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Does this look odd to anyone else? https://www.ebay.com/itm/375606603143 https://w140.com/tekwiki/wiki/T7510 Thanks, Barry - N4BUQ

Solid BeO is not dangerous. The only dangerous form is BeO powder (dust); as long as you don't grind BeO, you're safe. Ages ago, BeO microspheres were developed as a safe form of BeO for incorporation

Miguel, Sorry, it can't be fixed. Don't open it either, hybrids like this sometimes contain BeO, which may or may not be indicated on the cover.

Is there hv on the tube? Do you see the heater glowing? Measure the DC supplies with a scope, should be flat (-ish), no noticeable ripple.

Haven't seen these for a while now. I recall... even used...they were pricey... everyone "needed'' a TG. And you need an external counter... to 1.8 GHz... which isn't cheap either. AFAIK... nothing

Check the three transistors and IC associated with the 50V supply. One or more could be open/leaky/shorted. The series pass would be the first to check. Check to see if you have the 9V across VR1416

Dears, I got a 2715 with battery down. Do you have an idea where I can recover the elusive "271X Flatness Tests" software? Are you so kindly to send me it? Thank you very much in advance for any help

Hi everyone, I’m starting with oscilloscopes and electronics. I got a Tektronix 475 that I would like to repair for my lab. It turns on but unfortunately I have no trace...I tested the voltages.

Interested in a TR502 and cable to pair with my functional 7L13 Also would like original manuals for both Marty KL7AM

Thanks, Tom. This scope has had a bad case of that curse. One tantalum went up in flames and two more smoked pretty significantly. This one just shorted with no glorious demise. There are still

Well done, Barry. The Scourge of the Cursed Tant continues to haunt us. -- Cheers Tom -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 420 Via Palou Mall Stanford University Stanford, CA

Bad tantalum, C3396, on the OUTPUT SIGNALS board. Replaced C3395 and C3396 and all is working again. Thanks, Barry - N4BUQ

Hi, I just picked up an OT502 E/O Converter TM500 Module in a mainframe of assorted modules, and am looking for a user/service manual for it. There doesn't seem to be much online.. If anyone has a

Thanks, Jean-Paul, Mark, and Tom, The relaxation oscillator I was referring to is the one that makes the neon flash which is comprised of R3019-C3019-DS3019. I was originally writing the above email

Barry, A few things that could cause the fast ticking are: one/both transistors from the 0067 IC to the driver transformer bad, the 9V zener to the 0067 open, the two 1mfd filters from the small

When there is an overload, the PS shuts down and tries again a bit later. Each tick is the sound made by the magnetics as current starts to flow then shuts off. No master oscillator drives the tick

Shorted tant J

I powered up one of my 7704As which worked fine the last time I used it several months ago. This time it worked for about 30 seconds and stopped with the power supply going into a rapid tick mode

I ground a slight taper on the top of the posts with a tapered Dremel grinding wheel. I vacuumed the cavity and then blew it out at low pressure with an air hose. I remember the HVPS it came out

There are dozens of Dremel tool accessories, and other manufacturers have made accessories which can be used with a Dremel tool. I own 25 grinding accessories for my Dremel tool, mostly aluminum oxide