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Amp build

Discussion in 'Amplifiers' started by BammBamm, Oct 14, 2018.

  1. BammBamm

    BammBamm Instigators ...173 on the southside.

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    Its getting to be that time of year that I need inside things to do. I currently run a 980 ssb into a RM 203 amp but like everyone else I want more. I could buy an amp but I think it would be fun to build my own. I have plans on a dvd and I’m thinking of a 1x 4 and hoping for maybe 350-400 Watts AM and the same or more on ssb. I have heard the amp must be tuned for frequency after build but I have no clue how to do this? I am also trying to understand baising but can’t seem to find much information. I know many will say to buy an amp but I’m looking for a project. Thanks


     
    Shadetree Mechanic likes this.

  2. sp5it

    sp5it Master of puppets

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    After reading I have one conclusion, buy an amp. I doubt you can diy.
    Mike
     
  3. Shadetree Mechanic

    Shadetree Mechanic 808 On The North Side of Dover

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    This is where I am on building an amp. Tuned in.
     
  4. 5 X 5

    5 X 5 Member

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    I'd say buy a kit. Only kits I found with quick search are higher frequencies. Lots of step by step videos with parts lists/links. Start ordering parts and figure out bias and tune when you get there...
     
  5. jon666

    jon666 Sr. Member

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    by the time you buy all the parts your going to need
    it would be cheaper to by one pre made
     
    Tallman, rabbiporkchop and sp5it like this.
  6. Dmans

    Dmans Well-Known Member

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    BammBamm,
    I get it.
    Anybody can buy an amp, but that's not the point, is it? Maybe start with a sad old DOG of an amp, rehab it, trade it, shelve it, smash it whatever! Then move on to a full built from scratch unit.
    Works wonders for the mind when it gets dark outside at 4:30 pm!

    Good Luck!

    73's
    David
     
  7. Hurricane145

    Hurricane145 Active Member

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    Perhaps cheaper by a long shot as well.
    Chasing down decent parts can be a lot of effort and cost with shipping costs added in. There are also perhaps special tools you may need you may never use again. Nibbler tool, Dremel tool etc.
    I built a small amplifier for 6 meters once with an MRF492 transistor. It was from plans in QST magazine. The biggest problem was finding a suitable heat sink but it was back in 1982 so no internet to dig through. All finished it was a fun project but not an economical one.
    Probably the bigger the amp, the less economical it will be.
     
  8. nomadradio

    nomadradio Analog Retentive

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    If you want a project, I recommend "KISS".

    Keep it simple, simple.

    An amplifier with a built-in driver will be more of a challenge. If your interest is in sideband, you'll find that the maximum power that still sounds good is a bit less than the same amplifier can deliver in AM mode.

    You just can't drive them as hard and still sound good on sideband. Built-in driver designs tend to overdrive the final stage and sound crusty on SSB.

    The basic building block of solid-state amplifiers is two RF transistors in a push-pull circuit. That's where I would start.

    Check out Lou Franklin's "Tri Power" design.

    http://www.cbcintl.com/tripower.htm

    It's only a set of plans, not a kit. But it will give you a coherent and complete idea what's needed.

    73
     
  9. Handy Andy

    Handy Andy Do Your Research First, Then Decide...

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    Thanks Nomad - I actually had the plans a long time ago, when I had bought his Speech Processor.

    The link, it's the same amp!

    Good learning tool...
     
  10. BammBamm

    BammBamm Instigators ...173 on the southside.

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    A lot of good information and answers and I thank you all. Like it was said in an answer that it’s a want...I mean anyone can buy an amp. I have thought about the expense and I have a full machine shop where I work and they also acid etch pc boards so I have that benefit. Turning an aluminum block into a heat sync and case is not an issue or is soldering or tools such as dremel tool or soldering irons. I did like the thought of buying a non working amp and trying repairs and go from there.
     
    Shadetree Mechanic, 5 X 5 and Dmans like this.
  11. rabbiporkchop

    rabbiporkchop Well-Known Member

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    Why not just buy a blown up Texas Star DX 1600 X and strip it down and rebuild it from scratch?
     
  12. 543_Dallas

    543_Dallas Sr. Member

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    You selling yours?
     
  13. rabbiporkchop

    rabbiporkchop Well-Known Member

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    Not in this lifetime.
     
  14. TheRealPorkchop

    TheRealPorkchop Certified Sith Pimp

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    0D06ED36-9C2B-44DE-9A75-B68BBF3251A4.gif
     
    Chevboy0167 and Handy Andy like this.

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