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Old 2nd August 2013, 10:29 AM   #1
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Default BALANCED AUDIO VK 5 VK20

I had to repair a total of about 10 units from that company . 8 of them i did on my own 2 of them had weird troubles so i asked the help of the company in schematics and fault finding .

You will not believe how nice and friendly people picked up the phone on the other side willing to help from any aspect even willing to talk about the problem over the phone and often in cases where the model was quite old to remember by hart .

Nice people , very helpful and if i am allowed to say the Balanced Audio is the definition of what we say a service minded company .

Thank you all and my special thanks to Mr Victor Khomenko who looked in my case personally.

Kind regards
sakis
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SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
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Old 2nd August 2013, 11:28 AM   #2
kmtang is offline kmtang  Canada
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Hello Sakis,

I am just curious what common problem and what weird trouble you had you found with the BAT units. It looks to me BAT amps are well built and shouldn't have any problem at all.

Johnny
Repair Tech in Vancouver BC Canada
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Old 2nd August 2013, 11:39 AM   #3
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In the things i fixed on my own you have to include capacitors , tubes that failed after thousand of hours of use , transformers blown but obviously been operating in higher voltage than specified , blown rectifier , faulty encoder etch etch ....

Some units that have been "upgraded" or "repaired " by certified loonies applying on the unit 1000 snake oil capacitors with catastrophic results while my job was to restore the unit to an original condition .

In the latest unit i had excessive offset in the output static noise like 50hz or similar that wasn't related to power supply and some misbehavior in the gain circuit .

Kind regards
Sakis
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SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
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Old 2nd August 2013, 11:58 AM   #4
AJT is offline AJT  Philippines
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yes, in an old sansui tube amp i serviced the output coupling caps were replaced with 4.7ufd films when originally a 0.1ufd cap was used....
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Old 31st August 2013, 02:42 AM   #5
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A B.A.T. VK-5 schematic. Audio path only.
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File Type: pdf BAT_VK-5.pdf (30.4 KB, 87 views)
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Old 31st August 2013, 06:57 AM   #6
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Quote:
Originally Posted by J.Schmaedecke View Post
A B.A.T. VK-5 schematic. Audio path only.

Hey, that was really nice, thanks!

Any idea of B+, B-? 200v?
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Old 1st September 2013, 04:14 AM   #7
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The power transformer is 120V but here in Brazil we use 127V and on both the positive and the negative measure 159V. I think in AC 120V the power supply measure -150V to +150V.
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