Kustom 250-1

Kustom 250 bass amp with the tuck n roll. Not really sure why it’s called that. For me it did 98W at clipping, oh well.

This one had broken solder connections from a previous repair and was not putting out full power. Also needed a new power cord so it was a good chance to upgrade to 3-prong. Driver transistors are RCA 40409/40410 like in the old Acoustics. Unlike the old Acoustics there is one driver transistor per output transistor. Acoustics usually have one 40409/40410 driving two or three output transistors in parallel.  Output transistors in the Kustom are mounted underneath the heatsink on the bottom of the chassis.

Block diagram was the best I could find for DL. Schematic is available not for DL here. Let the good times rolllllll. Get it? Tuck n roll.   —
power amp — https://docs.google.com/file/d/0B1FxxpOmGO8vQjUxNDZ6NDBIUlk/preview?pli=1&rm=demo
preamp 1 — https://docs.google.com/file/d/0B1FxxpOmGO8vckY3MG93XzZIZW8/preview?pli=1&rm=demo
preamp 2 — https://docs.google.com/file/d/0B1FxxpOmGO8vcGFkd2xObEtyYVE/preview?pli=1&rm=demo
Catalogue page here — http://www.preservationsound.com/wp-content/uploads/2011/01/Kustom_150_250_500_Catalog.pdf