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Originally Posted by Steve McVoy
I don't think the 10SP4 will fit in a TV22. The shell is about the same size as the 10BP4, with a shorter neck. The face is completely flat, and I think the diameter is too large to fit.
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Meanwhile I have got a 9" spare tube from a guy in a neighbor village which will fit. It was pure coincidence. I never talked with somebody here that I am looking for a 9" tube.
One day, the telefon rang and he was on the line. I did not know him, but he asked me whether I want the tube. He is cleaning out the attic. After some discussions--he wanted 100 EUR for it-- I got it for 40 EUR.
It is a MW22-1. But I have reduce the filament voltage down to 4 volts. Here are some pictures:
http://bs.cyty.com/menschen/e-etzold...img/MW22-1.JPG
http://bs.cyty.com/menschen/e-etzold...W22-1anode.JPG
http://bs.cyty.com/menschen/e-etzold...MW22-1neck.JPG
Eckhard