Advice please, I have just reconditioned a quad 303 and within that replaced transistors 38495/6 on the driver boards and 38495 on power supply board. Anyone who knows these amps will be aware that the previous transistors had a flange which quad utilised to place a large metal heatsink over the transistor, however, the replacements (BC441 and BC461) do not have this. You can still attach the heatsink however, the thermal contact area is far reduced. Some Quad enthusiasts have said this is ok as the components are not being pushed hard and thus don't generate significant heat. Space is minimal and even the small TO-5/39 heatsink is a squash. Has anybody else encountered this?
replacing to-39 transistors Quad 303
- Thread starter kenworthy
- Start date
neiljadman
Senior Member
To39 & TO5 are the same dimensions. I have used these and they fit perfectly: http://www.mouser.com/Search/Produc...000Gvirtualkey53210000virtualkey532-323005B00