher since we'll not be able to swing the plate to zero volts.
Now for the fun part, how much power. You'll be able to put 600V across that 600 Ohms( one side 300V up, the other 300 down ). So a 600W( peak ), Class A amp for your trouble.
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
Once you get rolling, don't forget pics and a schematic.
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
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