nbndtrain
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Posts posted by nbndtrain
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QuoteOn 5/26/2023 at 9:30 AM, John Warren said:
On the rectifier replacement, the 12AX7 filament string should read ~ -72VDC without tubes and with all four plugged in drop to -55VDC.
Where are you measuring? At the rectifier, or the first 12ax7? I am getting -48v after the first dropping resistor, which was swapped with a 33ohm resistor as you did.
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Thanks to both of you. I am just a hobbyist, so appreciate all your input. I've replaced the selenium rectifier, bumped up the first dropping resistor to 33uf and replaced all the coupling caps. Also cleaned all the switches and sockets with D5, and lubed the pots. It's running fine now, but sounds like crap. I have caps to do the power supply cans, but have not done them yet as voltages are within spec, just a bit high with current home AC voltage.
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Good to know. I added a CL-80 on the AC in and mine is still 10-15 volts DC over, in most places. I am pretty sure my Telefunken output tubes are close to dead. One tube was red plating when I got it. After replacing all the coupling caps the amp still sounds pretty distorted. Ordered a quad of Russian 6p14p-ev from Ukraine. Not sure how long it's going to take to get here.
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The service is going along well! I found mine had a bad 8k ohm standee resistor. I was able to get a replacement brown devil inside, somewhat out of the way. Voltages are within spec now, although I think the output tubes took a pretty big hit. Mind posting your voltages?
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I'll follow along. I just picked up an identical one and am excited to restore it. I have always loved the all metal knobs. The last Scott I had I used the hhscott forum. Sad to see that it's gone.
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SOLD
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Still available. Due to furniture arrangement, the corner horns no longer make sense. I will be replacing them with a set of Boston Acoustics A400.
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Original as far as I know. Maybe these were early recipients of the newer badges?
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Thanks everyone. Just for awareness, I purchased these speakers from a forum member here in 2011, before the site migration. He was the second owner, and we both have only used McIntosh equipment to drive them. Hopefully I too can pass them on to someone else here.
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Consecutive serial number 1978 oiled walnut Klipsch Klischorns in mint condition. Used regularly at low volume. Located in Denver, CO
Price dropped to $SOLD
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Modern op amps, filter caps, output coupling caps are a good place to start. If it has issues reading burned CD's most likely a dried out 33uf cap on the servo board. You can delete muting transistors, and look into non-oversampling. After that, you can look into an aftermarket clock, new TDA1541 decoupling caps, the list goes on and on. I have a mildly modified one with non-OS and a stock one and I can't really hear too much of a difference. I think the Op Amps made most of the difference, being a crisper top end.
Scott 222C
in Talkin' Tubes
Posted · Edited by nbndtrain
Original output tubes on mine were definitely completely toasted. While I waited for a matched quad of 6p14p-ev tubes, I replaced all the multi-section power supply caps with individual electrolytics under the chassis. Even after that, the amp sounded like crap. The new output tubes made all the difference and it now sounds fantastic! I had to play around with the phase inverter tubes, but found a set that really sounds great. All original Telefunken phono and preamp tubes sound great! I have always missed the HH Scott LK-72B I sold, and will be enjoying the 222c for a long time.