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Remove the aluminum cover sideplate, mounted with two nuts accepting Allen screws (Astig and Trace Rotation) and the variable time/div knob. Underneath, you'll find the nut holding the pot. It's

Hello, John, Thank you. I uploaded just now two photos...the front panel and the rear panel. I can’t say that I see a pot mounting nut on my old 453 unit. Where should I look? Richard

Richard, In the exploded mechanical drawing of the 453A manual there is a sub-panel behind the outer panel of the swing out section. The pot mounting nut is behind the outer panel. I assume the 453 is

I am looking to replace a 20K pot/switch in my 453. It’s the variable on/off control for time/division, channel B, located on the side of the scope in a recessed panel. The panel swings out easily

Any ideas what could be causing all that ripple on the -5 line?

I did try to buy this item but after a signed contract and payment mostly silence. Has anyone else paid for this item ? If so then this is a scam. Please drop me a private message to confirm. If not

Oh, the trigger pulse is a flat topped rectangular wave, looks clean both without and with the display section attached.

Hi and thanks to all, especially Harvey. I am not much further forward. I haven't gone for replacing the caps as advised by Harvey, but have managed instead to probe the power supply into the scope,

FOLKS Athens TWDs are both spoken for and shipped. thanks for all the interest. I ultimately had FAR more requests than I had scopes to give away. Charlie C

I have had a problem with a couple of 475's and 475A's caused by Q904 in the A sweep circuit. This part is specified as a 151-0190-01. The base -0190 is a 2N3904, but the -01 version is a Teledyne

Thanks for the info :-) It's a low priority "nice to have" for me too. Regards, Dave

I mostly agree: I think that the same front cover fits all 2200 models, except the 224X and 2252 models. Raymond

I just found that have among my notes that the front cover PN 200-2520-00 fits All 22xx models. Was trying to verify this by looking up this number in the 2213A SM, but could not find where they list

Here in my area, we have a shipping store call Go'ng Postal. I have them boxed in bubble wrap, 3" on all sides. Then that box is inside another box with 3" of foam or bubble wrap on all sides. He

Adam, For those ini Southern California, there's a pack-and-ship company called BoxBrothers that has a number of branches in California. My experience is with the branches near Los Angeles. They have

Adam, None of 'pack and ship' places I've dealt with know how to deal with heavy delicate stuff. To them heavy generally seems to mean sturdy. In addition to the other sources folks have mentioned,

Tony, your point is well taken and apologies for over-analyzing. It is mostly about learning and trying to understand on my part and a certain amount of confusion. However, I think I have now

John, I had a quick look at the DIL packaged 50MHz oscillators available from RS Online and they are all marked TTL/CMOS compatible, from where did you get yours? Please don't be insulted - you

I'm not so sure they are. DC leakage current is well below 100uA at 20V. I'll check them again at 40. When I say the cans are domed, they may have been made that way as these are sealed at the bottom

According to the 2225 manual, the Tektronix part number for the front cover is 200-3397-00. Other 2xxx scopes that share the same front cover include: 2201 2205 2211 2212 2216 There may be others, but