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There is a kit on Ebay for $60. This web page listes the capacitors, but I would compare them to the manual: https://bradthx.blogspot.com/2014/01/tektronix-2445b-capacitor-replacement.html

K8FC, I think this is the kit you are looking for. He has offered this kit of caps for years: https://www.ebay.com/itm/252865418970? Attached are the details. Sam W3OHM Sam Reaves ARS W3OHM Owner /

I have two power supplies for the 2445b and they both need new caps.? I know a few years ago there were cap kits that included all the key caps to replace in the supply.? My particular issue is with

HI. Are there any other "odd" symptoms?? (Even seemingly unrelated.) What sort of waveform were you using?? Something with a slope (sine wave) or sharp transition (square or pulse)??? Does it

I noticed this a few weeks ago, that after about 10-15 minutes I see an occasional horizontal jitter that lasts just for about half to 1 second, and then does not happen again until about another 30

Background: I was chasing a sweep issue with generous help from people here when R908 caught fire, taking out CR908 and R909. Found Q908 bad. So...replaced all the above along with Q9070. U930 seemed

Thanks tto all the people who have helped with my PS problems. I've done some research and come up with some cross references to some of the arcane part numbers in the Tek parts list. Q908, 930 is a

============= As I wrote in an earlier message if 2N5551 is the replacement for Q908 it is the wrong type. You need a PNP and 2N5551 is an NPN. Ozan

Thanks much. I'll try a 1N914 and see if that works. Guessing at substitutions is just shooting in the dark anyway. Some circuits are very tolerant and others very fussy about component

If the supply frequency is line, 50 hz or 60 hz, then the 1n4000 series is fast enough.? If the diodes are used to rectify the output of a 25 Khz inverter, then the 1n4000 series is way too slow, you

I might add that the diodes in this supply are probably fast types so 1N4000 series would not do on the switch mode side. If the supply is similar to the 2246/2247 series I remember fixing one where

I'd be very cautious working on one of those PSU's, without a fully isolating AC transformer to power the 'scope while you work on it. One false move and short something to "Chassis Ground", and BANG!

Q908 is a PNP transistor, what you replaced with (2N5551) seems to be an NPN transistor. What was shorted to burn R908? Ozan

I want to thank you all for your suggestions and support. Last night I was checking test point voltages when R908 caught fire. The heat wiped out CR908 and damaged R909. Q909 tested bad but appeared

When they all read low like that, it is usually due to a filter cap that is hanging on by its fingernails. The cap puts out excess ripple, and the control sees the peaks of the ripple, but your meter

If the inverter outputs are all low then I'd be looking at the following, in no particular order: 1) inverter duty cycle if too short 2) inverter control signals if cause too short a cycle 3)

Hi Dave, I unloaded the +8,6v, +5.2v, -8.6, +100v and +30v lines. The 100v reads 91v, the 30v reads 27v, and the 5.2v is 4.92, or all about 10% low. The 8.6s wouldn't regulate properly with a load,

Thank you for that. It helps.

Thanks much for that advice. I will try unloading the PS and take the voltages. The last time I really did much in-depth troubleshooting was in avionics in the old days and there were much more

Take care troubleshooting PSU's where an output "seems" not to regulate properly / not achieve the specified voltage. General advice, valid for all sorts of systems, not just 'scopes... That rail's