[Boatanchors] 6S7 Substitute

[bill riches]

Filament currents are different for each tube therefore if one of the tubes
was used in a series string filament circuit and was not the correct current
rating it would either not heat up or heat up too much!!

73,

Bill Riches, WA2DVU
Cape May, NJ


On the 6S7 page there's an asterisk next to the 6K7 that means "parallel
filaments".

On the 6K7 page there is NOT such an asterisk next to the 6S7.

Any idea what "parallel filaments" means?

73 Mark K3MSB