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Repair and Restoration of K250-1 & 1-18-B [message #24136]

Mon, 09 November 2015 03:01

tofur
Messages: 6
Registered: November 2015
Location: Denver, CO

Junior Member

I just acquired a gold sparkled K250-1 amp and 1-18-B cabinet.

Problems
1. The vinyl is discolored and has darkened over the years. The unexposed areas seem much lighter. I do not think it was ever one of the silver versions however.
2. The vinyl has some minor nicks, cuts, and scrapes, mainly on the back cover of the cab.
3. The upper and lower grills are completely missing.
4. On pre-amps 1 and 2 sound like an overdrive pedal is engaged at volumes that would be the equivalent of a 3 or 4 on the volume knobs.
5. The SELECTONE knob on pre-amp 1 does not seem to have any discernible change in the tone that I can really hear.
6. The treble pull knob on pre-amp 1 does not seem to have any effect as well.
7. On pre-amp 1 there is a rattle that sounds like possible cone damage on the speaker but could also be from faulty electronics in the amp...unsure. It is prominent when I play an A on the E string or the open A string itself. It is difficult to tell if it is the horn or the electronics. Upon inspection, the cone looks surprisingly good for something that is 43 years old.
8. There seems to be a slight hum and hiss coming off the the amp. The kind of hiss/hum that you would hear on something that is turned WAY up. This hum and hiss gets ridiculous when the instrument is not connected.
9. The screws on both amp and head for all covers, handles and plates have some minor rust.

The Good
1. The amp is loud...INCREDIBLY LOUD and has some major thump and drive when connected to either pre-amp.
2. Pre-amp 2 sounds incredibly clean and all the knobs/controls seem to be working fairly well.
3. The cabinet appears to be fairly structurally sound and there is no rattle to it.
4. The transformer in the head has a small bit of rust on outer casing but the electronics in the head look amazingly well with no visible issues with the components.

When I got it this week, the amp and and cabinet were filthy and covered in many years of cigarette smoke residue. I have done what I could to clean it up. I have also repainted the black wood inside the cabinet and that looks fairly good now. It stills slightly smells like an ash tray but it smells much better now.

What I need now from the hive mind here is either information or to be directed to...

1. Build or replace the grills.
2. Repair the vinyl damage.
3. Troubleshoot and repair possible issues that seem to be plaguing pre-amp 1. I am quite handy with a soldering iron. I used to repair arcade games and pinball machines.
4. Find the correct screws for all parts.

Christopher "Tofur" Duvall

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[Message index]

		Repair and Restoration of K250-1 & 1-18-B By: tofur on Mon, 09 November 2015 03:01
		Re: Repair and Restoration of K250-1 & 1-18-B By: tofur on Mon, 09 November 2015 03:09
		Re: Repair and Restoration of K250-1 & 1-18-B By: Iowa Boy on Mon, 09 November 2015 11:09
		Re: Repair and Restoration of K250-1 & 1-18-B By: chicagobill on Mon, 09 November 2015 13:19
		Re: Repair and Restoration of K250-1 & 1-18-B By: Kustom_Bart on Mon, 09 November 2015 14:16
		Re: Repair and Restoration of K250-1 & 1-18-B By: tofur on Mon, 09 November 2015 15:58
		Re: Repair and Restoration of K250-1 & 1-18-B By: tofur on Mon, 09 November 2015 23:06
		Re: Repair and Restoration of K250-1 & 1-18-B By: chicagobill on Tue, 10 November 2015 13:24
		Re: Repair and Restoration of K250-1 & 1-18-B By: stevem on Tue, 10 November 2015 06:13
		Re: Repair and Restoration of K250-1 & 1-18-B By: tofur on Tue, 10 November 2015 13:35
		Re: Repair and Restoration of K250-1 & 1-18-B By: tofur on Tue, 10 November 2015 13:36

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