I have a vintage Kustom Lead 3 s on the bench and need some advice on the repair. Buddy said the amp started smoking on startup.
It had a blown output transistor and a burnt resistor (R20) which I replaced. Attached is a schematic of the power section.
Without a load and on the bulb limiter the amp has no shorts. But when I connect the speaker the amp seems to short out. Bulb is fully lit.
I checked with another cab and same issue. Speaker is fine, the jack too.
I checked the driver (Q5) if it had blown out too but it reads out fine on a component tester.
I would like to hear some suggestions as to what is going on or what to check. Should I check all the other drivers too for shorts?
Thanks in advance.
It had a blown output transistor and a burnt resistor (R20) which I replaced. Attached is a schematic of the power section.
Without a load and on the bulb limiter the amp has no shorts. But when I connect the speaker the amp seems to short out. Bulb is fully lit.
I checked with another cab and same issue. Speaker is fine, the jack too.
I checked the driver (Q5) if it had blown out too but it reads out fine on a component tester.
I would like to hear some suggestions as to what is going on or what to check. Should I check all the other drivers too for shorts?
Thanks in advance.