Jerry,
Thanks for your advice.
I have catalogues for all the main UK component distributors, but none stock a
diode bridge in the same package as the one in the Model 260. It's a package
I've never seen before. Take a look at:
http://hoffind.com/ipw-web/productpage/images/VT400T.JPG
So I guess I'll just have to adapt the more usual 1" square packaged part.
73,
Steve G3TXQ
----- Original Message -----
From: Dr. Gerald N. Johnson
To: tentec@contesting.com
Sent: Friday, December 01, 2006 7:46 PM
Subject: Re: [TenTec] Model 260 PSU problem
On Fri, 2006-12-01 at 19:23 +0000, Steve Hunt wrote:> Folks,> > It's turning
into "one of those weeks"!> > I couldn't understand why my new Omni VI was
"unhappy" at full power when fed from my Model 260 PSU, but was fine on the
Hercules II supply. I just had a look with the 'scope at the 13.8v line from
the PSU. At anything approaching full load there was several volts of ripple.>
> A bit more fault finding and it turns out the main diode bridge is open
circuit on one side; the clue was that I was seeing 50Hz ripple, not the 100Hz
you would expect from a full wave bridge circuit.> > The faulty part is a "Varo
R207T". TenTec would probably carry a spare, but it seems a bit unnecessary to
ship from the US if I can find a suitable alternative here in the UK. But I
can't find any reference to the R207T through Google and so don't know what the
spec is.> > My local electronics store has a KBPC3504 rated at 400V PIV, 35A
Ifavg, and 400A surge current costing just Â1.60. It's the wrong case style
but it would be no problem to fit it on the same heat sink.> > Any views from
listers whether this would be a suitable replacement?> > 73,> Steve G3TXQ>
I'd think that for Â2.60 at one of the good UK radio parts places youshould
find one with the same package too. 35 amps and 100 volts isprobably good
enough, 400 volts won't hurt. Which ever it will need theheat sink and keep the
white stuff as thin as possible and the rectifierwill run cooler.-- 73, Jerry,
K0CQ,All content copyright Dr. Gerald N. Johnson, electrical engineer
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