Re: Battery Valve portable
Typically these sets are not particularly sensitive. Some manufacturers added an extra valve to try to improve things. The 60V HT used in your set won't help.
It's possible the DK9x or DF9x is weak - these battery valves don't last as well as indirectly heated valves, I guess because compromises were made to reduce filament current and improve battery life.
Best regards, Paul
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