Blasphemy, I'm sure

Sch3mat1c · 16th October 2007, 06:08 AM

Link here: http://webpages.charter.net/dawill/t..._Compound.html

Mwa Ha Ha, a class D tube amplifier!

Tim

Geek · 16th October 2007, 07:23 AM

Hey, super!

What about making the output SRPP or a CCS in place of that big ugly resistor?

Cheers!

SY · 16th October 2007, 11:10 AM

Very clever and impressive! It reminds me of some stuff that Crowhurst was doing in the 60s.

Dull old me would have done something very conventional and boring with 6GF7 in p-p or something like that. Yawn.

poynton · 16th October 2007, 01:51 PM

Quote:

Originally posted by Sch3mat1c
.............. a class D tube amplifier! .............

An excellent project. Should be "Tube Amp of the Year!"

Andy

Sch3mat1c · 16th October 2007, 02:30 PM

Quote:

Originally posted by Geek
Hey, super!

What about making the output SRPP or a CCS in place of that big ugly resistor?

Cheers!

SRPP would be half bridge, which would be two 38HE7 stacked, using the damper diodes antiparallel to clamp flyback. Essentially what I have now, in parallel with its inverse. It's harder to drive. Push-pull is easier to pull off, and equivalent in operation, however. Too bad I only have the one 38HE7.

You're right, a CCS could be used, about doubling AC output. But it's hard to make tube CCsources, and I don't have a 200mA * 160V tube that could still be used in the contest.

Tim

Tom Bavis · 16th October 2007, 03:36 PM

Quote:

Originally posted by Sch3mat1c

Too bad I only have the one 38HE7.

Tim

Somebody finally found a use for those things! Good thing you haven't published your address - you'd be carpet bombed with 38HE7s and 53HK7s...

Geek · 16th October 2007, 04:03 PM

Hi Tim,

Quote:

Originally posted by Sch3mat1c
But it's hard to make tube CCsources, and I don't have a 200mA * 160V tube that could still be used in the contest.

Right!

For some reason I thought you were developing this beyond the contest, but it ain't over.

Cheers!

16th October 2007, 06:08 AM	#1
Sch3mat1c diyAudio Member Join Date: Jan 2003 Location: Milwaukee, WI	Blasphemy, I'm sure Link here: http://webpages.charter.net/dawill/t..._Compound.html Mwa Ha Ha, a class D tube amplifier! Tim __________________ See my Electronics webpage -- the home of Vacuum Tube Drag Racing. The key to being a successful Audiophile: "I reject your reality and substitute my own!"

16th October 2007, 11:10 AM	#3
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	Very clever and impressive! It reminds me of some stuff that Crowhurst was doing in the 60s. Dull old me would have done something very conventional and boring with 6GF7 in p-p or something like that. Yawn. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

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16th October 2007, 07:23 AM	#2
Geek diyAudio Member Join Date: Sep 2004	Hey, super! What about making the output SRPP or a CCS in place of that big ugly resistor? Cheers!

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