6W Self Inverting 6BQ5 Amp - Page 3

hillly · 23rd April 2005, 10:53 PM

What are the actual advantages of the CCS approach? It's seems an more elegant way of biasing but as you still can't bypass the cathode to ground it would appear that you still suffer the problems caused by local feedback.

Sch3mat1c · 24th April 2005, 09:39 AM

Well yeah, that's kind of what you have to accept when you don't drive the other tube at all.

Tim

Sparky OR · 27th April 2005, 03:57 AM

So one channel doesn't sound too bad. But I should use a better quality OPT. And something besides plexiglass for a chassis. (It was quick and easy). There is a fair amount of hum. I used a 3w 25ohm balance pot over the cathode resistor. I went to 6AV6 driver tube, moved the volume control to 100k at the input, removed the tone control. (still haven't gone to CCS yet)
But what I'm really wondering is, does this kind of circuit stand a chance of being an inexpensive way to get around crossover distortion? I like the "aliveness" of an my SE amp which is 6BQ5/6EU7. I'm thinking of trying EL34's in a similar configuration.
Comments? At the moment the 6W amp doesn't seem to have the quite the power of the SE amp. And sonic improvements would be easily possible with the SE amp by upgrading it's OPT's and PS also.
Thanks
Jim
Anyone in the Eugene OR area want to get together to audition projects, do a swap meet or kick around ideas over a homebrew?

Sch3mat1c · 27th April 2005, 06:46 AM

Quote:

Originally posted by Sparky OR
But what I'm really wondering is, does this kind of circuit stand a chance of being an inexpensive way to get around crossover distortion?

Huh? Crossover distortion isn't an issue until deep class AB. Very deep, if NFB is used.

Tim

24th April 2005, 09:39 AM	#22
Sch3mat1c diyAudio Member Join Date: Jan 2003 Location: Milwaukee, WI	Well yeah, that's kind of what you have to accept when you don't drive the other tube at all. Tim __________________ Seven Transistor Labs Projects and Resources

27th April 2005, 03:57 AM	#23
Sparky OR diyAudio Member Join Date: Jun 2003 Location: Eugene, Oregon	So one channel doesn't sound too bad. But I should use a better quality OPT. And something besides plexiglass for a chassis. (It was quick and easy). There is a fair amount of hum. I used a 3w 25ohm balance pot over the cathode resistor. I went to 6AV6 driver tube, moved the volume control to 100k at the input, removed the tone control. (still haven't gone to CCS yet) But what I'm really wondering is, does this kind of circuit stand a chance of being an inexpensive way to get around crossover distortion? I like the "aliveness" of an my SE amp which is 6BQ5/6EU7. I'm thinking of trying EL34's in a similar configuration. Comments? At the moment the 6W amp doesn't seem to have the quite the power of the SE amp. And sonic improvements would be easily possible with the SE amp by upgrading it's OPT's and PS also. Thanks Jim Anyone in the Eugene OR area want to get together to audition projects, do a swap meet or kick around ideas over a homebrew? __________________ Wish I'd studied this stuff with as much interest 30 years ago!

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23rd April 2005, 10:53 PM	#21
hillly diyAudio Member Join Date: Apr 2005 Location: Adelaide, South Australia	What are the actual advantages of the CCS approach? It's seems an more elegant way of biasing but as you still can't bypass the cathode to ground it would appear that you still suffer the problems caused by local feedback.