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Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the TekScopes group. File : /TEK 465B woes/IMG_3837.JPG Uploaded by :

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the TekScopes group. File : /TEK 465B woes/IMG_3868.JPG Uploaded by :

At Sphere Research, we are still digging through all the various lots of repair parts we bought, and I found two interesting things that may help somebody trying to do a repair: Tek Fan Impellers

Hi Jim. On on Mouser now. Radio Shack didn't have anything close to what I needed. I'm guessing the power at .4 w isn't critical so I am looking for .5 w (500 mw) zeners now. I plan to purchase a

Thank you very much for your support! -> Alignment tool is ordered But: You scared me a bit - Hopefully, I didn't demaged the core already ... Maybe I find another CRT driver board on eBay so I have

Hi Kevin, be sure to get a real zener in before long, i have no idea how long the “transistor fix will last”, I’ve used it a few times when i had no zener. but it does have to be reversed

Hi Simon, Absolutely you want a plastic tool. Use of a metal hex tool will crack the core. Something like

From my experience with radios, TS-520, etc, please don't proceed till you have the right tool. ? Likely one of the other members here can give you an exact size/part number, but you are looking for

Hi Tom. Of cause - no I don't have the correct tool. It seemed to me like a hexagonal insert. I have some hex screwdrivers, but since the 16kV are not far away, I would like to use a non-conductive

Hi, I'm just getting started on a 7704A that has a few problems. There will probably be a few more questions to follow but first off I need to know if I can safely power it up with the top half

Sometimes when the core seems to be stuck, it is cracked. Do you have the correct tuning tool? Tom

Hi group. I would like to adjust the screen setting of the CRT according to the service manual. To adjust the screen image size, the manual states to adjust using L321 on the CRT driver board to do

A big "Thank You" to Jim Popwell for helping this person get his 465B running... AND for the excellent tip about using an NPN transistor's EB junction as a zener! The first 2N2222 transistor I tried

No time to look up schematic. 2n3904 is NPN. Base to emiiter is a diode in forward direction. To act like a zener, it needs to be in the circuit reverse biased so current flows into E, out of

Guys, Pls trim your replies, some of you have a very long tail, which makes threads very hard to follow. Tnx. ?HankC, Boston WA1HOS [Non-text portions of this message have been removed]

Thanks everyone for the support on this problem. I have one final question. When I placed the 2n3904 transistor as Jim suggested with the base at the cathode end, the circuit did not work. When I

Assuming you installed it correctly i.e. entered the correct parameters in the setup software and you start the program with the created bat-file it should work. I run these adjustment softwares in a

Congrats Kevin, Well done. Looking forward to pics of the Frankenstein repair. Next thing you know you'll be scouting eBay for scopes listed "for parts or repair", just for the thrill of repairing

Looks nice and bright -- suggesting 2 LEDs and 4 usec strobe width...

ROFL! All that hard work, and the bench still shows... Mark