SB 300 project

[Charles W. Morehouse]

Hi Ken,
I assume you have an HP-23 power supply. You can get new Mallory caps from Mouser. 140
mfd at 450v PN 539-CGS450V140 at $9.21. Also need the mounting rings as they are not tab
mount. The rings are PN 539-VR3 at $.75. These caps use the same mounting holes so no
drilling is required. The caps are isolated and the case insulated.
They also fit the Apache and probably other transmitters. Just got some and the are
perfect. Luck and 73.
Wayne;
W4GBW
PS. Mouser also has a great supply of axial and radial caps. Have used a bunch.

Ken Ketner wrote:

> Greetings helpful greenies:
>         Thanks to suggestions from several kind respondents, my loss of all
> bands on the SB 300 has been overcome. The oscillator tubes (HET and
> LMO) had no filament voltage. What I thought was the good ole glow
> turned out to have been a reflection of my work lamp in the tube glass.
> Ain’t that a good one. When I traced it out, found a loose lead in the
> filament string, resoldered it, then BINGO, all bands come alive.
> Filament voltage is a nice thing to have! It was the HET and LMO as you
> guys suggested, only not in a very exotic way.
>         Now the set has what sounds like a hum on top of the audio. I will
> probably have to bridge the electrolytic can with some axials. But it
> should be fixable now that the main puzzle is solved, thanks to the
> leads you guys offered. I think I will do a complete alignment also.
>         Does the front end hop up with tube upgrades work on the SB 300 like it
> does on the 301?
>
> Many thanks
> --
>
> Ken Ketner
> ARS KA5ELD
>                 Personal Webpage: http://www.wyttynys.net
>                 Office Webpage: http://www.pragmaticism.net
> Email:
>         home:   ketner at arisbeassociates.com
>         office: b9oky at ttacs.ttu.edu
>
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