Braun CSV-1000 restoration

[paul_ral]

Hi gents!
My name is Paul, I am living in Romania (yellow wall) and repair and restorations of vintage audio gear are my hobbies. A few months ago I bought a defective Braun CE-1000 tuner, the transformer was missing but I manage to make one graceful Petra Toroid from Iasi. I changed all electrolytics capacitors, few lamps and the tuner works great!




Is working again!


A few days ago I found its amplifier Braun CSV-1000 which is also defective. No transformer inside, no power resistors in power source and mor important, no relays board which it is used to switch the inputs. The wires between input sources and the relays board are cut but I can manage to restore them.
These old pieces looks great









Main amp board


Power source


Head amp and control amp


Power supply and main amp cage




Now I am looking for that relays board (relais leiterplatte) maybe you can direct me to source one. These days I continue to change all capacitors, I will use axials and some radial ones from Mouser. Thank you for watching and i will be glad to answer at yours questions.
Paul

[paul_ral]

Main amp board revised: Nichicon TVX and Vishay axial capacitors


Power supply: Vishay axials, new zeners, 2N3440 instead BFY41 (I have BF258 inside) and all new resistors.



Next board will be the preamplifier. A lot of capacitors here, axial and radial, I already replaced radialos with Nichicon KL (low leakage) and I am thinking about axials, because they are standard capacitors and I want audio grade ones or low leakage for this application but theese are radial.

Because it is hard to find the relays board I have to make a replica board. I need your help, if somebody have pictures with this board. I search on net and I found a few with board in position and I notice that relays are made by Haller and these are 3532 type. Haller is Hengstler now, I am waiting their reply to my questions.

Best regards!

[paul_ral]

The transformer has arrived and I check the clearance. It fits perfectly





I have space enough for power resistors and rectifier bridge

[Schottl]

Nice work, thank you.

[bodi_061]

Great Job, Paul! 

[paul_ral]

Thank you Joachim!
A few steps forward, checking power source parts position.
C802 (800uF) and C805 (2500uF) are screw ones, they are expensive on Mouser and I found a cheap approach using snap-in capacitors with clamp. I bought Nippon-Chemicon for C802 (820uF) and 3300uF for C805 I have on hand.

[paul_ral]

Another board is ready, a lot of work to do it. I use Nichicol Fine Gold, Nichicon KL (low leakage) an axials from Vishay.

[bodi_061]

I´m exited to see what happens next, Paul!

[paul_ral]

So, next step!
I found a half of CSV-1000/1 in Germany, a friend of mine will send it to me. So I have the original transformer, power resistors network, rectifier diodes, power supply boards and main amp with output transistors on heatsinks. I want to keep it original.

[paul_ral]

A half of CSV-1000/1 is coming from Germany.

[paul_ral]

Back to my CSV-1000. As I understood the voltage for primary coil cames through blue cable with 3 wires: black, white and red. Red will be the ground, connected through 4700pF capacitor to negative pole of C802.


The trimmer goes to my CSV


I remove the main transformer. The wires has been cut, there are 2 black and 4 brown according their insulatings. I have to identify their position and connect them to input voltage switch



The puzzle needs to be solved!

[paul_ral]

Power supply is ready, I tested the voltages which seem to be right ones

[paul_ral]

In CSV-1000 one pair of 2N3055 was replaced, as drivers in that channel too. So I will use output transistors from CSV-1000/1, all ar RCA and I fhave good measurements on them. It is nice to have spare parts. The old coupling capacitors will be replaced by 4700uF/63 from F&T.

[paul_ral]

New capacitors inside. After that I can close the main amp section. Tested on dim bulb tester it looks to be ok, no smoke, I have to test it with signal generator

[paul_ral]

I am looking for relaysboard, maybe I will able to find one in Germany.

[paul_ral]

A little break in order to resurect two ASC: AS-2000 & AS-3001 are working again now!