15-05-2020, 12:50 AM
Amie Wrote:http://www.r-type.org/exhib/aaa0343.htm
http://www.r-type.org/exhib/abh0037.htm
Just for comparison.
Valve museum states of the 6BW6 that it is the same valve stuffed into noval glass. brimar specs are the same, even if structure is different.
I think the structures are different - but yes, agree the characteristics are the same.
Measuring as accurately as I can, through the envelope:
6V6 anode support pins (visible on top mica) are 19.5mm apart, so wouldn't fit the B9A.
6BW6 anode is approximately hexagonal, 14mm across-flats, so isn't going to go in the B7G envelope.
6AQ5 anode is circular, 12.5mm dia.
The 6AQ5 and 6BW6 electrode structures look the same height. The 6V6GT isn't visible (though I may have a 6V6G, which hopefully will be).
They're definitely different dimensionally.
What is surprising, is that the three valves have the same heater rating, 6.3V 0.45A. Somehow, I'd have expected the small B7G version, with its anode enclosing things more, to need less power. Bit it doesn't.
