[ARC5] BC-454-B tube question

[Kenneth G. Gordon]

On 2 Jul 2015 at 12:52, kg4kgl at gmail.com wrote:

> SET single ended triode amplifier.

Ah! OK. More audio power. ;-)

> The 6sl7 driver tubes had a max heater to
> cathode rating of 90v. There is 140v on the 6sl7, so the heater was raised by
> ~83v, so the tube would not exceed its 90v rating. 

OK. Makes sense now.

> When I saw similar ratings for some of the tubes used in the bc-454, I assumed
> the same problem would occur.

Nope. They are happy. 

> Call it a knee jerk reaction. :D

The same thing happens to most of us. :-)

vy 73,

Ken W7EKB