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Thanks for the help Bruce. Pins 2 and 3 of the op amp are about 3 volts apart. The pass transistor appears to have a short between collector and emitter. I’m going to order a replacement. Should I

Does anyone know the official part number for the cover used on the Tektronix 492/496 Spectrum Analyser? Gary

Steve, Excellent Information. As you can probably tell, I am quite the novice, especially when it comes to SMPS operation. My limited knowledge of SMPS told me that they must be "loaded" in order

Ravi, Certainly. I will post in the PHOTOS Section shortly. I have Tried to get some good photos for your reference. Feel free to contact me off list with any questions. Sincerely, -- Michael

Hi, Reg.I am so envious of the 11000 series toys, er I mean tools, you have!? For now, I will have to be content with my 7000 series sampling gear including two S-4 heads.? Not that easy to even get

very interesting information. Thanks. The 11801 series has what has to be the worst FW anyone has ever written for a scope as you will shortly experience first hand. But they really are *fantastic*

Start by checking the voltages at U930 pins 2 and 3. These should be about +6.9V and equal. Then work towards the series pass transistor. Note voltages on a printout of the circuit schematic for the

Hello. I recently acquired an SC502 for my TM503. It’s working, but in the course of running through the checks in the manual I found that the -20v supply is at -28v, and turning the -20v

AAAAAAAAAAAAAAccccccck!

The beam current definitely changes each time between turning intensity down and up again, as the case describes. Although I can understand a jittery/jumping Q4432 role, is there a reason *not* to

Dave, One small caveat regarding the addition of the DP501 if you ever consider picking one up. Making it work properly with the DC509 requires addition of interconnections between the DP501 and

Power supply design is a series of tradeoffs.? It may be that size and cost (for a heatsink, let alone other things) suggested using a common design with a tapped transformer. About the worst case

Many Thanks to all who have replied, My wife is off work for the next 3days ,so I probably won't be able to get much more done until then??From the sound of it seems like it's worth fixing? ,I did

The GR 1232A Tuned Amplifier and Null Detector has an 874 connector at the input. It receives audio signals from diode mixer/detectors used in RF measurement systems that mostly had 874 connectors.

A couple of years ago I got a 465 and a 465B.? The 465 worked but had no fan.? The 465B had no CRT but a good fan so I moved the fan over and all has been well since. I really don't recall what I

Working on a 465B and noticed the fan doesn't rotate. With the rear cover removed, the blade seems to turn easily. I got the impeller off, but it looks like the A1 board needs to be removed to get at

That makes sense; the prescaler is barely mentioned in the manual- that's why I missed it. -Dave

Certainly some other vendors used GR874 125ohm connectors because their intended use was to preserve bandwidth into a 519. I remember a TRG manufactured planar photodiode with a 125 ohm connector

874 connectors were pretty much universally used on GR RF instruments manufactured after 1948. -- Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg,

Hi All: Apologies for taking so long to respond; but, I finally found my stash of GR connectors (and a couple 500/7000 plugins using them too)… so I could have a look at and 874... in "the flesh" so