Hi Mark, I would start by recapping the PS, the intermittend not starting makes me feel it's in there. The SMD caps on the A5 board would cause all sorts of funtions on the frontpanel not working as

I have a tek 2465B (serial# B077725, so could have the infamous SMD cap issues) that sometimes does not start. Typically, this is in the morning, and after I hit the switch 2-3 times, it starts.

It is a pretty well known phenomenon... well discussed on this group over the years... often by me. Around about the time the 547/545B scopes got designed, tektronix decided to make a universal HV

Chuck, Please tell me more about the 564B HV transformer epoxy disease! Thanks! Pete On Sunday, January 3, 2021, 8:07:20 a.m. EST, Chuck Harris <cfharris@...> wrote: It is a cute little

If I remember the threads properly, the thermal compensation (dancing readouts) fixed a small wobbling problem.  This sounded like a much larger deviation, and the picture I was thinking of was, say,

and I must be thinking of another 7K frame as I couldn't find it in the manual I have. It's also been called thermal compensation, or it may not be there on this model. But the symptom was dancing

No problem, Attilio! :) As to tuning the filter, it's very important to take a good picture (or several) showing clearly the initial state of all of the adjustments before you started adjusting them.

There is a low frequency compensation adjustment on the vertical output amplifier. If your power supplies are ok, check that next. -ls-

Thanks Tom, sorry, but I'm a little old and sometimes I miss something. I have read the cavity filter tuning procedure, the note that warns me that if you lose the signal it becomes almost impossible

Thanks Harvey, I have not yet tested the voltages and their ripple on the power supply, I thought it was a fault on the Readout board, but I replaced it and the defect remained. Tomorrow I'll check

Have you checked power supply voltages and ripple with the two sets of plugins inserted?  Wandering across the screen suggests both X and Y problems, and changing with load suggests power supply. 

Hi Attilio, I encourage you to read the article I linked you to earlier. You do have to retune the filter only a few percent. You cannot skip that step—the filter has a very steep rolloff so a few

Greetings to all, I brought home a 7613 mainframe to insert the 7L13 (SA) plug-in, but it has a problem in readout. It currently has a 7A16A vertical plug-in and a 7B70 plug-in timebase

Thanks Tom, you still give me hope to find the 52.5 MHz crystal third overtone. Just one question: if I understand correctly I don't have to touch the calibration of the four cavity filter, is that

I have 10 or more Tek analyzer probes, wires, and clips that I have no use for. These are 92a96 probes with breakout cables and clips. Time to clean up my shop.   Free for the postage. Send a

Don't expect them to plug in, they're not keyed right. Vince. -- K8ZW http://www.metalworkingfun.com http://www.hamradio.fun

Photos in album 7L5 encoder knobs

Hi Reg, By checking out the error codes in the "Tektronix 11801, 11802, and SM11 Diagnostics" document (on TekWiki, 11801 scope page), it shows from page 431 onward that the Time Base error index

From a side by side examination, it would appear that Vince is quite correct. Jack

Vince, that would be helpful. I don't have a Tek 5000 scope; can anyone independently confirm this? Larry -- Best wishes, Larry McDavid W6FUB Anaheim, California (SE of Los Angeles, near