Old Soul

[Zen Mod]

Old Soul is really one special amp

no particular merit from my side, it simply happened, as it was meant to be

 

[myleftear]

Still:

 

[twitchie]

2N3615 Work perhaps? Specs very similar to 2N1099 except TdP 77W vs 150W for 2N1099.

Too much to ask from an old horse? We don't push them anywhere close to limit but more options can only be good.

 

[Zen Mod]

keep it coolest possible, dissipation as prescribed and no reason it will not work, happy and for good

 

[Nelson Pass]

Jonathan Harris. He also had a great bit part in a Twilight Zone episode and apparently about 500 other appearances....

Oh the pain.....

 

[astouffer]

2N3615 Work perhaps? Specs very similar to 2N1099 except TdP 77W vs 150W for 2N1099.

Too much to ask from an old horse? We don't push them anywhere close to limit but more options can only be good.

How do you get around the bad ft rating for the 2N1099? Only good for 10khz.

 

[Zen Mod]

you have a measurements of an amp, as a whole

now, good for 10KHz, in which arrangement?

common emiter, common colector, common base ?

 

[myleftear]

My wonderful amp get quite warm when running some hours, chassis gets close to the @#$~threshold…
What should I consider to be the limit before thinking about a babysitter or other measures?

 

[Zen Mod]

dunno, for long life maybe 45C at sinks, counting bespoke thermal arrangement for GE

 

[nicoch58]

a good babysitter is all we need

 

[myleftear]

As „@#%“ leaves room for interpretations, I‘ll measure temp at the GE when I’m back.

 

[nicoch58]

@#% min 60°

 

[myleftear]

Definitely only almost there
(Fingers said „woohoo, that’s, like, warm“)

 

[Zen Mod]

then Babysit it

It just ads Fancy, if you make it properly

and fan can be both silent and invisible

 

[myleftear]

Yes but—no treatment without measurement… 😎

 

[thorstenlarsen]

How do you get around the bad ft rating for the 2N1099? Only good for 10khz.

300 hz or 10khz is probably not ft but the frequency where hfe starts to fall. 😉
Thorsten

 

[Zen Mod]

speaking of Ge - emiter follower, substantial part of drive being emiter drive (see it as common base arrangement)?

as measurements (post #7) are showing, nothing to write home about

 

[myleftear]

Ah, here I am again, fulfilling my promise: Measuring the temp at/on the GE's ...
I get s measly reading of 44.5°C, HA!
This is with around 18°C room temp. In Summer I had something around 25° or so, but c'mon!
I knew I'm a sissy, but this...

 

[Zen Mod]

still happy with sound, even if amp is old and cold?

 

[myleftear]

YES.