could the F5C or F5T be run at 40v rails?

[JZatopa]

I'm curious if the F5C or F5T could be run at 40V rails? Is that still to high for the cascoded frontend?

 

[AudioSan]

hello. with cascoded FR. it can be run at +/-40V rails.
but you need at least 3 pairs of outputs to get anything out of it.

 

[dazed2]

but you need at least 3 pairs of outputs to get anything out of it.

😕😕 what do you mean by that?

 

[AudioSan]

😕😕 what do you mean by that?

becouse out over that, it can be hard for only one pair of input J-fets.
well. it can handle 4 pairs. 3pairs may be the better chose.
and with +/-40V rails. you want to get someting out of it. with somewath high bias. to get full out of +/-40V you need 2.4A bias🙂
that is at 8ohms.

 

[JZatopa]

Could it be done with as little as 2 pairs?

 

[AudioSan]

yes. for v2 turbo.

 

[Bksabath]

Cascode vill take 40 V rails

But to keep thermal down (max 50 w disipation for each mosfet with proper heath sinks)
you wuld have to bias at 1 A for each mosfet with a bit of safety margin
So you run out of class A at about 8 V (but duble cek my maths) which ain't bad depending on speakers and listening abits.

To find out how much power you need cek this out
http://www.diyaudio.com/forums/mult...much-voltage-power-do-your-speakers-need.html

 

[Nelson Pass]

With adequate sinking, you could consider 1 pair, but you wouldn't want to
be abusing it.

😎

 

[JZatopa]

Thanks for the help guys, unfortunately I had to pass on the transformer I was going to use. I guess my F5T is going to have to wait.