[Amps] B- is ur grade

[Jim W7RY]

I've told you a MILLION times not exagerate!

No, we cannot stop because I'm enjoying the discussion.

73
Jim W7RY

----- Original Message ----- 
From: "Charles Harpole" <k4vud at hotmail.com>
To: <amps at contesting.com>
Sent: Monday, November 09, 2009 6:49 PM
Subject: Re: [Amps] B- is ur grade


>
> 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
>> _______________________________________________
>> Amps mailing list
>> Amps at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>