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 91 
 on: April 26, 2017, 02:05:24 pm 
Started by fffaustino - Last post by fffaustino
Thanks for the info and your fast reply!

and best regards from Spain!

Alfredo

 92 
 on: April 26, 2017, 12:41:00 pm 
Started by MikeCheck - Last post by klaus
First,  I would like positive confirmation that this capacitor actually failed. In 30 years of dealing with them, both in M49 and U47/48 I have never had a single one fail.

But, if indeed the cap is shorted (?) your choice will audibly affect the sound of the mic: some swear by wet tantalums, others by oil-soaked contraptions. A very good film and foil (not metalized poly-prop!) will add a bit more clarity without thinning out the sound, while those film & foils made with other metal films typically sound more pointy in the mids and highs.

Contact me privately if you want to replace with original material-these days collectors collect everything...

 93 
 on: April 26, 2017, 12:31:31 pm 
Started by fffaustino - Last post by klaus
That is either  1974 or 1984- the appearance did not change much during that decade. Judging from the size of the hand writing, I guess 1974.
Best, KH

P.S.: I have assembled a good 100 different K67/87 capsule pictures on my desktop computer, which I will label and upload to my website, so these inquiries may become a bit easier in the future to answer.

 94 
 on: April 26, 2017, 11:11:05 am 
Started by fffaustino - Last post by fffaustino
Hi again Klaus!

after many months passed i have finally gotten a used capsule to my u67...

Itīs a plastic diaphragm rings one and very similar to the others i have, but i would need your help to date it because despite being an ivory color one (1966-1980 acordlying to your guide) it is marked with a black paint single digit ("4") which i thought it was a characteristic for more modern capsules.

Thanks for your time and sorry for my english..

best,

Alfredo

 95 
 on: April 26, 2017, 01:58:56 am 
Started by MikeCheck - Last post by MikeCheck
Hello!
So I have an M49 with a failed decoupling cap (C5). Anyone have any experience with replacing this cap and picking a suitable substitute?

Thanks!

 96 
 on: April 25, 2017, 07:22:45 pm 
Started by Mikeyod - Last post by radardoug
Studer faults can be a bitch! Keep at it! If you can do the measurement it might help. I'm going to throw the board up on the bench at some stage and see what I can find.

 97 
 on: April 25, 2017, 07:18:45 pm 
Started by Mikeyod - Last post by Mikeyod
I will check it. Thought I had something when I pulled that 10 ohm resistor, it had a nice black spot on it from R46 270 ohm right up against it. Changed them both out still slowed down. Oh well,
this thing is busting my chops !

 98 
 on: April 25, 2017, 04:33:35 pm 
Started by Mikeyod - Last post by radardoug
Something like a TIP120. Very grunty. Your 1600 Hz looks fine. One thing if you could measure. The voltage at the collector of the RCA 411 should drop to 3 volts when it is trying to correct. Can you measure this voltage when the machine is slowing down? If this voltage is not down to 3 volts, it means the drive side is not working right.

 99 
 on: April 25, 2017, 01:57:20 pm 
Started by Mikeyod - Last post by Mikeyod
ZTX605 ? The gain is 2000 @ 1 amp. The BC140 15-30 @1 amp.
This gets a bit beyond my scope. This machine has run well since 2009 so 8 years without a slowdown. It has had other minor issues with the record/reproduce boxes that I have been able to fix. But speed wise it has been rock solid. Tell me if I understand the circuit correctly.

The capstan motor spins creating pulses in the tacho head which are fed into card .372.
There is a timer section that creates a reference frequency of 1600hz these two numbers are compared some how and a speed adjustment is made so they match. I wonder if the problem could be in this area rather than the drive section. My square wave looks like this at 1600hz.

 100 
 on: April 25, 2017, 07:57:38 am 
Started by Mikeyod - Last post by Mikeyod
Could you recommend an available part number ?

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