SB-610 help

[Garey Barrell]

Al -

Usually the dim trace is caused by leaky HV filter caps, the pair of 
0.15 uF caps at 1600V,  AND  the out of tolerance resistors you found.  
These caps are getting hard to find these day, but Mouser and others 
have them.

The tone oscillator circuit is marginal at best, and anything less than 
a new tube will often fail to work.  I've never seen a failed phase 
shift network in this circuit, but others have.

73, Garey - K4OAH
Atlanta

Drake C-Line Service Manual
<http://hr99.home.mindspring.com/R-4C_Servicez/>



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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