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Test the fan by itself and ru it for 30 minutes and see if it stays just worm. If it gets hot, you will need to replace it. Also, how freely it spins? Is it like new or slight resistance? Gooooooood

Yes. I had read all that I could find of Jim’s and Bob’s pubications at that point (I was a practicing engineer at the time and subscribed to the trade journals that published their columns). I

Okay, Chuck. I presumed it was a collet but wasn't sure how to release it. Unfortunately, I did turn the screw some in a CCW direction and then back again so it sounds like I may have damaged the

Chuck I appreciate these little insights that you and others provide to the lives and careers of these giants of analog circuits. One thing that I always enjoyed was looking at these two gentleman's

Indeed! They can be friendly in the winter. But a $19 milk shed heater, and a 2465 scope is quite a bit more cost effective, is fast enough to do most work, and heats better too! -Chuck Harris Michael

Hi Tom, I get what you are saying. I really do. I also know that there are very few things today that would warrant using such a power hungry, bench space hungry old scope in real engineering today.

He was driving when he died of a heart attack, no doubt brought on by grief. He rolled to a stop with no impact. In other words, he was in control of the car to the very end. It was a pretty rough

OMG!!! I surely hope you haven't followed any of these suggestions! It is easy, loosen the nut, do not let the screw turn, level the nut with the screw slot, tap it with a tiny hammer, and it will

A vacuum tube Tektronix scope was no problem in the winter, at a TV station in Alaska. It might even get the control room to 40F, if it and both transmitters were on! I would turn on the studio's

It is easy: Put a screwdriver in the slot of the screw, and use a wrench to turn the nut against the screw (DON't LET THE SCREW TURN!!!) Back off the nut until it is flush with the slot, and give the

I thought he died driving it slowly and rolled to a stop with no impact...

Absolutely, I agree! I really enjoy the aesthetics of the 545B, 547, and 585A. I keep a few around just so I can look at them. But I will not go out of my way to find work for them to do. I am way too

The 453 and 454 are both quite viable for use today, and usually not expensive. Some versions are all solid state (except for the CRT, of course!) and others have tube HV rectifiers and two Nuvistors

I am old enough to have studied vacuum tube physics and grew up during the 500-era. About a year ago the university decided to scrap the very large inventory of obsolete equipment left in a storage

I have one. It works perfectly - or at least it did after I replaced a defunct germanium transistor. Or did the last time I turned it on, which is quite a while ago. Although it is "only" 850MHz, at

Over the years I had occasional email exchanges with both Jim Williams and Bob Pease regarding various IC parameters and behaviors. I found that one seldom had a reason to challenge their thinking

He was a wonderful person, extremely knowledgeable and could make you gain insight into analogue circuits like no professor I ever encountered. Renée

If you can do it, perhaps gripping the fan motor shaft with a big pliers and wobbling the blade may help.? Wobble it back and forth numerous times but never with much force. I have a problem with the

I agree with all you crazy people.? I no longer have tube oscilloscopes but I have owned many.? I still have one left over plug-in. My tube gear includes signal generators and voltmeters and an old

The fan was working - at least I'm pretty sure it was. Something in the PS began to smell of smoke so I'm pulling it to perform needed repair and maintenance work (mostly capacitor replacements).