Gold mine of DI¥ audio tubes schematics from Japan

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[analog_sa]

#441

An ultralinear without the special tap Seems like an obvious idea but never seen it before.

 

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Have a nice day

 

[nicoch58]

Nice !

 

[Soundhappy]

+ Vintage book's with schematics classified in public domain

https://ia902803.us.archive.org/33/...RobinLipman1947PracticalAmplifierDiagrams.pdf

https://ia800802.us.archive.org/13/...164-Mullard-Circuits-for-Audio-Amplifiers.pdf

 

[juanitox]

interesting to see how many times they use small signal pentode in pentode mode mixed with triode and not in pseudo triode like nowadays. perhaps tone was more appreciated than bandwidth

 

[hpeter]

nice

 

[audiowize]

interesting to see how many times they use small signal pentode in pentode mode mixed with triode and not in pseudo triode like nowadays. perhaps tone was more appreciated than bandwidth

You believe a small signal pentode run as a pentode has lower bandwidth than a high mu triode?

 

[Soundhappy]

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[dady]

Incredible Kristof,

 

[gideon1990]

would love to see that DA100/845 amp glow!

 

[Kay Pirinha]

May I ask what the 866A in this schematic does? Rectifying DC?

Best regards!

 

[dady]

It is a delay to prevent the peak DC from flowing from the capacitors loaded with the peak voltage of the doubler which is 2.82x400volt and overstress the circuit valves on the output tube.

 

[gideon1990]

May I ask what the 866A in this schematic does? Rectifying DC?

Best regards!

Delay of the B+

The 866 warms up slowly and by the time it starts conducting the other tubes had time to heat up a bit before getting the full B+