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Help decide what amp to build.

Discussion in 'Shock Brother's DIY Amps' started by Grig15, Jun 24, 2017.

  1. Grig15

    Grig15 TDPRI Member

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    hello! My friend have nice but awful sounding 15W amp. And Im thinking to take of all parts and build new one from it. But as Im new to this, dont know what amp to choose that will satisfy me, and sound nice! I want it to have gain, middle, treble, and bass knobs on it, and How it sound clean is most important. So we can plug pedals on that and recive nice sound! What do you think? Any not expensive valve or SS models suggestion????
     

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  2. VintageSG

    VintageSG Friend of Leo's Ad Free Member

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    I wouldn't bother. Try removing the back cover if it's a closed back cab. That may help remove the nasty boxiness in the sound. If it does improve things, modify the back panel to make it a half-open cab. By the time you've sourced all the components to build a decent amplifier, you're still left with an 8" cheap speaker. Add in the cost of replacing the speaker and you'd be better off buying something better in the first place.
    If you can find a second hand 10" or 12" speaker at a reasonable price, build a cab for the speaker and convert it to a head unit if you want to build something.
    I found some demos of the SG300r on Youtube and it sounds like there is a reasonable sounding clean amp struggling to get out. The 'gain' sounds were typical of all I find offensive in cheap solid state combos.
    All in, I'd look for a second hand Orange 35 Watt combo or similar.
    Did you buy a Vox?
     
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  3. Super Locrian

    Super Locrian Tele-Meister

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    Personally I would recommend against something like this as a first amp building project. Better to start with a well documented amp kit, or find a used Epiphone Valve junior to mod (lots of online how-to's for that). Make sure to check out Rob Robinette's website, there is a lot of useful info there.
     
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  4. robrob

    robrob Poster Extraordinaire Ad Free Member

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    A swap to a quality speaker might help, but it's difficult to know what speaker will work with a relatively unknown amp.
     
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  5. Grig15

    Grig15 TDPRI Member

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    No I didn't bought vox, I spent all my money on guitar)

    I looked at back! It has semi opened. Maybe replacing with good speaker will help.
     

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  6. Grig15

    Grig15 TDPRI Member

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    Thank you! Watched Rob Robinets website! It is great, thinking to built some fender champ...
     
  7. Grig15

    Grig15 TDPRI Member

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    As far as I know it is marshall china copy, will look inside and write results...
     
  8. VintageSG

    VintageSG Friend of Leo's Ad Free Member

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    I found another demo. This one doesn't sound so boxy, but oy vey, that gain channel sounds bad. I suspect in the first demo I found, they had the amp very close to a wall. There are a few seconds of clean at the beginning.

    I'd be reluctant to spend too much on a replacement speaker. A Celestion Eight/15 or Jensen Mod 80-20 would be about as high as I'd personally go. Both would be an improvement on what's in there to begin with, but don't expect miracles. What's available locally?
     
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  9. Grig15

    Grig15 TDPRI Member

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    Thank you for your research.
    Locally it is hard to find any quality amp speakers. Only option it is to get speaker from ebay or another country by airmail. But good thing is that we are post soviet country and all tube transistors russian analogs and vintage radio detals is very very cheap.
    And one thing, I found some vintage amp fender rad for 120$. But the problem is that it is us made 110v and I must convert voltage, + I dont know nothing about it.
     

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  10. VintageSG

    VintageSG Friend of Leo's Ad Free Member

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    I'd never heard of the Fender RAD, so I looked it up. Cleans, it doesn't seem any better than what you have. You'd be spending $120 to get pretty much what you have now + you may need to change out the transformer. Have a look here.
    https://elektrotanya.com/fender_r.a.d.amplifier.pdf/download.html
    Page 3 shows the transformer. I may be misreading it, but it looks like export models can be reconfigured to a range of voltages by moving leads around, while the domestic model is a fixed voltage device.
    I wouldn't buy in the hope it can be internally reconfigured for proper voltages.


    Try and get your hands on some old Soviet radios or radiogrammes and see what you can make from them.
     
  11. Grig15

    Grig15 TDPRI Member

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    Thank you again for your research. Now Im thinking about building fender 5e1 or 5e3, with soviet parts. Don't know how it will sound, but it is very interesting. There are many documentation available for that amp.
     
  12. String Tree

    String Tree Doctor of Teleocity Ad Free Member

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    You should build ME a Princeton Reverb.

    Just sayin'.

    Just because you don't know how it will sound, is no reason not to build it.
    It might just surprise you in the best kind of way.
     
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  13. Henry

    Henry Tele-Holic

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    Building a tube amp is a hugely satisfying adventure Grig. You'll need to organised and well prepared. Find the schematic you want to build and YT videos of someone else going through the process. You also need to source a complete parts list and a layout diagram. A schematic is a fine thing for coming to grips with the electronic theory but putting components together effectively is a whole different catastrophe. I bought a kit but that doesn't sound like it's going to be an option for you.
    Can you solder, do you have a good iron/station? If not, buy one and you should consider doing a simpler project first. Much better to burn a few components in a trial run than something you've invested a lot of time and money in. You will also discover the joys of troubleshooting, an art in itself. Most of all be patient, especially when you're attempting a tube amp, enthusiasm in this case can get you killed which would be a pity, we're all fond of life 'round here.
    Good luck.
     
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  14. Grig15

    Grig15 TDPRI Member

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    Yes!!! The hope that it will surprise me best kind of way making me do this!!!
     
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  15. Grig15

    Grig15 TDPRI Member

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    Yes I know that layout helping very much, I can't do without layout. Have good soldering station too, built some pedals in past, but know nothing about tubes. But my father is great specialist for that, especially than things coming about that kind of parts (vintage transistors and capacitors). He is interested too very much and with his help I can learn and build. The problem that he is very old school and hates layouts. For me layout is great thing, but he always saying take that kids painting away and bring me normal schematic. Also we having some conflicts about parts, I want to buy exactly same part, but he saying no take this soviet unknown resistor or capacitor it will be same, but can't find something written on it))) want to buy some speaker, but he nooo, take that oval shaped speaker from old sony audio system ))) and finaly he wants with hands and some wire build transformer)
     
  16. Henry

    Henry Tele-Holic

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    You have to respect your parents even when they're wrong! It's interesting that your father disdains the layouts and insists on sticking to the schematic. That suggests to me there is knowledge that will be useful to you. The parts are important but not necessarily critical. The resistance and capacitance values are important but why don't you try to build your amp with your father's help? Get the electronics working and then spend a bit of money on a decent speaker? Who knows, you might teach your father something
     
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  17. Grig15

    Grig15 TDPRI Member

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    Nooo, understand me right, Im not disrespectful. My knowledge is far away from fathers. I can't build tube amp without his help, sure will be victim of electrical shock))) Im just telling about our little conflicts. I like that, it is more interesting. You are right, If we work together, who knows maybe it will be awesome product!
     
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  18. robrob

    robrob Poster Extraordinaire Ad Free Member

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    Because of your pedal building experience and your father's help the 5E3 Deluxe or Marshall 18 Watt would be a good first build for you.
     
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  19. Grig15

    Grig15 TDPRI Member

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    OH thank you for such a great job, materials from your website helped me very much!!! Preparing to start soviet version of 5e3 :D
     
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  20. King Fan

    King Fan Poster Extraordinaire Ad Free Member

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    Some Soviet and ex-soviet-zone tubes and parts are very well regarded. Enjoy your research, planning, and building!
     
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