[Boatanchors] SPEAKER SWITCHING

[WA5CAB at cs.com]

The general rule is that it's safe to short the secondary of a tube amplifier 
output transformer and unload (open) the output of a bi-polar transistor 
amplifier.  The reverse in each case is a no-no.

In a message dated 8/7/2006 6:15:50 PM Central Daylight Time, ehertz at tcaf.org 
writes: 
> nterestingly enough, I recently (accidentally) did this on my SP600. 
> Shorted both 600-ohm speaker terminals to the chassis. Had it that way for probably 
> 1 hour while I tried to figure out why I had no audio coming out of the 
> radio! I am very happy to tell you, there seemed to have been zero detrimental 
> effect, quite to the contrary of my intuition!
> 
> Eugene
> >-----Original Message-----
> >From: James Duffer [mailto:dufferjames at hotmail.com]
> >Sent: Monday, August 7, 2006 05:47 PM
> >To: normn3ykf at stny.rr.com, boatanchors at mailman.qth.net
> >Subject: Re: [Boatanchors] SPEAKER SWITCHING
> >
> >And while we are on the subject, what is the result if the secondary of the 
> 
> >output transformer is shorted. By shorted I mean the two output leads are 
> >connected to ground at the same time. 
> >
> >Jim, wd4air 
> >
> >
> >>From: "Norman J McSweyn" <normn3ykf at stny.rr.com> 
> >>To: <boatanchors at mailman.qth.net> 
> >>Subject: Re: [Boatanchors] SPEAKER SWITCHING 
> >>Date: Mon, 7 Aug 2006 05:52:42 -0400 
> >>
> >>Gentlemen, forgive my ignorance: 
> >>Is it really possible to injure (i.e. open secondary, secondary shorted to 
> 
> >>primary, or some other mischief) an audio output transformer? 
> >>How does this happen? 
> >>tnx, 
> >>Norm n3ykf 
> 

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