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5-1/2 digit DPM?
For less than ~$100 in parts you can build your own. For example see the last page of https://www.digikey.com/htmldatasheets/production/80467/0/0/1/ltc2485-datasheet.html. The ltc2485 is a 24 bit ADC
For less than ~$100 in parts you can build your own. For example see the last page of https://www.digikey.com/htmldatasheets/production/80467/0/0/1/ltc2485-datasheet.html. The ltc2485 is a 24 bit ADC
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By
Bruce Atwood
· #177948
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535 near Detroit $75 (not mine)
Good catch. I now note that the 535 which is offered is Grey, not blue, and has square corners. The lower left corner of the photo in question shows blue and a rounded corner case. Sure glad I did not
Good catch. I now note that the 535 which is offered is Grey, not blue, and has square corners. The lower left corner of the photo in question shows blue and a rounded corner case. Sure glad I did not
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By
Bruce Atwood
· #177790
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535 near Detroit $75 (not mine)
https://detroit.craigslist.org/wyn/msg/d/livonia-tektronix-535-vintage-tube/7271634106.html
https://detroit.craigslist.org/wyn/msg/d/livonia-tektronix-535-vintage-tube/7271634106.html
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By
Bruce Atwood
· #177754
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Extracting a buggered knob grubscrew
With regard to left hand drill bits, at the Ohio State Imaging Sciences Lab our motto was, when it comes to mechanicals: "If McMaster doesn't have it, you don't need it". https://www.mcmaster.com/ Kee
With regard to left hand drill bits, at the Ohio State Imaging Sciences Lab our motto was, when it comes to mechanicals: "If McMaster doesn't have it, you don't need it". https://www.mcmaster.com/ Kee
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By
Bruce Atwood
· #177705
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Early 7904, no readout
Thanks Dave, as far as I can tell all the 7904 manuals on the TekWiki are for s/n b260000 and up.
Thanks Dave, as far as I can tell all the 7904 manuals on the TekWiki are for s/n b260000 and up.
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By
Bruce Atwood
· #175998
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Early 7904, no readout
My new (to me) s/n B041515 7904 arrived DOA. (ebay, "not working, for parts".) With the help of my mostly trusty DSO138 I found the shorted 47/25V dipped tantalum on the -15 supply. Replaced it with a
My new (to me) s/n B041515 7904 arrived DOA. (ebay, "not working, for parts".) With the help of my mostly trusty DSO138 I found the shorted 47/25V dipped tantalum on the -15 supply. Replaced it with a
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By
Bruce Atwood
· #175986
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Rescuing 500s from tube snatchers/scavengers - how much is it worth
My 561 has a bad HV XFMR, will cryo tubes and special audio cables fix that?
My 561 has a bad HV XFMR, will cryo tubes and special audio cables fix that?
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By
Bruce Atwood
· #175701
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Added album 7004 bezel
#photo-notice
Sorry, that's 7904 not 7004
Sorry, that's 7904 not 7004
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By
Bruce Atwood
· #175421
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Anyone need 561 parts?
I'm rewinding the HV XFMR in my 561 but would not mind a backup plan. How is the T600 in yours? As an aside, does yours have a 4.3 Ohm resister in series with the 1 turn secondary for the filament of
I'm rewinding the HV XFMR in my 561 but would not mind a backup plan. How is the T600 in yours? As an aside, does yours have a 4.3 Ohm resister in series with the 1 turn secondary for the filament of
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By
Bruce Atwood
· #174418
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7A26 CH2 Readout
Use a "BNC Wrench" to hold or tighten the BNC connector. There are many different ones available or you can make your own..just a hole and a slot. Here is one that looks well made but a bit pricey. I
Use a "BNC Wrench" to hold or tighten the BNC connector. There are many different ones available or you can make your own..just a hole and a slot. Here is one that looks well made but a bit pricey. I
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By
Bruce Atwood
· #170872
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93 posts in 7 days about ESR meters IS THERE ANYTHING LEFT TO SAY?
Hear! Hear!
By
Bruce Atwood
· #167156
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Rail Probes?
Data sheet: https://www.tek.com/datasheet/active-power-rail-probes Interesting, but U$4300.00 for the cheap one. Accessories are extra.
Data sheet: https://www.tek.com/datasheet/active-power-rail-probes Interesting, but U$4300.00 for the cheap one. Accessories are extra.
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By
Bruce Atwood
· #166334
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Unique Scope Option
Perhaps to control reflected light. Reflected light goes through the filter twice while light from the phosphor once.
Perhaps to control reflected light. Reflected light goes through the filter twice while light from the phosphor once.
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By
Bruce Atwood
· #165039
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DC508A Frequency Range
See http://w140.com/smb/DC508A_SM.pdf page 1-1.
See http://w140.com/smb/DC508A_SM.pdf page 1-1.
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By
Bruce Atwood
· #164273
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2465B - Weak Readout Intensity
( I sent this some time ago but I think I only sent it to myself, I'll try again) When I was servicing TV's (mid 60's!) we carried, in our tube caddy, tiny auto-transformers that would, for most BW tu
( I sent this some time ago but I think I only sent it to myself, I'll try again) When I was servicing TV's (mid 60's!) we carried, in our tube caddy, tiny auto-transformers that would, for most BW tu
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By
Bruce Atwood
· #164073
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2465B - Weak Readout Intensity
When I was servicing TV's (mid 60's!) we carried, in our tube caddy tiny auto-transformers that would, for most BW tubes plug inline with the socket and boost the heater voltage by a volt or so. For C
When I was servicing TV's (mid 60's!) we carried, in our tube caddy tiny auto-transformers that would, for most BW tubes plug inline with the socket and boost the heater voltage by a volt or so. For C
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By
Bruce Atwood
· #163635
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Risetime calculator (in tekwiki)
Just as an op-amp (with negative feedback) nulls the voltage between the inverting and non-inverting inputs here the nulling is done with wetware and the center zero meter.
Just as an op-amp (with negative feedback) nulls the voltage between the inverting and non-inverting inputs here the nulling is done with wetware and the center zero meter.
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By
Bruce Atwood
· #163440
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535 front panel corrosion/staining?
I the corrosion/staining shown in the photos below a known problem? Can it be cleaned or has the finish been eaten? It is CL about an hour away and I'd like to know what to look for. thanks [cid:part1
I the corrosion/staining shown in the photos below a known problem? Can it be cleaned or has the finish been eaten? It is CL about an hour away and I'd like to know what to look for. thanks [cid:part1
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By
Bruce Atwood
· #162634
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7613 on Ebay
Thanks to John, Bert Trevor Dennis, David, and John H for your informative and insightful comments on the 7613 and the 7603. I've got my fingers crossed for a ham-fest on the 19th. cheers
Thanks to John, Bert Trevor Dennis, David, and John H for your informative and insightful comments on the 7613 and the 7603. I've got my fingers crossed for a ham-fest on the 19th. cheers
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By
Bruce Atwood
· #162633
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7613 on Ebay
Hi Bert, After reading the comments about the 7613 I have to agree that the 7603 is a better deal. Good luck selling your 7623 cheers
Hi Bert, After reading the comments about the 7613 I have to agree that the 7603 is a better deal. Good luck selling your 7623 cheers
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By
Bruce Atwood
· #162632
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