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Clark, Thanks for the offer! I will get back to you on that after I exhaust other possibilities. Barry

If I am reading this correctly its just a matter of replacing the 2 130s with 2 FET. Does anyone know if a modern replacement for the FETs will work in this application? If so what is the part

Thank you sir!

I will 2nd Randy's question regarding having issues of soldering on Ceramic Terminal strips. If anyone has knowledge on the best way and/or equipment (does it need a very large soldering iron to

Some (most?) of the manuals for equipment that contains those strips have a section that shows the proper way to solder those. Barry - N4BUQ

That's a very common event.? Glad you got it fixed. Harvey

Randy, Just a side note. I don’t know if you are aware of a soldering issue involved with those terminal strips. The silver plating is very fragile and use of standard solder will leach the

Harvey, Thanks for your quick response! 4This morning I decided to remove the CRT. Just after it cleared the chassis I noticed that the Upper / lower deflector plates were not connected. At the

Barry, I have several of these transistors. They are essentially NOS in an open box. That is how Tek kept them in the engineering stock room. I do not have a convenient way to test them. I can send

Seem like the mold theory on certain plastics is a good idea. I also see it on some plastic sleve insulation that Tek put over connection points and test points. All the caps effected has a plastic

Download the Mod Summary pdf from TekWiki and check page 53 (of 85). /H?kan

Half of the vertical amplifier is effectively dead.? The causes could be anything from a broken wire to a dead transistor. 1. examine the wires to the CRT, they should both be connected (can

Thank for the suggestion Dave. Although the connectors have been pulled out, the cables are so “dried” and “hardend” that it is possible to figure out how they were once connected. Most of

Greetings, The schematic show these parts to be "FET N-Channel" 151-1005-00. However this SC502 was found with 130 ohm 1/4 watt resistors in those location. Those resistors were found to be burnt and

Greetings! I have been working on an SC502 that I suspect has been out of service for some time. I got all the power supplies working, about 10 faulty components. Then I found a bad trimmer pot that

Hello there, I just used some NOS Tek ceramic terminals to build up a project. These are the ones found in the 500 and 560 series scopes. I was surprised at how much heat was required to install

I forgot : - If the scan signal at the pin 7 of the character generators are "normal" in frequency and amplitude, the problem could be located in the way the output of the chars generators is

Hi Barry, I don't have a 7704 but the readout board seems very similar to the one I have in my 7603(s). From my understanding, the characters are drawn twice by the chars generators during one period

I was going to suggest noting the orientation of all the harmonica connectors, because there are a few cases across the entire product line where the connector isn't installed correctly (or the

I used 2 rows of 0.150 inch pins (not 0.156) from digikey or mouser on each side of a pcb. Works well. See /g/TekScopes/album?id=293351 for some pictures and the pin layout which I