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I think you should probably review what was done with the EHT transformer replacement. My guess is its running unregulated and the output is way too high. That would cause reduced horizontal and

The bus,wire is,perhaps an indicator of a mod,perhaps b y previous repair attempt. Suggest you Remove the Trim pot see the,original PCB. Jon

GM all - Someone from the list has responded to my plea for assistance and I have a couple of the required connectors on the way. Cheers, Bill

GM Clark - Buying a 1101A would definitely be more practical but building stuff is fun. It is, after all, why i have all this gear in the first place. If I fail, the 1101A is the fallback option

Does anyone have a copy of the “REV B” manual? If so, does the HV board show a trimmer? Many thanks!

Anybody know how close the 2755 is to the earlier 492b ... 494a series design?

Hey there, Do you have a name we could call you by? The most common problem by far with the 24X5B scopes is a bad DAC reference due to electrolyte leakage from the SMD caps on the A5 board. The

The following photos have been updated in the SC504 Trace Problem ( /g/TekScopes/album?id=300558 ) photo album of the TekScopes@groups.io group. * IMG_2541.jpeg (

I'd like to build Dennis' design also. I do have one of his PCBs. His paper lists the Eico 665 and 667 as vacuum tube testers that have been tested to work. I found it odd that the 666 is *not* listed

Serials starting with a 1 are IIRC from the Guernsey plant

Here is a photo of the HV board showing the trimmer. /g/TekScopes/photo/300558/3883505?p=Created%2C%2C%2C20%2C2%2C0%2C0 Regards, Barry

Hi everyone. I recently got a 2465B scope and replaced all leaky/high ESR CAPs. The Dallas NVRAM was missing so I hacked in a FRAM and the machine did switch on; have to press A/B TRIG to proceed

This is quite an old thread, and I'm unable to find the original, which is even older. I'd love to buy one of Dennis's boards. Is anyone selling them? I've read his Oct. 2019, v1.04 paper on the tube

Jon, The trimmer has “250R” markings and measures 250 ohm. I have downloaded SC504 manuals from several sources. They are all the same version. I don’t know where else to look. Thank

Thanks Tom, I looked having got caught by that one in the past, the connections look good. To be certain of a good connection I pulled the lugs off then popped them back on. Andy.

If that first digit of the serial number is a 7, then it was assembled in Heerenveen. A six-number serial number without a letter and beginning with 7 indicates that it was assembled in Heerenveen,

I realize that it is more fun to build something from scraps and spares but have you considered finding an 1101 or 1101A lemo probe power supply?

Your serial number is odd. All Tektronix scopes serial are form X0nnnnn X-location of mfg, eg B Beaverton G Gurnsbery.... 0 first digit is always 0 Second digit is the age, 1- oldest 5 most 6

Reading further through service manual #1 section on 2ND LO tuning failure - there is an onboard calibration procedure (SHIFT 0 1 (calibration) 4 (2nd LO) - typo in the manual misses the 1 step). This

Wondering if anyonewho has a "spares" 465, 475, or 485 would be willing to pull a couple of the LEMO power jacks from the back (the four pin jackused to power Tek probes that use +/-15VDC) for me. I