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In Reply to: RE: A SPDT switch works perfectly posted by DAK on November 03, 2015 at 08:48:08
Not knowing too much about electronics, I only know that variable resistors can get quite hot. An SPDT switch, I guess, wouldn't have that problem. I could add a 200-215 ohm, 3W resistor in parallel with the 500 ohm 3W one and use the switch to cut off the smaller resistor, right?
Follow Ups:
If you are going to use just the large resistors then you need to wire the cathode to the center pole of the switch and run one resistor from the outside pole to ground and again the second resistor on the other outside pole to ground. And don't forget your bypass cap. cheers, Dak
My suggestion was to leave the 500 ohm resistor in place and use a switch to place a 220 ohm resistor in parallel with that 500 ohm resistor when 150 ohms are wanted and out of circuit when the 500 ohms are wanted.The 220 ohm resistor could be permanently connect to ground and the other end could be switched to connect to the cathode or disconnected from the cathode.
He uses one shared cathode resistor for both output tubes so it would only take one single pole single throw switch to get the job done for his stereo amplifier.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 11/03/15
nt
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