Discussion in 'Ham Radio Discussions' started by KL7AJ, Oct 7, 2019.
Was that Pre-Papyrus?
My first and only OC170 cost one day wages in fifties.
It was NOT Chinese made then.
But we had boxes of "surplus" tubes , including black metal US 6K7 - used for decorations...
Used in home brew 10W CW TX for 80 meters.
Made my first DX contact with it - from OK to OZ !
Remember, yes, but that was AFTER my time.
Clearly never took the brown acid
I never did it, nobody saw it, and you can't prove it. And I'm sticking to that story.
Schematic from a Swedish journal in 1958 about the introduction of the OC170.
Shows a self-excited mixer for "short-wave"
Price-list from 1959 showing prices for the OC170 and OC171:
The single-unit price for the OC171 roughly corresponds to 1/2 day's wages in 1959
for a male worker in the radio-repair business, and 2/3 day's wages for a female...
So, did we decide if he's old, or something? Or both?
I blew up my 1973 Heathkit HD-10 keyer at the San Diego Hamfest. Two 2N408s were blown. I plugged in a pair of 2N2907s and they worked fine
It's always been my rule----If they have the same number of pins, are about the same size, and are the same "family" (NPN or PNP) , they will probably work in most non critical circuits.
Leading on from that, but perhaps a bit "off topic":-
Have you noticed , as I have, over the years, how manufacturers will use the same device in critical & non critical circuits to reduce the number of types they have to stock.
In many cases, you can steal one from the non-critical spot to fix the more "touchy" one, & use a 2N2222, BC108, or whatever, in the former position.
I was once (1970) happily employed by an electronic outfit as a tech.
Had a "job" sorting and color coding transistors , they may have been 3904 , according the beta.
We were making "stuff" to put inside old Liberty ship being converted from sugar cane carrier (!) to "military service".
The electronic was ho - hum. but crawling around "one way ship" was fascinating.
Trivia and Liberty ship quiz
They were allegedly buidl at the rate of around 3 a day
And why they were called "one way ships"?
Hint - nothing to do with U-boats activities