SB-610 P.S. diodes

[Robert & Linda McGraw K4TAX]

Diodes D1 - D4 can each be replaced with a single 1N4007 device.  In the 
case of D5 & D6 you will need 2 of the 1N4007 units in series to replace 
each of the diodes D5 & D6.  Also a 100K equalizing resistor should be 
placed across each of the series diodes.

It is a very good idea to replace the capacitors.  These are 0.15 MFD @ 1600 
V, and at two places, 0.1 MFD at 1200V.   History has it that when a cap 
fails one is most likely to loose the HV winding on the power transformer. 
Not good.

73
Bob, K4TAX


----- Original Message ----- 
From: "Allen KJ6XH" <kj6xh at EARTHLINK.NET>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Saturday, February 04, 2006 4:09 PM
Subject: SB-610 P.S. diodes


>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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