Topband: DX-100 adventure contiunued

[Keith Jillings (G3OIT)]

>> The DX-100 High voltage is choke input by design. I changed the low
>> voltage supply to choke input as well and the rf stages are behaving
>> very nicely with that. I already think my line is "high" and I'll take
>> readings various times as you have suggested. Light bulbs don't seem to
>> last very long here, either.
>>
>> Tom asked about bleeder current. I didn't try to measure it but I
>> watched the high voltage decay to zero in a very few seconds when I
>> switched it off with no 6146s in the sockets.


In my (very distant) youth I came by a DX-100 that had been built from 
kit by a local, who could never get it to work.  I spent a few 
interesting weekends studying the circuit and the construction, and then 
set to with a hot soldering iron and got it working.  I used it as my 
one and only TX for a fair few years, modifying it to do this and that 
as I went along.

Mine was fed from 230 volt mains, and as I recall the HV was in the 
region of 900 volts off-load, sagging quite a bit on-load.  I never 
worried about it, and the PA valves remained happy throughout.  The 
electrolytics didn't go bang either, but they were very much younger in 
those days.

I eventually sold it to a local dealer and put my pocket money to it to 
buy an FT101E which I still have and use with my VHF and UHF transverters.


73

Keith
G3OIT