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Custom build 20watt

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  • #1

    Custom build 20watt

    Hello

    Over the past month or so ive been selling all of my custom built amps that ive made over the past 5 years a few in total
    My ear's are getting bad and i have given up playing in a band.

    anyway I have had a lot of interest on my customs amp and its given me an idea to make a few more and make some extra cash

    I looked in the store room for things to use and found a pair of TX's and about all the parts i need to make up the amp

    I have decided to make one based on a Peavey Classic 20watt
    peavey-classic-20-schematic.pdf

    Ive spent a fair about of time checking and sourcing parts getting prices and doing the maths
    I have already ordered about 10 amps worth of parts like chassis/tx's/Faceplates/bases/tag board
    So ive got a better price and i will make one at a time sell it and make another.

    Anybody got any idea's on my choice of design and any changes they would make. any changes that would put a fancy twist on the amp
    any thoughts at all ??


    Look forward from hearing from you

    BBB
    Tags: None
  • #2
    Sounds like a good choice. Everyone loves those amps and the only complaints are usually about the way the boards are put together or the speakers. So you will not have to deal with either of those shortcomings.
    I'm surprised we never hear of more people building these designs, but then again, there aren't kits or standard aftermarket parts aimed at them.
    Originally posted by Enzo
    I have a sign in my shop that says, "Never think up reasons not to check something."


    ​

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    • #3
      wont be any PCB in mine i do like the sound and im a bassist what do i know. trying to find out about the boost switch on it. if it makes much difference to the sound. if it does i will stick it on a foot switch. Ive made sure the power tx's ( custom made for me ) have enough current for extra 12AX7's so i could upgrade the odd one for a send and return

      BBB

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      • #4
        It's a great design. You could probably simplify it a bit by "Muntzing". The only drawback "I" would consider is that the gain channel probably won't satisfy the uber gain players and most hard rock or blues players have their own preferred boutique pedal or want "power tube overdrive". So why fuss with a channel switcher that falls short of modern standards. Many of the two channel switching type designs from the '90's to now that only do "hard rock" level distortion are considered passé. In this light your chosen design may seem too dated for modern players and too modern for vintage players. "I" might consider sticking with a vintage type design with a boost circuit built in for that "modded" sound. At least then you'll be targeting a specific demographic. IMHE with Dean Markley (who decided to market that kind of amp INSTEAD OF THE ONE I DESIGNED) it's a losing proposition to make an amp that plays the middle role between vintage and modern. It'll be looked at sideways by both groups. His reissue CD amps are really very good. But they don't exactly fly off the shelves.

        A more vintage design would be a little simpler to make and, if marketed correctly, would command the same price. Soon after you could introduce a model with an uber gain channel stacked on top and, with any reputation, people would buy it.
        "Take two placebos, works twice as well." Enzo

        "Now get off my lawn with your silicooties and boom-chucka speakers and computers masquerading as amplifiers" Justin Thomas

        "If you're not interested in opinions and the experience of others, why even start a thread?
        You can't just expect consent." Helmholtz

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        • #5
          The PV Classic 20 is a very cool little amp, but you might also look into the Peavey Bravo. it has a serious fan following, the Cult of Bravo. it is a bit more complex, having channel switching, FX loop, and reverb. You could leave out the reverb of course or the FX loop. But the Bravo is also just a single pair of EL84s like the Classic 20. The Bravo is more like a Classic 30 in the preamp. The Bravo has active EQ on the dirt channel with normal passive on the clean channel.
          Education is what you're left with after you have forgotten what you have learned.

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          • #6
            Well the amp is built. a couple of school boy errors and had to up some of the filter caps.
            All good and working well. Its time to tweek it up
            peavey-classic-20-schematic.pdf
            Question about the Suzpp boost switch. It's working ok, but it there anything you can do yo make slightly better.
            I'm a bassist so i don't really understand what you 6 string pluckers really want, byt to me it sounds weaker than maybe it could be
            BBB

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            • #7
              Hi Guys

              The PV C20 is an interesting circuit and could easily BE a classic at some point. For greatest versatility you should build it as a head, then the player can use whatever speaker(s) he wants to. Medium gain amps are actually the most useful as they are amenable to use with pedals and can provide 70s crunch quite well, with good note articulation.

              The 'boost' is just a mid-shift in the EQ not a gain boost. Usually the shift cap is smaller, like 1nF; here it is 47nF for a more dramatic effect, but still not one of gain.

              The output tubes should have screen-stops added: 1k-1W flame-proofs (metal-oxide).

              Have fun

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