Doug, I don't think that no one here knows anything about Ameritron
amplifiers as much as no one here has the schematic diagram memorized to the
point of knowing where D16 is located in the circuit.
Perhaps you could describe D16 circuit location?
73,
Gerald K5GW
In a message dated 11/10/2009 8:09:44 P.M. Central Standard Time,
ve5ra@sasktel.net writes:
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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