Thursday, November 24, 2011

The Motor That Pushes the Speakers

As you've seen I've made fancy speakers. I needed something equally fancy to push those babies to produce really sweet sounds. I've always liked tube electronics ie: hollow state, thermionic valves, etc. I've even built a couple of tube amplifiers with scrounged parts. I found a site where I could order a complete (well mostly) kit to build a copy (or re-imagining) of the legendary Dynaco ST-70. I bought the kit thinking it would provide me with entertainment during my vacation. I haven't been the manufacturer of the kits for a good reason. Their shipping is horrible, when it got here there were parts missing, their customer is next to non existent, I've had to scrounge the internet to find instructions that should have been supplied with the kit. That being said the amplifier is mostly done but I'm still waiting for the actual tubes to get it going.
First picture, just started. I screwed and bolted all the bits to the chassis (the metal box that looks like a cake pan). The wires come out of the three transformers and one choke that are the heart of the amplifier (if the tubes are its soul)
That's me working away on it in what has come to be known as my laboratory (basically a 3' X 3' square of floor between boxes and other sundry storage in my sister's basement). Notice headphones supplying laughs and music while working. I took the picture with my butt. Not a joke, I plugged a bit of wire into my camera and soldered a switch to the other end. The switch is under my bum so I could trigger the camera without the wire being apparent in the finished picture!
And there you are, mostly complete. Well, the circuit is complete anyway. Like I said, I'm still waiting for the tubes so I won't know how it sounds until I come back in late January.

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