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I am about to start my first amp build.

Discussion in 'Shock Brother's DIY Amps' started by Ironwolf, Sep 5, 2020.

  1. Ironwolf

    Ironwolf Poster Extraordinaire Gold Supporter

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    I'll be building the '62 Brit-Plex from Stewac. I've read through the instruction manual several times and read the reviews with notes from others who have built the kit. The kit and other items I ordered will arrive here Tuesday.

    My research shows that it is a clone of an early 1966 JTM45, after the change to EL34 valves, but before the change to a solid state rectifier.

    I'm looking forward to starting the project. It shouldn't take to long, at least in terms of total man-hours.
     
    Last edited: Sep 5, 2020
  2. Switchy

    Switchy Tele-Afflicted

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    I don't know what one usually says when you start a cool project like this, so Good Luck and have Fun!
     
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  3. fishermike

    fishermike Tele-Meister

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    This, and be safe!
     
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  4. 8barlouie

    8barlouie Friend of Leo's Gold Supporter

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    May the Schwartz be with you. I’m watching this thread because I’ve thought about going into amp building/repair.
     
  5. Bendyha

    Bendyha Friend of Leo's Silver Supporter

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    ...which means the idea of building the next one won't be far off.
     
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  6. sds1

    sds1 Tele-Afflicted

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    I wonder what the record is for post count at commencement of first build...
     
  7. Lowerleftcoast

    Lowerleftcoast Friend of Leo's

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    Are you experienced with electronics? The reason I ask is I took a quick look at *the kit*. The wiring examples should be updated for safety and lower noise.

    You should look at the Rob Robinette sites for a better way to wire in the power cord. He also has some ground schemes that are preferable to *the kit*. Check out the "5F6A mods" pages and the "Marshall" pages to glean more info to better your brit-plex.

    I am not suggesting any *mods* just better ways to wire the amp for safety and low noise.

    Looking forward to this build.:cool:
     
  8. koolaide

    koolaide Tele-Afflicted

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    You got this....
    Just be safe and don't forget to discharge those caps, and if you don't have one build a lightbulb current limiter 1st.

    Peace,
    Jim
     
  9. awasson

    awasson Poster Extraordinaire Gold Supporter

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    Very cool looking amp. I’ll be following along with interest.
     
  10. dan40

    dan40 Tele-Afflicted

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    Stewmac sells the Mojotone kit, but unlike Mojotone, they include a full set of instructions instead of a simple layout. The only issue is they still follow the old layouts instead of a more modern, safer wiring layout. As Lowerleftcoast mentioned, there are better ways to wire up the power supply which will meet today's safety standards.

    Take your time with the build and you will have a great amp when you get finished. Rushing through the build will only lead to wiring and soldering mistakes that can take many hours to troubleshoot. Meter every resistor before installing so you don't accidentally install the wrong value. Take your time with the heater wiring as it can be a bit tedious trying to twist them properly and route them correctly. Also make sure that you have a decent soldering iron that has enough wattage to properly solder turrets. They can be a bit hard to do properly with a small iron. Also make sure to look at lot's of original amps for the proper wire placement and layout. There are several critical wires that must be done properly if you want a nice quiet amp when you're finished. Don't forget about building a light bulb limiter for the first start up. Only takes a few dollars in parts but it can save you an expensive power transformer should there be a short somewhere.
     
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  11. LOSTVENTURE

    LOSTVENTURE Tele-Afflicted

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    Be sure that your dental records are current. It could be helpfull with identifying the remains.
    Kidding.Good luck !!!
     
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  12. Ironwolf

    Ironwolf Poster Extraordinaire Gold Supporter

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    These are all things I know about. As for experience, I have done maintenance work on guided missiles, nuclear devices/weapons, radar sets, and currently work with smart phones and computers. Been doing this stuff since the '70s.
     
  13. SacDAve

    SacDAve Poster Extraordinaire Silver Supporter

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    well amps aren’t rocket science . It’s all about checking and rechecking , taking your time , safety i’m sure you have that down. The downside another addiction
     
  14. dunehunter

    dunehunter Tele-Holic Double Platinum Supporter

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    Very addictive...
     
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  15. dunehunter

    dunehunter Tele-Holic Double Platinum Supporter

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    Do yourself a favor; along the kit, buy their "cap snuffer". I know, you can "make your own" (been down that road many times now), but just as you are ready to clear the caps again, the wire will break off on your home-made snuffer and then you have to put the amp aside and work on the tool, (now muttering to self). It's not cheap, but it's well made and worth the money in terms of time spent.
     
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  16. dunehunter

    dunehunter Tele-Holic Double Platinum Supporter

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    Oh, and good luck, and take LOTS of pictures of your progress!
     
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  17. David Barnett

    David Barnett Doctor of Teleocity

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    Fun!
     
  18. alathIN

    alathIN Tele-Holic

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    Take your time, don't rush.

    I have the same issue. I keep trying to tell myself "this is a hobby that I enjoy, not an unpleasant job I'm trying to get done as fast as possible."

    It's a fun hobby and you will learn a lot.
    Plus get a very cool amp when done.
     
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  19. Ironwolf

    Ironwolf Poster Extraordinaire Gold Supporter

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    The kit has arrived. Unfortunately, It's quite late after a very long and tiring day at work, so I won't open and inventory it until at least tomorrow.

    Kit arrives.JPG
     
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  20. awasson

    awasson Poster Extraordinaire Gold Supporter

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    Awesome! I’m strapped in and stoked to see how this comes together.
     
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