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Re: Tek 422 HV power supply issues
Resistors looked more or less OK, that was one of the first things I checked. The 2 2.2M in series had drifted down to 4.2M, while the 1M focus was up to 1.2M, so more or less a wash. More
By Paul Amaranth · #87985 ·
Re: What use for a 640 Ohm 1x Probe?
This probe (it says Fairchild Scientific Instruments 106 on the cable) is a good 1x probe. I bit the bullet and tested it on a scope compensation signal and it has a slight overshoot but a very flat
By Philip McIntosh · #87984 ·
Re: 7K extenders
Thanks Craig, Craig was referring to his spreadsheet with tallies of types of wire used, (but not their wire gauge). Since an original Tek extender uses 58 thin wires, and only 4 thick wires and 6
By John Griessen <john@...> · #87983 ·
Re: TroubleShooting Some TM500 gear.
I'm with Tom. I ordered the arcade cards first, then got two sets each of the TM500 and 7000 extenders from John. Much, much better IMO. Mark
By Mark Wendt (Contractor) <mark.wendt@...> · #87982 ·
Re: DC504 counter display
Other possibles listed by DoD WEBFLIS include MAN10 (Monsanto, probably hard-to-find) and TIL302 (Texas Instruments) - try Lite-on for a cross reference. Mouser carries Lite-on, so their drill-down
By taylorvandy · #87981 ·
Re: PYRAMID CALIBRATOR AND TESTER FOR TEKTRONIX OSCILLOSCOPES
Thanks for the links Dave Daniel.
By Gala Dragos · #87980 ·
Re: OT: was Re: Re: replacing 475 psu electrolytics
Austin 10 1936, 3 landrovers (serie 2a from 1970, defender 90 V8 50th annyversary from 1998, a 90 Td5 from 1999) a Triumph speedtwin (1954) and a EML bermuda trike ( based on a 1998 Honda GL1500
By PA4TIM · #87979 ·
Re: DC504 counter display
You could look to see which other instruments Tektronix used part number 150-1018-00 in to widen your selection of parts mules. Also, you can reverse engineer the pinout from either the
By David Hess · #87978 ·
Re: DC504 counter display
Tnx to the group for the suggestions on my DC504 display. I swapped one display digit with another & the problem followed the swap. So, the consensus of the group that it was a display problem
By HankC, Boston, WA1HOS · #87977 ·
Re: Type M01 'scope
Photos would be nice. -Kurt
By sipespresso <sipespresso@...> · #87976 ·
Re: Frequency response flatness in conventional sampling (say 7S11/S
Sorry for taking a while to get back to you on this. It seems it is time for me to add an S-6 manual to my binder of sampling stuff. Here is why I do not believe the blow-by matters in this
By David Hess · #87975 ·
Re: What use for a 640 Ohm 1x Probe?
I should have been more specific. Actually I get about 9.3 MOhms on the 10x probe I checked. I am learning a lot though by thinking about this probe, reading everyone's comments and reading the
By Philip McIntosh · #87974 ·
Re: Type M01 'scope
I picked up the M01 scope and took it over to the VintageTEK museum for a closer look. It turns out that before the 7000 series got its name Tek developed two products called the L01 and the M01. The
By Dennis Tillman W7pF · #87973 ·
Re: TroubleShooting Some TM500 gear.
I might add that your cards are much higher quality than the ones from the arcade guys. Regards, Tom
By Tom Miller · #87972 ·
Re: TroubleShooting Some TM500 gear.
I have plenty of TM500 cards for sale as kits, but I will also sell a card set, no connector, to make a plug with, no wires, shipped in a flat envelope for
By John Griessen <john@...> · #87971 ·
Re: Tek 422 HV power supply issues
Hi Paul -- Check the resistors in the series string where the focus & intensity pots live. Your voltages aren't that far off the mark. Per the schematic, 'normal' should be a bias of around -45 V.
By teamlarryohio · #87970 ·
Tek 422 HV power supply issues
So I'm looking at this 422 and the trace doesn't get visible until the intensity control is around 3 o'clock. Blanking is adjusted, so that's not the problem This doesn't seem right, so I dug out
By Paul Amaranth · #87969 ·
Re: [hp_agilent_equipment] Surplus outfits in Philladephia, PA (USA)?
Sort of relevant to the thread... here's a nice lot of (mostly) Tek scopes in Belmar, New Jersey, not too far from Philadelphia: http://www.ebay.com/itm/230931778253
By David DiGiacomo · #87968 ·
Re: Now: 50 Ohm attenuator Re: What use for a 640 Ohm 1x Probe?
OK, I think I've decided on building a unit inside a little box that can be switched between 1x, 10x, and 100x. I assume I'd just put the resistors in an "L" pattern totaling 50, 500, and 5,000
By Cliff White · #87967 ·
Re: PYRAMID CALIBRATOR AND TESTER FOR TEKTRONIX OSCILLOSCOPES
It's not a pyramid unit.? It's made by Tektronix. If you want one, send the money to me and I'll ship it to you. Bob R.Balbert 9229 Valjean North HIlls California 911343
By Bob Albert <bob91343@...> · #87966 ·