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Check the solder joints of the power connector. I had one classic where they were broken and the AB did not get 240 V.

The first mac plus had 1MB RAM. The case had the same color like the 128k or the 512k. Later there was a case with platinum color. The main difference to the 512k was a SCSI port and a larger ROM. AFAIK there were two or three different ROM versions.

But a SE logic board is often in good condition. I did not see a SE with an exploded battery (like a lot of SE/30s).

The ROMs should be taken out and checked for corrosion. Perhaps a cleaning may help. You can burn new ROMs with an adapter an 27C010 Eeproms. https://68kmla.org/bb/index.php?threads/macintosh-se-eeprom-to-rom-adapter.37766/

Could this be used as a Localtalk-Ethernet bridge? The old Asante bridges became expensive in the last years...

As far as I know, the SE has a 256 kB ROM am the Classic a 512 kB. May be this is a problem? For the SE there is a adapter pcb to use Epromms. https://68kmla.org/bb/index.php?threads/macintosh-se-eeprom-to-rom-adapter.37766/

Cleaning of a floppy disk drive:

My tests were successfull. With a Pascal program that measures temperatures I could read analog voltages in port B and all four channels. Many thanks to tashtari and aladds for the development of soft- and hardware. Now I will try to develop my own Pascal program that can measure forces on a...

Thank you! I will try this.

Does anybody of you have a working copy of the ADB_Io_Software.sit.hqx file? I am building a waspIO (Aladds) and wanted to test the function with some software. Should we copy the software to macintoshgarden?

In germany there where sold SEs sometimes as SE 1/20 or 1/40 with HDDs of 20 and 40 MB. They were often sold to students. I never saw a 2/40.

And check the solder joints of the power plug.

There are a lot of parts on classic AB that can be defect. Most often: DP3 and DP4 (1N4148), TDA4605, CNY17G, IRFBC40. Fuse is ok? Did you measure voltages at floppy port? Means dead that you get 0 V? Are the solder joints of the power connector cracked? Resoldered?

Did you try the classic II logic board in the classic? If it works there you can be sure, that the LB is not the problem.

Did you recap the board? Problems with the sound are most often solved after a recap.

0038 means that F9, F10 and F8 are defect.

For some macs there are 3D-printed bezel adapters available: https://www.thingiverse.com/thing:3551263 https://www.thingiverse.com/thing:4565768

Perhaps you should read this, before you do something with the magnets. https://68kmla.org/bb/index.php?threads/what-i-learned-fiddling-with-crt-magnets.44631/#post-489680

There are a lot of parts on classic AB that can be defect. Most often: DP3 and DP4 (1N4148), TDA4605, CNY17G, IRFBC40. I would replace them all.

Sometimes the pp1 needs some cleaning with ipa and sometimes it needs to be replaced. You can measure the resistance when you turn it. May be the resistance will not change.