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Some more pictures: This is how the monitor looks with 640x480. It's scrolling quite fast hence I didn't notice the "wraparound" of the Monitor control panel (the right part of it can be seen on the left side of the screen). Inside: Yes, it's made by Hantarex... Caps look generally good...

I had used this very monitor on that IIsi before, so I know that this combination works. It also seems as if there were a couple of different Portrait Displays: M0404, M1030 and M1031. The 13W3 cable is an Apple cable. The 4400 offers 640x870 resolution but the monitor won't sync to it...

Update: I can also get some sort of picture out of it with 1024x768 and 74.9 Hz refresh but not with any other refresh rates at that resolution. Surprisingly I also occasionally get something out of it at 640x480 and 60 Hz: a constantly and quickly scrolling picture that otherwise appears to be...

With 640x870 I'm not getting any useful picture at all on the 4400, just a flickering screen, mostly black. Also: The upper photo is on a IIsi which actually recognizes the monitor as 640x870 and tries to drive it at that resolution...

Many years ago one of my students gave me a IIsi with the above Portrait Display. I've always liked that combination and used it occasionally as a terminal for a Synclavier. After putting everything in storage and moving a few times I thought it was time to break out all those oldies again...

I'm currently preparing to recap a SE/30. First time for me so I'm taking some precautions. Now most electrolytics go from a voltage rail to ground, in fact nearly all of them. However there are a couple of electrolytics in the audio circuit as well. C3 and C4 are directly in the audio path so...

I'm not completely sure but the cap next to U22 (partly obscured by the SIMM) looks suspicious. The PCB around it has that "dusty/oily" look that I associate with a leaking electrolytic cap. Of course this also could be "normal" dust...

Electrolytics vs. tantalums: That's an interesting question. I'm planning to recap a SE/30 and a IIsi in the near future and I'm also somewhat torn here. I've seen tantalums fail in vintage musical instruments occasionally but not regularly. Macs from the early 90's clearly used both...