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Old 10th March 2005, 09:00 PM   #1
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Default Anything wrong with this design?

Please comment. Original design is from jogis-roehrenbude.de But there's too much gain to drive it with a preamp. I stripped the first stage of the original design.

Let me know if this will work.

Thanks a lot!
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Old 10th March 2005, 10:28 PM   #2
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Hi,

If R1 is meant as a gridstopper it should be positioned as close to the grid of the 6SL7 as possible.

As it is now it will attenuate the incoming signal slightly, I doubt you'd want that.

The B+ voltage probably will have risen a little but that shouldn't be an issue in practice.

Other than that, it should work just fine.

Ideally, that's what I'd do anyway, I'd drive the 6C33-C from a 6SN7GTB in SRPP and ommit the cathode bypass cap if I'd be using a line level preamp with gain to spare.

Cheers,
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Old 26th April 2005, 10:46 PM   #3
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Ok, now I want to use a 6SN7 in stead of the 6SL7. What changes would the tube gurus here suggest?

Thanks a lot!
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Old 27th April 2005, 02:39 AM   #4
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If you are looking for 6c33 designs then here is another


http://www.audiopro.co.jp/foxbatk.jpg


Andrew
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Old 27th April 2005, 06:50 AM   #5
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Default Re: Anything wrong with this design?

Quote:
Originally posted by FrancoB
Please comment. Original design is from jogis-roehrenbude.de But there's too much gain to drive it with a preamp. I stripped the first stage of the original design.

Too much gain: add attenuator (volume control or fixed divider) or use lower gain tube. 6SN7 was mentioned, that'll work. You'll want a bit more current, so smaller resistors in the SRPP stage will be needed. <Glances around> I'll let someone else figure exactly what values are needed...or pick 'em off something existing... /ducks out of thread

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