Command Technologies 2500 amp aka Dedicated RF aka AN Wireless

[WS8RM]

Now, man to man, I assure you that any 'mess' was inherited by me ......Meanwhile, I'm working as best I can with those who do have     "legitimate product issues"

Dan
[/quote]

I was thinking that you did not "INHERIT" you bought! (the Command line) -- Just what WOULD BE a legitimate product issue that you WOULD be interested in?

WS8RM

[KK3AN]

Wayne, you're twisting words around again & trying to turn this into a game.

Dan Simmonds

[K6AER]

Dan,

When you have time call me. 303 246-3518

Mike - K6AER

[ZENKI]

Hopefully these new Command amplifiers will have filament voltage adjustment on them.

Voltages taps on the primaries of the transformers for line voltages as great  250 volts would also be of benefit.  These days none of the providers care what the line voltage rises too,

If these amps are going to be good as  the designer says they gonna be, I will buy one only because it uses clean Eimac Triodes and not Russian Junk tubes.

[KK3AN]

Coincidentally - yes. I'm in the middle of sourcing a filament transformer (perhaps a toroidal) that will have taps from 100v to 250v, and our intent is to auto-sense the primary AC.

I know this problem all too well. At my rural QTH, I've personally measured my own mains voltage anywhere from 214 up to 248. There's no rhyme or reason for this incredible variance that I can identify.

Dan Simmonds

[ZENKI]

Great news, your amps will be the first amateur radio amplifiers that has this feature.

Coincidentally - yes. I'm in the middle of sourcing a filament transformer (perhaps a toroidal) that will have taps from 100v to 250v, and our intent is to auto-sense the primary AC.

I know this problem all too well. At my rural QTH, I've personally measured my own mains voltage anywhere from 214 up to 248. There's no rhyme or reason for this incredible variance that I can identify.

Dan Simmonds

[NM3G]

Coincidentally - yes. I'm in the middle of sourcing a filament transformer (perhaps a toroidal) that will have taps from 100v to 250v, and our intent is to auto-sense the primary AC.

Dan,

Just a suggestion ... rather than using an EI Iron-core transformer, why not use a switching power supply with current and voltage regulation, as well as current monitoring. With multiple tubes (or with tubes with dual filaments), knowing the current is down from nominal certainly enables quick troubleshooting. With regard to voltage monitoring, measuring the voltage at the tube socket pins with a pair of sense wires ensures I^2 losses are canceled, and the filaments remain at a constant, regulated voltage regardless of the line input voltage (well ... for the nitpickers, as long as the input voltage is within the range of modern switchers). The power supply will be lighter as well.

Note ... this is the arrangement I've seen on all sorts of different tube-based MRI amplifiers, including the new ones that have just come out in the last 5 years.

73,

Rick
NM3G

[KK3AN]

Rick,

Honestly, Don and I feel that's an excellent idea. We are going to investigate the switching supply more tomorrow. We've already located one today that could work with all amps (1, 2 and 3 tubes).

73, Dan