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Forum: Comment Board
 Topic: Serial Number Chart
Re: Serial Number Chart [message #27965 is a reply to message #11377] Fri, 22 January 2021 04:12
Jo Nathan is currently offline  Jo Nathan
Messages: 1
Registered: January 2021
Junior Member
Hello everyone. Super excited to find this great website. My Dad played Kustom gear in the late 60s and early 70s. He passed away last January so I started collecting some Kustom gear to honor him. I would love to know the year each of my pieces were made. Thank you for your time.

1) SN: 4742
2) I didn't see a model number. It's a 4x12 vertical (PA?) tower.
3) Production code... NA?
4) Black naugahyde

1) SN: 3615
2) I didn't see a model number. It's a 4x12 vertical (PA?) tower.
3) Production code... NA?
4) Black naugahyde

1) SN: 66554
2) 2-15 B
3) Production code... NA?
4) Black naugahyde

One of the speakers inside the 2x15 says 137 7349 as well as 038-0024-00. I'm assuming CTS? I'd love to luck out and get Altecs, but I doubt it. Smile

1) SN: 74964
2) K250-1
3) Production code... I don't know how to open up the amp. Although I am getting my friend who works on vintage amps to install a grounded cable and make sure everything is working properly. I noticed the first input on the lower channel is a good bit lower in volume than the other 3.
4) Black naugahyde

I'm thinking the 2x15 is from early 1971 and the head is from late 1971 (total coincidence btw. I bought one in Louisiana and one in Minnesota), but please confirm. Thank you again for your time and knowledge.


Re: Serial Number Chart [message #27966 is a reply to message #11377] Fri, 22 January 2021 11:33
stevem is currently offline  stevem
Messages: 4330
Registered: June 2004
Location: NY
Senior Member
Hello!
You have replied to this string which answers most of the questions you ask about but for your questions in regards to the K250 head.

The the introduction of the metal face heads in 71 they reverted back to having two inputs on each channel of differing gain levels as opposed to tone on the earlier amps.

Also in 1972 with these amps Kustom added more gain to PC 5066 which is the channel without the selectone feature.
This simple mod involves changing out 3 resistors and 1 signal cap.

All K150 and 250 amps made after 11-5-71 will already have this mod.

If your amp was made after this date then you might want to remove the 4 10/32 screws from the bottom, slide the amp out the back and then remove the lid from the top of the amp which it should still have unless someone was in there already.

Once in there you will find the boards get interconnected by plug in cables.
You should unplug these and get some electromotive spray cleaner from a auto parts store and give both ends a good shot and then plug and unplug them a few times and you might find that' your low volume issue will go away.

If your 250 has no serial number plate on it's rear then you can date it by the numbers stamped on its power transformer, or on the control pots on its circuit boards, or even on its two big power supply filter cans on the floor of the chassis as all of these have date codes on them.

If you need more help, then reply back.

Also note that until you make 5 post I will have to approve them first before they go up to the board.
If you want make 4 more post in a row that just say test and I will delete them all at once and then you will be set!

[Updated on: Fri, 22 January 2021 11:45]

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