[Heath] DX40

[Kenneth G. Gordon]

On 14 May 2018 at 14:43, Bill via Heath wrote:

> 
> Just acquired a DX 40, not working (of course).
> 
> Pretty clean inside, but at least 1 obvious problem, the plate connection at the top of the tube is 
> broken.

Do you mean the top-cap on the tube is broken off? Or just the wire to the plate connector?

If it is the tube, toss it and get another one.

> The other (possible) problem is capacitor 23-11 (0.1 uf, 600v) has been replaced with a 30uf cp.
> 
> Was this a beneficial mod or an error?

Hmmm....my manual does not show capacitor 23-11 in the parts list, nor a capacitor of 0.1 
uF, 600V anywhere. My parts list does show a 2 MF 200 V capacitor part number 23-17. 

Maybe yours was a later factory mod. Where does this appear? If it is in the modulator area, 
it may be the timing capacitor for the controlled carrier modulation system.

If it is, I would think that 30 uF is much too large. There are some enhancements for 
controlled-carrier modulation on an AM site. Perhaps you will find something useful there.

My first transmitter was a DX-35. I have two now, and a pair of DX-40s. If I can help, holler.

Ken W7EKB

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