Gold mine of DI¥ audio tubes schematics from Japan

[Soundhappy]

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[JoeAlders]

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That 23V in the 8th picture..... for what purpose is that?
I certainly did miss something.
But anyway it is still a great thread, yessss!

 

[RE 604]

Look at Q3 in the picture before .
Kind regards , Alexander .

 

[JoeAlders]

Look at Q3 in the picture before .
Kind regards , Alexander .

Ah !

Thanks Alexander. Completely overlooked that.

 

[Soundhappy]

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[Soundhappy]

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[Soundhappy]

 

[Steve Morley]

Soundhappy, don't want to hijack your thread....

but I couldn't resist the Japanese fixation with the QUAD II. I had a Hammond 270FX and two 1608 transformers hanging around and built one of the EL84 QUAD "clones". JJ EL84s and Russian EF86 equivalents. Russian K40-Y coupling caps. I subbed a GZ34 instead of silicon for the B+ supply and I (over?) indulged the Japanese fetish for filter chokes using three small Hammonds. I also made the EL84 cathode bias adjustable a la diytube.com Dynaclone. Sound? Not bad. Only about 10 watts. Sounds fine in a workshop system driving a small pair of Wharfedale Diamonds.

Cheers, Steve

 

[JoeAlders]

For the first time, yes I have to confess that, I did have a closer look at the filament wiring and noticed that those wires (to pins 7 and 8, correct me if I am wrong) are not twisted. And, as far as I can interpreted, it is not DC.I am correct? But of course it is a drawing and not an actual wiring but anyway.....

 

[Soundhappy]

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[Soundhappy]

but I couldn't resist the Japanese fixation with the QUAD II. I had a Hammond 270FX and two 1608 transformers hanging around and built one of the EL84 QUAD "clones". JJ EL84s and Russian EF86 equivalents. Russian K40-Y coupling caps. I subbed a GZ34 instead of silicon for the B+ supply and I (over?) indulged the Japanese fetish for filter chokes using three small Hammonds. I also made the EL84 cathode bias adjustable a la diytube.com Dynaclone. Sound? Not bad. Only about 10 watts. Sounds fine in a workshop system driving a small pair of Wharfedale Diamonds.

Cheers, Steve

Super Cool Congratulations Steve!
Thanks for Your nice QUAD clone pictures Applause

 

[nicoch58]

but I couldn't resist the Japanese fixation with the QUAD II.
Cheers, Steve

No OPT CFB winding.... No Quad2 party

 

[Kay Pirinha]

'Xactly. The only thing that resembles the Quad II is the phase inverter.
Best regards!

 

[Steve Morley]

Yes, I get the no CFB part. The Japanese clones don't have 'em. Cheap 'n cheerful was the aim.

S.

 

[Kay Pirinha]

https://www.diyaudio.com/forums/attachments/tubes-valves/846632d1590241111-gold-mine-di-audio-tubes-schematics-japan-c6cb4b1d-7d81-4fd7-adad-3ac597dec875-jpg

https://www.diyaudio.com/forums/attachments/tubes-valves/849530d1591138269-gold-mine-di-audio-tubes-schematics-japan-5983ca5f-3a07-4578-8c37-4c8b088fa75f-jpg

Great! I love these amplifier designs that are symmetrical from the first stage on !
Best regards!

 

[Soundhappy]

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[Soundhappy]

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[Soundhappy]

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[Soundhappy]

遠い昔のラジオ少年 HOME Best regards