BD505 transistor replacement

Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

I found a BD505 hidden behind a heatsink that I suspect is the cause of intermittent noise. This is a 250V 4 EL509 tube push pull setup.

I can't locate a direct replacement in Digikey and am loathe to trust NOS from eBay. Any current production transistor recommendation. I can't clearly see the package but is a round black case through hole type and must run hot.I cannot see how it attaches to the heat sink except by being pressed against it.
.
must..NOT..resist..."upgraditis"

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Michael Percy Audio

Topic - BD505 transistor replacement - valvesonly 20:16:52 02/09/16 (2)

That is nothing more than a general purpose NPN audio amp - Michael Samra 23:57:41 02/09/16 (1)

Thanks, I will do that. nt/ - valvesonly 18:59:07 02/10/16 (0)

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