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Dennis Tillman
My last email to him was in Sept last year asking if he received the 7CT1N service manual I sent him, never got a reply. Chuck
My last email to him was in Sept last year asking if he received the 7CT1N service manual I sent him, never got a reply. Chuck
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ChuckA
· #190838
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Working 549
I'm interested in the scope. It's one of the few models I don't have yet. If you are near Indy I can have it picked up by a friend. Chuck
I'm interested in the scope. It's one of the few models I don't have yet. If you are near Indy I can have it picked up by a friend. Chuck
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ChuckA
· #190682
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TEK 1L10 SA
I am working on a 1L10 SA module and was wondering if anyone has any experience on these. The only manual I can find is from the TEK Wiki site, it is good with schematics and theory but very little on
I am working on a 1L10 SA module and was wondering if anyone has any experience on these. The only manual I can find is from the TEK Wiki site, it is good with schematics and theory but very little on
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ChuckA
· #189661
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HV transformer core disassembly
I tapped a razor blade between the two halves at the glue joint and it came apart easily. Maybe it was just a fluke, will know when I try another one. Chuck
I tapped a razor blade between the two halves at the glue joint and it came apart easily. Maybe it was just a fluke, will know when I try another one. Chuck
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ChuckA
· #188230
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492BP fuzzy trace on left side of crt - any ideas on what to look for?
A couple years ago I bought an HP 8753B Network Analyzer with test set that was cheap (under $400) as it was listed not working, bad CRT. I took a chance on it. Got it home and just had to clean the b
A couple years ago I bought an HP 8753B Network Analyzer with test set that was cheap (under $400) as it was listed not working, bad CRT. I took a chance on it. Got it home and just had to clean the b
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ChuckA
· #187284
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TEK R568
Steve, I have learned that lesson the hard way also, find it, buy it and take it now. The scope price was too good to pass ($30) and I have had the manual for the 230 for years and thought it would be
Steve, I have learned that lesson the hard way also, find it, buy it and take it now. The scope price was too good to pass ($30) and I have had the manual for the 230 for years and thought it would be
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ChuckA
· #186764
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TEK R568
I recently picked up an R568 with 3S6 and 3T6 plugins. I'd like to find a Model 230 Digital Unit for it. Would prefer a rack mount unit but not going to be particular. Anyone have one for sale or trad
I recently picked up an R568 with 3S6 and 3T6 plugins. I'd like to find a Model 230 Digital Unit for it. Would prefer a rack mount unit but not going to be particular. Anyone have one for sale or trad
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ChuckA
· #186741
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[OT] Amplification before tubes existed
If you're interested in the practical use of this mechanical amplifier look at patents 712930, 783750, 796743, 876350 The last two are for actual production phonographs produced between 1905 & 1908. C
If you're interested in the practical use of this mechanical amplifier look at patents 712930, 783750, 796743, 876350 The last two are for actual production phonographs produced between 1905 & 1908. C
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ChuckA
· #186144
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[OT] Amplification before tubes existed
Go to USPTO site: https://patft.uspto.gov/netahtml/PTO/srchnum.htm Enter patent number in Query box then Search, then Images Most early patents are only available as images. Chuck
Go to USPTO site: https://patft.uspto.gov/netahtml/PTO/srchnum.htm Enter patent number in Query box then Search, then Images Most early patents are only available as images. Chuck
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ChuckA
· #186143
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Somewhat OT- WTB tiny CRT scopes
The RCA 1" CRT is a 913. RCA used in their 1936 Model 151 scope, National used it in their Model CRM, Clough-Brengle 1935 Model 105, and a number of homebrew scopes in the mid 30's. Pictures: http://w
The RCA 1" CRT is a 913. RCA used in their 1936 Model 151 scope, National used it in their Model CRM, Clough-Brengle 1935 Model 105, and a number of homebrew scopes in the mid 30's. Pictures: http://w
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ChuckA
· #186114
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[OT] Amplification before tubes existed
