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Phill, you can replace the 6U5/6E5 eye tube with a much cheaper 1629. The 29 uses an octal base and has a higher heater voltage which can be worked around by using a voltage doubler on the filament, and either puting new socket in or taking the base off a dud 6U5 and useing it, a octal socket, and the doubler to make an adapter.
just thinking outloud.
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