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Old 5th October 2018, 06:51 PM   #61
Pascal Nguyen is offline Pascal Nguyen  Australia
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Join Date: Sep 2016
Location: Sydney
Quote:
Originally Posted by juanitox View Post
Eureka , now it is as undersandable as a ZM circuit !
Hope you would not running nude !


Quote:
Originally Posted by Samuel Jayaraj View Post
U3 Drain is connected to GND and Supply Rail at the same time?
Yes, it does for having a reversal effect in H2 generation.


Quote:
Originally Posted by Zen Mod View Post
well, not to ZM

Juanitox meant that he will polish your circuit with sand paper.


Cheers all
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Old 5th October 2018, 11:34 PM   #62
Chul is offline Chul  South Korea
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Join Date: May 2003
Location: Pusan Korea
LateSit
Hi Pascal I think the actual work you are doing is not the same as the circuit...
Maybe I am too stupid to follow and good luck with your test..!
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Old 9th October 2018, 01:39 AM   #63
Pascal Nguyen is offline Pascal Nguyen  Australia
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Join Date: Sep 2016
Location: Sydney
Quote:
Originally Posted by Pascal Nguyen View Post
Mondayitis? Not really, back to 6J1P driver for a final decision.
In a crudely state this EBay preamp is full of noise from 12Vac doubler.
Her plate voltage and current are governed only by a resistor, no hated here, just seen it as an unpolished opal.
Will combined with DN2540 as CCS and perhaps another EBay order for an 6J1P preamp to be modified as buffer but within Mr Pass philosophy “simple and elegant” .

Received my second 6J1 kit, then a quick and dirty modification happened for a buffering purpose (google search “6J1 site:www.diyaudio.com”

Preliminary measurements taken for conceiving a LateSit version 3, will be interesting due to direct negative H2 generation from tube, then Sit and Late mosfet have to be non reversal to have negative H2 output.

Please note, the LateSit is my long term project for personal education and entertainment.

The 6J1 preamp and buffer are behaving within normal limit of an Au $9 each, delivered, please find attached my measurements taken.

Cheers


.
Attached Images
File Type: jpeg 5F531729-2DF9-4CAD-AE82-577E97AC244D.jpeg (786.7 KB, 190 views)
File Type: jpeg 23FDB8AD-A534-4805-ABB5-350A0E7B31E9.jpeg (832.7 KB, 186 views)
File Type: jpeg 986DD757-4280-4F97-B2A6-AABF720D9513.jpeg (815.8 KB, 182 views)
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Old 11th October 2018, 01:09 PM   #64
Pascal Nguyen is offline Pascal Nguyen  Australia
diyAudio Member
 
Join Date: Sep 2016
Location: Sydney
Default Reference Amplifier

So far I am successfully “LateSitted” the DefiSit(C) up to its transformer gain stage (without the pair K170 & J74).

The result is very impressive, due to high transconductance of the lateral BUZ905D and very low distortion of 1:4 transformer ( wire gain, hihi, I realised it when I built my Zeus amp).

Preliminary measurement recorded as a reference for later comparison with difference input gain and buffering driver circuit.

Clipping at 5Vp-p input, interesting at 4Vp-p input, the output H2 shifted from negative to positive phase.
Attached Images
File Type: jpeg F15FD428-1208-4DCB-BA39-2407C9753703.jpeg (931.7 KB, 137 views)
File Type: jpeg 7F5B6FBC-8A6B-46F7-A8DD-282AED491427.jpeg (920.7 KB, 129 views)
File Type: jpeg 73EF8B09-6FBF-4E34-87FB-6053979BC6EC.jpeg (884.7 KB, 31 views)
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Old 11th October 2018, 01:19 PM   #65
Pascal Nguyen is offline Pascal Nguyen  Australia
diyAudio Member
 
Join Date: Sep 2016
Location: Sydney
Default Preliminary test 6J1 buffer and preamp

The result is very poor, perhaps it does need a regulated and low noise power supply, the built in 12v tripler contributed a lot of noise to the circuit.
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File Type: jpg 10225C1C-32F8-41FA-8D9B-822CC0BAF911.jpg (873.1 KB, 44 views)
File Type: jpeg 9C726CF2-9A3D-4242-9807-C375608DA09A.jpeg (880.4 KB, 42 views)
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Old 12th October 2018, 10:36 AM   #66
Pascal Nguyen is offline Pascal Nguyen  Australia
diyAudio Member
 
Join Date: Sep 2016
Location: Sydney
Default Chassis Day

The wicked fan cooling is working extremely well, able to sink 150W for both channels with minimum fan speed.

Only problem is the height is 1cm taller than the U3 case.
Well, the copper plate has to go under the chassis!
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Old 13th October 2018, 01:56 PM   #67
Pascal Nguyen is offline Pascal Nguyen  Australia
diyAudio Member
 
Join Date: Sep 2016
Location: Sydney
Default Power Supply Day

Using CRC filtering with el cheapo caps, just to find out how long would they last to the ripple current.
Will see.

Won’t gaming with the ouput capacitors.




Cheers
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