When does PT fry from ^plate current ?

[petemoore]

I'm having trouble figuring out how much current I can draw from my PT.
If I slowly increase the amount of power drawn is it fairly safe to say that temperature would be the #1 PT killer ?
I have more than enough heater potential and current to add output and preamp tubes to this design.
Does 'Ia' = plate current in duncans application chart ?
if so..a 6v6 has .34 milliamp [I guess] output
12ax7 is something like .19 ?
Do you think the PT would...
A: Get Warm then Hot ?
B: Not be a problem ?
C: Instantly toast itself or something else ?

[tubeswell]

Hi Pete

What amp are you talking about?

An ordinary 12W 6V6 idles at about 36mA in Class A, and idles about 22-28mA in Class AB1. If you allow for about 38mA per 6V6 and 4mA for each 12AX7 and 10mA for 12AT7, and then multiply the whole lot by about 1.5, you'll have plenty.

Mind you, a 5E3 came stock with a 325-0-325 70mA primary, which would seem way underrated, but it works okay.

[petemoore]

When I see

I was trained as a child to be able to put the round object into the round hole.
That hole is there for a reason, and is perfect size to accept the 12ax7 'module' or...an 8 pin socket !
The tranny has very similar dimensions to the 5e3's..Hammond 125E series, slightly bigger.
I think it'll run a '5e3 compliment of tubes N/P.