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Going to a stud mount final is also and interesting idea. There was a MRF450a as well as MRF455a I even have both. The 450a has allot of gain if I remember correctly. There will be pictures added to this soonish

This fella talking about coupling the audio AC signal to the 12vdc feeding the final is absolutely correct. The cap mentioned blocks DC voltage from the output stage (pin) from the audio amplifier IC and the low value filter choke presents a higher impedance to the audio signal then the final...

Having or using very well matched fets is the secret. RM has figured out how to inspect the anus on little fets and group them together to achieve stability. Otherwise, if a guy wants to build himself a linear in this power class. He keeps the RF circuit as simple and reliable as possible...

The reason he doesn't junk his videos up with comments is because it would look like this. Being in business myself but the audio world, I know what it's like to have complete idiots for customers. But idiots have money, so those of us who 'Can' do.. Separating a man from his dollars...

I never knew Ameritron used "PP100" outputs until now. But I do know Ameritron is owned by "MFJ" now and that pretty much explains it all. Take their most expensive amps... a 1 year warranty.. So they are not expecting, they are hoping your 5 thousand dollar linear lasts a year. I get a 6...

Should never overlook the antenna system on top of everything. The 2879c parts are wholey different from the 2879. So part values are different. Really only matters if you rely on a service tech that knows what values go where but not why. Only say that because people who can't build or fix...

Looking at the 3rd picture you posted. With all the finals in it. The 6th from the left, top row. You can see the 10 ohm went poof and that stage's combiner (of 4 finals total, before the final or last combiner) 100 ohm is roasted. When a final takes a dump like this, you now effectively have...

Man you are so right. Better to get someone farther along or into the hobby to begin with then to do battle with the soulless chomchompskies

I just passed on a new, but blown up Texas Star 500 amp with crummy DEI finals in it the other day stupid cheap. If I can go back around lunch today and pick it up, I'll take these.

I'm working on squaring away a Malaysian made 148gtl. It had been hacked on like most. I removed all the shmoo that had gone into the rig. Now this is key. The radio worked when first on the bench, so the real question is what did I do or have caps taken a dump on me after a few hours of...