germanium transistor audio amplifier

From a Signal 500E radio actually 🙂

If you put it on its front it looked like a 'proper' HiFi receiver. It had a DIN socket and I've a vague recollection you could press two buttons together to get a line input. My speaker was a three way home made job made from a chopped up radiogram. The drive unit was a 10" Elac from a local junk shop and an oval mid along with a tweeter of some sort. Can't remember the details now.

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For what it's worth, if you want to play with a small single supply germanium amp that already has all of the parts to work or to modify your own, I suggest picking up one of the many late 60's or early 70's 8-track players on ebay for under $30 including shipping. You will get the matching interstage transformers, thermistors, and a selection of older transistors including the driver set already in circuits that can be easily modified. I have torn two apart and used them in other DIY projects (one of which is my Germanium Bake King ) and I am learning a ton about germanium biasing, basic transistor circuits, and feedback. Great fun for almost no money. -Warren

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