Hi to all, I have taken on a project that has been bugging me for a bit. I have a MLA2500 that I picked up that has been retrofitted with a pair of 3cx800 intending to have a transportable amp. From
Hi Chris, 2700 ohms plate load R seems a bit high. What plate voltage and current was that figure based on? 73, Gerald K5GW In a message dated 12/30/2012 2:49:54 P.M. Central Standard Time, c_miller_
What program did you use to calculate values? Carl KM1H Hi to all, I have taken on a project that has been bugging me for a bit. I have a MLA2500 that I picked up that has been retrofitted with a pai
Before I go too much further, a little framing of my background with tubes. Basically, I have very limited formal training with them directly. Any work has been repairing to bring back to schematic w
I tried a couple of programs to see if the values in the existing circuit were even in the right area. PiEl seemed to be the easiest to play with the values to get a result that seemed to match what
The amp came already modified with the 3cx800s. It was done up by W4EMF. One of my EBay finds that has found my bench. Yes that is the technique that I was using. I was using a miniVNA box, but that
In my former past as a hired gun CW contest op I seem to remember the MLA-2500 was capable of 1,200W out with ease. Assuming class AB operation that means the power supply was capable of 2.5 to 3.0 k
One 3CX800A7 is equivalent to a pair of 8874/8875's in power and load line. Since the MLA PS wont support a pair of them just remove one and try again with the circuit as built. GM3SEK's software is
Pretty sure I have it. I pulled as much info on the various conversions to see what the history of the changes were. Mainly was looking for any significant differences to see if maybe there was a pre
The MLA-2500 runs a pair off 8875's rated at 300W Pd each. As designed it could do 1200W SSB PEP OUTPUT when driven hard but it is a stretch for CW, especially in a contest but when tubes were cheap,
OK now I will drop my proverbal pants the rest the way, I distinctly remember the station owner loaded up his his FT901 for 100W drive and then loading up his MLA-2500 for 1800W out on his watt meter
OK now I will drop my proverbal pants the rest the way, I distinctly remember the station owner loaded up his his FT901 for 100W drive and then loading up his MLA-2500 for 1800W out on his watt mete
There is a good example of a lying watt meter. Doug "Think of all the ways you can hurt yourself laughing." --Original Message-- OK now I will drop my proverbal pants the rest the way, I distinctly r
...or running into a very high SWR. I can show 1800 watts output from my SB-220 if the load is wacky enough. 73, Pete N4ZR Check out the Reverse Beacon Network at http://reversebeacon.net, blog at re