on a lark i decided to try to load the raw binary data into Audacity, and it works!

ooh, looks like a good dump!

i'm dumping it as a 27C400 but doing it in two halves (thus the switches soldered to the socket)

today at the electronics flea market i picked up this SOP socket so i can take a crack at dumping the wavetable ROM!

isn't it ironic, don't you think

now here's a fun floppy disk.

got any charges to neutralize?

this tube tester uses a punch card to program the settings for specific tubes.

looks like this tube has gone a bit gassy

ooh nice curve tracer.

at some point RF engineers just have to admit that they're plumbers.

interesting turntable is very vertical

electronics flea market thread! 🧵

this is at West Valley College in Silicon Valley.

so it looks like there are 4 different values of electrolytic capacitors on this board. if anyone has a Gravis Ultrasound PnP, do you mind reading off those values for me? capacitance and voltage rating would be great!

and now it is time to reinstall the parts.

i have some UV cure soldermask in a variety of colors. you just paint it on and expose it to UV light. sometimes i'll put a piece of plastic on top to flatten it out.

where was i? oh yeah, repairing this card. so these traces were carved through and cut, and i've reconnected them with fine wires.

it's easy to remove the solder mask using a fiberglass pen, although they're terrible about leaving tiny fibers everywhere. i'm careful about wearing gloves and cleaning up...

that wasn't so bad. two days for a complete clone.

*sigh*

there was corrosion lurking underneath components. what a mess.