VintageKustom.com: Comment Board » Serial Number Chart

Re: Serial Number Chart [message #27966 is a reply to message #11377]

Fri, 22 January 2021 11:33

stevem
Messages: 4736
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]

Report message to a moderator