Pio russian capacitor K42-11...is good ? - Page 2

Mr. Zenith · 07:58 PM

Wavebourn, no need to apologize for your English; your written skills are much better than the verbal skills of many native American English speakers I know.

I recently completed a VTA ST-70 build, and I went with the Russian PIO cap upgrade. I can't say they made a difference as I didn't hear the amp before installing them. I can say the amp sounds very nice. I was struck by their physical size though. They're relatively huge!

ervinl · 29th October 2010, 03:32 AM

What about K75? I use this since it has higher voltage range than K40 or K42 (so I think it should be safer for tube coupling cap).

Ervin L

Wavebourn · 29th October 2010, 05:18 AM

К75 capacitors may be very very different. For example, K50-63 are made of paper & foil,
K75-93 are metalized film impregnated, and so on.

ervinl · 29th October 2010, 07:13 AM

Quote:

Originally Posted by Wavebourn

К75 capacitors may be very very different. For example, K50-63 are made of paper & foil,
K75-93 are metalized film impregnated, and so on.

I use K75-10. It is claimed as oil (PILO). It has a rating up to 800V DC (500V AC), instead of K42 that only 250V DC OR 160V AC (CMIIW).
I use B+ of around 220V DC, this voltage is marginal.

Thx,

Ervin L

Wavebourn · 29th October 2010, 08:15 AM

K50-10 are metalized, but made for high currents in pulse regimes. AC rating is given for 50 Hz.

Tangent of angle of losses is 0,008
24 gigaOhm insulation.

M Gregg · 29th October 2010, 02:15 PM

Quote:

Originally Posted by Wavebourn

K50-10 are metalized, but made for high currents in pulse regimes. AC rating is given for 50 Hz.

Tangent of angle of losses is 0,008
24 gigaOhm insulation.

Just for information,

Do these capacitors contain PCB?

Polychlorinated biphenyl - Wikipedia, the free encyclopedia

This link is for those that may not be aware of PCB's used in some components!

Regards
M. Gregg

Wavebourn · 29th October 2010, 02:57 PM

Quote:

Originally Posted by M Gregg

Just for information,

Do these capacitors contain PCB?

Polychlorinated biphenyl - Wikipedia, the free encyclopedia

This link is for those that may not be aware of PCB's used in some components!

I am not aware if Soviet capacitors ever contained PCB. Paraffin, bee's wax, mineral oils - what I've seen there.

piano3 · 29th October 2010, 05:01 PM

I have used either K75-10 or K75-24 in every amp I have built but always as either bypass caps for the power supply electrolytics or in the snubbing network in choke input PSU. I think it would be hard to find better caps for this purpose.
I guess they might also be suitable for parafeed caps.

Ervinl; K40U-9 and K42U-2 are available up to 1600V. Excellent eflog seller Dmitriy Kolevatov (user name uralspirit) has good selection at higher voltage and is happy to sell small numbers.

M Gregg · 29th October 2010, 05:19 PM

Quote:

Originally Posted by Wavebourn

I am not aware if Soviet capacitors ever contained PCB. Paraffin, bee's wax, mineral oils - what I've seen there.

Trade name from the link

Former USSR

Sovol
Sovtol

Regards

M. Gregg

piano3 · 29th October 2010, 05:26 PM

Surely PCB's were mainly used in capacitors utilised in power generation- not in the kind of ones we all use?

27th October 2010, 07:56 PM	#11
Mr. Zenith diyAudio Member Join Date: Aug 2009 Location: Central NC	Wavebourn, no need to apologize for your English; your written skills are much better than the verbal skills of many native American English speakers I know. I recently completed a VTA ST-70 build, and I went with the Russian PIO cap upgrade. I can't say they made a difference as I didn't hear the amp before installing them. I can say the amp sounds very nice. I was struck by their physical size though. They're relatively huge! Last edited by Mr. Zenith; 27th October 2010 at 07:58 PM.

29th October 2010, 05:18 AM	#13
Wavebourn diyAudio Member Join Date: Sep 2006 Location: Pleasant Hill, CA	К75 capacitors may be very very different. For example, K50-63 are made of paper & foil, K75-93 are metalized film impregnated, and so on. __________________ If I disappear suddenly, that means I finally created a time machine and pushed wrong button that brought me to Stalin's Russia. In any experiment any result is the result. Even if it is negative.

29th October 2010, 08:15 AM	#15
Wavebourn diyAudio Member Join Date: Sep 2006 Location: Pleasant Hill, CA	K50-10 are metalized, but made for high currents in pulse regimes. AC rating is given for 50 Hz. Tangent of angle of losses is 0,008 24 gigaOhm insulation. __________________ If I disappear suddenly, that means I finally created a time machine and pushed wrong button that brought me to Stalin's Russia. In any experiment any result is the result. Even if it is negative.

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29th October 2010, 03:32 AM	#12
ervinl diyAudio Member Join Date: Mar 2010	What about K75? I use this since it has higher voltage range than K40 or K42 (so I think it should be safer for tube coupling cap). Ervin L

29th October 2010, 05:01 PM	#18
piano3 diyAudio Member Join Date: Aug 2010 Location: London,UK	I have used either K75-10 or K75-24 in every amp I have built but always as either bypass caps for the power supply electrolytics or in the snubbing network in choke input PSU. I think it would be hard to find better caps for this purpose. I guess they might also be suitable for parafeed caps. Ervinl; K40U-9 and K42U-2 are available up to 1600V. Excellent eflog seller Dmitriy Kolevatov (user name uralspirit) has good selection at higher voltage and is happy to sell small numbers.

29th October 2010, 05:26 PM	#20
piano3 diyAudio Member Join Date: Aug 2010 Location: London,UK	Surely PCB's were mainly used in capacitors utilised in power generation- not in the kind of ones we all use?

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