Spare Parts....

Turned on the old Tek 547 to do some work yesterday morning, the traces came up, and the trace looked kinda strange. Finally realized there was no retrace blanking on the "A" time base. Found a bad 2N2207 in the blanking circuit. After an hour of searching on the net, I found one, NINE BUCKS for a 40 year old TO-5 PNP ho-hum transistor (gotta keep it original Ya Know). Worse yet, I had to buy 6 of em to get to the fifty buck minimum.

Good part is, I'll never have another one fail.

At least you got the part you need!

Gene

I think the 2N2907 would also work fine, and a lot easier to find.

Dave

Hi Dave,

Yup You're right, looks like it would, but I jest can't imagine a little 29 cent plastic part working as well as a shiney nine buck metal one. Besides, I only got 75 or so of those little plastic jobs.

To be honest, I never gave it a thought. There were alot of excelent devices in the 2000 and 3000 series of transistors.

hello Mike,

you remember, the old time of homebrew sw remotes for little cars and ships?
250mW output, delivered from a germanium mesa transistor, a thick round one with 4 pins (pin4 = shield, case)...

Here in germany we soldet AF118, what is full compatible to your 2N2207.
A very old 27mc remote TX may contain one, or two, look in the junk box first :-)

greetings
Martin

Mike, I had a bunch of the NTE equivalents here both new and used. Would have been glad to send you one.

Don't you just hate these offers after you buy some?

If you do need anything else though, just ask.

Cheers, Bob

Thanks for the offer Bob. You're right, that's the way it works, You need it, and I just threw out half a dozen of em yesterday.