I can report to all here that I had this amp design prototyped for myself and recently sent to Asian Audiophile magazine for review and listen and get thier comments on the sound. They said they were able to clearly hear the character of the various preamps they had used it with. 🙂 . Excellent!
What have some of the DIY builders here put into their projects -- money-wise (not counting labor)? Complete with the chassis, HSinks, PS, misc hardware and input/ouput sockets, loaded pcb, OP stage and all?
THx-Richard
What have some of the DIY builders here put into their projects -- money-wise (not counting labor)? Complete with the chassis, HSinks, PS, misc hardware and input/ouput sockets, loaded pcb, OP stage and all?
THx-Richard
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I have to admit I haven’t yet touched the pcbs focusing on rebuilding my Quad 988 ,s (success) and now
Rebuilding the Panasonic Strain gauge completely and retipping it with a boron/ micro-ridge
Huge learning curve
Regards
David
Rebuilding the Panasonic Strain gauge completely and retipping it with a boron/ micro-ridge
Huge learning curve
Regards
David
I am back in Bangkok, Thailand and I got to listen to the amplifier. I never heard such good pin point imaging and same for the depth... front-back layering. Wow. Amazing.
So realistic sounds. A challenging DIY project but SOTA when you are finished. The combination of CFA, high SR, ultra low distortion and especially that the distortion doesn't change with load Z or freq or power... makes for such accurate imaging and details in reproduction.
You can easily hear the individual differences in sound character of several preamps with this PA.
THx-RNMarsh
So realistic sounds. A challenging DIY project but SOTA when you are finished. The combination of CFA, high SR, ultra low distortion and especially that the distortion doesn't change with load Z or freq or power... makes for such accurate imaging and details in reproduction.
You can easily hear the individual differences in sound character of several preamps with this PA.
THx-RNMarsh
.
By coincident today I was listening to my 100W CFA amps(three channels in each amplifier) driving ORION loudspeakers. The source was one of the best dacs, Benchmark DAC2, directly connected to the analog electronic crossovers, acting as a preamp too.
I can say I am very satisfied with the sound, filling very close to live performance (classical music, as I go on classical concert only and could compare with it only).
I can say I am very satisfied with the sound, filling very close to live performance (classical music, as I go on classical concert only and could compare with it only).
Attachments
I have found some silk screen errors on the 200W CFA VMOSFET printed board, rev. 1.3.2 .
I am so sorry about that, but there no layout errors, just be careful wile inserting some of this components, list below:
200W CFA VMOSFET rev. 1.3.2
Silk scree errors:
D21 rename to D8 and revers
D20 rename to D5 and revers
D23 rename to D20 and revers
D5 rename to D23
D22 rename to D21 and revers
D8 rename to D22
Q9 rename to Q5
Q7 (on the left) rename to Q9 2SC3503
Attached corrected silk screen (board rev 1.3.2b)
I am so sorry about that, but there no layout errors, just be careful wile inserting some of this components, list below:
200W CFA VMOSFET rev. 1.3.2
Silk scree errors:
D21 rename to D8 and revers
D20 rename to D5 and revers
D23 rename to D20 and revers
D5 rename to D23
D22 rename to D21 and revers
D8 rename to D22
Q9 rename to Q5
Q7 (on the left) rename to Q9 2SC3503
Attached corrected silk screen (board rev 1.3.2b)
Well done, good looking and good sounding, superb !!🙂
That is how I feel using the Slewmaster with a CFA front end on Spendor S100 speakers !
That is how I feel using the Slewmaster with a CFA front end on Spendor S100 speakers !
I don't have any board at the moment.
Haw many boards do you need? This week, I am out of my house, when I am back I can start new group buy.
Damir
No activity in this thread for some time.
Did anybody build 200W version yet? I am very interested about result and the sound quality.
If there interested parties for 200W version I could start new PCB batch, pleas put your interest here.
Best wishes in this Year to all.
Damir
OK, but I need minimum 10 boards order so here I start the list.
tjencks 6 pcs 200W amp boards
