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6S3P Tube for cathodyne application
6S3P Tube for cathodyne application
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Old 25th September 2021, 05:15 PM   #1
Mercury99 is offline Mercury99
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Default 6S3P Tube for cathodyne application

The Russian 6S3P-EB tube seems to be a good candidate for Cathodyne PI. It has high gain and low plate operating voltage to allow direct connection. See charts attached.

However, I could not find any reference to this application. In fact, I can't find many applications for this tube on the Internet. Are there any reasons this tube is not popular for audio? Availability? Microphonic? Poor sounding?
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File Type: jpg 6S3P1_page-0003.jpg (248.2 KB, 141 views)
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Old 25th September 2021, 05:57 PM   #2
artosalo is offline artosalo  Finland
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I have good experience with 6S3P-EV as RIAA. The attached schematic works really fine at LT Spice.
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File Type: jpg 6S3P-EV cathodyne.jpg (53.0 KB, 139 views)
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Old 25th September 2021, 07:08 PM   #3
Mercury99 is offline Mercury99
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HI, artosalo, thanks for the reply. How about two tubes direct connected as Morgan Jones showed in his book? I assume we can get more gain than E88CC used in the Bevois Valley. I am not sure the THD will be better.
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Old 25th September 2021, 10:28 PM   #4
Sorento is offline Sorento  Europe
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Quote:
Originally Posted by Mercury99 View Post
The Russian 6S3P-EB ... In fact, I can't find many applications for this tube on the Internet. Are there any reasons this tube is not popular for audio? Availability? Microphonic? Poor sounding?
maybe because its a single triode rather than a twin ... ?
incidentally, european type EC86 is the same tube, search for it ...
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Old 26th September 2021, 08:20 AM   #5
artosalo is offline artosalo  Finland
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Quote:
How about two tubes direct connected...
That is possible, but direct connected amp/cathodyne is a compromise because the voltage amplifying stage biases the phase inverter.
However it works fine if the output stage does not require very high drive voltage.
This could be one circuit to start with.
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File Type: jpg 6S3P-EV amp_cathodyne.jpg (53.4 KB, 99 views)
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Old 26th September 2021, 12:52 PM   #6
artosalo is offline artosalo  Finland
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As a reference here is ac-couple version. With 280 V as +Ub it can deliver 1.5-times (30 Vrms) bigger drive voltage with lower THD.
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File Type: jpg 6S3P-EV amp_cathodyne_ac.jpg (46.2 KB, 80 views)
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Old 26th September 2021, 02:26 PM   #7
PFL200 is offline PFL200  Netherlands
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Quote:
Originally Posted by Sorento View Post
incidentally, european type EC86 is the same tube, search for it ...
I wouldn't call them the same (pinout is different too).
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File Type: png 6С3П-ЕВ.png (31.9 KB, 72 views)
File Type: jpg EC86.jpg (651.4 KB, 8 views)
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Old 26th September 2021, 02:57 PM   #8
rongon is online now rongon  United States
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Location: Across the river from Rip's big old tree...
6S3P Tube for cathodyne application
6S3P-EV has been used as input stage for RIAA phono preamps. Member kevinkr used it in the early iterations of his 'Muscovite' designs. Search for it...
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Old 26th September 2021, 03:01 PM   #9
artosalo is offline artosalo  Finland
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Op wants:
Quote:
6S3P Tube for cathodyne application
RIAA does not help much for that need.
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Old 26th September 2021, 03:25 PM   #10
rongon is online now rongon  United States
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Location: Across the river from Rip's big old tree...
6S3P Tube for cathodyne application
This is true.
However, you can see how that particular tube type has been used by someone who knows what they're doing.
Just data points to work from. That is all.
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