SB-610 P.S. diodes

[Stu Lyon]

Hi Allen,

The selenium rectifiers can be replaced with two 1N4007s in series -- 
I've done it on two -610s and a -620. They should be from the same 
manufacturer and hopefully from the same lot (or bag) so as to match 
reverse resistance as close as possible. You can use single 1N4007s for 
D1/D2 and D3/D4

I also replaced all the electrolytics with modern radial-leaded caps, 
installed under the chassis. I think I installed additional terminal 
strips to mount the caps (it's been a while).  I replaced the 
high-voltage filter caps on only one -610 but not the other two -- it 
didn't seem necessary. The only resistors I replaced were the high value 
ones in the focus / intensity circuits. They were really off.

I have a question for you about the display of the SB-610: On both the 
units I rebuilt the display on CW is sort of a reverse keystone or 
trapezoid. The horizontal sweep width is slightly less on the top of the 
display as compared to the bottom of the display. The setup is the same 
as fig 4, pg 41 of the manual. Does yours do this and if so, do you know 
why?

73, Stu W6CUX

Allen, KJ6XH wrote:

> I gather Diodes  D1 thru D4  can be replaced with 1N4007s.
> But, what about those selenium diodes- D5 and D6? Just stack a couple 
> of those
> 1N4007s for each leg--or, what do you suggest? (Gotta have some good 
> P.I.V. here!)
>
> I know about changing out ceratinresistors in the H.V. rectifier 
> circuit. But, I
> don't recall seeing anything mentioned about the filter electrolytics 
> and resistors
> in the lower voltage rectifier circuit.
> Do they hang-on like the Eveready Bunny?
>
> Thank for info.
>
> Allen, KJ6XH
>
>
>

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