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4P10C or 4Π10C tube, any member familiar with?
4P10C or 4Π10C tube, any member familiar with?
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Old 17th November 2015, 04:46 PM   #1
adam2a3 is offline adam2a3  Greece
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Default 4P10C or 4Π10C tube, any member familiar with?

Hi everyone,

the 4P10C is a forgotten Russian octal pentode with plate cup (not MO) that has a 15W dissipation with specs close to EL34 (though it looks like a KT66 having a similar size box plate but smaller plate wings).

I don't see anything in the net about it.

I do have it's detailed specs as can be found on a paper packed by the factory inside the tube box.

Any member that has tested it in a project?
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Old 17th November 2015, 05:33 PM   #2
MrCurwen is offline MrCurwen  Finland
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Can you post the info?
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Old 17th November 2015, 05:54 PM   #3
dimitri is offline dimitri  United States
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4p10s-10e-231-Vt127-gb
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Old 17th November 2015, 07:18 PM   #4
adam2a3 is offline adam2a3  Greece
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Default Data sheet

Hi, attached you will find the data sheet. If you look at the bottom of the page I have the comparative test results performed on my AVO tester at Va=300V, Vg=230V and in all cases at a bias voltage that gave a plate current of 50mA.

The tubes compared were the following:
5881 S=5mA/V,
KT66 S=6.5ma/V and a
Philips EL34 S=9.5mA/V.

The 4P10C at the above conditions gave an S=8mA/V.
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File Type: jpg DSC00835.jpg (534.7 KB, 557 views)
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Old 16th February 2016, 10:41 PM   #5
Wavebourn is offline Wavebourn  United States
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4P10C or 4Π10C tube, any member familiar with?
I bought some today, going to try them.
They look similar to this one:

http://www.r-type.org/pdfs/pen46.pdf
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Old 16th February 2016, 10:51 PM   #6
Wavebourn is offline Wavebourn  United States
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4P10C or 4Π10C tube, any member familiar with?
Here are pictures, to compare with 6P3S

...hmmm... I could not attach the pictures:

"Your submission could not be processed because a security token was missing.

If this occurred unexpectedly, please inform the administrator and describe the action you performed before you received this error."
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Old 17th February 2016, 02:01 AM   #7
Wavebourn is offline Wavebourn  United States
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4P10C or 4Π10C tube, any member familiar with?
Here is the picture:
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Old 17th February 2016, 02:13 AM   #8
kevinkr is offline kevinkr  United States
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4P10C or 4Π10C tube, any member familiar with?
Interesting looking tube for a small pentode connected SE or PP amp.
Wonder what the linearity is like, given it's original application it should not be too bad if the proper load line is chosen.
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Old 17th February 2016, 03:23 AM   #9
Wavebourn is offline Wavebourn  United States
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4P10C or 4Π10C tube, any member familiar with?
It looks like KT66, but the screen grid is much closer to cathode.
I am going to try them in P-P.

6K load, 320V on anode, 220V on G2
With 8 mA/V it can be easily driven by a Concertina. 6F12P would deal with them easy.
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Old 6th November 2018, 10:06 PM   #10
TonyTecson is offline TonyTecson  Philippines
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4P10C or 4Π10C tube, any member familiar with?
Quote:
Originally Posted by Wavebourn View Post
Here are pictures, to compare with 6P3S

...hmmm... I could not attach the pictures:

"Your submission could not be processed because a security token was missing.

If this occurred unexpectedly, please inform the administrator and describe the action you performed before you received this error."
i also get the same message, so what i do is upload pics one at a time....

can you link me to a good seller of these tubes?
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