[Boatanchors] [Heathkit] Heathkit SB-610 monitor scope

[R Johnson]

Hi Dick:
I have a couple of SB-610's. One has a shorted HV cap. The other is working for now,
but the focus is starting to get a little fuzzy.

My question is where do you get the 0.15 uF 1600 VDC caps ???

The original ones are AREOVOX  Part # B161Y66.
Is there any substitute for these ???
What did you use ???

TNX es 73
Bob, K1VU

At 08:25 AM 11/7/2011, Dick KF4NS wrote:
>Decided to dig into it again since I had not done much with it since I got it 2002 and replaced all the
>power supply caps. Recent testing showed poor focus and low vertical gain.
>
>I found the two B+ diodes shorted. Wow, never saw any selenium rectifiers that looked like those two. The
>focus problem should be fixed after replacing the rectifiers and a few resistors. About those diodes, I
>will likely use a couple 1N5408s but the usual thing would be to series a resistor with each anode lead
>which is usually a good idea in power supplies with original seleniums. In this case though I wanted to
>get you input because I noticed that the capacitors are not electrolytic and there shouldn't be the usual
>increase in voltage. What do you think? One chap has a solution online whereby he used 4 1N4007s in
>series for each replaced diode which I guess he thinks will make up for not using series resistors.
>
>I also observed that the blue and yellow xfmr leads are reversed but don't believe that should be a
>problem since we are looking at AC here and don't think secondary polarity should be of concern here.
>
>I have a couple options here will take care of the vertical gain situation. Got that covered.
>
>73, Dick KF4NS
>St Petersburg, FL 33714 USA
>Keep The Glow!
>
>
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