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  4. » Chinese tube amp wiring

 
Chinese tube amp wiring...

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Chinese tube amp wiring sent on March 03, 2020 (0:12) by Jacopo Pasqualotto. 16 comments, 690 views. [retina]

1/50 f/1.9, ISO 50,

Cablaggio in aria di un amplificatore valvolare cinese da 150 euro in kit di montaggio. Ho seguito fedelmente le istruzioni, modificando leggermente l'assemblaggio della sezione di filtro per evitare guai in futuro. Tempo impiegato: circa 10 ore.



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avatarsenior
sent on March 03, 2020 (1:12) | This comment has been translated

Great!

avatarsenior
sent on March 03, 2020 (10:49) | This comment has been automatically translated (show/hide original)

beautiful, and despite everything in the air the wiring is ordered :-D, how does it sound?

avatarsenior
sent on March 03, 2020 (12:56) | This comment has been automatically translated (show/hide original)


avatarsenior
sent on March 03, 2020 (14:50) | This comment has been automatically translated (show/hide original)

also pleasing to the :-D view

avatarsenior
sent on March 03, 2020 (15:32) | This comment has been automatically translated (show/hide original)

It's BELLISSIMI !!!!! :-D :-D :-D :-D

avatarsenior
sent on March 03, 2020 (16:07) | This comment has been automatically translated (show/hide original)

Did you see the wiring?
https://www.juzaphoto.com/gallery.php?l-en&t-3501797

avatarsenior
sent on March 03, 2020 (17:39) | This comment has been automatically translated (show/hide original)

Orderly! Congratulations! Is the armored resistance that of bias?

avatarsenior
sent on March 03, 2020 (17:43) | This comment has been automatically translated (show/hide original)

@Jacopo - No, it serves for the soft-start, with the first shot you turn everything on with a reduced voltage, precisely from the resistance....
Look at this:
https://www.juzaphoto.com/galleria.php?t-3501893&l-en&l-en&l-show-last-19793627

avatarsenior
sent on March 03, 2020 (18:31) | This comment has been automatically translated (show/hide original)

Another show! What a beautiful component. What brand are the capacitors in the center? Together with the others it will have been an expense....

avatarsenior
sent on March 03, 2020 (18:40) | This comment has been automatically translated (show/hide original)

@Jacopo - They are original Philips. I bought a box at a fair..... price from banquet, but excellent indeed excellent.

avatarsenior
sent on March 03, 2020 (20:17) | This comment has been automatically translated (show/hide original)

Here's the other amp made in china. This one's already mounted. The circuit is the realization with the fewest components I have ever seen. The straighteking is raped by the filter capacitor, but for now it works well... :-D
Inside was full of welding scraps that I carefully cleared by brush, but the pond is beautiful polished and the layout neat.
[IMG2]3502262[/IMG2]
EL34s had labels in the hoof with pen digits, .... at least they had a minimum of selection.

avatarsenior
sent on March 03, 2020 (20:20) | This comment has been automatically translated (show/hide original)

And here it is externally. Below is a Perser radio (Italian company of Vicenza) 60s transistors all at the germanio. Driver tube 6SL7, straightening 5Z3 or similar. Ceramic hooves.
[IMG2]3502266[/IMG2]
150 Euro shipped.

avatarsenior
sent on March 03, 2020 (20:51) | This comment has been automatically translated (show/hide original)

The circuit board seems to be universal, because I see screenprints with missing components.
I'm puzzled by the power supply... the capacitors are really tiny.
Did you check the tensions?

avatarsenior
sent on March 03, 2020 (21:12) | This comment has been automatically translated (show/hide original)

As much as I've been looking for, the pattern doesn't exist, so I don't know what tensions to see. The capacitor is more than double that provided for the straighter in datasheets. That's why I said he raped me. But, despite this, everything works without overheating or cooked components. There is no flash of the filaments on ignition, but they heat up gradually, the transformers work lukewarm, at least they are sized properly.
The empty seats, from what I deduced, were for a right-left balance, headphone output and 2 vu-meter, present in other similar products.

avatarsenior
sent on March 03, 2020 (21:23) | This comment has been automatically translated (show/hide original)

@Jacopo - looks like mine with the KT88, with the following differences:
- removed the catodo capacitors, so you have a local feedback
- The 6SL7 being a double triodo, does the functions of the two triodi 6C5
- lacks the total feedback network
- the power is valve and has no filter inductees, in mine there are as many as 2 to further die and filter the screen grid of the finals and the triodo
. If you want, you can implement.

avatarsenior
sent on March 04, 2020 (10:48) | This comment has been automatically translated (show/hide original)

Um... You put the flea in my ear and I checked: the inductance of the power supply is above, next to the exit transformers. It's the two big blue and red wires that go to the right.
When the warranty expires, maybe I'm working on...


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