Last summer I purchased a 38 year-old sailboat with a depth sounder that was only partially working. It looked like the unit basically worked, but the LCD display was completely dead, so you didn’t kn

I have used an HP 3400A to measure the noise in circuits for several applications since the 1970s, both for business and pleasure. I found it useful for determining the equivalent input noise for vari

Here is my attempt to explain in a real-world example the concepts of negative feedback and whether or not it lowers noise. The is for my buddy Keith. I came up with a simple real-world example of neg

Bruce, I had a similar experience in the mid 70's as a young design engineer. I had a multi-input ADC which was implemented with a single ADC, a S/H and a couple of multiplexers. The problem I had wit

Jon, I have no experience with this, but it might work for some. Stewart MacDonald Guitar Shop Supply sells a special cap with a side hole designed to screw (3/8 x 32-thread) onto the shaft of a pot o

I purchased a Tek 575 Mod 122C curve tracer a couple of years ago from a Craig’s List seller. There was an original Instructional manual included along with instructions for a Mod kit (040-0223-00) wh

Reg, I would like to take you up on your generous offer. I could not figure out your e-mail address so I couldn't PM you. Thanks! Matt

I found myself looking at books from Alfred Morgan (The Boy's Second Book of Radio and Electronics for example) that I nearly wore out the public library's copy back 50+ years ago. This has brought ba

I have an old 575 like the one your brother has. I think I might do a little exploration into the circuitry to see how one might drive a pair of A/D converters to get the horiz & vert data.

I assume that the 576 Curve Tracer doesn't have a USB interface and this guy has somehow added one? Any idea how/where he tapped off of the 576 to digitize the data on the CRT?

Reed, Thanks for the input. Matt

Rolynn, I have removed the side panels and cleaned out some of the dust. In regard to the possible location of a couple of added fuses, in front of the fan, I have a couple of selenium rectifier stack

Reed, The serial number of the unit I have is 004583, so I am assuming the fuses are not there (I haven't taken off the bottom cover yet). Assuming that I should add these fuses (F240 and F241), what

I finally picked up the 575 Curve tracer from my nephew. Before I plug it in and turn it on and look for smoke, is there anything I should do? I don't have a variac. I haven't restored and old piece o

I live in Vermont, 5 hours away, but have a nephew close to Syracuse. He picked it up for me last night. I couldn’t resist the bargain. Matt Sent: Friday, December 15, 2017 4:28 PM To: TekScopes@yahoo

I found the table for power supply voltage tolerance in the manual and the pins on J119, the test connector, on the main board. What it doesn't show is where the ground reference is that I should be m

Hello all; I am new here and I have a 2465B that has suddenly given me problems. After about a 5 minute warm-up, the image on the screen contracts to about 2/3 normal size and it jitters so that it is