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Old 5th December 2017, 01:37 PM   #11
Tyimo is offline Tyimo  Hungary
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Hi Artosalo!

Quote:
Therefore individual biasing is necessary in most cases.
Could you show me such a circuit (capacitor coupled) with B+ 260Vdc?

greets:
Tyimo
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Old 5th December 2017, 02:43 PM   #12
artosalo is offline artosalo  Finland
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Here you go.
If the cathode voltage of the phase splitter is above, say 75 V, you can decrease it by increasing the value of R2. Optimum is some 60...70 V.
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File Type: gif 6N1P_6N1P_cathd.gif (110.7 KB, 281 views)

Last edited by artosalo; 5th December 2017 at 02:58 PM. Reason: Modified schematic
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Old 5th December 2017, 02:58 PM   #13
Tyimo is offline Tyimo  Hungary
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Thanks!
Is this biased to 3mA? Isn't it not too low?
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Old 5th December 2017, 02:59 PM   #14
artosalo is offline artosalo  Finland
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Notice that I modified the circuit one minute ago.

What output tubes you plan to use ? Fixed or cathode bias ?

EDIT: I was a bit hasty with the simulation. The actual max. output is 30 Vrms with 0.62% THD.

Last edited by artosalo; 5th December 2017 at 03:06 PM.
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Old 5th December 2017, 04:21 PM   #15
Tyimo is offline Tyimo  Hungary
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Thanks!

I was interested it only in theory.
If I would use it then it would be the attached schematic.
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File Type: jpg pp amps examples for ps-4 el84.jpg (53.7 KB, 266 views)
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Old 5th December 2017, 06:30 PM   #16
sser2 is offline sser2  United States
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Quote:
Originally Posted by Tyimo View Post
"Replacing any coupling capacitors with a well designed and correctly matched driver or interstage transformer yields an almost shocking improvement in sound..." Peter Qvortrup
This quote is highly relevant to a phase inverting stage.
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Old 6th December 2017, 02:50 AM   #17
Fenris is offline Fenris  United States
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Tyimo is right on. That schematic is from Broskie and I've used a modified version of it before with great success: Just what the world needs - another EL84 amp

You could also try replacing the anode resistor with a CCS and/or the cathode resistor with a red or yellow LED.

The amp I'm working on does something similar. It's a PP EL-84 and uses a 6N1P as the driver and phase splitter, but with an order of magnitude lower distortion.
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Old 6th December 2017, 05:56 AM   #18
Tyimo is offline Tyimo  Hungary
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Hi!

I just wanted to know what would be the ideal bias for the 6N1P in this Tubcad circiut with a lower voltage. say ca. 250-260 B+.
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Old 7th December 2017, 02:16 AM   #19
Fenris is offline Fenris  United States
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Aim for half of B+. 25-26K for the anode load and the same 340 ohms on the cathode. Or better yet a red LED on the cathode.
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Old 7th December 2017, 07:39 AM   #20
Tyimo is offline Tyimo  Hungary
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Thanks!
What about the concertina stage?
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