Black Jupiter 2000 Function generator circuit.

[johnmcgivern]

The transistors in the output amplifier circuit are all available from Cricklewood as follows:

2N3905 15p ea
2N3905A 70p ea
2N3906 15p ea
2N2219A 50p ea

Plus £3.50 P&P
Plus VAT

http://www.cricklewoodelectronics.com/Cricklewood/home.php?cat=175&sort=orderby&sort_direction=0&page=4

If you don't have an account you need to create on online, which only takes a minute or two, but it may be easier should you wish to buy any stuff from Cricklewood to do it on the phone: 0208 4500 995

Unlike valves where there are fewer substitiutes, as Mark says, many transistors are fairly generic, so if you did have any BC548/558s to hand, they'd doubtless do fine, but often, people who are into vintage valve radios aren't too well stocked up with transistors! Gerry Wells has close on half a million valves, but not a single transistor has been allowed to cross his threshold - he considers them to be a menace, second only to woodworm!

Hi David, thanks for the info I did what you suggested prod with scope and there was a signal at all the trs I tested still have a few to do.
S9/10/11 there was a triangle wave, square wave but no sine wave will have another go tomorrow to confirm everything. Never really used a scope before so need the practice. Still finding my way around the drawing.
Regards, John.