SB-610 help

[Charles W. Morehouse]

Hi Al,
Have restored a bunch of HO-10,13 and SB-610, 620's.  It could be the 
CRT but most likely the components in the HV circuit are getting tired.
Replace them all.  The diodes and resistors can be had cheaply from 
Mouser.  Use 5% metal film resistors and the diodes are about fifty cents.
For caps, use .05mf @ 1600 v  Orange Drops from Antique Electronics.  
Use two in parallel, they work fine.  Have not had problems with the 
restored units.
Luck, 73.
Wayne;
W4GBW,


Schichler, Alfred wrote:

>I have an SB-610 that has a very dim trace on the CRT, compared to other
>ones I have seen, and I was wondering if that is typically caused by the CRT
>itself, or is there some other part (s) that might cause that. I found
>several resistors in the high voltage circuit that were way off, so I
>replaced them, and now it is a little better than it was (at least the focus
>works better), but not nearly as bright as I would like. 
>
>Also, the tone generator does not work at all (either tone). I tested the
>tubes, and the 6J11 in that circuit read a bit weak and a bit leaky, so that
>might be the reason for that, but I was wondering if there is another common
>problem that might cause that.
>
>Thanks for any help,
>Al, NE2D
>
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