Anything wrong with this design?

[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.

Let me know if this will work.

Thanks a lot!

 

[fdegrove]

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,

 

[FrancoB]

Ok, now I want to use a 6SN7 in stead of the 6SL7. What changes would the tube gurus here suggest?

Thanks a lot!

 

[Andrewbee]

If you are looking for 6c33 designs then here is another


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


Andrew

 

[Sch3mat1c]

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

Tim