Sentimental Homebrew Tuned Circuit 1 Pill Amplifier Repair - [Transformerless Amp]

Hey can you make me a 2 pill ssb only amp for my ICOM 7300. It is a 100 watt radio. I would like to run it with 100 watts into the amp is that possible? Thank you sir!

Flange mount.
I have wanted to build a tuned circuit on a single device. Maybe one of these new HG 454 would be cool as a little modulator.

86! I was already married with a kid on the way. 😳

73’s, TWO BEAUTIES RITE THERE. 🙃🙃

Good work. Thanks for the teaching !

That a neat kit amp. Hard to remember back that far. There was amp kits like that in HAM magazine . That bord may be photo etched . I was doing that in the 80's from school projects. I still have a bunch of stud mount transistors. MRF 449/450/454/455/492/421 and some others. I got a nice old amp with 4 -MRF 453A pills. They used same input transformers and out put for the splitter and combiner. Is AB bias with 1N4997 press into heat sink. no pre amp. has filter board. SSB delay . got it on trade. 3 pole relay hard to find. replaced mica caps . working great. easy does 225 watt PEP on SSB. now that tuned circuit 1 pill has small band of operation. That may have ben 10 meters . why the coils were off. I had a Palomar 50 with MRF 450A come threw . had to tune and play with coil to work 11 meters. If you use ferrite cores it will brood band better but drop the power a bit. you can use a splitter as a input transformer. just re do winding. the 2 windings that come together go to ground. in a splitter it's the input. one winding is input outher goes threw cap to base. just match 50 ohm to transistor. you can do same for out put but heaver wire . collector current. when you use push-pull transformers for 2 pills on 1 pill you loose some RF from un used side. I sent pic of 50V MOSFET . That does 100 watts RMS from 10 to 11 meters. That 4 pill stud mount amp has DSS on it and has gold big heat sink . also has illegal for CB use. on it. it's on my RCI 2950 from 1990 has dual finals and LCD display. My newer 2950DX has blue LED display and goes 24.8 to 32 Mhz. the old one only 26 to 29.999 mhz. The new one has FET's output. does way more power but turned it way down. 1/2 to 10 watt dead key AM/FM 4 to 20 PEP SSB. that how I set my range of power. 73's

What a cool looking little amp! I would have been lost as a Thanksgiving Turkey on that repair. I wonder how it ever worked at all without the keying circuit?

That cool.....I once saw a real davemade 3 pill ...not a 1x2...but a a real 3pill...just 3 2879s no transformers. Just tuned Circuit something like your video...

I have a tri also works well

I thought you were older buddy. When u were born I was a full grown man. My first amplifier was given to me in 79-80.
In 1986 I got my first davemade from dave.

Hey on a 6pill of hgs .. the combiner went up in smoke why would that happen and what watt and ohms do u use for the combiner

New Old Stock might look pretty young but it's just back dated. Yeah.

Good video gatekeeper ! Enjoyed it. Now... how do we get a hold of you for an amp repair.

You young a spring chicken. In 86 I was 15. Just picking bud.

I built 1 similar to it in 73', it also had a relay to key it from within. I have lost it know. Do you have a schematic for it?
Or know of a book that would have one?

I can't find a MRF455A, but I CAN find a MRF455. Even at a parts search site it could not be found! Don't know the difference.

I have a Skywave DX250 that is a tuned circuit narrow band single MRF454 that will give me 200w RMS out with 10w RMS in on AM. It gives me 280w PEP on SSB with far less than it's max input of 40w PEP. That is at 13.8 volts with tiny 12 gauge power wire. That one is only good on 26Mhz-28Mhz. If I want to talk on all of HF+6m I have to step up to a transformer design that is broad band which means at least a 2 pill to make it worthwhile!

Very Cool,
Tec. Thank you.
G K.

Wow, I have never seen an amp like that one. But it is not too bad at all on power.