Propozycja zamówienia końcówki mocy klona accuphase E-450.

[jaskiniowiec]

2sc4685 and 3964 - on the market are sold exclusively fakes.
For temperature compensation 2SD1694
http://www.kashinoki.co.jp/page021_2m.shtml
100 proc original.
Counterfeiting of ebay also work.
your choice

[dzwiedziu]

They were checked 2sc4685 or 2sc3964 so I do not know how the system will behave with the BD139.

[platon.rado]

Q25 is BD139..it is good???

The amplifiers are not thermally stable.Bias arbitrarily increases.Of 100 mA to 120 mA for 10 minutes.VR1 it works.

[dzwiedziu]

And more specifically?

[platon.rado]

Hello boys,amplifier plays perfectly, but bias is dependent on volume.You do not know what it can cause ???

[platon.rado]

amplifier works..thanks guys.DC offset 3mV.Thanks Grzegorz

[platon.rado]

GND A, belongs to auxiliary power supply..oki thanks

[platon.rado]

I have new pcb version 2016.I have two gnd.GND A and GND B.GND B is the main.But what is GND A...Thanks guys.

[dzwiedziu]

GND is ok???

[.3lite]

If you connect it on the main capacitors (usually between them) then the return current of the signal path will be modulated by the charge current of the main capacitors resulting in 50 Hz tone and its harmonics. It's hard to tell whether it will be audible or not since it depends on the location and the flow of the current, but it will certainly degrade the overall performance of the amplifier.

The best option to solve this issue which in fact should have been solved on the PCB (the design is quite crappy since the PCB itself should act as the main ground point for the signal and the output) is to create a standalone ground point after the main capacitors to avoid modulations caused by the charge current.

Also, please use the following uploader for your images:

http://diyaudio.pl/uploader.php

Click on the "diyaudio.pl" rectangle (a default container if you will) and use option of "Dodaj pliki" to select desired files in order to upload them ("Załaduj obrazki"). Below all of that you will find your images which you can use on the forum.

[platon.rado]

GND is ok???

[platon.rado]

tomorrow test

[platon.rado]

Thanks

[dzwiedziu]

D18,19,20,20 not standard.
R29~32, R59,60 fuse resistor or metal film 0,6W.

[kolmen]

It would be better use fuse resistor , but You can mount standard resistors a same value
D20,D21 are HZ153L

[platon.rado]

Hello guys.

R29-32 R59,60 must be fuse resistors ???

And value D20,21 ????

Thnaks

[Darodff]

Hej

Odkupię trafo plus zasilacz do E-450 Ewentualnie komplet drobnicy do niego

Pozdrawiam

[Birofil]

Cewka 1uH w zabezpieczeniu jest wystarczająca czy lepiej nawinąć większą?

[jaman7]

Dzisiaj była przygoda z e450, znaczy odpalam rano tak aby coś grało, mija kilka minut wyłącza się, zabezpieczenia zadziałały, no drugi i trzeci, mierze czy nie ma dc na wyj , i okazało się ze na jednej powoli narastało DC do zadziałania zabezpieczenia. A całym złoczyńcą był kurz który nazbierał się przez otwory od góry obudowy.

[Trol.]

Niestety nie pomogę. Nie wiem. :unsure: