[Lowfer] Clean bench

[Mitch Powell]

> In spite of the success and neatness of that amp I'm going to have to give
> you a failing grade on the overall construction. You have TO-5 transistors
> and heat sinks to boot. Shame! <G> This design calls for TO-92 plastic
> devices and no heat sinks. To test efficiency you place your tung on the
> transistors .... and I am 100% serious! (Ask Mike S)

I know - but I was chicken - and usually overbuild these things. It's now
very obvious that the heat sinks can be tossed. Can't detect any warmth.

The transistors though - are re-cycled. I de-solder from computer/control
printed circuit boards. It's kind of difficult to get a 4060 chip off when
it's soldered on both layers, but it can be done.
Those transistors are - 2N2218A and 2N2904A - which came from a board with
half a dozen of each - so it looked like the price was right !
Lower hfe than the 2222/2907 set - ( B = 90 instead of 200 )
but ft is 150 Mhz - so they work.
I am re-doing the board, now that all the mods are complete - and will
send out to the deep-freeze next week.
The picture shows the amp/DDS synthesizer exactly as they are working on the
air. Of course, you know that the moment I move them, and place in a nice
box - they will quit ! !

See you later

Mitch