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I'd try taking the knobs off and spraying Faderlube down the shaft before disassembling it, and I'd also try that from the exterior and see if it'll wick through any gaps. For garbage and missing

Roger, You may have to, unsolder the leads from the diodes from the rear wafer, loosen the nuts on the rear of the switch enough to keep them on, loosen the nut for the pot, move the pot back enough

Thank you very much for having time to check and post this reply, Barry Roger

Hello and need help for this part. I’m looking for the vfd display used in the counter timer of the 2236. Part number is 670-7423-01 for the small board and 150-1110-00 for just the display tube.

dear all, I dropped my 7904 from its cart last week. Up to the moment the identified losses are: 1- broken 7B85 time/div pot and cal/uncal knob and rod 2- Very noisy redout pot 3- Garbage number

Looking at that pot from the back, on mine the center pot has the left tab grounded, the center tab has a wire with white insulation and a violet stripe, and the right tab has a wire with red

Hi to everybody. I bought a 067-0587-01 on Epay and, for the moment, I have two issues: 1- One red wire going to the amplitude Pot is "floating" as shown in photo

Rogerio O <rodd414@...> added the photo album 067-0587-01 ( /g/TekScopes/album?id=302607 ) : one wire connection is broken

Looking again: the offending relay was K490, which is the bandpass limiting relay; I misread the numbers on the board since I wasn't using a flashlight. From the description and schematic, K480

I had opened an older version of the schematic which doesn't have that relay. I see it now on the later versions. Apologies for the interruption. Barry - N4BUQ

I'm looking at the manual on Tekwiki for B200000 up, and K480 is at the very back center of the output amplifier board on the labeled component photo. I need to find it on the schematic and see if

Hi, my 2784 Spec lost all the data, because Li- Battery has not been changed last fifteen years. Now, when I power the Spectrum Analyzer the display shows me a 2782 . How can I fix this problem? I can

Hi Adam, Was that, perhaps, K48 or K490? I don't see a K480 but I might be looking at a different version of the manual. Glad you found/fixed it. Those relays are definitely a pain. Barry - N4BUQ

Well, after replacing C187 and C163 with no improvement, it turns out that I overlooked relay K480. Swapping with my known good relay immediately got rid of the giant hump at the front of the pulse,

P.s. test tne above with rbw well over 200kHz. That cuts out the inner yig loop which is 2/3 of the first if hw, making debugging easier.

no if 1st if osc...I would do in this order the following..Check... Power supplies, good, not close but right on the money. See john miles notes. Check there is any yig output , i.e.1st IF is on front

(Un)fortunately enough, the frequency control section is one area that I've seldom/never had to work on, myself. Since you (Federico) have extender boards, I think I'd try applying a combination of

Probably 0.4inch. "Common Design Parts Catalog MECHANICAL Catalog 2" helps a lot. Even the dimensions of the knob flutes are accurately described.

While it may not matter for this application, the inductance of film resistors may be different depending on type, value and trimming method both from one resistor to another as well as to carbon

Carbon composition resistors have their place where where short duration, high energy pulses are involved. Film resistors just open up. Carbon composition resistors increase in value with age,