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E130L PP Power Amplifier
E130L PP Power Amplifier
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Old 13th November 2020, 03:36 PM   #11
frentec is online now frentec  France
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Default UL Winding input voltage

The transformers are being made with UL winding, it was offered at no extra cost, but I may not use it, 6V in is a lot, any suggestions are welcome, it is a loosely based design. I do have a couple of ccs boards built from kk audio somewhere.
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Old 13th November 2020, 03:38 PM   #12
artosalo is offline artosalo  Finland
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If semiconductors are OK, then this is well working 6N6P LTP.
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Old 13th November 2020, 03:42 PM   #13
artosalo is offline artosalo  Finland
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Quote:
UL winding, it was offered at no extra cost, but I may not use it...
Then you are limited to pentode mode (with 150 Vdc to screen grids).
In this case you will need even more GNFB.

Quote:
6V in is a lot, any suggestions are welcome..
Add one 6N6P as a voltage amplifier, ahead of the LTP.
Then you can add negative feedback easily.
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Old 13th November 2020, 03:49 PM   #14
frentec is online now frentec  France
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Default 2C22

I also have some 2c22 7193 tubes, would these be better?
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Old 13th November 2020, 03:57 PM   #15
frentec is online now frentec  France
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Default UL Tap

If that's the case then I probably will use the UL Tap
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Old 13th November 2020, 04:55 PM   #16
frentec is online now frentec  France
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Default 6N6P

Quote:
Originally Posted by artosalo View Post
Then you are limited to pentode mode (with 150 Vdc to screen grids).
In this case you will need even more GNFB.



Add one 6N6P as a voltage amplifier, ahead of the LTP.
Then you can add negative feedback easily.
I ordered 8 more 6n6p's
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Old 13th November 2020, 05:01 PM   #17
Depanatoru is offline Depanatoru  Romania
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With only 250V max on G2 ( and typical 150V ) this is not a tube for ultralinear or triode mode in push-pull , even if you want . Maybe for single-ended .
So the best option is a stabilized G2 voltage , 150V or so .
Very similar with horizontal sweep tubes , wich have low voltage G2

Last edited by Depanatoru; 13th November 2020 at 05:06 PM.
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Old 13th November 2020, 05:05 PM   #18
artosalo is offline artosalo  Finland
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This is what I would build...
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Old 13th November 2020, 05:07 PM   #19
v4lve lover is offline v4lve lover  Netherlands
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E130L PP Power Amplifier E130L PP Power Amplifier
Agreed, very good schematic, i would substitute another BJT like MPSA42 for the TL431 instead because the CCS will have slightly better AC impedance at the expense of DC stability. The latter being of no real concern given that its a AC coupled design.
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Old 13th November 2020, 05:29 PM   #20
artosalo is offline artosalo  Finland
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The point where CCS is, i.e. at the cathodes of 6N6Ps has quite low impedance.
Then the demand for high dynamic impedance of the CCS does not exist.
Actually a LTP works fine even with a few kilo ohms resistor as a tail.

The idea of the CCS I suggested is that it has low noise and does not need negative supply voltage.
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