IBM Board Collection

[chambersjr]

There's a post somewhere where GSP says that the boards with the solder grid and the square aluminum cap chips that have the connectors sheathed in a greenish plastic shell used to pay out $70/lbs back in the 1980s or 1990s. There is apparently a 10K gold square overlay on each individual pin. Inspect it closely with a loupe or you can pick at it with your fingernail and feel it.

Are you talking about these? Been holding these for some reason.

Does anyone know if their is anything special about the boards pictured in OT2BNLA's post? I recently came across this exact board. Trying to figure out what to do with it. -- thanks

 

[macfixer01]

If you do strip these boards I would be interested in the tantalum capacitors.

PM for price

Eric



I need to retract what I posted above because I now believe that those are just network resistors. I put some to the torch and they only had a ceramic piece in them. there are so many different types of capacitors that its hard to know them all. if you see some and want to know if they are tantalum that the best way is fire them up. If they burn and leave a rectangle or a cylinder with a wire coming off one end that is a tantalum capacitor. You will not melt the tantalum and it will glow real bright.

I realize this is a very old thread but I was looking for some other information and stumbled across it. Yes the black and amber items you pointed out which are longer than 4 pins (also may be blue and aqua colored) are resistor networks. The 4-pin components can be either a resistor network (no polarity marking) or a Tantalum capacitor (leads marked -++- and part#5615372). Some boards are literally full of those 4-pin tantalum capacitors!