Hello John,
I also had a time delay to allow filaments and other stuff to come up. This was usually the only transistorized part in the whole amp. But, I have to admit that I had often grossly exceeded the plate current abs max limit. This was in the college days when the $20 for a couple more tubes were an insurmountable hurdle. Or let's say a priority hurdle because $20 also bought you two crates of Grolsch :-)))
Yeah, I used to pay $7 for a CK722 whan you could get a steak and a baked potato at the Buck Forty Nine restautant for, as I recall, $1.49. And a Chinese lunch with coffee or tea and ice cream for dessert was 85 cents. Hell, 1/4 watt carbon resistors cost 12 cents each, and my allowance was $2 a week. Thank goodness for scrap TV sets.
During my college days, at Houlihan's on Bourbon street, oysters were
10 cents each, and draft beer was a quarter, and the cheapest tunnel diode was about $3.50 (no, not at Houlihan's!) Now a single oyster can buy a hundred opamps.John
Yeah. AFAIK a non-issue under normal circumstances, but some less absormal circuits and tubes can actually have appreciable wear.
Tim
Hello John,
Oh yeah, I carted lots of TV sets home on my bicycle. In Europe we could not buy the CK722. We had the old AC127 and for RF stuff the expensive AF116. So I used triodes from TV tuners which were much better and free.
And it's probably not even as good as they used to be (the oyster). As a kid none of the shops ever had tunnel diodes. To us they remained boutique parts, mentioned in many electronics recipes but unobtanium for anyone without a fat defense budget.
Today kids could get some miracle parts for a song but most aren't interested. Beer for the grown-ups is another matter. A growler of fresh brew is now up to $10 out here. Ouch. Maybe time to start brewing our own again.
I was going to ask about this before I read the above.
air...20 kV/inch
20 V/mil 0.8 V/um 0.08 V for 0.1 micron die featuresSo I guess you're right about thin films.
Hello Tom,
That depends on which air. In many large US cities it seems people trust air only when they can see it ;-)
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