I suggest using an IDE to SSD adapter as CF adapters can play "strangely" as you have found. D.

Replacable Parts Records if my memory is working - it is a cross reference of which part is used in which instruments: The RPRs are DL'able from TekWiki: https://w140.com/tekwiki/wiki/Replaceable_Part

My theory is that damp gets into the transformer and when it is next powered on it fails ...

No the vertical amplifier board differs.

I think that a good hf transformer should ring for quite a bit longer than that (maybe 50 or more), but with shorted turns it would likely drop below 10 or so. However, I've never ring tested on of th

If you have shorted turns that won't show up with an ohm-meter, only a ring test will tell you that. David

I suggest you DL the service manuals for both - the 7B87 may look similar externally, but internally there's lots of extra stuff to handle pre-trigger. I'm not saying it's impossible as a modern PIC o

Any bead tantalums at the top of the Cap/Rectifier board (the big ones) should be replaced. Axial tantalums are almost certainly OK (I can't remember if the 7844 supply used those or aluminium types).

If you mean Chuck Harris, no he's not here. You will find him on Tekscopes2. David

You have a probe that amplifies by a factor of ten? I seriously doubt that there's a probe detection resistor value for that! D.

Problem with most MMICs is that they need input and output capacitors and therefore are actually incapable of DC-anything ... Typical circuits start at around 100kHz or higher as the low frequency lim

It's highly likely that the centre conductor is resistance wire (nichrome or similar). This is to stop/reduce reflections. David

Just don't do this if the 'scope has a switching Power Supply (like most 7000 series and later 'scopes). Just plug in an turn on (after checking the voltage selector is set correctly). Dim bulb approa

Both of you, please avoid the use of contentious and inflammatory phraseology. David (moderator).

If my memory is working right, I think there should be a plastic "clamp" at the far end of the tube (I think it is inside the mu-metal shield but maybe not). This can be undone and the CRT rotated. Th

Wow! That's amazing

Yes, It's always the blue ones that crumble. D.

IMHO you should still open an eBay case for this within 30 days of receipt of the item. You may wish to wait until close to the end of the 30 day period if you want the buyer to have a chance to sort

I think you call it typewriter/inkjet printer/laser printer paper - just a two nations divided by a "common" language issue 😊 I say tomato, you say tomayto ... D.

Clean the cam switch contacts (isopropyl alcohol and cartridge paper). D.