SE solution wanted

Hojvaelde · 6th January 2009, 08:45 AM

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

Fuling · 6th January 2009, 09:57 AM

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!

45 · 6th January 2009, 10:02 AM

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

sorenj07 · 6th January 2009, 02:57 PM

What impedance are the speakers you will be using, 8 ohm?

Hojvaelde · 6th January 2009, 05:58 PM

Hey

sorenj07: Yes 8 ohm.

Regards

Benny

sorenj07 · 6th January 2009, 07:05 PM

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?

6th January 2009, 08:45 AM	#1
Hojvaelde diyAudio Member Join Date: Jan 2005 Location: Denmark	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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6th January 2009, 09:57 AM	#2
Fuling diyAudio Member Join Date: Aug 2001 Location: Sweden (Mora)	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!

6th January 2009, 10:02 AM	#3
45 diyAudio Member Join Date: Dec 2008 Location: United Kingdom	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

6th January 2009, 02:57 PM	#4
sorenj07 diyAudio Member Join Date: May 2006	What impedance are the speakers you will be using, 8 ohm?

6th January 2009, 05:58 PM	#5
Hojvaelde diyAudio Member Join Date: Jan 2005 Location: Denmark	Hey sorenj07: Yes 8 ohm. Regards Benny

6th January 2009, 07:05 PM	#6
sorenj07 diyAudio Member Join Date: May 2006	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?