DX100B Restoration

[Brian Carling]

THE PLOT THICKENS.

Now I KNOW something is UP with this 12BY7 xtal osc!
I was looking at the wrong 12BY7 stage.
This osc is out in th eopen, nice and easy to get to.
First thing I see is someone was trying hard to repair it before.
They put a JUMPER wire acorss the 27 K screen grid resistor
Bzzzzzzzzzzzzt! Wrong!

She's getting plate and screen voltage but I bet I find some
other error here....


On 2 Mar 2005 at 15:32, Brian Carling wrote:
 
> Hey this sounds GREAT Jim...
> 
> I am keen to try most if not ALL of these mods here.
> I dragged the DX100 out of the case today, and so far
> I found that the 12BY7 is good so will start by checking the voltages
> and wiring to the crystal osc. Will look at all the PS voltages too. I
> now have a shopping list to take to the store.
> 
> Will keep you all advised on the progress.
> 
> 73 de AF4K, Bry
> 
> On 2 Mar 2005 at 12:03, K4deejim at aol.com wrote:
> 
> > Brian, I have found the 100B a very rewarding project. This is what
> > I did : Removed the HV rectifiers,installed 6 kVdiodes , SS the bias
> > supply, put PTT in with 6 VDC DPDT in pwr sply area and another in
> > PA grid area for ant transfer and rx mute . Another 115 VAC relay
> > under where 5R4 sockets were to control plate xfnr primary with
> > separate fuse holder in 5R4 vent hole in chassis . All relays were
> > obtained at Skyjunque in W.P. . SSB coax fitting used for RX ant .
> > Use extra 6 vac winding for 6vdc supply . Drop reg 150 to 105 as in
> > Apache VFO . , removed green lens behind VFO dial and change6v lamp
> > to 12v . Change A F .1 bypass caps to 20 mfd, couling caps to ..01 ,
> > !st AF amp grid to 3 meg with 47 k and .01 mfd in series with mic.
> > Put 5k 10W res in series with drive pot to Gnd , puts less load on
> > pot. I hope I gave you some ideas. I find my $ 30 investment very
> > stable and very respectable on the air. Cost of mods not included ,
> > Have fun ! Jim -K4DEE
> > 
> 
> 
> 
> 
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