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I think Mark is talking about using a CRT restorer/rejuvenator. Peter's book doesn't discuss that/those, AFAIK. Probably you know about them... there is some discussion beginning in message #166456,

Thanks. See my response to Chuck. I need to add that I need to turn the device OFF once the oscillation collapses otherwise the 3Amp fuse or Q714 will burn up since Q714 keeps conducting. The current

Thanks Chuck for the reply. I have posted some pictures in an album called "Tektronix 606A". The exposed cloth-like material feels hard. The transformer does NOT get hot (at least the top). Freeze

Just thought of another thing - look for any signs of the unit being banged around. Core isolation can fail if the transformer is displaced mechanically, possibly shifting and making contact where it

On Thu, Feb 25, 2021 at 12:52 AM, Stephen wrote: Your reaction to Steve's latest post gives me an opportunity to make even clearer what I tried to convey: > > > > > Then why would you replace the

Well, this has certainly become quite a saga. It looks like all the most common causes of this sort of thing have been checked and exhausted, so I figure it's time to add my one-cent worth. First,

When you make clear that a certain thing like that is an issue, others may conclude that you need help on that specific point but they can't read your mind nor are they your boss. I'm sure many others

Why not eliminate the mains possibility altogether and run the scope off a 12 vdc inverter/battery combo to see if the problem is still there. There may well be other noise evident of course! DaveB,

Because everyone is always asking about that rail, that it’s very important (which it is). So why not change it... After all... I can’t really hurt, can’t it? Yes, it means no

On Wed, Feb 24, 2021 at 11:29 AM, Raymond Domp Frank wrote: Interleaved > > >> > >> Maybe I’ll just go ahead and replace the 55V cap. I didn’t want to do > that, because, as you all know, > >>

I use hp10020a - but they are a little difficult to come by :) Try any Z0 resistive divider probe, or make some yourself.

Hi Jon, There is no risk, they are listed as not working. You only risk to get your money back if the item does not show. Any other case, you are screwed. Simply as that. Thanks but "Ebay" Item

Hi Mike, Wondering why this is message #141 in this thread? Raymond

Hello, Earlier today, you said: "ALL the low voltage supplies test ok and have no ripple whatsoever. That, of course, applies to the 55V as well." Then why would you replace the cap(s) on the 55 v

In my 465B schematics, no X-cap nor Y-caps are shown. There might be an integrated mains filter block although that isn't shown either. Raymond

That's probably just some errant, wandering ions that haven't yet been captured by the getter or have broken loose covering the cathode. Anyone of you got Peter Keller's book about CRT's? Raymond

I advise against such harsh measures at this time. Why not go ahead and first try another simple-to-do thing that several contributors, including myself, have recommended many times, again during the

I think that in places that are subjected to the most stringent safety regulations, like kitchen and bathroom, the mains connections have been renewed and set up according to the modern system,

Go to x-y mode. Can you make the dot nice and small by adjusting the focus and astig? Does the dot continue to look good as you move it up and down, and left and right? Sent from my iThing, so please

First time poster here. I’ve been reading many posts and learned a lot from you guys. I got a 465B from eBay and I’m having a problem with getting the trace to focus properly. Even after checking