[Milsurplus] BC-9: A Big Road Block

[AKLDGUY .]

OK Dave. Well, it was worth being sure that the diagram was correct
before attempting to fault find. I can't suggest anything else at this
stage.

73 de Neil ZL1ANM


On Sat, Jan 21, 2017 at 4:21 PM, David Stinson <arc5 at ix.netcom.com> wrote:

>
> ----- Original Message ----- From: "AKLDGUY ." <neilb0627 at gmail.com>
> Subject: Re: [Milsurplus] BC-9: A Big Road Block
>
>
> Yes, I understand that the meter would get slammed. Or would it?
>>
>> There was some doubt about the circuit diagram, with the part of it
>> in the vicinity of the key being missing and retrieved from somewhere
>> else.
>>
>
> Thank you for writing, Neil.  The diagram is correct;
> the key bypasses the meter and C5/R5.  R5 limits the
> B+ on the RF tube to about 70 volts on receive.  When
> the key is pressed, R5 is bypassed and full 120V B+
> is applied to the tube.  I'm getting almost exactly 1W output
> using an external tank coil that is link-coupled to the antenna.
> I mis-typed that on transmit, the OSC was shifting higher;
> it is in fact shifting lower by about 15-18 KC.
> I must assume this isn't a problem with a VT-1 since
> these sets remained in service many years and could not
> have functioned like this.
> I intend to go forward with your suggestion of trying
> a 6C4 in this stage.  We'll see how it goes.
>
> 73 Dave AB5S
>
>
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