Two months ago I delved into the vintage audio world, and I'm forever sold. I picked up an 881 from an electronics bin at the dump.
Cleaned it up, plugged it in, and it works . . . but there was a very loud and annoying buzz. I took some AK forum advice and after re-heating some ground solder connections it was gone. A month later one of the channels is muted and distorted. Some more AK advice and some contact leaner later, and it's fixed as well.
Well Now I'm wanting to give those 38 year old Capacitors a proper burial, and get some new ones, but I have a few questions.
1. There are orange 1μF 50V capacitors, and 3.3μF 50V Capacitors. They have a row of "(M)"s and they say "LR" on them as well. I'm confused because there are other gray/blue capacitors of the same values on the boards. Why the handful of orange caps in a sea of blue and gray? Are they a special brand? Do they do something the regular gray/blue ones don't?
2. The panel that all the buttons and dials are attached to below the glass display. . . how do you get that off? I've removed the two screws and the nuts/washers on the dials, but I can't get the push-buttons off? Do they pull off? Twist off? Or are they glued on? I don't want to break one and have to drop $15 on eBay or some other place to get a replacement. This is the last CCT board I need access to. Once I have that out I will be finished cataloging all the capacitors on the board.
When I'm finished recording all the info, if anyone would be interested, I'll post the capacitor list which would include the electrical values and the size so anyone else interested in recapping the 881 won't have to do all the counting and sorting, and all that other fun stuff. Maybe even the Digikey #'s for all the parts as well so people know they are getting the right ones when they order.
Thanks.
The beast in Question:
***EDIT***
Here is the Digikey list with the Capacitor descriptions, part numbers, and number of units to re-cap your 881 in order of decreasing voltage and uF.
Enjoy! (click for big)
Cleaned it up, plugged it in, and it works . . . but there was a very loud and annoying buzz. I took some AK forum advice and after re-heating some ground solder connections it was gone. A month later one of the channels is muted and distorted. Some more AK advice and some contact leaner later, and it's fixed as well.
Well Now I'm wanting to give those 38 year old Capacitors a proper burial, and get some new ones, but I have a few questions.
1. There are orange 1μF 50V capacitors, and 3.3μF 50V Capacitors. They have a row of "(M)"s and they say "LR" on them as well. I'm confused because there are other gray/blue capacitors of the same values on the boards. Why the handful of orange caps in a sea of blue and gray? Are they a special brand? Do they do something the regular gray/blue ones don't?
2. The panel that all the buttons and dials are attached to below the glass display. . . how do you get that off? I've removed the two screws and the nuts/washers on the dials, but I can't get the push-buttons off? Do they pull off? Twist off? Or are they glued on? I don't want to break one and have to drop $15 on eBay or some other place to get a replacement. This is the last CCT board I need access to. Once I have that out I will be finished cataloging all the capacitors on the board.
When I'm finished recording all the info, if anyone would be interested, I'll post the capacitor list which would include the electrical values and the size so anyone else interested in recapping the 881 won't have to do all the counting and sorting, and all that other fun stuff. Maybe even the Digikey #'s for all the parts as well so people know they are getting the right ones when they order.
Thanks.
The beast in Question:
***EDIT***
Here is the Digikey list with the Capacitor descriptions, part numbers, and number of units to re-cap your 881 in order of decreasing voltage and uF.
Enjoy! (click for big)
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