Hood Amp Bridge

[Strelok]

Hi Kevin!

First of all: thank you, I had a good long laugh.
What a story.
I picture all the students making that... should be easy no?

Ehm... no.

Quite a compliment indeed if they compare your work to a factory amp.

You saved me much work!
The thing is: I could check everything and maybe find something wrong.
But in the end it just won't work well.

I did not expect this.
It is not a high frequency project, or so I thought...
Turns out it becomes a RF-amp when not laid out right.

And then it will not even work. That's harsh

I tinkered with a tube stage once that had very long cap leads, just for testing.
And voila, only very soft squealing. Cancelling all over the place.
So now I know that it can even get to the point it does not work at all.

I never solder semiconductors for longer that one and a half second.
And they always work so that should be fine.

The power supply is very stiff when operated isolated, with no bleeders the power just stays on.
So the feared diode bridge should be OK, otherwise it would have ruined the filter caps.


Thanks for all the info.
Yes I read all your notes in TOT, also about the RF traps.
Very good axample about that "bulb in a box".

I don't know if I feel like making it perf-board-stylee.
That's because I don't know if I will like it enough for doing that.

I am sitting here now with a Hammond 186F36. It gives 36 V (2 x 18 V) at 2,7 A so that should be enough for this project.
Plus a closed enclosure with a bottom plate. It is 17" or so and 3U I guess.
No ventilated cover so not good for tubes.


Ah well.

I like the idea that I started out all wrong without knowing it.
There I was, happily inhaling the fumes...

I love working with turret strips.
Power supplies work very good with them.

So I was very pleased that I managed to get everything to land on the strips just right.

Why I find this funny is because those things always remands me of comic books or cartoons.

An I had a lot of fun doing this project.

Thanks all!