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Old 15th July 2004, 07:35 AM   #1
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Default EL34 SE amp schematics

Hi!

I would like to build a EL34 single ended amp. Anyone done that? A schematic would be apriciated
The thing is, I wanted to build a PP amp but i got 2 output transformers(for SE aplication), 2 ECC83 nad 4 EL34 for free. So i tought why not try to bo a SE EL34. I know it's a bit unusuall.

Robi
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Old 15th July 2004, 09:46 AM   #2
MIKET is offline MIKET  United States
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Default Here you go

http://www.geocities.com/agalavotti/a1eng.htm
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Old 15th July 2004, 09:58 AM   #3
navin is offline navin  India
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the link did not work. any ideas?
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...still looking for the holy grail.
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Old 15th July 2004, 10:18 AM   #4
MIKET is offline MIKET  United States
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Default Here is another link

Here is a great construction article:
http://www.lundahl.se/claus_b_se.html
I have bought the LL1664/80mA transformers from the article for my 300B SE and they are sweet.

As for the other site, Aparently this site will be back up soon
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Old 15th July 2004, 01:02 PM   #5
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Default El34 SE

In the "How to" section of Angela.com. There is a schematic.
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Old 15th July 2004, 03:04 PM   #6
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Thanks guys!

What do you think abaut this one?

http://www.hiendfi.com/modules.php?n...ticle&artid=90

Robi
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Old 15th July 2004, 04:03 PM   #7
The End is offline The End  Poland
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This is very good construction amplifier.
Pozdrawiam wszystkich rodaków
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Old 15th July 2004, 09:48 PM   #8
MIKET is offline MIKET  United States
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Default Schematic apears to have an error

Quote:
Originally posted by Robi Medvesek
Thanks guys!

What do you think abaut this one?

http://www.hiendfi.com/modules.php?n...ticle&artid=90

Robi

Robi,
From what I know about SE amp the Plate of the EL34 should be hooked up to the transformer as shown. R6 and R7 should be conected to the battery (400V) and not the tube side of the transformer.
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Old 16th July 2004, 08:54 AM   #9
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Miket,

R7 is conected correctly- for triode mode. If it would be direcli to suply then it would be pentode mode (I think).
Abaut R6 I don't know. In my opinion, when there is no signal it doesn't matter much because the resistance of the transformer is wery low. I'll have to ask Bojan abaut that. But I think it's correct.


Thanks,
Robi
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