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Old 26th May 2012, 09:12 AM   #1
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Default PSE 2a3 operating points?

I have a pair of Audio Note TRANS-152 OPTs which are gapped for 90mA and 2.5K into 8 ohms. I was thinking of 300b but revised this idea to PSE 2a3s. I intend to use the biplate versions, or the biplate Russian 6C4C, which is a 6B4G.

The 6B4G data sheet states 250v and 60mA in SE, class A

http://www.mif.pg.gda.pl/homepages/f...127/6/6B4G.pdf

It also states 325v and 40mA in PP, class AB1

I'd like to get somewhere around 45mA each tube, but with these biplates how high could I take the Anode-Cathode voltage? Any suggested operating points? Anybody tried out 2a3 in PSE?

Andy
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Old 26th May 2012, 10:39 AM   #2
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Hi Andy,

For PSE I would stick with the max plate voltage of 250V. Since your OPT is gapped for 90mA I would run the tubes at 45mA each.

Best regards

Thomas
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Old 26th May 2012, 10:55 AM   #3
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250v and 2 x 45mA gives 22.5w anode dissipation so just possible. I'd like a bit more. I have Mark Audio Alpair 10 fullrange speakers. 2a3 PP drives them beautifully! They're about 290v A-K and 45mA

andy
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Old 26th May 2012, 02:51 PM   #4
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Hi Andy,

if PP drives them nicely why not stick to PP then?

Thomas
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Old 26th May 2012, 03:27 PM   #5
Bigun is offline Bigun  Canada
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Quote:
Originally Posted by andyjevans View Post
I intend to use the [...] Russian 6C4C
[...]with these biplates how high could I take the Anode-Cathode voltage?
I have some of these Russian tubes. The data sheet says the max is 360V (attached).

I put all 10 of mine, in turn, into a mono-block running at less than this and a couple of them had some initial 'pops' until they settled down. Maybe you want to burn-them in gently before exposing them to full B+ if you are planning to use a high voltage.
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File Type: pdf 6S4S_datasheet.pdf (63.1 KB, 29 views)
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