Hi revintage, welcome to TSSA thread
In TSSA Basic from post #1, Zout mainly depends on open loop gain (voltage gain if there would be no feedback present), higher the OLG the lower Zout is. If you higher 1k Rgs to 2,2k like Sonnya did, you get half Zout etc. I assume Zout is in a range 50-100 mOhm.
Regards, Andrej 😉
Don't be fooled guys, Lazy is making CSA in the background (behind the scenes). 😀 😀 😀
P.S. CSA - Complex Symmetrical Amplifier hahaha
From what I see it is slightly above 1 Ohm (Post#1). Worse than F5. But my paralleled IRF632/9630 version has zero output impedance 😀
Don't be fooled guys, Lazy is making CSA in the background (behind the scenes). 😀 😀 😀
P.S. CSA - Complex Symmetrical Amplifier hahaha
When i see what the simple gave i can't imagine what the Complex one will looks....
Marc
Yes Sonnya, that is correct!
Jay mixed up TSSA Basic with zero-feedback transformer output tube amp. 😀
When i see what the simple gave i can't imagine what the Complex one will looks....
Marc
hehe you're both right, you simply don't want to see that
LC i think "Lazy Cat" is absolutly not appropiate, "Crazy Cat" fit you as a surgeon glove on a hand....
Marc
Marc
Did a simple sim of the initial basic schematics and it showed in the ballpark of 2ohm with 1302/0281 and 557/547. But you seem to have a little higher openloop gain now.
So basically this is a transconductance amp that relies on NFB only for lowering Zout?
So basically this is a transconductance amp that relies on NFB only for lowering Zout?
The front act as an current source in this case and cannot feed enough current to the output BJT's. But add a output driver and the output impedance will Fall.
You are so right, I should maybe have used MOSFET output device when I copied one of the too far simplified schematics.
Actually, the bjt set with predriver and 0.1R emitter resistor Will give you lower distortion because of higher transconductance.
At 10 kOhm input impedance I suggest to use 22 uF or vice versa 10 uF at 22 kOhm (have to change) input resistor, to get 4,5 Hz/-4dB high pass roll off. Also you need to have input side of the capacitor connected to GND via 1 MOhm resistor to define zero DC potential and to have no clicks by switching AC/DC coupling. 😉
Hi Gerhard 😉
I own you a great apology not to come to your booth at High End, the reasons are combined (bunch of crazy audiophiles lost orientation sense in a "playground", tight time schedule - one transport ...) and not completely justified I know. Please forgive and hopefully we'll stay cooperative as we were before.
Kind regards Andrej
No problem LC, i was not always at the booth anyway.
I designed a phono amp with tone controls for Fast Audio. The name is Tanzmusik.
I designed a phono amp with tone controls for Fast Audio. The name is Tanzmusik.