Lucky me ....

[popov56]

I've been chased to put stuff in the loft for ages, so long I can't remember, but its been so cold up there I couldn't face it. Yesterday it was a bitty warmer so I heaved my arse up through the hatch ........ and got entranced with rummaging through stuff that's been there for nearly 20 years and which I've had for longer than that.

Much specialised radio stuff from my amateur days, nucleonics connectors, valves, that sort of stuff ....... but also;



The best (I think) being 6 metal can AC 128 trannies ....... I just hope they're good ones.

Does anyone know what BC547, 548 and 558 and 2N2222A can be substituted for?

Popov

[IvIark]

Nice find.  The BC547 and 548 can be used in any circuit needing an NPN silicon transistor.  The suffix letter (A, B or C) tells you how much gain they have, but it should be a good sub for pretty much anything requiring a 2N3904, 2N5088, 2N5089 etc.

BC558 would make a good alternative to 2N3906, 2N5087 or similar PNP silicon.  Or maybe one of the BJF or Mad Professor pedals which uses the BC560.

[Silver Blues]

And the 2N2222A is maybe the most common NPN BJT out there... lol

--Silvie

[popov56]

I've no idea what I bought this stuff for, or where it came from. At the time, anything with less than 2000 volts at half an Amp seemed too whimpish to build so I couldn't have been thinking of pedals.

My playing set up was a Dan Armstrong plexi though an Orange Squeezer (both bought from Mr Armstrong in London in 1976) into an MXR Distortion + (bought from Pete Cornish when he had a workshop in Covent Garden in London, probably in 1978 or 79) into a 1955 tweed Champ in mint-ish condition, bought for £35 ......... how times have changed.

Interestingly, at the time Mr Cornish was building a lot of pedal boards and he was using transformer isolation between units rather than buffers.

Popov