Old Soul

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#546
I know that Pras had ( maybe still have them) those big Ge Papa did show around min 4

Though, according to datasheets, 2N1099 are superior in temperature domain and maybe even power wise, so I didn't pull that trigger

dunno , still question mark, is that comparison truthful or not, only real tests can show ........ anyway - small stash of 2N1099 I have, snatched in few different ocassions, did show that each of them is trouble free

but, as experience did show - with all these old ones - in first time you must deal with them as they are TNT, ready to blow every second

Tangerine_Dream_-_Sorcerer.jpg
 
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#548
Just a quick update. I consider my Old Soul to be complete as it sounded lovely as is. It's very quiet, quite cool running, and the only the hiccup I had was my bad luck with some 2n1099 devices. To me, it's an amp well worth building and I hope others will try it.

Thank you Mighty ZM for sharing this with us.

My next amp project will be something larger (5U/500) and hotter running. Unfortunately with some stuff happening here I likely won't be able to start till May...

Cheers,
Dennis
 
#555
Zen Mod said:
shall we try DEF stage with Toob and Mosfet now?

:devilr:
Click to expand...

I'm game !
😀

No, really !
Let's see, an EL84 needs about -10V of bias ... if I take the SissySIT R.3 biasing method, at 30 mA from the current source, we are looking at a level shifter resistor of 330R, with a dissipation of 300 mW ... s, a 1W or 2W resistor should be fine ...
We would need an output transformer ... would a P-P transformer work, or would you need an SE transformer ... bias currents can be made to cancel, but what about signal current ?

... or am I too fast ? 🤓

Regards, Claas
 
#557
Dennis Hui said:
Just a quick update. I consider my Old Soul to be complete as it sounded lovely as is. It's very quiet, quite cool running, and the only the hiccup I had was my bad luck with some 2n1099 devices. To me, it's an amp well worth building and I hope others will try it.

Thank you Mighty ZM for sharing this with us.

My next amp project will be something larger (5U/500) and hotter running. Unfortunately with some stuff happening here I likely won't be able to start till May...

Cheers,
Dennis
Click to expand...

Congratulations on crossing the finish line Dennis! I hope you will have many chances to enjoy Old Soul while you wait for May to come around.

DEF + Tubes + Mosfet?? This greenhorn cannot resist 🙂
 
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#560
Since summer has arrived, I just recently swapped f4 / old soul.
BIG smile. (Same goes for the swap the other way round of course.)

I especially like the way old soul wakes up, all uncombed and distorted and comes to its working condition after warmup. Just like me before I got my coffee 😁
 
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