Kaisaya HiFi Audio - Schematics wanted for Accuphase clone and Music Fax' Power Amp

[tiefbassuebertr]

Accuphase model "E405"-clone and Music Fax Power Amp "F18" and "A-1000" from Kaisaya HiFi Audio - Schematic wanted

For the follow products I am looking for schematic diagrams:

2pcs E405 Gold Seal Tube Post Grade Amplifier Board Class A High Power HIFI AMP Circuit Module 200W MJ15024G/MJ15025G/2SA19-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group

E405 power amplifier board (reference circuit Accuphase) (1 pair) in E405 power amplifier board (reference circuit Accuphase) (1 pair) aus Schalterkappen auf AliExpress.com | Alibaba Group

MJ21195 MJ21196 MJE15032 MJE15033 BC546B BC556B WIMA MKP10 2.0 250W Music Fax F18 Class A Postposition Power Amplifier Board in MJ21195 MJ21196 MJE15032 MJE15033 BC546B BC556B WIMA MKP10 2.0 250W Music Fax F18 Class A Postposition Power Amplifier Board aus Verstarker auf AliExpress.com | Alibaba Group

MJ21195 MJ21196 MJE15032 MJE15033 BC546B BC556B WIMA MKP10 Musik Fax A1000 2,0 60 watt Klasse A Endstufe in MJ21195 MJ21196 MJE15032 MJE15033 BC546B BC556B WIMA MKP10 Musik Fax A1000 2,0 60 watt Klasse A Endstufe aus Verstarker auf AliExpress.com | Alibaba Group
MJ21195 MJ21196 MJE15032 MJE15033 BC546B BC556B WIMA MKP10 Music Fax A1000 2.0 60W Class A Power Amplifier in MJ21195 MJ21196 MJE15032 MJE15033 BC546B BC556B WIMA MKP10 Music Fax A1000 2.0 60W Class A Power Amplifier aus Verstarker auf AliExpress.com | Alibaba Group

Thank you very much for upload.

The brand "Music Fax" I have never heard before, but the board of power amp so as the completly device looks both very impressive and well made.

 

[analog_sa]

Accuphase themselves are a fine source of reliable info. The china interpretations, for some reason, are seldom accurate or have much merit.

http://www.accuphase.com/cat/e-405en.pdf

 

[tiefbassuebertr]

Accuphase themselves are a fine source of reliable info. The china interpretations, for some reason, are seldom accurate or have much merit.

http://www.accuphase.com/cat/e-405en.pdf

thank you for posting the schematic. At first glance I miss the cascode configuration in the VAS stage.
The actually question is, what impression occurs while a listening test against the genuine E405 amp device.

 

[tiefbassuebertr]

A friend had realized last two weeks an amp project where this modules are in use - go to the attached images.
Sound character is in the low and mid level area quite close to those from his previously used Pass power amp X250 - go to
https://www.diyaudio.com/community/threads/pass-x250-repair.327244/

 

[tiefbassuebertr]

Under
https://en.aliradar.com/item/324257...rd-protect-the-two-channels-speaker-amplifier
are to find PCB boards and is to find the same schematic - unfortunately no better resolution as the attached file in post #2

R6+R8 (actually for Iref of cascode transistors) are connected with the sources of the input jFET's.
This seems to be a misprint.
The question is, what is the aim of VR12 between the sources of the upper and lower jFET pair ?

 

[tiefbassuebertr]

Who know the currently website from Kaisaya HiFi Audio ?
the old website of E505 power amp unit isn't longer online - here the google cache
https://webcache.googleusercontent....005002934655996.html&hl=de&gl=de&client=opera
Thanks for an advive.
In the attachment are a realized project with this power amp unit.
Power transformer is those under
https://sklep.toroidy.pl/en_US/p/TT...ade-transformer-TSAS1500VA-voltage-to-50V/427

 

[tiefbassuebertr]

The circuit diagram shown in post #2 and only available on the web refers to the version with the Toshiba output power devices 2SA1943 and 2SC5200.
While I unsuccessfully searching on the web for the circuit from the Accuphase E505 clone (which I have now create by using of a faulty power amp unit), I discovered that there are two other versions of the E405 clone: one with MJL4281+MJL4302 in the output stage and another with the MJ15024G+MJ15025G (traditional TO-3 outline). The differences to the schematic from post #2 I will find out and evaluate in the next time.
BTW the E505 clone is only available with the MJ15024G+MJ15025G - i. e. only one version.
In the attachment images of the E505 with MJ15024G+MJ15025G and E405 with MJL4281+MJL4302 and MJ15024G+MJ15025G.

 

[tiefbassuebertr]

E405-clone: Versions with 2SA1943/2SC5200 (ft 30 MHz) in the attachment.
Ft from MJ15024G+MJ15025G is only 4 MHz - thus actually must be various differences in the associated circuit diagrams - so I think.