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Old 6th January 2009, 08:45 AM   #1
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Location: Denmark
Default SE solution wanted

Hey

I just get 2 NOS transformers with following data:

Type: SE
Primary: 7k + 40% screen
Sec: 15, 8, 5 and 3,2 ohm
Current 50-60 mA
Power: 5 - 6 watt

I was looking at a g2 driven PL36 solution. Maby running at 300 V +B, but I am not sure that is the right solution.

Are there any who have a better solution

Regards

Benny
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Old 6th January 2009, 09:57 AM   #2
Fuling is offline Fuling  Sweden
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I would try PL36 in triode mode with 300V p-k or 807 UL

Edit: That 15 ohm tap might be useful for cathode feedback!
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Old 6th January 2009, 10:02 AM   #3
45 is offline 45  Italy
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I personally don't like the g2 drive: Too much stress for the valve, which is reflected on the sound......
With your transformer, I would go for a ECL/PCL86 amplifier.
The output power, with 270 anode voltage and 35-37 mA (anode + screen grid) current, would be close to 4W (in UL mode).

Cheers,
45
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Old 6th January 2009, 02:57 PM   #4
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What impedance are the speakers you will be using, 8 ohm?
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Old 6th January 2009, 05:58 PM   #5
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Hey

sorenj07: Yes 8 ohm.

Regards

Benny
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Old 6th January 2009, 07:05 PM   #6
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If I were you, I would connect your 8 ohm speaker to the 15 ohm tap, making your OPT effectively 3.73K. This would let you use a 2A3 type tube. Or, if you are more budget conscious, you can use one of the "fake" 2A3's like I have designed here:

New SET Amp

Or you could use an EL84 in SET for about 3 watts as well. They're a lot easier to drive. Or you could get creative and use a 6S19P, like I was discussing here:

http://www.diytube.com/phpBB2/viewto...ighlight=6s19p

Or any number of tubes. It's up to you... choose wisely

Got any pics of your OPTs by any chance?
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