[Hammarlund] Re: SP-600 Question

[James A. (Andy) Moorer]

----- Original Message -----
> Need some more advice. James, on your site you refer to 47uF, 450V
> special high ripple capacitors. The only source that I can find for high
> ripple caps is from Digi-Key, their P/N P5951-ND. They are Panasonic EB
> Series. Are these the ones that you use. If not, what is your source.

That's them. They are quite rugged. They don't seem to heat up at all in
operation. They are probably overkill.

> Also you have added disk ceramics across the electrolytics. What's the
> purpose. Nice work and the photos are very helpful.

Well, they are probably not absolutely necessary. They are .01 at 1000 V.
They are for additional surge protection and also just to make sure there
isn't any RF running around in the power supply.

You should put a 'scope on the power supply sometime. It is quite
interesting - the power supply voltage waves up and down by several (!)
volts depending on the signal (!!)

>
> Also in a previous post I indicated that L52 had been overheated and
> that the bottom cover had partially separated from the case. A follow up
> question. The inductance of  L52 measure 30HY, required is 20HY. L51
> measures 9.5HY, required is 8HY. Comments please.
>

Those values are well within bounds. In general, the more the better. The
cores of those things are made of many iron leaves just pressed together.
Sometimes after 50 years they fuse a bit which may cause the inductance to
rise. I don't see any cause for concern unless the resistance has gone up
sharply. That would indicate frayed or cooked wire to me. Although these
inductors are pretty sturdy, I have seen them open, but I have never seen
one that was marginal - it either worked or it didn't.

I might ask how you measured the inductance.

Hope this helps.

James A. (Andy) Moorer
www.jamminpower.com