Transistor crossover - RCA

[donegone]

Hello,

I have been trying to find a crossover part for RCA 480058A R 7803 output transistor for a Acoustic 220. Also looking for the drivers 2N6474 & 2N6476. Any help would be appreciated.

[Enzo]

480058 was just the Acoustic part number. 7803 was a date code - third week of 1978.

The actual part was probably a 2N3055 selecte3d for voltage. In this day and age, I would replace the whole batch of them with MJ15003. DOn;t mix types. Allied currently has 127 of them in stock at $3.31 each. Mouser is cuurently out of stock, at similar price.

2N6474 was a TO220 4A 120v 40w NPN. 2N6476 was the same in PNP. Ancient. I'd be tempted with TIP41C/42C but at 100v, they are just barely enough since your circuit runs on about 90v. So I'd replace them with the MJE15030/MJE15031 or even MJE15032/MJE15033. Those all sell for about 80 cents each.

[jrfrond]

You can't go wrong with MJ15024 as an NPN power transistor replacement. It's heftier than the 2N3055 ever was.

If you want 'em matched for current-sharing and hFe and have access to Crown parts, they do all of the work for you.

Again, with the 2N6474/6, I believe I have those in stock and can check tomorrow. We acquired parts stock from another shop several years ago, and I just got around to getting them all inventoried and binned. We have TONS of old stuff in stock that I never thought I'd ever need again!