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| |-+  JCM 800 2203, 2204, 2550, 2555
| | |-+  new 2550 owner
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Author Topic: new 2550 owner  (Read 2399 times)
lvrocker
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« on: February 15, 2013, 08:40:14 PM »

hi all, maybe some seasoned 2550 users can help me here.

Just picked up a used (in most excellent shape) 2550. Thing is, I have no idea what the heck I'm doing here. I've dialed in some good tones for sure but kinda confused on what exactly output mater, lead master and output gain all do, seems each channel they have different functions.

- It looks like there's a foot switch inside on the top of the chassis...what the heck does that do.

- Rhythm clip..I can hear what it does but what is it doing under the hood and what scenario is it best used in?

thanks in advance!
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ToneQuest
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« Reply #1 on: February 16, 2013, 05:54:25 AM »

If you're looking for the Joe Bonamassa tone, try the following:
Presence 12 o'clock, bass cranked, Mids 2 o'clock, Treble 10 o'clock, MV cranked, Volume to taste, Gain 12 o'clock. Set for OD channel and Rhythm clip off. No need for the footswitch.
Some Boss DD delay in the loop and a Tubescreamer in front set clean for some lead boost and there you go.
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lvrocker
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« Reply #2 on: February 16, 2013, 08:28:36 AM »

Thanks Tone.

I found the layout on their website, i see that 'footswitch' thing is actually the bias pot - mystery solved on that.

Looks like the rhythm clip may tweak the preamp stage somehow...

anyway, great amp though, kicks ass
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ToneQuest
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« Reply #3 on: February 16, 2013, 09:11:21 AM »

If you moved the bias pot, make sure you rebias the amp properly.
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Joe L
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« Reply #4 on: October 04, 2013, 01:29:18 PM »


- Rhythm clip..I can hear what it does but what is it doing under the hood and what scenario is it best used in?

thanks in advance!

The Rhythm Clip is just that.  It connects a couple of diodes to ground which symmetrically clips (square wave) the waveform.  There is a capacitor across the diodes to help filter some of the harsh harmonics but it is still going to sound buzzy.  If you push the Master Volume enough to get the power amp to distort, it will smooth it out some and may be a sound you like.  But mostly it's just kind of gimmicky.

The Lead channel uses a more complicated network of diodes/LEDs that is much more musical sounding due to being asymmetrical.

..Joe L
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