HW-16 power supply rebuild

[Dave Edwards]

That is more than close enough!
...Dave
----- Original Message -----
From: "Gareth Gammon" <ggammon at QLYNX.COM>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Saturday, January 19, 2002 9:37 PM
Subject: HW-16 power supply rebuild


> The power supply on my HW-16 finally gave up; R206,  a
> 220ohm 2w resistor burned clean through and probably took
> two sections of the main filter cap with it. I am planning
> on  replacing all the high wattage resistors in the high
> voltage section and the filter caps. My problem is the
> filter caps. I am going to use modern axial caps and leave
> the can in place but disconnected however I can only come
> close the original values. There were 4 sections to the can;
> two 80mfd sections as well as  a 40 and a 50mfd section. I
> can get 100mfd caps to replace the 80's and thought about
> using  47mfds for the 40 and 50mfd sections.  All caps will
> be rated at 450v. There don't seem to be too many choices of
> values in high voltage caps these days and putting two in
> parallel doesn't really solve the problem either.
>
> I'll also have to check out the rectifier diodes and may be
> back for cross reference info. All the parts list says is
> they are silicon diodes and gives a part number.
>
> Does anyone see a potential serious  problem in substituting
> the values I mentioned?
>
> Thanks for any help. 73
>
> Gareth Gammon VE7CGG
>
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