[Amps] FW: B- questions

[TexasRF at aol.com]

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 at 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 at contesting.com  [mailto:amps-bounces at contesting.com]
On Behalf Of Doug Renwick
Sent:  November 9, 2009 11:41 AM
To: amps at 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 at contesting.com  [mailto:amps-bounces at contesting.com]
On Behalf Of Bill, W6WRT
Sent:  November 8, 2009 9:02 PM
To: amps at contesting.com
Subject: Re: [Amps] B-  questions

ORIGINAL MESSAGE:

On Sun, 8 Nov 2009 18:43:18 -0500,  "Carl" <km1h at 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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