Gold mine of DI¥ audio tubes schematics from Japan

[kstlfido]

Yes, thanks you for these postings!

 

[Soundhappy]

Not 15E
Tamasan22 show rudimentary schematics from time to time on his blog.
For example :

 

[Soundhappy]

Have a nice Sunday

 

[huggygood]

In the 70's ,80's and 90's France have L'Audiophile DiY magazine:

index

index

Best regards

thank's thank's thank's !!!!
merci merci merci !!!

 

[Soundhappy]

New 27 march update available

 

[MagicBus]

OK... Now could somebody tell me how do we read this? I'm interested in the feedback scheme.MJ1803_(04)MJ ZOOMUP_iPurifier-AC.pdf - Google Drive

 

[kylej1050]

OK... Now could somebody tell me how do we read this? I'm interested in the feedback scheme.MJ1803_(04)MJ ZOOMUP_iPurifier-AC.pdf - Google Drive

It's not perfect by any means but you get the idea...

Google Translate

Upload the PDF on that page and tell it to detect the language on the left and english or whatever you prefer on the right. Click translate and you get a new page with the translation.

It's laid out like the document so if you keep that open while looking at the text it'll help you keep track of what you are reading. For example, in the intro it looks like he used a pre-made chassis and to fill the hole for the rectifier tube the 0C3 was added.

 

[MagicBus]

It seems to work! I need to spend some time to understand the meaning. Many thanks!

 

[Soundhappy]

Component reference help to find missing PMC-1626HW data for example :
PMC-1626HW [pmc-1626hw] - 11,030円 : Zen Cart [日本語版] : The Art of E-commerce

 

[MagicBus]

Thanks Soundhappy! Nice thread!

 

[multi]

Wonderfull point to point wiring; some very good ideas like adding a heat sink to the top of the 2C39. But 9 watts with 1200 volts.
The amp a 211 driving a 211 can't imagine what the micro-phonics must be like.

 

[Soundhappy]

28 march update

 

[Soundhappy]

The amp a 211 driving a 211 can't imagine what the micro-phonics must be like.

Possible to ask Mr Mayer who is experienced with such 211 amplifiers
VinylSavor: 211 drives 211 Monos with Mercury Vapour rectified Power Supplies

 

[multi-volti]

Good stuff, but I’m hoping less peculiar translation on my PC than ‘smart’ phone. But I can make sense of the titles which is a big help!

 

[ChrisABC]

here's some (some are not Japanese),

simpletube (Korea)
tossi (Japan)
Nagashima's Designs (Japan)
diyzone
Svetlana Technical Bulletins
Schematic Heaven (Guitar Amps)

 

[Antoinel]

Thanks Soundhappy! Nice thread!

I fully agree MagicBus with you and other DIYers. Thank you Soundhappy. The diverse and "outpouring" of schematics in this thread inspired me to assemble a Class aP 12AX7A headphone amp. It sound great.

Best
Anton

 

[Shinja]

OK... Now could somebody tell me how do we read this? I'm interested in the feedback scheme.MJ1803_(04)MJ ZOOMUP_iPurifier-AC.pdf - Google Drive

It looks weird at first look, but it is typical G3-K connection as a lot of pentodes have internal connection.

 

[MagicBus]

I assume you mean the input tube and yes I understand that. I also understand the partial feedback at the power tube - 220k from plate to g1. It seems there are some calculations for the cathode resistor of the input tube wrt the global feedback that I can't follow and not least the connection of the power tube g2 to the driver's cathode, to my understanding another form of feedback.

 

[Shinja]

OK, cathode resistor is 680+51Ω for matsushita 6EJ7 or 680Ω for toshiba 6EJ7 written on right side of the picture.The power tube G2 is driven by the driver, it is not a feedback.This both G1 G2 driving circuit is used by the writer Soya Susumu many times, though, I do not see its clear benefit.

 

[MagicBus]

Many thanks Shinja! A quick search about Soya Susumu returned the "direct dynamic coupling". An explanation of this found here:3C24SE amp... post #33. Difficult to find anything else.