K40 or K42 Russian PIO: what would you use/recommend?

jarthel · 23rd June 2007, 09:28 AM

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

Thank you

jarthel · 23rd June 2007, 10:21 AM

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

Svein_B · 23rd June 2007, 10:45 AM

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.

dcd · 5th December 2011, 09:23 AM

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

rock4016 · 5th December 2011, 01:21 PM

I prefer the K40-Y9 to the K42, it's probably my favorite of the Russian tubes.

23rd June 2007, 09:28 AM	#1
jarthel diyAudio Member Join Date: Jan 2002 Location: somewhere in Australia	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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23rd June 2007, 10:21 AM	#2
jarthel diyAudio Member Join Date: Jan 2002 Location: somewhere in Australia	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

23rd June 2007, 10:45 AM	#3
Svein_B diyAudio Member Join Date: Oct 2005	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.

5th December 2011, 09:23 AM	#4
dcd diyAudio Member Join Date: Jan 2006	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

5th December 2011, 01:21 PM	#5
rock4016 diyAudio Member Join Date: Aug 2005	I prefer the K40-Y9 to the K42, it's probably my favorite of the Russian tubes.

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