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Heathkit SB221 Inspection

The 330uf filter caps will improve the regulation of the HV supply, but they have a drawback. The power-on surge will be large enough to weld the contacts on the power switch before long.

Bigger filter caps are okay, but some kind of soft start would be a good idea. That power switch is a pain to replace, if you can find one.

And a bigger pain if you can't.

Harbach has a board for this that will fit under the chassis of a SB-220.

73
 
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357,
You ever use Acetone for flux removal? I buy it at Lowe's for about $7.00 a quart. It can be had other places as "Nail polish remover" for about $10.00 a half pint.

I have found it to work better than alcohol.

73
David
 
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I ran into a snag.
I noticed that the screws in the capacitor box are supposed to be "flat head" to sit flush and they are pan head in there and hanging up and distorting the plastic holders.
Gotta go to the hardware store tomorrow.

IMG_4950.JPG IMG_4951.JPG IMG_4952.JPG


Also the acetone seems to smear the flux around and get sticky.
I think the alcohol is easy to use.

IMG_4944.JPG IMG_4945.JPG IMG_4946.JPG









This is after with alcohol swabs
IMG_4948.JPG IMG_4949.JPG
 
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Also the acetone seems to s,ear the flux abound and get sticky.
I think the alcohol is easy to use.

(y)

Maybe it has something to do with the material the boards are made of. I can't seem to put my hands on anything newer than 30 years old!:(

It's looking like you will soon have a brand new Heathkit soon!!

73
David
 
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I went to every hardware store in town.
Shortest they got is 6/32- 1/2"
I need 6/32 - 1/4 or maybe 3/8.
Now everythings on hold, I'm kinda pissed.:sick:

Harbach didnt mention if I should use the flat washers, anyone know?
The other thing is the plastic "blocks" hang out the bottom of the capacitor bracket.
Is that normal?
 
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