Hello guys, is it possible to still get the owners manual for these amplifiers anymore. i've done a lot of searches but have found very limited info on these amps. any direction or help would be greatly appreciated. thanks, 313
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d&a mdx-200 or pdx-400 owners manual
- Thread starter 313inthegarden
- Start date
I've seen both of these. ken emailed me back and he only has the schematic and qsl.net only has the pics. any other suggestions? thanks, 313
Best I can recall, the only "manual" that D&A sent with these was a single 8x10 page of conversion instructions. How to convert it from a crystal-controlled ham CW transmitter back to the linear it was meant to be.
This was a dodge to get around the FCC rules banning CB linears.
Never have seen anything more than the schematic for it.
73
This was a dodge to get around the FCC rules banning CB linears.
Never have seen anything more than the schematic for it.
73
BJ radionut
Supporting Member and 6m addict
https://www.eham.net/ehamforum/smf/index.php?topic=20713.5;wap2
Info you might glance at in regards to sweep tube usage on 6m.
I had a drawing for a pair of 6LQ6's on 6m but for life of me can't find it. One thing to remember is the output of say a 6LQ6 on 10 meters, using the same tube on 6m output will be reduced by 30%-50%...so a pair of them on 6m is pushing it at 200w PEP...the Knightkit T175 amplifier used that very circuit...That manual should be on-line.
I think by the time you spend converting the drive circuit(or scrapping it! MHO) plus modifying the final stage of that D&A amp to 6m...your reaching for the stars IMHO.
Stability is going to be a real issue, let alone time invested for any reasonable output.
Best sell it as-is and use $$ for a true 6m amplifier. The power supply could be used with mods for say a Russian GI7B tube or the old 4cx250b in GG, and could work well, just to many things would need to be addressed with amp as-is to make it play.
Good Luck
All the Best
Gary
Info you might glance at in regards to sweep tube usage on 6m.
I had a drawing for a pair of 6LQ6's on 6m but for life of me can't find it. One thing to remember is the output of say a 6LQ6 on 10 meters, using the same tube on 6m output will be reduced by 30%-50%...so a pair of them on 6m is pushing it at 200w PEP...the Knightkit T175 amplifier used that very circuit...That manual should be on-line.
I think by the time you spend converting the drive circuit(or scrapping it! MHO) plus modifying the final stage of that D&A amp to 6m...your reaching for the stars IMHO.
Stability is going to be a real issue, let alone time invested for any reasonable output.
Best sell it as-is and use $$ for a true 6m amplifier. The power supply could be used with mods for say a Russian GI7B tube or the old 4cx250b in GG, and could work well, just to many things would need to be addressed with amp as-is to make it play.
Good Luck
All the Best
Gary
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