[Boatanchors] Heathkit SB-610 monitor scope

[Dick KF4NS]

I used GE 42L3s, the 1600V is a 42L3152. I believe I got them from Mouser.

73, Dick KF4NS
St Petersburg, FL 33714 USA
Keep The Glow!

----- Original Message ----- 
From: "Rob Atkinson" <ranchorobbo at gmail.com>
To: "Dick KF4NS" <kf4nsradio at verizon.net>
Cc: <boatanchors at mailman.qth.net>
Sent: Monday, November 07, 2011 12:51 PM
Subject: Re: [Boatanchors] Heathkit SB-610 monitor scope


| what did you use for the p.s. caps, in particular the 1600 v. one?
| Where did you get them?
|
| tnx 73
|
| Rob
| K5UJ
|
| On Mon, Nov 7, 2011 at 7:25 AM, Dick KF4NS <kf4nsradio at verizon.net> 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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