oren hudson Messages: 274 Registered: March 2008 Location: Gastonia, NC
Senior Member
I've had this '71 Kustom 250 bass head for over a year. I've just now started on the rehab on it. When I opened it up, I saw a large sheet of paper just laying on top of the innards. I picked it up, turned it over. The original schematics! I've taken apart dozens of Kustom heads over the years, this is a first for finding the schematics inside. Very cool find.
Yeah all three of my 250's had the schematic inside of them. To bad none of my 200's had them in them. Goes to show that the 250's didn't need as much maintenance to keep them running like the 200's. If you don't have to open them up you can't loose the schematic.
stevem Messages: 4728 Registered: June 2004 Location: NY
Senior Member
I sold a 250 last year that also had a mod list stuck to the schematic that stated that it had the gain mod done to it.
I have never seen that in all the other 250s and 150s I have worked on over the years!
stevem Messages: 4728 Registered: June 2004 Location: NY
Senior Member
it's a mod for more gain on the preamp PC-5066 board that was issued in November of 71.
It involves 3 resistors and a cap, if your amp was made after this it has the mod done already and I have found that if you play a axe with active pickups your better off with out it, but to each his own!