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In Reply to: SLCF questions for Paul posted by Roy W on February 28, 2002 at 09:57:08:
Roy,98 volts across 27.4k is 0.35 watts, so the 0.33 watts rating seems a bit shy. Unless of course they are HUGELY under rated. Actually the 7.2 mA I run in my All Tube SLCF may still be a bit more than necessary, and 5mA may be all that is needed. Then just set up 69 volts across the paralleled 27.4k resistors, and each will dissipate only 0.17 watts.
I have not tried the "365k resistor to the plate" circuit, but I sure like having fast blow fuses in the output section. They are insurance for anything that I might screw up. I also like the idea of blowing a replaceable fuse. The 6AS7 and 6336 fused cathode lead are not replaceable, and I have blown them when I ran 5A (to large) fast blow fuses. Stick with 2ea, 2 amp fast blow for a M-60, one in each half of the circlotron. Install between the 1 ohm plate resistors, and the power supply (+) cap. You might need 3 amp fast blow of driving a 4 ohm speaker.
Modifications (a) and (b) will probably be less beneficial with the CVS in place, but you may hear some gains...you will never know unless you try it.
Paul Speltz
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- Re: SLCF questions for Paul - Paul Speltz 11:28:40 02/28/02 (0)
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