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I have been exchanging dialog with a viewer of my YouTube channel who has been servicing his 800K drives in conjunction with my video on that subject.  In particular, he has two 800K drives which show the head moving all the way to the back but then the heads stay there. If the head is then...

@Rjp663 Recapping is the easiest thing to do because you can then connect up everything and check voltages at the external floppy disk connector.  I would advise checking the no-load voltages first after you recap, just to make sure all seems reasonably well, and then after that connect...

@Rjp663 No-load voltage measurements will show oddball numbers like that.  It's not necessary to test in the loaded condition prior to recap, but if you have a batch of resistors and want to see how the voltages change under load, just put a 1/4W or larger 1kΩ resistor between the individual...

@Bolacore When you were doing research into replacing the MFM hard drive, did you know about the DREM?   I am just curious if you knew about the DREM but decided upon the BeagleBone solution for a particular reason.  In terms of cost though, your chosen solution is cheaper overall.

@ZaneKaminski We've not heard from you in a long while, and I've not received any replies to the PMs I sent to you way back in August 2020.  I see on your profile page your last visit here was Jan. 13th 2021 though.  That indicates you are still visiting this forum, and as such I'd certainly...

Actually, the real reason to build a cable rather than merely EXTEND the stock cable is if your stock cable has corroded contacts and aging wires that show higher than normal resistance, which I have seen on my own SE/30's.  The end result of a lackluster stock cable is lower than expected...

Just play a few hours of Wolfenstein 3D and then read through it again.  You still won't understand it, but it will be far more enjoyable! ;-)  

@pinto_guy I certainly appreciated our private conversations, and I must say that I am also very appreciative of your willingness to share further insights publicly in your latest post today.   That MacColby makes me think of the Lisa, only portable.  "Portable" back in those days being more...

I do not have one of those over-price crimpers which are made specifically for particular terminals.  I have a cheaper, general use crimper that I simply take care in using.  The dedicated crimpers are better, but I don't do enough crimping to justify the sky high cost.

As to the best replacement wire, there's a tradeoff between the lowest resistance and wire flexibility.  As much as I'd love to use 16AWG wire, it won't fit the terminals, so we need to stick to 18AWG.  See page 3 of the chart below for 18AWG wire.  As you can see, the lowest resistance wire...

@ymk Thank you! More specifically... For those wanting to make a cable that merely EXTENDS the stock SE/30 cable, you will need 1pc of the Female connector here (which has pins already inside): https://www.amphenol-icc.com/minitek-pwr-4-2-101278201422lf.html And then you will need 1pc of the...

There are times when you want to make a very long, custom cable so as to pull the SE/30 motherboard outside the chassis for easier testing while still being able to power up the machine.  Until now I've been soldering wires onto testing points and pulling those wires outside the chassis, but...

I've not had the time to add the International Analog board to my Google Docs Spreadsheet.  Another problem is that I do not own one so I cannot give it a physical look-over like I did with the US Analog boards. The yellow glue/epoxy in the photo of the flyback looks to be in great condition...

If someone can find data sheets for those sound chips, I would be delighted to have have a copy!  But for now, I am not holding my breath.  The choice of a 1uF was likely deliberate.  Sometimes they are used in timing circuits so you have to be careful.  When it doubt about the purpose of a...

I would just use a 50V 1uF Tantalum (Solid or Polymer). It’s only one cap so it won’t detract from the stock look if all other replacement caps are OS-CON.

Details are found on the 68080 wiki here.

I've never felt compelled to do that.  The only PPC machines I currently own are my G4 Cubes and PowerBook Wallstreets, mainly because if I want a fast Mac that runs modern software, I will use a modern Intel Mac.   My primary love is for older 68k Macs, especially the 9" CRT Macs like...

Actually, Jeff mentioned he has a Classic II, so I checked the 47µF & 10µF motherboard caps which are commonly replaced with Tantalum and highlighted all of those in Yellow in this modified Classic II Bomarc schematic. Specifically: C3, C4, C5, C6, C7, C8, C10, C11, C12, C13, C14 C5 sees...

@JC8080 mentioned to me today that he recapped his Mac Classic motherboard with 16V Solid Tantalum capacitors.  I downloaded the schematics and had a look.  Unfortunately, C8 & C9 definitely have 12V across them; and C1, C2, C3 & C4 are all on the Sound chip which means some might see...

I personally don't mind your posts here because what you have written thus far provides important proof which shows Solid Tantalum capacitors do fail even when chosen by big name manufacturers, and no doubt the voltage rating of those caps played a big role in those failures.  With that said, a...