[heathkit-yahoo] Re: DX-60 oscillator circuit

[Jim F.]

Hi Brian,
  This fall I bought a nice Johnson Viking Challenger ($50). At home I
  looked at the wiring....what a rat's nest underneath...with unsoldered and bad connections.
  I poked around under tha hood for a few days re-soldering, re-wiring, re-routing and replaced the filters and behold;  "IT LIVES"..  I wonder if this puppy ever saw any use..
   
  Now I have an AT-1 (bad mica cap) and an Adventurer (missing solder).
   
  Makes one wonder how many hopeful kids built these rigs that didn't work
  and then gave up ham radio in frustration....
   
  I built my first rig, and Eldico TR-75 at 15, and it worked great...There were no other hams around to check it out for me so I got   V E R Y  lucky...
   
  All these thoughts bring me back to my old Novice days (1954)
   
  Happy New Year to all, and CU today, 
   
  (New Years day) on  Silent Key Night  (SKN).....  7.040 MHz  
   
  Jim - W1FMR.......Ex WN1FMR
   
   
   
  

Brian Carling <bcarling at cfl.rr.com> wrote:
  On 31 Dec 2005 at 5:29, Jim F. wrote:

> A 15pF mica was unsoldered and a 20pf tacked into it's place. 
> This brought the oscillator grid current up nicely with no crystal overheating. 
> The problem was somehow solved. 
> The removed 15pF capacitor with the correctly colored dots 
> actually measured 458pF and been this way from day one. 
> No wonder the little transmitter showed very little use. 
> (Darn that extra hole in the faceplate !) 
> A good lesson here.... 
> Jim Fitton - W1FMR 

Interesting Jim. Things happen - like the 33 ohm resistor someone 
put in thie 6DE7 mod stage here. This rig has never been on the air 
on AM and MAY have never been on the air on CW either by the 
looks of it!

Funny thing is, there is no modulation either. I think it may have a 
bad tube, so am going to test the 12AX7 and 6DE7 before I get far 
into more signal tracing. I know my mic is good, but the voltages 
don't look quite right on the three audio stages here...

Oscillator is working nicely now though!




  


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