Quote:
Originally Posted by dieseljeep
Boost the line voltage another 10 volts or so.
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And if that shows promise, consider sticking a few 9V batteries in series in the B+ line feeding the H.out circuit. That would give it even more grunt, B Boost and HV without overstressing the heater string.
This would at least give a yes/no whether raising B+ further on the H.out circuit would help.
The battery string would go in the B+ line feeding the plate (pin 5) of the 12AX4. If it helps, then consider building a small dedicated supply in place of the batteries.
Just a thought FWIW.