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I finally bought a broken pre-B040000 PG-506 and have repaired and recalibrated it. It had one bad Signetics 7475 produced in the 10th week of 1979 which I replaced with an even older Fairchild

Gotcha. It is funny how these things work out. I guess we need to find someone with both 7B92A versions and an SG504 or equivalent to measure any difference in the triggering sensitivity. I thought

Congratz Keith. You for sure deserve a good scope if nothing else for your tenacity. I agree the community sure came together and helped you through this. Very impressive and I learned a lot as

Hi, I am parting out 2 7D01s and a DF2. Nothing less than $2 plus postage and handling cost. I am downsizing so trades are unlikely. Will combine for multiple parts. Make offer off list. Charity

Hi David, I got this "hybrid" 7B92A through a swap with my earlier tunnel diode based unit. I only received my SG504 (and SG503) after that so I don't know my earlier 7B92A's trigger behavior by

I have not responded until now. I do/have used toothpaste as well to finish (not gels but regular tooth paste) with good results. However, I have now started using the headlight de-oxide products from

Hi Dennis, My message was related to my earlier question on this forum (original post) about the reasons for and consequences of replacing the tunnel diodes in earlier 7B92A's with these hybrids. It

I just recently acquired and repaired an SG503 that was suffering from bad TI sockets. I do not have anything suitable to test triggering above its 250Mhz maximum frequency. Did your non-tunnel

Hi Raymond, WOW! I will have to try that myself and try it with a 7B10 which should be as good. Dennis Tillman PS: Do you know Ernest Lans in Delft? He has a big collection of Tek 7000 and a

Tried my newly acquired SG504 (with leveling head) and saw this 7B92A triggering happily at around 1.05 GHz on my 7904 + 7A19... Of course, amplitude isn't shown anywhere near correctly. 7B92A is

You might want to check out the cleaning/polishing stuff used for aircraft canopies. I have some left from my days in the airforce (it expired, so it was canned, works just fine still :-) Given the

If you can't get the scratches out, you may be able to find some blue transparency film at Staples. This is the stuff you would use with an overhead projector. It should stick to the CRT face just

Hi Keith, Time to update the title of this thread? Nice success, but how do "you" manage to have a 'scope with so many problems! :=) Wavy readout is common. How pronounced depends on sweep

Wow. Good deal. I suspect I learned as much from you fixing your oscilloscope as you did or at least enough to continue work on my functioning 7834. <keitho@...> wrote: This should be

Hi This is my first post. I wish to thank every members for sharing their experiences. Recently i bought a very nice 321A , evolution of 321, the first battery operated Tek scope. Mister June 1971 on

Don't know if anyone mentioned tooth paste...an excellent incredibly fine abrasive.takes a lot pf patience but the results are often spectacular. I use it all the time on my lightly scratched eye

Thanks to you all for your advice, both here and off-line. I'm looking into these remedies as well as fabricating a new replacement filter. - Ken

Are you sure you don't have a lose or mis-plugged cable or connector? After all that you have been through, that would be the first thing to check. Good job though. Grats! Tom

I have no affiliation with the seller. http://chicago.craigslist.org/nwc/ele/3140620720.html -Kurt

Good News! We now have a working CRT and R7903! The Short story: After replacing one resistor the screen came alive. After some adjustments there are two items remaining with this project that I need