Since Ameritron calls it a safety diode I thought it was obvious. I simply
got bored with the thread and didnt bother replying..
Carl
KM1H
----- Original Message -----
From: "Doug Renwick" <ve5ra@sasktel.net>
To: <amps@contesting.com>
Sent: Tuesday, November 10, 2009 9:09 PM
Subject: [Amps] FW: B- questions
>I never had a single response to my question. With all the implied
> knowledge on this reflector about Ameritron amps, there doesn't seem to
> be anybody with enough knowledge to answer my question with a yes or a
> no. So I must presume that no one here knows anything about Ameritron.
>
> Doug
>
> I'll run the race and I will never be the same again.
>
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]
> On Behalf Of Doug Renwick
> Sent: November 9, 2009 11:41 AM
> To: amps@contesting.com
> Subject: Re: [Amps] B- questions
>
> In the Ameritron AL-1500 are you referring to diode D16, 1N4007 on the
> filter capacitor board?
>
> Doug
>
> I'll run the race and I will never be the same again.
>
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]
> On Behalf Of Bill, W6WRT
> Sent: November 8, 2009 9:02 PM
> To: amps@contesting.com
> Subject: Re: [Amps] B- questions
>
> ORIGINAL MESSAGE:
>
> On Sun, 8 Nov 2009 18:43:18 -0500, "Carl" <km1h@jeremy.mv.com> wrote:
>
>>
>>I'll repeat one more time. The dinky diode doesn't prevent tube and
> circuit
>>damage, it shorts after the damage is done.
>
> REPLY:
>
> You are half right.
>
> I agree it won't prevent tube damage, but it will indeed prevent damage
> caused
> by the B- line being driven to the full HV negative with respect to
> ground.
>
> Think about a negative 3000 volt pulse being coupled back through the
> input
> circuit to the output of your transceiver. Think about a negative 3000
> volt
> pulse appearing on the cathode of your tube if the filament is DC
> grounded. If
> the filament is connected to the cathode, think about a 3000 volt pulse
> applied
> to the secondary winding of the filament transformer. Think about the
> tube
> socket, the tuning caps in the input circuit, etc, etc... Few if any
> of those
> components will withstand the full HV. Get the idea?
>
> Thank goodness for the dinky diode! :-)
>
> 73, Bill W6WRT
>
>
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