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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 installed.

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 Disneyland)

The balast resistor value must cancel the negative resistance of the tube discharge plus 10 to 20 percent to make the system stable, the combined tube negative and resistor positive resistanc must be

Emerson-Cumming used to sell a very good epoxy dissolving liquid. Wear super strong gloves and an N95 mask on your face, or the liquid will dissolve the skin on your fingers and wreak havoc on your

A frame and front panel from a 5000 series scope plugin is the same as the TM500[0] plugins. Sometimes they can be found for under $20 on ebay. Vince. -- K8ZW http://www.metalworkingfun.com

The balast resistor should be located as close to the tube anode as possible (minimum stray capacitance to the tube anode). Leon Robinson ?K5JLR

Bonjour a tous, Working on my 7L5, has just one bad shaft encoder knob, the FREQ span/div Usual flaky positions 1/2/5 kHz are acting like 100/200/500 kHz. Just using contact cleaner does not fix the