Salvaged components, weird resistors, and unmarked trannies?!?!?

[greenacarina]

OK, so I am a total dumpster-diver (not literally, but close enough) I'll admit. I've ended up saving tasty-looking components from dead electronics in the hopes of building something way-cool with them. So I have a few questions for you veterans-
1) Have you ever built a pedal strictly out of salvaged bits just to go for "the ultimate in recycling"?
2) How can I identify unmarked transistors? They appear to be Ge, but no numbers or anything (see pic)
3) Has anyone ever seen resistors like these??

[greenacarina]

Anyone???   

[Dirk_Hendrik]

yep.
In equipment I picked up on the street some 14 years ago in former Eastern Germany.

[Sir H C]

Often those style resistors are used in RF stuff where they are a ceramic core with the metalization on the outside for the resistance.  The transistors, you need a diode checker (often found on a multi-meter) to figure them out. I think the www.geofex.com site talks about how to do this.

[bancika]

I like recycling. I'm gonna make fender princeton partially with salvaged components from old radio: power transformer, output transformer, chassis. But my opinion is that everything is gonna sound better and with less noise with new hi quality caps (poly) and resistors (metal film). Just my .02

[Paul Perry (Frostwave)]

While we are on recycling & dumpster diving, here are two chips to look out for:
the 78H05 5A 5V regulator (looks like one of those big TO-3 power transistors) shows up in early digital stuff, and the RC4200(or NJM4200) multiplier in early video projectors & AV gear.
They are both unobtanium now.. the first is needed for pinball machine repairs, and the second for the Korg X-911 guitar synth.
If you find them, you can swap or sell for other parts, no problem.
A list of valuable chips would be a Good Thing.

[Rick Hardslab]

What makes the 78H05 5A unique from other 5V regulators?

[Seljer]

What makes the 78H05 5A unique from other 5V regulators?

The differences seems to be, that it can regulate up to 5 amps, which is a good bit more that the common regular 7805

[birt]

i've got a bunch of those from a very old tube amp. they haven't drifted in value quite as much as i expected