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50w Single-Ended BAF2015 Schade Enabled
50w Single-Ended BAF2015 Schade Enabled
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Old 21st March 2018, 11:45 AM   #521
miklos is offline miklos  Hungary
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Maurice Chevalier
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Old 21st March 2018, 02:55 PM   #522
vdi_nenna is offline vdi_nenna  United States
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50w Single-Ended BAF2015 Schade Enabled Send a message via Yahoo to vdi_nenna
C'nice! My French is terrible, but you get the idea.
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Old 22nd March 2018, 03:33 PM   #523
Soundhappy is offline Soundhappy  France
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@ Mr Pass and Diyers
Thank You very much for superb Diy project, kind words and help in SE amp explorations

I do play more music with Schade 50W this evening and night.
First observations: start at power on with progressive up current rise for about -2 minute's.
Speakers are silencious without music.
I am happy camper with big heat sinks at 3A2 of the bias.
Time to try A, B, C, D taps of CCS and hear & feel subtle different harmonic distorstion signatures and phase.

Graph and schematic courtesy of NP Click the image to open in full size.
Get two tube preamps and one solid state to try
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Old 22nd March 2018, 05:03 PM   #524
Michael Rothacher is offline Michael Rothacher  United States
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50w Single-Ended BAF2015 Schade Enabled
Liftoff!
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Old 22nd March 2018, 07:25 PM   #525
Dennis Hui is online now Dennis Hui  Canada
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50w Single-Ended BAF2015 Schade Enabled
I don't know Christophe...that looks too neat and tidy.

Cheers,
Dennis
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Old 22nd March 2018, 08:27 PM   #526
WalterW is offline WalterW  Netherlands
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50w Single-Ended BAF2015 Schade Enabled
Nice Christophe! I see more exotic components, which I don't recognize, on the left PCB.
What IXYS are you using as replacement for the 2SK77B?
Are you listening Mono right now?
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Old 24th March 2018, 08:05 PM   #527
Soundhappy is offline Soundhappy  France
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Quote:
Originally Posted by Michael Rothacher View Post
C'est magnifique!
I was simply inspired by Mr Rothacher Diy builds perfection
Please any news about 2SK77B new MR amplifier and compare audio test's to the Schade 50W can be superb fun ?
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Old 24th March 2018, 08:07 PM   #528
Soundhappy is offline Soundhappy  France
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Quote:
Originally Posted by Dennis Hui View Post
I don't know Christophe...that looks too neat and tidy.

Cheers,
Dennis
That only amp prototype
Cheers
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Old 24th March 2018, 08:22 PM   #529
Soundhappy is offline Soundhappy  France
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Quote:
Originally Posted by WalterW View Post
Nice Christophe! I see more exotic components, which I don't recognize, on the left PCB.
What IXYS are you using as replacement for the 2SK77B?
Are you listening Mono right now?
Thanks Walter
is two resistors with big ceramic core to keep them temperature stable
not far from the hot puck mosfet.
Oh it's all precisely like on the Papa schematic with IXFN140N20P.
Yes prototype is one channel only.
I get two bench psu 60 V | 5A max if connected in series just perfect for mono.
My thrue exotic component are huge 230V : 230V galwanic separation transformer.
Greetings
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Old 24th March 2018, 09:11 PM   #530
Soundhappy is offline Soundhappy  France
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Default 2SK77B triode simulation with IXFN Schade Feedback

Few impresions after preamp's and taps test.

Jfet buffer 25 Ohm's source impedance or similar for this amplifier is the KEY.

First time I try passive Autoformer Volume Control AVC attenuator with this prototype. Clean sound.
After that i connect them to the solid state preamp and was BIG motor boat brrr bada boom.
One resistor value 50R ~ 500 R connected to the hot of the RCA and GRN and no more problem. All OK
It was delicious music with tube preamp at night.
~ 28V from IXFN drain to GRN show me +3A bias.
I solder 2 order or 3 order distortion switch between C and D tap's.
Difference is clearly audible
2 natural relaxed tone
3 nice dynamic tone
get the two options is COOL for match with specyfic audio source, preamp and drivers.
Great experience
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