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Jim Ford suggested sine wave drive. I think, How about a shaft coupling made of elastic material with damping?? Oh, now that I read ahead I see you're already thinking about it. I am eager to hear

Hi Sean, A bit of drift shouldn't be a big problem if both resistors in a pair do it by the same amount — it's when one differs from the other that you'll get the trace shifting up or down. But

I don't want to gloat or anything, but I had my 547 transformer rewound by Bill almost 20 years ago IIRC. It's been flawless, I even put back the 5642 rectifier tubes so it works at load.

Jon, Static precautions need to be followed when handling. I’ve heard about cleaning the hybrid mating surfaces with the iso alcohol, but personally never done it to solve any issue. Why would you

Hi Jose, Because of your work, I found that in my 485 the Pos potmeters (all three) are dirty, that's why I opened mine. Tomorrow morning I will check the voltage on C1660 and report back to you

Yeah, Toby, I thought I recalled LeCroy as well but wasn't sure.? ? ?Jim Ford?Sent from my Verizon, Samsung Galaxy smartphone

Hi All, A document explaining how Tektronix wound their transformers (including the HV ones with the specific machine used) can be found here:

LeCroy definitely used amber. > > > >

Thanks everyone. I think Nick here found the winner. R670 and 672 have both drifted over 5 ohms on both vertical amps I have. I'll try replacing those two first. Sean

It might have been for TDR, or for RADAR ... as an alternative to tunnel diode based pulse generators. (Tunnel diode based pulse generators.. the patents show up circa 1950... whilst transistor based

Thanks Ozan, Will do and report back. I hope it’ll fix things and that the chip isn’t bad. That would suck...

Hi guys, Just putting the word out. I’m looking for a 465B tigger pot with switch, parts number: 311-1192-00 QService doesn’t have one at the moments. So if you have one for sale, hit me off

The Keller book (rev.1991, pg 17) indeed describes the exact technique as used in my scope, even the amber filter. I wonder what P7 does to the writing speed. At 50 Hz trigger and 100ns/div the trace

Dear Chuck: Great advise again! Will try with ISO Alcohol, and order the Deoxit liquid. By the way, Amazon has some 99% isopropyl alcohol in gallons or as smaller bottles, ~ 25-30$/gallon.

Jose, I am not that familiar with the inside of a 485 as mine is purring along just fine. I am still interested in anything that relates to the 485, none the less. One thing that I know about the

This just sorta screams of a software bug or a register crash in the arduino. I gave up on those years ago, when F4 procs are under US

IPA should be fine, use cotton swab with a little gentle rubbing on the hybrid side, and wiping the contact springs towards their open ends, on the socket side. The red DeOxit, in the small squeeze

Hi Stephen, You are right. My schematic scan is so fuzzy I can't tell the last number but part list is much cleaner and it is actually VR749. VR749 is the suspected zener diode. Before removing it I

Voltage Range Switches. I have repaired both voltage switches some time ago.? I will send pictures to io groups by Friday as I have to search for them.? A metal washer, three stainless (could be any

Chuck WOW your are as always the authority on TEK! Perfect notes, I suspect U500 has a slightly flaky connection, as pressing the HS seems to affect the symptom. I have no Deoxit, just MS-230