K40 or K42 Russian PIO: what would you use/recommend? - diyAudio
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Old 23rd June 2007, 09:28 AM   #1
jarthel is offline jarthel  Australia
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Default K40 or K42 Russian PIO: what would you use/recommend?

Also would it be a good idea to bypass it with a K72 Russian teflon?

Thank you
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Old 23rd June 2007, 10:21 AM   #2
jarthel is offline jarthel  Australia
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they will be used in this circuit: http://www.nijnkonijn.nl/machmat/sch...er/se/anp4.gif

there are 3x .39uF per channel.

Thanks again
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Old 23rd June 2007, 10:45 AM   #3
Svein_B is offline Svein_B  Norway
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K40y-9 are very decent PIO caps, at reasonable price, and convenient values and sizes.

If you have more space and money you may want to consider the FT-3 teflons.

A little more info on russian caps:
Audioasylum: TEFLON FT3 CAPACITOR AND OTHER RUSSIAN CAP

DiyAudio: Russian oil caps ?

.39uF is a little inconvenient value. You will probably need to use 2 x .22uF in paralell, unless you can live with the slightly higher cut-off frequency of .22uF (I would).

Svein B.
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Old 5th December 2011, 09:23 AM   #4
dcd is offline dcd  United Kingdom
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Probably a bit this but looking at the circuit

http://www.nijnkonijn.nl/machmat/sch...er/se/anp4.gif

Why not use 8 x 0.1uF cross coupled from the driver anodes to the grids so each driver valve feeds both out put valves

This may lower distortion with "real" valves and better balance the currents in the drivers but perhaps thats not why you have an SE

Keith
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Old 5th December 2011, 01:21 PM   #5
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I prefer the K40-Y9 to the K42, it's probably my favorite of the Russian tubes.
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