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When was my 28-B bass amp made? [message #27621] Wed, 01 January 2020 14:20 Go to next message
Loyo is currently offline  Loyo
Messages: 2
Registered: January 2020
Junior Member

I was having trouble tracking down this information. Here is the details of my bass amp.

Model: 28-B
Serial NO: 92650

Thanks for the help!
Re: When was my 28-B bass amp made? [message #27624 is a reply to message #27621] Sat, 04 January 2020 08:02 Go to previous messageGo to next message
stevem is currently offline  stevem
Messages: 4272
Registered: June 2004
Location: NY
Senior Member
I will look it up for you.
Re: When was my 28-B bass amp made? [message #27653 is a reply to message #27621] Sat, 08 February 2020 16:53 Go to previous message
scottyallen is currently offline  scottyallen
Messages: 4
Registered: April 2006
Location: West Point, Mississippi
Junior Member
From the chart I have it appears your bass amp was made Jul-Dec 1972 serial number range for that period shows to have been 88598-96437

Here is the copy from the information that I got your serial number from

Kustom Amplifier Serial Number Chart
S.N. range ... Estimated Production Date
00001 01399 1964
01400 03149 1965
03150 09999 1966
10000 20000 1967

20001 25242 Jan - Mar 1968 K200 A
25243 27??? Apr - May 1968 K200 A
23906 25286 June 1968 K200 B
25287 32199 Jul-Dec 1968 K200 B

32200 36434 Jan-Mar 1969
36435 40669 Apr-Jun 1969
40670 44904 Jul-Sep 1969
44905 49139 Oct-Dec 1969
49140 53259 Jan-Mar 1970
53260 56607 Apr-Jun 1970
56608 60842 Jul-Sep 1970
60843 65077 Oct-Dec 1970
65078 72917 Jan - Jun 1971
72918 80757 Jul - Dec 1971
80758 88597 Jan - Jun 1972
88598 96437 Jul - Dec 1972
96438 104277 Jan - Jun 1973

(The following could contain inaccuracies if you find any, please let me know.)
Notes/Milestones/Model changes

1) approx 00001 to 6000 (approx 1964 to mid-1966) the early Kustom model numbers and serial numbers were penciled-in. (Model #'s C595, J595, C895)

2) The first 5000 Kustoms produced had larger knobs (a stove-top knob) than later models. Knob looked similar to a Radio Shack RSU 12130852.

3) The very first cabinets had all plastic handles (black), like the ones used for guitar cases and brief cases. The handle mounts are somewhat pointed and have a different screw spacing than the handle used on later Kustoms. This all plastic handle was smaller than the handle used on later Kustoms (metal band with plastic insert).

4) approx 23900 to 24700 "Ross" (example K200A) ends (approx March-May 1968) and "Kustom Electronics" (example K200B) begins (approx June 1968)

5) Somewhere between SN 467xx and 53027 (approx Oct 69 to March 70) the K100C-8 4x10 combo went from two slots on the back to four

6) Approx SN 51500 (approx. March 1970) Kustom stopped putting an external speaker jack on the K100 combo's (2x10, 4x10, etc.)

7) Approx SN 55000 (approx May 1970) stock speaker changed from Eminence to CTS (on, for example K100C-8 2x10 combo). With the change to CTS speakers, the speaker bolt pattern became slightly larger.

Cool The basic cutoff was approx SN 75000-76000 that the plexiglass-front series ends slant-front/SS series begins, but there are many exceptions.
The Kustom SS series of amplifiers (Charger, Challenger, Commander, Sidewinder, etc.) were introduced in June of 1971 at the summer NAMM show. That series of amps were manufactured after Bud Ross sold Kustom to the Baldwin Piano Company.
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