Hi Jerry, What you describe sounds like typical RIFA capacitor failure. Use your search on the forum and search "RIFA capacitor failure" or something in that vein. Do that on Google too. Between the t

Not to be contrarian with Mr. Vincent here about leaving in those Fetrons, but about those filaments being series, he's absolutely right - Per the schematic, "MAIN POWER SUPPLY" and "HEATER WIRING", l

#photo-notice

Hi Richard, I do a lot of what you are describing with audio frequency amplifiers, and I think you are wise to set up a fixture to handle this as part of your bench standard setup. We wouldn't want to

Besides those 519, I saw some 7000 series stuff, plus a 555 and other Tek plug ins. Most went for next to nothing. Well, maybe some Tek angel has saved them from ruin and harvesting, so it is possible

Hi Banjoman, A 7233 is basically half of a 6080. I see them in stock (NOS General Electric five star) here in the US at RF tubes, here: https://www.rfparts.com/tubes/7233-ge-low-mu-triode-tube-nos-nib

Hi David, I'm so very sorry to hear about your trouble. Believe it or not, I had a very similar experience with acquiring my 575. If it is any consolation, I paid EXTRA to have mine "professionally" b

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 have

Yes, HP bought Sanborn somewhere along the way. Doesn't surprise me that you can't find much. Sanborn was (according to HP folks) a pretty stodgy and not very well run company by the time HP got them.

You are probably the coincidental recipient of the dreaded RIFA capacitor failure. "RIFA" is a brand of capacitors found in the RF filter section of the power supply input. I'm not going to go into it

...and if it is any consolation, my 2445b just blew a few months ago. It was the RIFA caps in the RF filter section. Was working fine. Turned it on. Smoke and stink and pfffffFFFFt! done.

Well, just really reaching here, but you say the new rectifier set blew? If so did you check C1021 / C1022? I know the fuse is "supposed" to blow first. Assuming you checked and the fuse rating is cor

Hi Walter, Yes, I've had similar thoughts, especially around the 575. As some folks here know, I'm doing a fairly thorough restoration/update on a circa 1962 Tek 575. Phase 1: At this point my 575 is

Thanks Marcel! I appreciate the video and the BOM file. I have a 2445b that is working fine, but I dread the day that the SMPS ever goes dead, as I know so little about them. Now, having your video an

re: editable posts I'm with Jim on this one. Here's why The data and ideas we post here are quite long-lived. I routinely search out old threads, hoping for correct and trustworthy answers. I then qui

So for the past week I've been working my way through Stan's 194 page list of 575 Factory Mods, so kindly posted here; https://w140.com/tekwiki/images/7/77/Tektronix575ModSummaries.pdf I was making pr

Hi Magnus, Thanks for the encouragement. Yes, I should have been more clear. Cheap, poorly designed SMPS often ignore their responsibility not to pollute the electrical environment with radiated noise

So here's the update. All is well. Frustration is gone. :-) What I did 1. Put the correct capacitor at C V733. It is a .002, 600V silver mica. 2. Replaced the out of tolerance R737 with a precisely me

So, thanks to Stan’s document, I already - found a major mistake I’ve made in V733 - answered the mystery C239 trimmer question, and - confirmed that Tek was fretting about grid current instabilities

Hi Mark, Yes, I checked those resistors. The 2.5m string is good, but R737 is 11% out of spec @ 111.7k. I will replace it! Yes, just as you suggest I am also suspecting a bad germanium diode somewhere

Hi David, A THOUSAND thanks to you for this! Maybe I can finally get straight answers on the mysterious C239, as well as the mystery undocumented V733 circuit mod. Should keep me busy for weeks. 🙂 Loo