PRS Custom 20

Discussion in 'Amplifiers' started by godwentpunk, Dec 31, 2019.

  1. godwentpunk

    godwentpunk New Member

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    I recently picked up playing this combo again after playing my Marshall JVM combo over the last year. I noticed that the PRS sounded a little thin and boxy (almost solid state like) on the lead channel. For those with this amp, is this typical? or am I in need of new tubes.. I put in a couple different speakers but nothing sounded quite right. I checked the bias and it was set at 28/30 which seems to be typical for this amp, I might push the bias up to 33 but I don't think that will fix the boxy sound. The clean channel sounds much better, but it still sounds like it's holding back. The low end on the amp also feels like it's missing something which might be the root cause of things. I am playing a little louder than bedroom volumes but certainly not band levels.

    Or is it just that my ears are now Marshall trained?? but over all of the combos I have, this amp definitely sounds like something might be going on.

    Any feedback will be welcomed.

    thanks!

    joe...
     
  2. WEDGE

    WEDGE Zombie five, DFZ

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    I had one, great amp but it’s not a Marshall. Also when in doubt I throw new preamp tubes in, they are relatively cheap and then you’ll know. As for ‘boxy’ it is 20 watts in a small 1x12 cab and won’t thump like a Marshall, but I liked the gain side of the amp, just wasn’t saturated enough for my taste.
     
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  3. Herr Squid

    Herr Squid I was severely impressed

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    How far are you turning it up? The master volume on the lead channel needs to be up above 9:00 for that amp to really sound good.
     
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  4. LSchefman

    LSchefman Hears Tones

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    It’s awfully easy to tell if it’s the power tubes. Try a new pair.

    Preamp tubes last for many years, unlikely they’re your problem, but power tubes will wear out.

    When I was a Two-Rock player, I was advised to change power tubes every six months, give or take. Also Squid makes a good point; PRS amps are usually at their best run with the Master as wide open as you can stand, using the gain control old school, as a volume control.

    I run my single channel PRS amps with the masters up past noon, usually around 2:00.
     
    #4 LSchefman, Jan 1, 2020
    Last edited: Jan 1, 2020
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  5. andy474x

    andy474x Knows the Drill

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    Definitely try new tubes, the lead channel of the Custom amps are anything but “boxy,” usually the bass is very sufficient. Also, you can use the depth push/pull on the presence knob for more low end.
     
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  6. DreamTheaterRules

    DreamTheaterRules New and improved member

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    Plus, it’s hard to really know what someone means when they say “boxy.” These models are known for having a lot of bottom end. Many think too much unless you turn the bass knob way down. I would have guessed it was too much bottom maybe making it a bit to boomy in the bottom, but you say it’s lacking something in the bottom end, compared to Marshalls which are light in the low end.

    Turn the bass knob down. Turn the master up a bit. If the amp doesn’t open up, it needs tubes somewhere. IMHO
     
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  7. godwentpunk

    godwentpunk New Member

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    I'm really not running the master very loud at all, maybe that is the problem. I did pull the MID and the PRESENCE pot which helped a little with the bass response on my lead channel... which at the moment, has the bass set to full open. Now, the clean channel does have some better low end since making those 2 setting changes and now I have to on the clean channel turn down the bass.

    My issues might as well be from a need to learn more about the tweakingness of the amp because I've noticed turning a knob 10% makes a huge difference in its tone.

    I appreciate everyones input!

    joe...
     
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  8. Herr Squid

    Herr Squid I was severely impressed

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    Joe,

    What you're describing sounds pretty normal for that amp, if you're trying to keep it quiet.

    It's a tube amp and the fact of the matter is that it loves to be loud. Find or make an opportunity to turn all the knobs on the lead channel to noon and let her rip! This will make your ears ring, but it should be anything but thin and boxy (I did this a few minutes ago and it was glorious). Then start working the knobs to season to taste.
     
  9. godwentpunk

    godwentpunk New Member

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    So I turned things up and give myself a ear-ringing night... but yeah, when played loud, it certainly is not boxey at all. It is still a very tight amp which I link but I think I prefer a more vintage (open) sounding amp.

    I have a band practice (hopefully) at the end of the week and I'm going to bring this amp along to see how I like the tone.

    joe...
     
  10. DreamTheaterRules

    DreamTheaterRules New and improved member

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    I'll start the bidding at $500. :D So, if by "more open sounding" you mean less compressed and brighter, open up the master, turn the gain down, and turn the presence up a lot then adjust the treble content with the treble knob. Bass down low. I'm going by what worked on the C50.
     
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  11. Jo-

    Jo- f-hole lover

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    Doh I feel like an idiot. I read the title of this thread and thought it was maybe some new short scale 20 fret mini guitar! :D
     
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  12. DreamTheaterRules

    DreamTheaterRules New and improved member

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    Well, I hate to be the one to tell you this, but... you missed that one. The 20 fret mini guitar happened while you were gone.

    Oh, and some amps happened too!
     
  13. godwentpunk

    godwentpunk New Member

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    I'll give your suggestion a try this week.

    thanks for help me with this.

    joe...
     
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  14. DreamTheaterRules

    DreamTheaterRules New and improved member

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    These amps can be very bottom and mid heavy, compared to a top and high mid heavy Marshall. So, Presence up, treble to taste, mids and bottom down, get's it close to the M tone.
     
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  15. Herr Squid

    Herr Squid I was severely impressed

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    I think DTR's right on point with those suggestions.
     
  16. godwentpunk

    godwentpunk New Member

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    I have another question. I went to use my amp last night and the solo boost was not working. The light does toggle on the footswitch but I'm not getting any volume difference. I moved the knobs around on the back but that didn't help either. Could this be an issue with the footswitch or the amp? Is there anyway to test the boost by passing the footswitch??
     
  17. DreamTheaterRules

    DreamTheaterRules New and improved member

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    Two things to try. Unplug the footswitch and then plug it back in. After that, stomp the boost switch multiple times. I mean on,off,on,off over and over. Footswitches are the number one biggest issue that pedal makers have, parts wise. David Barber told me one time that almost every single part failure he had over the years was footswitches. And many times, when they stop working correctly, multiple quick switches will make them work fine again.
     
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  18. godwentpunk

    godwentpunk New Member

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    Thanks for the heads-up... So I did as you suggested and my boost is working today. I'm not sure why just the boost switch was acting up but I hope it was a one time thing. Is anyone aware of footswitches from a different manufacturer that might work?

    joe...
     
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