Quote:
Not sure if anyone has done this before, just before the amp was trialed I swapped the russian EL84's for a pair of new Miniwatts and not looking closely I did not realise that I actually pulled the EZ81 and one of the EL84's, on turning it back on I waited for the valves to warm up and waited and waited and waited and just as I thought something had gone wrong it sprang into life, did not sound out of the ordinary, played a few cords (the sum total of my guitar playing) and turned it off closed the workshop and retired to watch a movie with my wife, next morning it took a while before the penny dropped after seeing an EZ81 lying next to the russian EL84, one of Miniwatt EL84's had done a great job plugged into the rectifier socket.
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That has to be one plucky little EL84! While the heater and cathode pins are common with the EZ81 and the anode_2 is also correct, the other anode pin on the EZ81 is marked as "internal connection" on the EL84. That means that some unspecified internal structure was acting as an anode, unless of course the valve was only acting as a half-wave rectifier, but then the HT would have been half of what it should be.
Colin.