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It is a shame that Deane Kidd is no longer with us - he could always find what I was looking for no matter how obscure, and on a few occasions asked for no money and shipped it free of charge (to the

Hi Gary, The service manual should list the part number in the rear section of the manual where all of the mechanical parts are listed and referenced to an exploded view of the mechanical parts of the

I learned an interesting lesson about eBay pricing trends from the CT-1 and CT-2. Back in the first half of the new decade (approximately 2000 to 2005) the CT-1 and CT-2 sold on eBay for $25 to $35

Hi Dave, What does a 7704A with a P7001 have to do with curve tracers??? The reason I changed the topic was to separate the discussion about 500 series scopes from the discussion going on about

Hi Gary, No. There was no onscreen readout on any Tek curve tracer except (I'm mostly guessing) on their very newest ones (post 2000). Dennis Tillman W7PF

A year ago I repaired a TDS 644A power supply.with overheated VR4 and VR5 snubbers and blown Q9 switch transistor. Q9 was replaced with an MJE8501 which was pencilled in on the schematic. The

Hello Daven9ooq, I will chuck in my 2 cents worth to help you. One of the previous posters suggested that you print out the schematics. I am going to adopt a Judge Judy attitude here. Have you printed

Hello, I'm interested in purchasing my first scope and looking for opinions on the TDS744A. I'm not interested in purchasing a Rigol/Siglent, etc - not that they are bad scopes, I've used Teks before

All I have ever seen draw in at the back. The air passes through the filter first before being delivered to the interior of the cabinet. Here is a bit of fan/blower trivia: A propellor fan needs

Did the TEK factory have the fan suck air in or blow it out the back? kevin

Steve, These optocouplers in the supply have a Small circle made with a dashed line surrounding an "M". It is not a "Motorola M", different from their LOGO. I'll bet these are made by MONSANTO. Thanks

Roy, Excellent information! I am not an I.E.E.E member. I'm pretty sure that they don't take old hot rodders and motorcycle mechanics turned electronics hobbyist as members. I have followed a lot of

Where I used to work, we used optocouplers to Isolate TELCO ring from our circuit and detect ring. We found that as the opto aged the ability of the photo device to see the emitter decreased. We

Chuck, Since I cannot tell what the original Zener or avalanche voltage was on this part, I am calling it a Zener. I understand that these diodes over a certain voltage (about 6V) are not truely

Glenn, I realize all of what you have very clearly stated. However, All of the diodes on this board are marked as "CRxxx". I am not a complete stranger as to how TEKTRONIX schematics have been marked

Hi All: I.E.E.E., NASA, and the U.S. Navy, et. al., have published papers citing the significant "failure" of these "critical" components in causing SMPSs not to operate. The authors are claiming that

Steve, As a life long EE, I would not have put up with that for a minute. Either the circuit would get redesigned, or the vendor of defective parts get banned. But, I have always been a bit of a

My point was most switching supplies have optocouplers that send signals in both directions. Typically, one will send a feedback signal from the low voltage side to the high voltage side, to regulate

A properly functioning colloquially named zener diode will have a forward conducting knee of 0.5-0.7 volts, and a reverse conducting knee at the published zener voltage. Any voltage below the

Chuck, He would change them 3 or 4 at a time. Now we see two or three over 5 or 6 units. The 6130C uses 22 (or so) and the OEM HP ones were unstable. HP got better, but at the time (1979) they broke