Gibson G30

[pnut5150]

It is a BC109..are there any crossover parts for it?

[Jazz P Bass]

BC109 - MULTICOMP - BIPOLAR TRANSISTOR, NPN, 25V, TO-18 | Newark element14 US

[J M Fahey]

If you have to order it specially, go ahead and buy the same, cost is peanuts.

But the modern version is BC549, in case that old one disappears, and in fact, any small (TO92) NPN transistor will work there.

Just check pinout and if needed twist legs slightly to match.

So maybe you already have something in your parts bin.

[pnut5150]

Thanx!

[pnut5150]

I put a transistor in, if I hook up what I believe is the base, I get a hum, if I leave it unhooked I get audio, but weak and distorted

[Jazz P Bass]

Which transistor did you 'put in'?

And what is the designation number on the schematic?
Or if you are not sure, which circuit?

[pnut5150]

I don't remember which transistor I put in, it is a npn TO92 case. I tried several different ones. I ordered the original replacement. It will be in one day this week.

[Jazz P Bass]

BC109 pinout.pdf
Just make sure that it is installed correctly.
There is a tab on the BC109 transistor case which indicates the base lead.
Edit: the emitter is tabbed
Sometimes there will be a silkscreened marking on the PCboard itself.

You never did specify which transistor (schematic wise) you snapped off.
And which transistor you tried to sub.

The pinouts where most probably not the same.
As JM F stated, any 25 volt transistor should work. (assuming that the correct lead configuration is observed.)

Look up the datasheet for any substitution part before throwing it at a circuit.

[J M Fahey]

Sorry but the tab shows the emitter.





http://www.farnell.com/datasheets/314715.pdf

So recheck it.

And please which transistor in the schematic did you replace.

And why, what made you suspect it (besides broken legs when you touched it) .

[Jazz P Bass]

Yup.
the emitter is tabbed.
Blind as a bat.
Thanks JM.

[pnut5150]

I used a 2N3904. I broke the legs moving the transistor. Amp has been in a damp building, looked like rats had been living in it. Amp was working except for tremolo, when i broke the legs I have no sound.