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From: Leythos on 22 Mar 2010 19:15 In article <ho8q7m$78n$1(a)news.eternal-september.org>, erratic(a)nomail.afraid.org says... > > "David H. Lipman" <DLipman~nospam~@Verizon.Net> wrote in message > news:ho8kmp01o0d(a)news3.newsguy.com... > > > I built push-pull power amps via 6L6's and my favourite tube was the > > 4CX1000K. > > I never thought of a favorite tube - but I guess the reflex klystron, > the magnetron, and the travelling wave tube (radar and microwave). I > like the way circuits start to resemble tin cans and echo chambers in > the microwave region. > > > Additionally I built Zenith/Heatkits. A 5MHz oscilliscope and a > > Colour Dot and Bar > > Generator (to adjust colour convergence on TV sets). > > Nice. Heathkit's are cool - and useful. Do you remember the "Magic Eye" tubes used in AV hardware to show signal levels (like recording levels)? I built a lot of Heath kit Z-89 computers -- You can't trust your best friends, your five senses, only the little voice inside you that most civilians don't even hear -- Listen to that. Trust yourself. spam999free(a)rrohio.com (remove 999 for proper email address)
From: David H. Lipman on 22 Mar 2010 19:31 From: "Leythos" <spam999free(a)rrohio.com> | Do you remember the "Magic Eye" tubes used in AV hardware to show signal | levels (like recording levels)? | I built a lot of Heath kit Z-89 computers I do :-) I used them in capacitance checkers that used a bridge tuning circuit. The "Magic Eye" would show a green phosphorous glow at 270 degrees and as you rotated the dial and "tuned" the bridge the "Magic Eye" would go to 360 degrees. When it did, you read the value on the dial, used the multiplier, and that was the Capacitance value. G-d, I miss that Zenith/HethKit store. :-( -- Dave http://www.claymania.com/removal-trojan-adware.html Multi-AV - http://www.pctipp.ch/downloads/dl/35905.asp
From: Leythos on 22 Mar 2010 19:45 In article <ho8ulf0202v(a)news3.newsguy.com>, DLipman~nospam~@Verizon.Net says... > > From: "Leythos" <spam999free(a)rrohio.com> > > > | Do you remember the "Magic Eye" tubes used in AV hardware to show signal > | levels (like recording levels)? > > | I built a lot of Heath kit Z-89 computers > > I do :-) > > I used them in capacitance checkers that used a bridge tuning circuit. The "Magic Eye" > would show a green phosphorous glow at 270 degrees and as you rotated the dial and "tuned" > the bridge the "Magic Eye" would go to 360 degrees. When it did, you read the value on > the dial, used the multiplier, and that was the Capacitance value. > > G-d, I miss that Zenith/HethKit store. :-( We had a ATT salvage yard around here when I was growing up - they would dump entire switching stations, in entire cabinets, meters, cards, relays, etc... Other companies would dump their hardware there too - a few years later they would not let us salvage anything.... it was great while it lasted. My first gig in the Navy was setting up CPM machines that no-one else knew how to use, had been sitting for a year+, and to think I use to build them from scratch - Here I was, an E2 working in an E6 position all because I could build and program computers. -- You can't trust your best friends, your five senses, only the little voice inside you that most civilians don't even hear -- Listen to that. Trust yourself. spam999free(a)rrohio.com (remove 999 for proper email address)
From: FromTheRafters on 22 Mar 2010 19:57 "Leythos" <spam999free(a)rrohio.com> wrote in message news:MPG.2611c3fba6e6345a98a1e8(a)us.news.astraweb.com... > Do you remember the "Magic Eye" tubes used in AV hardware to show > signal > levels (like recording levels)? Both the eye wedge style (on tuners for signal strength) and the linear (mostly on magnetic tape recorders for audio level). Okay, I've seen some awesome indicator tubes - some of my first computer experiences involved "Nixie tubes", and I worked for years replacing display tubes on high-end tuners (Sansui). Displays have come a long way. I guess you notice that sort of thing more when you start out interacting with a computer via an IBM teletype.
From: Leythos on 22 Mar 2010 20:24
In article <ho905i$rdn$1(a)news.eternal-september.org>, erratic(a)nomail.afraid.org says... > > "Leythos" <spam999free(a)rrohio.com> wrote in message > news:MPG.2611c3fba6e6345a98a1e8(a)us.news.astraweb.com... > > > Do you remember the "Magic Eye" tubes used in AV hardware to show > > signal > > levels (like recording levels)? > > Both the eye wedge style (on tuners for signal strength) and the linear > (mostly on magnetic tape recorders for audio level). > > Okay, I've seen some awesome indicator tubes - some of my first computer > experiences involved "Nixie tubes", and I worked for years replacing > display tubes on high-end tuners (Sansui). Displays have come a long > way. I guess you notice that sort of thing more when you start out > interacting with a computer via an IBM teletype. LOL, I still have a box of nixi tubes, they still work (or they did the last time I checked). Do you remember the old 5x7 dot LED displays from the HP 98437 "calculator" - had one with BASIC and math, thermal printer, even a card reader and plotter.... After I got out of the service I had a 3B1 computer, while in the service I had a Osborne 1, had a Commodore PET 2001 in the late 70's and then a SX64 while I was in the Navy on a ship, the B128 prototype directly from Commodore - still having wire-wrap sockets.... Man, those where the days, what we could do with 4K of RAM! -- You can't trust your best friends, your five senses, only the little voice inside you that most civilians don't even hear -- Listen to that. Trust yourself. spam999free(a)rrohio.com (remove 999 for proper email address) |