BRAUN KOBOLD-G 1933 SCH
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AUDIO
SERVICE MANUAL
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BRAUN KOBOLDG 1933 KOBOLD KOBOLD-G
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Hello everyone, I'm having issues fixing this vintage stereo system, its amplifier boards seems to not be amplifying. The audio comes out at super low volume with the max. volume setting (the pot. works correctly). At first I had 20V and a constant hum coming out at the speakers output (saturated amp. I supossed). I changed the electrolytic caps., the 5218P component (TL082 replacement) and the NPN/PNP C1815 and A1015 transistors (this last thing helped with the amp. saturation and I do not have any DC at speakers now), but now the audio comes out super low. I measured the D1265 transistors off-board and they seem to be ok. Can anyone shed some light? Thanks in advance
Sziasztok!
Lenne nekem két jó kis trafóm, minőségi régi (Onkyo) házimoziból mentve.
Az egyik 2x34v AC (550W)
A másik 2x40v AC (400W)
Nincs valakinek egy jól bevált, (minőségi) végfok rajza?
Ehhez passzolós?
Mármint stereo felállásban.
A lényeg, minél kevesebb alkatrészből legyen!
Van egy a VF2.
De nem tudom.......
i have a very nice vintage DBX BX3 amp on which at least one channel fused.
power transistors literally burned down.
it is a very nice piece of hardware (4 channels with BTL capability 4x125W or 2x300W)
I would like to fix it myself. Having an electronic engineering degree, i think I should be able to undertake that venture but I never practiced (i've been in software for the last 40 years...)
So I need some guidance on the methodology to diagnose and track what went wrong.
I do have a scope, signal generator and I guess all required tools, as well as the schematics of the amp.
what I need is some help on locating the key parameters to measure and how to incrementally explore the different stages of the amp to find the faulty sections.
I guess I need to isolate the different sections of the amp but then, what ?
any help and advice will be highly appretiated.
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