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Thanks Keith for the info, had seen those autotransformers on ebay as well, will check them out.

311-1702-00 is the one I am actually looking for. R1070 on the Timing Board. It is the pot controlled by the red VAR knob in the middle of the A and B TIME/DIV and Delay Time control knobs. I will

Hi Charlie, re: rear fan filter frame. Here's one that might work. https://www.ebay.com/itm/325114892914?hash=item4bb25b9272:g:z28AAOSwQj1iOzQy This is from MercedesMan aka "Tubehunter". He will

Looking for 3 parts for my Tek 575: 1) The Collector Supply Auto Transformer. The 576 used the same one up to s/n 326319. Its a Powerstat 10B-1218, but it looks like any Powerstat 10B would work. 2)

Mark....2/ unsure of ULD. Beware ESR of a tant may be much lower than an equivalent size or capacity electrolytic. 5/ the backplane of 7904 had some axial caps and at least one had failed, but

I've just replaced the TekWiki PDF ([https://w140.com/tekwiki/images/4/41/070-0970-01.pdf](https://w140.com/tekwiki/images/4/41/070-0970-01.pdf)) with a 600dpi grayscale scan from an original chart so

The ROM inputs may float high. Try grounding a ROM input with P306 disconnected. -- Bob Haas

I thought you were referring to the Trigger Hold-off control, but that's a 311--1401. Which control do you mean? In any case, the vintageTEK Museum can probably supply the exact replacement part.

Yes, I understood that, thanks... but the 240 volt, 20 amp outlet (protected by a standard SquareD "QO" breaker) can handle the AC inrush adequately, especially since I have an NTC inrush limiter on

Just for kicks, I looked through one my "trophy case of failures" (cookie tins), and it looks like all the failed Ta caps I've found are the dipped type with color stripes as the only marking.? I

Interesting suggestion, thanks! I could use a triac with a slow ramp-up of duty cycle, like turning up a light dimmer? Seems like it would not lower the peak inrush current at the diode though, just

You might consider a zero-voltage-switching triac module on the transformer AC input, for somewhat more consistent and gentle turn-on events...

Jon, I will replace the 1mfd and less tantalums because these are typically high in ESR by now. The three 4,7mfd tantalums in the 2400 series power supplies Mr. Y. from Condor Audio says will be open

I will add in the file section some pics how to modify the DS1742 to add an external Li cell. Lutz, DH7LK

Bonjour, We have boxes of these, since 1970s. And worked to fix many TEK TM500 and 7000 and 2465 scopes with failed tants. 1/ The metal can axial hermetic tants of epoch 1960s..1990s ...very

The following files and folders have been uploaded to the Files area of the [email protected] group. * /TDS3032 NVRAM.pdf ( /g/TekScopes/files/TDS3032%20NVRAM.pdf ) *By:* DH7LK

Now all is successfully re-assembled and essentially operational.... but that does not mean correctly!! All PSU voltages are set correctly (a low +55V due to a faulty U712 had been upsetting all the

I am restoring a Tek 475 that took an impact to the front of the scope. It broke some knobs and I know at least one of the pots is damaged. Part Number 311-1701-00, 20k with a switch that is dpdt. I

I've been going through the calibration procedure in the manual, and there is a note at step #10, 65 - 500 MHz FREQUENCY ±2%, that reads "The dial is matched to the oscillator by individual marking

Found a data sheet online for the bridge: https://datasheetspdf.com/pdf-file/1391462/GoldElectric/MDQ200A1600V/1 Assuming those specs are accurate (not always the case with Chinese parts!), it looks