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Old 19th August 2012, 06:54 AM   #31
Charm is offline Charm  Russian Federation
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6P3 (6?3) Beam Power Tetrode | GLOWBUGS TIMES
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Old 11th May 2017, 06:28 PM   #32
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Because I can't read the datasheet, does anyone have the corresponding Vademecum sheet with a proper triode-connected curve?
I am running the 6P3S in triode mode push pull at 340 volt Vb and a cathode bias (resistor of 470 ohm) at 30 volt.
Wa = 20 watt. Filament is 6.3v ac. From decrypting the datasheet shown earlier in the topic, there is only mention of 250 V.
I had the amplifier running at a lower Vb of 320 volt for a few years; the tubes really kept well all that time. So above 250 v is possible on the long run.
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Old 11th May 2017, 06:34 PM   #33
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Because I can't read the datasheet, does anyone have the corresponding Vademecum sheet with a proper curve?
I am running the 6P3S in triode mode push pull at 340 volt Vb and a cathode bias (resistor of 470 ohm) at 30 volt.
Wa = 20 watt. Filament is 6.3v ac. From decrypting the datasheet shown earlier in the topic, there is only mention of 250 V.
I had the amplifier running at a lower Vb of 320 volt for a few years; the tubes really kept well all that time. So above 250 v is possible on the long run.
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Old 11th May 2017, 09:25 PM   #34
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Here's an english data sheet:

6P3C
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Old 12th May 2017, 05:50 PM   #35
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Thanks rotaspec.
So I am maybe underrating the tube in mA (35 mA) and overrating it in voltage. I recalculated the Wa, it is 10 watt. So nothing to worry about in my opinion.
In class AB it can be higher.
The second grid sees more than in the specsheet for pentode use, but there is no triode data in this sheet.

For other pentodes, like 5881, triode operating data is given. The 5881 allows the screen of the triode strapped tube to be operated above the normal operating voltage of the anode (400V). Looking at the triode 5881 sheet, the triode operating point in class AB1, push-pull, like I have of 310Va, -30Vg, 33 mA, is exactly found here. I can surely go a little bit higher I guess.

5881 tungsol.pdf

Interesting. [There are more resembances between tubes than I thought, if one disregards the high power region.]
This application of the 6p3s is for replacing the original 5881 tubes in a Yaqin push-pull amplifier.
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Old 12th May 2017, 09:33 PM   #36
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I have just been assembling a Dynaco ST-70 clone, which is normally running EL34 outputs in ultra-linear.
Initial testing was done with 6P3S tubes instead, as I didn't want to risk my NOS Mullard EL34s. Bias was set to give 40mA cathode current, and the B+ settled at 430v, giving 420v across the tubes, and similar on the G2.
Close to 18W dissipation and they were quite happy, so your figures are conservative by comparison.
I ran the amp like that for several hours with no adverse effect on the tubes (no red plates even in the dark).

My experience with Russian 6P3S tubes so far indicates that the later production ones, and also the 6P3S-E will operate above their data sheet ratings with ease. The earlier ST-shaped bottle ones (and the Chinese clones) are not so forgiving.

Here's a triode trace I did:

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Old 13th May 2017, 07:01 AM   #37
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I have used 6P3S-E for many years with 450 V / 40 mA (UL-PP, 6k6, 35 W) without any problems.

Last edited by artosalo; 13th May 2017 at 07:03 AM.
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Old 13th May 2017, 08:01 AM   #38
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Another element of praise for this Russian tube is build consistency. On my (ex-military) tube tester, the four I bought were 2200, 2100, 2100, 2100.
In comparison the chinese 5881 were 1650, 1700, 1750, 1600. So more all over the place. And they became black within two years, running at 80 mA in UL-PP.

At my low operating point the sound is quite relaxed. The Yaqin has almost no overshoot.
I have tried reducing the filament voltage: that also makes a more relaxed sound.
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