[Amps] B- is ur grade

[Charles Harpole]

OK, I have deleted over 100,000 "B- " messages.  Maybe enuf???

Charles Harpole
k4vud at hotmail.com 

   



> From: dezrat1242 at yahoo.com
> To: amps at contesting.com
> Date: Mon, 9 Nov 2009 08:57:02 -0800
> Subject: Re: [Amps] B- questions
> 
> ORIGINAL MESSAGE:
> 
> On Mon, 9 Nov 2009 10:57:46 -0500, "Carl" <km1h at jeremy.mv.com> wrote:
> 
> >I fail to see where you obtain a -3000V, perhaps its a terminology 
> >confusion.
> 
> REPLY:
> 
> In a conventional GG amp, both B+ and B- are floating with respect to ground,
> except for the connection from B- to ground for the grid current meter. 
> 
> If the B+ arcs to ground anywhere and there is no clamping diode, the B- in
> instantly driven to the full negative HV with respect to ground. If your HV is
> 3000 VDC, the B- ;lead becomes -3000 VDC. The clamping diode from B- to ground
> prevents this. 
> 
> Incidentally, this is why one should never short the B+ to ground when trying to
> be sure the HV caps are discharged before working on the amp. Short B+ directly
> to B- only, not to the chassis.
> 
> 73, Bill W6WRT
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