[Boatanchors] VFO To Transmitter Question

[Drew P.]

Scott wrote:
 
> I have a 1934 Gross CP-100 transmitter that works
> fabulously... with crystals. I have been unable to get a VFO
> to work with it so I''m wondering if someone here has some
> insight. The oscillator looks like a Pierce with the crystal
> and a 10K resistor in parallel from grid to ground. The tube
> is a type 47. 
> 
> The 47 drives a 210 buffer which drives an 838. 
> 
> It runs FB with a standard FT-243 crystal. I have been
> trying to interface a Millen Vari-Arm vfo with no luck. In
> desperation I tried an Eico 755 as well. In each case the
> oscillator runs at a different frequency, nothing close to
> where the vfo is running, crappy signal besides. I can't
> figure out what the problem is. 

(snipped)

It does not sound like it has a pierce oscillator, which in classical form has the crystal connected between grid and plate.

I am not familiar with the Gross CP-100, but if it actually has a Pierce oscillator, then you cannot feed the VFO signal into the crystal socket.  You would need to connect the VFO between grid and ground.

Drew