B & O transistor from about 1985

Any reasonably specified general purpose TO-92 type should be a perfect substitute.

Graham

Nigel,

This sound suspiciously like a 'digital switching transistor' which is usually just a bi-polar device with built in resistors. For example, a DTA115 (pnp) or a DTC115 (npn). You can do a google search on either number, or try

and try either number to see if they are similar to what you are looking for.

Unfortunately, this type of device seems to have become quite popular in recent years, and they are so small that the full number is not marked on them. Also it is hard to know which series of device you have from looking at them, as each manufacturer seems to have its own numbering system.

Regards, Tim Schwartz Bristol Electronics

circuit/

flat

?

Its that sort of size but about half the transistors in this music centre are of that size so unlikely. Also that one and the others check out "double diode" test with DMM as normal pnp transistors. Agreed any old, correct pinned, 30 to 100mA Ic pnp TO92 would do but I would like to establish some sort of generality

The other ones npn etc, in this unit, of this small format, are lablelled

603 and M21 instead of 115. Looking in the Beocenter manuals that I have, I cannot see this package in the the gallery of transistor packages used in those units.

Perhaps they were a Danish manufacturer of mid 1980s

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

Usually the number is there but the DTA/C isn't.

Graham