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The 6MH6 has an equivalent base pinout, so it should be usable, although
they are not common. You can build an adapter to change the pinout to a more conventional tube for testing. Tube testers can be tricked quite easily. If the tube is being used in a transmitter, it is not that difficult to change to a different type of final tube - including the 6146. If it is used in a grounded grid amp, the grids are all tied together, so you should be able to find a substitute and change a few pins on the amp. Hams are supposed to be good at improvising. 73, Colin K7FM |
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