The amp works perfectly, but occasionally the left channel does not turn on and I read that both the relay and the electrolytic of the soft-start circuit are prone to fail.
Being an amplifier of almost 25 years, I think that in addition to repairing the soft-start board could change all the electrolytics and probably other components that do not look good.
But despite having searched a lot, I have been unable to find the schemes.
If someone has them, can give a clue as to where to find them, or can share any experience on this particular model, I would be very grateful.
Thanks,
Rod
Being an amplifier of almost 25 years, I think that in addition to repairing the soft-start board could change all the electrolytics and probably other components that do not look good.
But despite having searched a lot, I have been unable to find the schemes.
If someone has them, can give a clue as to where to find them, or can share any experience on this particular model, I would be very grateful.
Thanks,
Rod
Yes, I did, but since it focuses on the original KSA50 and the MKII, I really did not take the time to read the whole thread. 🙂
I have the model S, a different beast.
Is there any KSA50S scheme hidden in that thread?
Thanks.
Krell ksa 50s
Hi,
Dix you manage to find this schematic ?
I’m in trouble with this amp.
Thanks a lot
Hi,
Dix you manage to find this schematic ?
I’m in trouble with this amp.
Thanks a lot
Hello
chongliu,
Do you still have the schematic of the KSA50s? And if so are you willing to share it with me?
Thanxs.
Nice!.
What is the value for the powersupply of the driver?
But not correct ;-) The feedback loop and DC correction are connected switched.
Last edited:
Hi,
Picking up this thread. I'm also looking for a KSA-50S schematic. Does anyone have one they could share?
I'm helping a friend deal with their recently-deceased amp; it powers up for a second and then shuts down. A quick check of what I could get to without major dismantling shows that 2 of the 3 output emitter resistors visible at the top of the left channel board are open circuit and burned. The companion TO-3 transistors appear to have shorted, which explains the resistor failure. I suspect there will be a similar problem with the other half of the circuit, but I won't know until I get it apart and can access the bottom of the board.
Before I take the surgery any further it would be great to have a schematic as a guide.
Thanks,
Peter
Picking up this thread. I'm also looking for a KSA-50S schematic. Does anyone have one they could share?
I'm helping a friend deal with their recently-deceased amp; it powers up for a second and then shuts down. A quick check of what I could get to without major dismantling shows that 2 of the 3 output emitter resistors visible at the top of the left channel board are open circuit and burned. The companion TO-3 transistors appear to have shorted, which explains the resistor failure. I suspect there will be a similar problem with the other half of the circuit, but I won't know until I get it apart and can access the bottom of the board.
Before I take the surgery any further it would be great to have a schematic as a guide.
Thanks,
Peter
Attachments
Hi, I need a circuit for Krell KSA-50S, service manual, or, if anyone remembers, the value of the emitter resistors on the output transistor driver, between the base and the emitter of the output trans ?! It has 3 pairs of output transistors, I note that it is a 50S model!
