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K250-1 [message #17015]

Sat, 28 April 2012 22:11

RobbieNuke
Messages: 66
Registered: October 2006
Location: Baltimore

Member

Just scored a K250-1 (black, 1972) on eBay. Very good+ aesthetics. During initial try-outs the front control panel rattled at high volumes (a layer of Scotch VHB tape around the contact edges fixed that). All controls functioned Ok, but some cold solder joints on J3 and a broken J2 assembly crimp (how rare!) created a 'popping' sound when 'jiggling' the phone plug during insertion/removal (BTW, it liked Switchcraft better than G&H brand plugs).

Anyway, I need help trying to source the following parts for replacement:

1. What is the correct IC (integrated circuit chip) for the Channel 1/Selectone PCB (PC5067)? The IC installed is dated 1974 but has no ID on it. It also isn't sitting level and the solder points do not look like the rest of the PCB indicating this was repaired at some point in time. This preamp has a very faint & rapid 'popping'... (sounds a bit like Morse code) that I attribute to the IC... even without any instruments/cables plugged in. Loudness increases/decreases with volume control. No such noise in Channel 2.

2. I would like to get an exact replacement Bass control pot for the Channel 2 (a CentraLab unit seems to have been installed at some point in time. It is a bit deformed trying to fit and the bushing is too short). Anybody know the exact CTS p/n for the 50k Ohm unit I would need? It doesn't have to be code dated 1972.

3. The original Power/Polarity switches are present and functional...except for the lamps inside. Are they easily serviced? If so, what is the part number for the lamp?

If anyone can provide me with exact and/or suitable equivalent substitute parts I would surely appreciate it. Thanx!

[Updated on: Sat, 28 April 2012 22:31]

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[Message index]

		K250-1 By: RobbieNuke on Sat, 28 April 2012 22:11
		Re: K250-1 By: stevem on Sun, 29 April 2012 07:38
		Re: K250-1 By: RobbieNuke on Sun, 29 April 2012 17:55
		Re: K250-1 By: stevem on Mon, 30 April 2012 06:54
		Re: K250-1 By: RobbieNuke on Mon, 30 April 2012 07:39
		Re: K250-1 (update) By: RobbieNuke on Sun, 03 June 2012 00:33
		Re: K250-1 (update) By: stevem on Sun, 03 June 2012 08:11

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