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In Reply to: RE: ECC99 Pin 9 confusion posted by banpuku on February 14, 2017 at 09:38:00
Connect one wire from your 6.3V source to pin 9. If you use the tube normally, pins 4 and 5 are tired together, and connected to the other wire from the 6.3V source. If you plan only to use either the left or right half of the tube, it's possible to apply 6.3V between pin 9 and pin 4 or 5, depending which half you intend to use. The unused half heater pin would be left floating.
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Thanks, very helpful.
Pat
Try a scheme to up the B+ on the 2A3-40 because your OPT trafo is a 20 watter so you can at least get to about 12 watts.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
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