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Only one of the four MOSFETs didn't short out, but I have to replace it anyway—partly out of suspicion and partly because the new ones are different. A 27-ohm resistor connected to one of the blown MOSFETs is also open; I didn't see anything amiss with the power stage drivers (C4793 and A1837).

The problem is that I can't find the 2121/5949 pair—it seems to be discontinued—and the IRF640s have also been replaced by the 640N. That’s why I’m looking for replacements for the Toshiba pair, and I was wondering if the 1943/5200 might work.

Jimmy Rodgers HoneyComb (1957)

The Tarriers The Banana Boat Song (1957)

Ricky Nelson A Teenager's Romance (1957)

Paul Anka Diana (1957)

Ferlin Husky Gone (1957)

Deep Purple Burn ❤️‍🔥

Chuck Berry School Days (1957)

The Coasters Searchin (1957)

Sam Cooke You Send Me (1957)

The Everly Brothers Wake Up Little Susie (1957)

Welcome!!!! Great to have you with us.

Welcome!!! Great to have you with us.

Fleetwood Mac Go Your Own Way

Spirit Natures Way

Del Vikings Com Go With Me (1957)

Marty Robbins A White Sportcoat & A Pink Carnation (1957)

Elvis Presley Jailhouse Rock (1957)

Harry Belafonte Day-O (Banana Boat Song) 1957

Elvis Presley Let Me Be YourTeddy Bear (1957)

Buddy Knox Party Doll (1957)

Debbie Reynolds Tammy (1957)

The Everly Brothers Bye Bye Love (1957)

Welcome to the site!!!