The HV transformers in those scopes gather moisture and can be brought back to health by warming firca day or so with a lamp. Bandwidth may seem pitifully lame by modern standards but I used one for y

Unearthed here: 120-0199-00 Small transformer 2x2-1/2x2, potted Two insulated leads Seven hookup wire colored leads. Tek blue painted. Any data? Roy sends.

The TMC GPT-750 transmitter has an output monitor connection fed by a capacitive voltage divider. It is just two capacitors, a few pF from main rf output to the monitor connector and maybe .005 uF to

Just price them from on-line tube sellers. The audio folks pay insane prices for them. Reason? Scott and other tube amps of the 50’s and 60’s must have that particular tube type because of the combina

Hi, If your 561 HV transformer is acting badly, try heating it with a lamp reflector for a day or so to get the moisture out of it. A college instructor whose lab has a number of 561’s did this each s

Roy sends. In filmmaking, the “gaffer” is the head electrician and/or lighting designer. I somewhat reluctantly add: If it should move and doesn’t, use WD-40 If it moves and shouldn’t, use duct tape

I no longer have my 585 or a manual, but I am pretty sure that all the other B+ voltages depend on the -150 supply. I suggest you focus on that one - you may find that all the others come to correct v

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. Ro

Bruce, Thanks for posting this information. I’ll include it in my copy of the book. I just did a bookseller search (amazon and ABE Books) and find only two or three copies available, one at $12.50 and

Kevin, I am *assuming* that a digest collects posts over a moderate time period and those messages mage up that digest. So if your post and any replies happen on that time interval, they show up on th

Dave and others, I was lucky to get a copy of "Typical Oscilloscope Circuits”, and have read about half of it. I wonder what scope the schematic examples are taken from. They certainly look genuine. D

How is it different from the 1A1?? Roy sends.

If anyone wants to have cables made for them, or buy wire or connectors, consider RF Connection: Rfconnection.com No “s”. Long in the business of making cables for military, government, and industry.

John and others, I have a 547 and a 545B that I plan to run for a long time. One of the two late 1A1 plugins I have has low gain in one chancel. Not diagnosed yet. Have had other scopes of that era an

The copy I got via Amazon came two days ago. I’m a happy camper! The revised version I got was published in 1966, the same year I got my BS EE, having used these scopes in labs. I now have a 547 and 5

Dick, If it is for sale , I would be glad to hear the asking price Thanks. Roy sends.

Kim, I am not familiar with the thing, but from what I see on the tek wiki pictures, it seems have a horizontal sweep external input. This would let you use it as a sort of spectrum analyzer with a se

OOPS, Caig’s renaming caught me and I stand corrected: Here is the right terminology from their website: Moving Contact Lubricant for Conductive Plastic Faders and Controls DeoxIT® Fader F-Series is a

He means Caig Fader-Lube: https://caig.com/fader-f-series/ De-Oxit is for metal switch and connector contacts. Fader-Lube is for sliding deposited carbon controls. Their applications guide can be had

Inspired by watch repair methods: A couple pieces of hacksaw blade, de-toothed and shaped on a grinding wheel, then bent into short armed L shape, could make a fine pair of levers to get the knobs fre