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-   -   6S3P Tube for cathodyne application (https://www.diyaudio.com/forums/tubes-valves/377468-6s3p-tube-cathodyne-application.html)

Mercury99 25th September 2021 05:15 PM

6S3P Tube for cathodyne application
 
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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?

artosalo 25th September 2021 05:57 PM

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I have good experience with 6S3P-EV as RIAA. The attached schematic works really fine at LT Spice.

Mercury99 25th September 2021 07:08 PM

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.

Sorento 25th September 2021 10:28 PM

Quote:

Originally Posted by Mercury99 (https://www.diyaudio.com/forums/tubes-valves/377468-6s3p-tube-cathodyne-application-post6796864.html#post6796864)
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 ...

artosalo 26th September 2021 08:20 AM

1 Attachment(s)
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.

artosalo 26th September 2021 12:52 PM

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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.

PFL200 26th September 2021 02:26 PM

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Quote:

Originally Posted by Sorento (https://www.diyaudio.com/forums/tubes-valves/377468-6s3p-tube-cathodyne-application-post6797135.html#post6797135)
incidentally, european type EC86 is the same tube, search for it ...

I wouldn't call them the same (pinout is different too).

rongon 26th September 2021 02:57 PM

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...

artosalo 26th September 2021 03:01 PM

Op wants:
Quote:

6S3P Tube for cathodyne application
RIAA does not help much for that need.

rongon 26th September 2021 03:25 PM

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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