Around the turn of the 19th century Daniel Higham invented a mechanical amplifier for use on early acoustic cylinder phonographs. The original patent is #678566, it's easier to read the patent than tr
Around the turn of the 19th century Daniel Higham invented a mechanical amplifier for use on early acoustic cylinder phonographs. The original patent is #678566, it's easier to read the patent than tr
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ChuckA
· #186043
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Tektronix 570 Curve Tracer
Martin, I read your posts about using the Metrix with a 576, got me thinking about trying the same thing with my New London 901A Transconductance Analyzer. Seems to be similar to your Metrix, all conn
Martin, I read your posts about using the Metrix with a 576, got me thinking about trying the same thing with my New London 901A Transconductance Analyzer. Seems to be similar to your Metrix, all conn
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ChuckA
· #185697
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Tektronix 570 Curve Tracer
I bought a couple of Dennis's VTCT boards when he first produced them. I built a couple of crude adapters to use on my 576 which worked pretty well but were cumbersome to use. I didn't like the use of
I bought a couple of Dennis's VTCT boards when he first produced them. I built a couple of crude adapters to use on my 576 which worked pretty well but were cumbersome to use. I didn't like the use of
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ChuckA
· #185549
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TEK 7504
Does anyone have a readout board (670-0635-01) for a 7504 scope they would be interested in selling or ? Contact me off list. Chuck -- See Early TV at: www.myvintagetv.com
Does anyone have a readout board (670-0635-01) for a 7504 scope they would be interested in selling or ? Contact me off list. Chuck -- See Early TV at: www.myvintagetv.com
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ChuckA
· #182615
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WTB: Tek 576 and P6015A
Chris, Sorry no, I am using both of them. One is dedicated as a tube CT, the other for semiconductors. Chuck
Chris, Sorry no, I am using both of them. One is dedicated as a tube CT, the other for semiconductors. Chuck
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ChuckA
· #182613
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577 D2 question(s)
The CR70 has 2 functions REJUVENATE and RESTORE. From the manual: In REJUV function, cathode and G2 are tied together. Normal filament voltage is applied and a 1K ohm resistor is in series with discha
The CR70 has 2 functions REJUVENATE and RESTORE. From the manual: In REJUV function, cathode and G2 are tied together. Normal filament voltage is applied and a 1K ohm resistor is in series with discha
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ChuckA
· #182392
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577 D2 question(s)
I've had good luck using a Sencore CR-70 restoring a TDS-648A and a HP3562A CRT, both were so dim as not usable. Running the filament about 40%-50% higher for a time was a old method to sometimes make
I've had good luck using a Sencore CR-70 restoring a TDS-648A and a HP3562A CRT, both were so dim as not usable. Running the filament about 40%-50% higher for a time was a old method to sometimes make
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ChuckA
· #182341
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577 D2 question(s)
Andy Removing the HV board is a PIA as you have to unsolder 11 or so connections on the top of the board and a screw holding the heat sink for the oscillator transistor before you can work it out. Get
Andy Removing the HV board is a PIA as you have to unsolder 11 or so connections on the top of the board and a screw holding the heat sink for the oscillator transistor before you can work it out. Get
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ChuckA
· #182211
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Transporting a 500-Series Scope without Breaking the CRT
Jeff Most of the scopes I've picked up have been in storage for many years and lots of dust. I usually just do cleaning with a compressor for dust and loose dirt and lots of elbow grease for stubborn
Jeff Most of the scopes I've picked up have been in storage for many years and lots of dust. I usually just do cleaning with a compressor for dust and loose dirt and lots of elbow grease for stubborn
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ChuckA
· #182176
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Transporting a 500-Series Scope without Breaking the CRT
I've been reading this thread and am wondering what 500 scope are you moving and how far? I've moved many of them in the back of my truck just wrapped in a moving blanket and secured so they can't sli
I've been reading this thread and am wondering what 500 scope are you moving and how far? I've moved many of them in the back of my truck just wrapped in a moving blanket and secured so they can't sli
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ChuckA
· #182164
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