Apache TX-1 question

[Garey Barrell]

I have a DX-100B that came to me with a similar problem.

I bought it at a hamfest with a "works fine on two bands" claim, and 
since it looked like brand new I decided to take a chance.  It was in 
fact brand new inside as well

When I got it home I found that it had about half power on two bands.  
After excavating my way inside the VFO (those of you familiar with the 
DX-100B know what I mean) I found that the bandswitch wafer had been 
broken in half and "sorta" reglued with the old brown Duco cement.  Of 
course it was a "custom" wafer, but a standard wafer from Ack Radio 
(cross-wired with a jumper or two) replaced the original just fine. 

Upon further investigation, I found one pin of one octal socket had been 
filled with solder by the overenthusiastic builder, preventing one 6146 
from seating in it's socket.  A little operation with a SoldaPult took 
care of that problem.

I have often thought about the poor soul who built it, after investing 
what was probably a week's pay (for an adult in 1957) in the kit, 
breaking the VFO wafer and gluing it back together, finishing the kit 
and turning it on.  The VFO bandswitch probably fell apart the first 
time he tried it.  Then when it only put out about half power he 
probably pushed to the back of a closet and left it!  Quite likely left 
Ham Radio the same day!!!

73, Garey - K4OAH
Atlanta

Drake 2-B, 4-B & C-Line Service Supplement CDs
<www.k4oah.com>



Kenneth G. Gordon wrote:
> On 4 Jan 2007 at 10:41, Robert & Linda McGraw (K4TAX) wrote:
>
>   
>> Conclusion, with one tube in the left socket, plate current 125 ma,  3
>> ma of grid current and 75 watts output.  Move the tube to the right
>> socket and na da, nothing, no grid current, no plate current no
>> output.
>>     
>
> It sounds to me as though you have either 1) a bad tube socket, or 2) 
> bad solder joints at the tube socked, or 3) a bad or broken wire at the 
> tube socket.
>
> The two tubes are in parallel: therefore ALL connections at one tube 
> socket are simply duplicated at the other one.
>
> If one tube works, and the other doesn't, then the problem is bad wiring 
> or a bad socket.
>
> Tube sockets can have loose "clamps" in them. I.e., the socket holes 
> can spread so that they don't grip the pins. I have also seen at least 
> one tube socket in which the "grips" in the socket were broken so 
> although from outside it LOOKED like they were all in one piece, in 
> point of fact there was an open circuit between where the wires were 
> soldered to the bottom connection of the socket and the tube pin.
>
> Ken Gordon W7EKB
>
>   

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