Good Day Yeun-Jung, apart from the discussion on HV probing, my recommendation is to check the HV capacitors in the high volt section. I have seen a few which failed in other 5000 series

Hi Ernesto, Thanks for the discussion which I found really interesting. I am also a 547 admirer and use one as my main bench scope with a 1A4 plugin. That combination really brings out the best in

Hi, Thanks a lot for this information! Did you ever find out if 10000 .. 1FFFF actually is the the NVRAMs on the A5 board (U500 and U511)? Ragnar

Dave, Thank you for the tip. I read and see the photo album and this is a great information and a great job ! I believe also that HV transformer is the same on 453 and 454.  Actually I am trying some

"I had never cleaned it from some dirt accumulated in 40 years through the cover holes, many tubes are dirty, but I didn't dare to blow with compressed air or... god forbid ...wash it." After you

Albert, Thank you for all that great tips that you sent yesterday and now.I was busy today with the  interference filter dead. I couldn't find any spare on the market with the same size as the

Hi Albert, thank you for the information. I verified the action of the negative pulse by R562, C562 on power up of the -150V that shifts the trace to the right. I could do something similar when the

It is not only the enjoyment of the scope working, but also of the challenge of going around its HV problem. I had incorrectly written that the plug-in on my scope is the 1A1, but it turns out the

The manuals on the internet are the old 1963 versions of the P6015 manual. If you look at the picture, you should notice that the connector on the compensation box is an old PL259 UHF connector, like

Monty, I will add my complement, you did an awesome job on that design. I just made some of the little "Bottom" feet for the 4XX series, I had a 465 that was missing some of those as well. I find

Gulp!

(continued) I did an easier and less risky test. F1437 tied to GND, wire to "P" disconnected. Sine wave generator FG504, same GND , 50 ohm output applied to Q1430 collector (no other termination).

JR, I slice the STL file with CURA 4.4.1. Print in PETG, Nylon or ABS (I use PETG with great success). Print "laid down" on one side so that minimal support is needed. Hope this helps. --

Oh good. I was about to say I couldn't help with the 465 :-) Thanks others for the compliments. Cheers, Monty

Thanks Mike! :)

JR You need a file for the cordwrap feet of the 465 Series? That file is on THINGIVERSE. HERE: https://www.thingiverse.com/thing:1410827 I can e-mail you the STL File, as I have that as well. I

Roberto, If everything works before Q1446 fails then the simplest explanation is that Q1448 has failed with its collector open circuit and Q1446 is passing all the current to the +15V output through

Monty, Great Job in those Feet! Now if I just had a File for 465 Feet... JR

hi Roger Yes, the track is there that performs all its functions, but after a few minutes the CRT backlight turns off and the reason is missing the + 15v, the voltages are all up when 2n222 fails even

Ok, several things after searching the  manuals. 1) the liquid is fluorocarbon 114.  SF6 is used in the AWACS transmitter unless they rebuilt it. 2) the P6015 has the liquid, the P6015A has a