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Questions about tubes and gear that glows. FAQ

RE: Will this work? Switching from 6.3 to 12.6 volts

It's surprising to me that the Eico ST84 powers the 6X4 with the same transformer winding as used for several preamp tubes. There have been many reported failures of the 6X4 when used with its filament grounded. Apparently, the heater/cathode insulation isn't what it should be. This has been known for a long time - all the old Akai reel decks powered the 6X4 from a separate floating winding. I don't know if the 12X4 has the same issue, but it's worth considering. Eico might have used a particular brand or style of 6X4 that was more resistant to this failure mode.

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