Actually Jim , I recently had a problem with a 3-500 where it would not light
yet showed continuity with an ohm meter , it happened that the connection would
break under load, I fixed it by cutting into the side of the pin with a 3
corner file and running in some high temp solder with a pen torch and a
hemostat clipped onto the tube pin at the seal to sink some of the heat
......................................................................................................
73 VE3DV , Dave
> From: jim.thom@telus.net
> To: amps@contesting.com
> Date: Wed, 17 Nov 2010 17:05:18 -0800
> Subject: [Amps] older 3k
>
> Date: Mon, 15 Nov 2010 15:28:10 -0500
> From: "MR.DEBONAIR" <debonair@centurylink.net>
> Subject: [Amps] older 3k
>
> I HAVE THE OLDER 3K AND THE TUBES STOP LIGHTING UP. DOES ANYONE HAVE ANY
> IDEAS?
> THANKS,
> JIM ARNOLD
> DEBONAIR@CENTURYLINK.NET
>
> ## I believe the henry 3-500Z amps wire the fils in series. IE: they use a 10
> V @ 15V fil
> xfmr, instead of a 5 V @ 30A fil xfmr. IF one tube's fil goes open.... they
> BOTH go out.
>
> ## There is plenty of air with the squirell cage blower set up, and chimneys,
> so dunno why
> the solder would melt on the fil pins. You may want to check the fil pins,
> and also the
> socket contacts itself. Easy to see if either fil went open, just stick an
> ohm meter
> across each one.
>
> ## If you see any ....'blue' on any of the socket connections or tube fil
> pins, then you know the
> temp has hit at least 700+ DEG F at some point in the past. You will see that
> same blue colour
> when you look at the oven racks in ur wifes oven..after you have run it
> through the self clean cycle.
> You will see the same blue on the ends of soldering Iron tips as well.
>
> ## make sure the fil xfmr/bifilar has 10V from it. [ or 5 v if tubes in
> parallel].
>
> later... Jim VE7RF
>
>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|