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Thanks for your continued help Albert. I _might_ be able to cobble together a power supply in excess of 100V... but I am not understanding what that will tell me, possibly because I am unsure of your

Hi Jeff- I have good news and will follow up later......I have mine running using TO-3 2n5881's only had little bits of time with all the other stuff going on.....I will post stuff and a run down when

Edit, the first sentence should read:I have updated the list to correct two errors in the last version, to accommodate Digikey change of part numbers, and to replace some Panasonic capacitors with

I am not a chemist.? Nor am I up to date on capacitor chemistry.? Its been 19 years since I reviewed electronic designs professionally.? Still, I am qualified to read and evaluate manufacturers

replacing the ceramic caps seems to have fixe it - the orange ones that your very nice picture C940, 945, 946, and 952, 966 - I used .01 3KV ceramics - two in parallel, except for C945/946 which are

I have updated the list to correct two errors in the last version, to accommodate Digikey change of part numbers, and to replace some Panasonic capacitors with equivalent or better Panasonic.? It is

Hi Keith, I'm sorry I couldn't quickly guide you to the fault location. Personally I can spend many many hours in finding a fault, and that as far as possible without desoldering components. But I

The HV circuit takes less than 500mA when healthy: current is inversely proportional to the DC voltage in (unregulated, but normally around 16 to 17V raw DC). I wouldn't recommend removing the diode

If I decide to go that route, are there any Im on the lookout for a parts scope for my 465. Let me know the price,if thats the way you decide to go.

Thanks for correcting me Albert, I apologize for being so sloppy... I have corrected the legend on that photo to read 10V/div after I rechecked. And you are correct as well about my not having checked

I am not associated with RAMs but volunteer next door at the vintageTEK museum. RAMS main purpose is recycling. They run the store as part of that purpose but they likely do not have the resources to

Thank you ! My work is done. After replacing all 150 ohm resistors (1% 2W), the beams appeared and are normally adjusted to the full height of the screen .. After that, the capacitor was completely

I just took some measurements of the broken part : - Overall length : 8.6mm - Outside/largest diameter of the tapered/conical part : 6mm - Height of the tapered section : 5mm - length of the threaded

OK, I found the picture. I think you are right but not sure of exactly where to look at the moment. You have full sweep yet it does this, somehow that ripple is getting to a lower level stage. I could

Keith, I think the Q1418 collector waveform is taken at 10 V/div, not 20 V/div. The 15 V(unreg) comes from the bridge rectifier I suppose, where the schematic says ~~ 24.5 V. You didn't show or

If a transistor has been degraded due to reverse Vbe, you can actually restore it's Hfe by applying high base current to heat up the junction sufficiently. Might be fun to try. On Friday, June 15,

Hey Renee, I was just reading on sci.electronics.design about transistors degrading over time when they get alot of reverse Vbe. Actually they were talking about exceeding the rating or the transistor

Hi Tom, Thanks for the kind words, I am glad you like my repair topic on EEVBlog... not everyone can stand my long winded posts.. seems Sir "oldway" certainly did not, as you might have read over

Hi Bruce, I think what you really are asking is what I ask every time I am going down to Beaverton: "why can't the Country Store be open when it is convenient for me because I happen to be in the

Yup, about 49 years that I recall, when it was at Sunset. It sure gives you time to stew over the ones that got away. Bob.