The only use of the -50V supply on the vertical amplifier board that I can find is via the 2.87k resistors R409, R413 so any semiconductor failure beyond that is unlikely to load the -50V line beynd

Further to this...... Messing around pressing odd buttons to see it was anything I'd pressed and not noticed. I pressed the SETUP STEP/AUTO button and the ghosting is gone. So that seems to have

Hello, Up until this morning my 2445B has performed without a hitch. This morning I turned it on and noticed that the readout display is interfering with the main trace. It appears that

Before you do anything else read the very detailed Circuit Description (sometimes called the Theory of Operation) in section 4 of the 7603 Service / Instruction Manual. Tek is famous for their

Voltage selector Is set for 120V and the regulation is set high. The readings are with all boards plugged in. With the vertical Amp out the -50V supply is -50V and can be adjusted for -50.000V. The

Dear Raymond, Thank you for this excellent and directly helpful information! Best regards, Mike

Hi Eric, I would suggest a simple test: connect the scope to a variac (an invaluable device in an electronic lab) and observe the reading of the various supplies when changing the input AC, to get

I guess what I’m getting at is, is it urgent I do a recap and get the power supplies stable and at proper voltage and everything BEFORE I start hooking up my curve tracer and having not recapped it

google "tds 1000, 2000, 3000 bw hack" Raymond

first you need a way to communicate with the device (GPIB or LAN interface) and the firmware must be before some version (i dont remember right now, maybe it was before 3.31 or 3.16 or

What hardware and software changes are involved to upgrade a TDS3034 to a TDS3054 500 MHz 5 GSa/s oscilloscope? I'm interested in learning how to do this work properly and would appreciate members

Thank you for your reply Chuck, I’m a vintage hifi tech and I don’t really work on instruments in this magnitude simply because it’s not my forte. However I mostly use either nichicon upw series

Craig, Yes, there is a lot of garbage on Ebay. This is 100% of my experience. Two months ago I bought there a 1A1 plug-in for my restored 547, and this unit had been abused: the Ch.1 BNC input

WOW! If this "transformation" is what can be done with Tektronix oscilloscopes, then one should never buy one second-hand. Or one can do what I did back then in 1971... build your own. Ernesto

Ross, Well you will find a lot of great scopes and a lot of garbage on Ebay. This seems to be a market place for equipment of all sorts. I personally have 2465B units and accessories available for

Hi Chuck Noob question here. After doing many recappings on LCD monitors and other simple inverters, I have finally got an ESR meter. But I've never actually known what values to look for. How can

Hi Eric, I have limited experience fixing these Tek scopes, but this is what I would do .... assuming that it is the 7603 Linear supply and that your comment "When I disconnect power from the

Hey Rich, congrats on getting the old girl going, glad to help in a small way. Even though these scopes are pretty old and limited, you'll find they're full of tricks compared to your analog

Hi Steve, Understand that probe calibration is supposed to be done at 1KHz, as it is intended to calibrate the DC to AC transition of the probe. The 2445A's calibrator will change its frequency with

Well, I got my 2445A from a guy on eBay who said it had a slow startup which it did sort of I guess the first time I started one of these up? I have no idea if they’re instant on or I presume they