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Re: Tekscopes at the Computer History Museum
These dates sound correct: I remember reading the introductory data sheet for the 4004 in 1971 or 1972. It made no sense at all. I couldn't figure out what it was. I was used to logic gates and this
By Dennis Tillman W7pF · #70193 ·
Tektronix 2712/2710/27XX 300Hz Filter F.S.
Hello All: I currently have a Tektronix 300Hz filter for the 27XX series Spectrum Analyzer's for sale. If interested please contact me off the reflector. 73 Rich, AJ3G
By Rich Miller · #70192 ·
Re: 7603 no trace
David, More for you below. Hope it helps: I think you measured the "high" side of R860(the 130V supply line). Maybe I should have said measure the collector of Q860; this is the same as the base of
By jtjewell83 · #70191 ·
Re: Power supply problem with Tek 2220
Hi Francis, You are spot on. There is no stupid question. After I downloaded the 2230 (as directed by Tom) and compared with the 2220/2230. Immediately, I notice the difference. The 2220/2230 has a
By Tan Chor Ming <jonray03@...> · #70190 ·
Re: Tekscopes at the Computer History Museum
Hello, Tom and the group-- IIRC, the 8080 was introduced in 1974; the 4004 was introduced in 1971. In the early 1960s, I worked as a co-op student at a company that manufactured magnetic-core logic
By Brad Thompson <brad.thompson@...> · #70189 ·
Re: Tekscopes at the Computer History Museum
I worked at Bendix Communications Division from '66 to '71. Even had my own 545 Tek scope. They were the days. DTL had just arrived and a lot of military systems were just being converted to the pure
By Tom Miller · #70188 ·
Re: Tek 7k plug-in prices rising...
China has finally re-valued its currency! ________________________________ To: TekScopes@... Sent: Sunday, January 22, 2012 4:44 PM Subject: [TekScopes] Re: Tek 7k plug-in prices rising...
By G. K. <glkinst@...> · #70187 ·
Re: Tekscopes at the Computer History Museum
I defer to your superior knowledge of the history of computers, Steve, but I think you contradicted yourself. During the Civil war the new battefield howitzers didn't have the help of digital
By KB6NAX · #70186 ·
Seeking 5L4N manual
Anyone know where I can download a manual for the 5L4N? Thanks, AL
By allegretto2a · #70185 ·
Re: Need Manual for Type W, SN 4560 & 5336
Bernd and Egge, I was aware of the change from Nuvistors to FETs in the 1A1, but didn't know a similar thing had happened to the Type W. If you are able to find the mod kit, would you mind scanning
By Aaron Taylor · #70184 ·
Re: Total beginner with newly acquired 475 with issues
Hi "newbarrie"' There is far more expertise on this forum than mine but here are some points to get started with, but not specific to the 475: Scopes (and all electronics) that have been sitting
By KB6NAX · #70183 ·
Re: Force DSA-602 to proceed past 11A34-induced POST error?
It looks like David and Javier were right and this plugin was just missing some sort of calibration constant, fixed by running EA on a good DSA 602 mainframe. I have now been using it for one week, in
By Aaron Taylor · #70182 ·
Re: Tek 7k plug-in prices rising... 7L13/7L14
If the only thing wrong with the 7L13 is a broken knob, then I think $1k is a reasonable price. Microwave spectrum analyzers are always expensive. Though a 7L13 or 7L14 is on the low-end of the
By Robin Whittle · #70181 ·
Re: Tek 7k plug-in prices rising...
They just forgot to put the decimal point in when typing the price. If you check the sales history, they sold one unit for almost exactly 1/100 of the price in that listing. I wonder what the listing
By Aaron Taylor · #70180 ·
Re: Tekscopes at the Computer History Museum
In 1967 I worked at Bendix Aerospace and saw this F4 autopilot on the floor of one of the factories. I believe Bendix designed it. It is indeed an electromechanical monster. I always wondered how they
By Dennis Tillman W7pF · #70179 ·
Re: Tek 7k plug-in prices rising...
Perhaps that's in HK $ ?? 73, Dick, W1KSZ
By Richard Solomon <dickw1ksz@...> · #70178 ·
Re: Tek 7k plug-in prices rising...
Have you seen the BIN price for this? Item 270788500453 Joe
By J. L. Trantham · #70177 ·
Re: Tek 7k plug-in prices rising...
Magnus, don't worry, maybe the prices in the past was to low ??? just found: 7L14 Spectrum Analyzer: ONLY $1,499! (SOLD!) from a US used electronic seller So, they expect more, keep your eyes open ;-)
By Heinz-Peter Deutsch · #70176 ·
Tek 7k plug-in prices rising...
Hello, The winning bid for this one leaves me stunning. It comes with no warranty and has a broken knob as per the item description... I have no disbelief in the 7L13 spectrum analyser's quality and
By magnustoelle · #70175 ·
Re: 7603 no trace
-67.6V 71.8V ( no sign of cracked solder pads.) R860 = 12KOhms ( with R860 in place on pcb )
By David Miles <bwex@...> · #70174 ·