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Old 8th May 2006, 05:34 AM   #11
Tyimo is offline Tyimo  Hungary
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Thank a lot PHN!


I'm planning to build this too!

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Tyimo
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Old 8th May 2006, 07:41 AM   #12
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Tyimo,

That circuit used to be on the Svetlana website, now down
I'm using it as a pre-amp stage directly feeding a SE 2A3. Sounds very nice, though it doesn't have enough drive to full power. But who cares?
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Old 8th May 2006, 12:45 PM   #13
phn is offline phn  Sweden
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Another interesting tube to look into is the C3g.

I can't help you with schematics. But it's a great tube. Ideal for a phono headamp. Then add the cool-looking AZ50 rectifier. It's as much overkill as the GZ34 for an E80F pre. Like if DIY has anything to do with restraint.

Simpleton,

Would you like to elaborate on not enough drive? This, as mentioned, is my first tube project, and only because I haven't found any other alternative. I would much rather buy a vintage preamp and tweak it. (I'm a bricoleur rather than a DIYer.) But vintage preamps tend to be anything but great. Or they are ridiculously overprised like the Marantz Model 7.

And I do have some issues with the gain. 1:10 would have been more to my liking. I have a vintage amp and it only needs about 500mV.
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Old 8th May 2006, 01:50 PM   #14
Tyimo is offline Tyimo  Hungary
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Default EF86 line amp

Hi and thanks for the help!

I would like to use the preamp with ca. +100V. Could you tell me how big will be the voltage gain and the max RMS output voltage?
I need "only" 15 V RMS, so I tought the 100V would be enough.

One more: Could you suggest a good, but simple PSU for the amp?

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Tyimo
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Old 8th May 2006, 02:43 PM   #15
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Phn,

By enough drive i mean that it puts around 30Vrms when i need some 40Vrms to full 3W output from the 2A3 (this from memory, it's been some months)

Tyimo,

I can't make the calculation right now, but you'll get more than 15V out at 100V, don't worry
For a PSU, get a diode bridge rectifier, 2 transfomers, one 220/12V and teh other 220/6V, connected back to back (220V/6v-12V/220V), plus 440uF of capacitance and you're done with a little over 100V (maybe 120~130V or so). Shouldn't be too noisy.
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Old 8th May 2006, 06:46 PM   #16
Tyimo is offline Tyimo  Hungary
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Thaaanks Simpleton!!!

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Tyimo
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Old 8th May 2006, 07:07 PM   #17
phn is offline phn  Sweden
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Thanks, Simpleton.
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Old 16th May 2006, 06:58 AM   #18
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the Shure M65 is a pretty simple preamp, it can be run in either line or RIAA mode

http://www.audioorigami.co.uk/Floppy...pyDIYMotor.htm
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Old 19th May 2006, 04:37 PM   #19
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Your design looks good to me.
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Old 20th May 2006, 06:23 AM   #20
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whoops - wrong link

here it is...

http://www.diytube.com/phpBB2/viewtopic.php?t=968
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