Hi gang,
I am working on an old Creek 6060 integrated that I got that was not in great condition. Dirty etc.. just from age mostly. It was in working condition when I got it.
I did a full recap and it needed protection relays along with a bunch of bad solder joints. The amp seems to work fine and I've put a bunch of hours on it with no issues. I am revisiting the biasing of this amp because it's the only thing I didn't really dig into, assuming it was most likely fine. What I am finding is that the bias is very low, I can adjust it up but I am a bit concerned I may need to look elsewhere in the amp before I just go cranking up the bias values.
The inside of the amp says bias to 20ma, I have .22 ohm emitters so the math says I should have about .044 across those resistors. I had more like .004 which seemed a bit strange given I hadn't touched the pots. It also runs pretty much ice cold no matter how long its been on.
Should I be looking elsewhere before turning up the juice on this thing? I guess that's the real question I have.
Thank you!
I am working on an old Creek 6060 integrated that I got that was not in great condition. Dirty etc.. just from age mostly. It was in working condition when I got it.
I did a full recap and it needed protection relays along with a bunch of bad solder joints. The amp seems to work fine and I've put a bunch of hours on it with no issues. I am revisiting the biasing of this amp because it's the only thing I didn't really dig into, assuming it was most likely fine. What I am finding is that the bias is very low, I can adjust it up but I am a bit concerned I may need to look elsewhere in the amp before I just go cranking up the bias values.
The inside of the amp says bias to 20ma, I have .22 ohm emitters so the math says I should have about .044 across those resistors. I had more like .004 which seemed a bit strange given I hadn't touched the pots. It also runs pretty much ice cold no matter how long its been on.
Should I be looking elsewhere before turning up the juice on this thing? I guess that's the real question I have.
Thank you!
I have a Creek 4040, the bias on that is supposed to be 6mV on the emitter resistors.
AIUI, many Creek amps are very low bias, notable for cool running despite having small heat sinks.
20mA x R22 = 4.4mV
AIUI, many Creek amps are very low bias, notable for cool running despite having small heat sinks.
20mA x R22 = 4.4mV
Thanks for weighing in. It's definitely got 20ma right on the board in silkscreen but knowing yours is at 6ma I will just be conservative with it.
I appreciate the confirmation.
I appreciate the confirmation.
We have confusion with decimal places and mA vs mV here!
The voltage you have is not badly wrong for 20mA. 0.22ohms x 2x10^-2 = 4.4mV
Here's a schematic for one version of the 4040:
https://www.stereonet.com/forums/topic/310738-bias-adjustment-for-creek-4040-s3-amplifier/
The note about setting bias is a little confusing, AIUI, the procedure is to set the volts on the trimmer as a starting point, then fine tune to get the correct drop on the emitter resistors.
No idea if the 6060 is the same!!
I'm hoping someone more experienced will chip in, I've been around electronics a lot but not so much with audio!!!
I quite like the sound of my 4040, it's actually an older single supply model, I have looked with a scope but I don't have kit to properly measure distortion.
The voltage you have is not badly wrong for 20mA. 0.22ohms x 2x10^-2 = 4.4mV
Here's a schematic for one version of the 4040:
https://www.stereonet.com/forums/topic/310738-bias-adjustment-for-creek-4040-s3-amplifier/
The note about setting bias is a little confusing, AIUI, the procedure is to set the volts on the trimmer as a starting point, then fine tune to get the correct drop on the emitter resistors.
No idea if the 6060 is the same!!
I'm hoping someone more experienced will chip in, I've been around electronics a lot but not so much with audio!!!
I quite like the sound of my 4040, it's actually an older single supply model, I have looked with a scope but I don't have kit to properly measure distortion.
hi ,I am repairing a creek6060 amplifier,plz send a 6060 Manual copy for me ,E-mail :1239538837@qq.com,thank you so much ,