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RE: Is running DHT's in H plane Ok ?

It's the filaments that can sag - they have by far the greatest thermal expansion issues. The 300B spec sheets indicate the filament plane as pins 1 and 2, which must be vertical if the tube is horizontal. The 1939 Tung-Sol 2A3 sheet shows the same, but the RCA sheets (I have 1933 and 1945) don't say anything. Probably the biplates are different from the monoplates. The 45 data sheets also call for a vertical filament plane of the tube is lying down.


Edits: 08/12/16
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