• macg1
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  • From: St. Petersburg, FL
  • Registered: 2010-01-21
  • Posts: 1,020

Topic: May be joining the Marshall Militia this week!

I may be having a new amp week.  A 1983 Marshall JCM 800 2204 (50 Watts) with the vertical inputs.  This is exciting...

Amp: Firebird Musical Amplifiers
Guitars:62 LP SG , 02 FB VII, JB FB I, 76 Electra Omega, 64 Firebird V, 73 LPC, 61 Custom Tele, 59 and 60 Melody Maker
Effects: Mythos Chupacabra, Strymon Deco/Flint
  • Registered: 2010-07-09
  • Posts: 122

Re: May be joining the Marshall Militia this week!

We'll need the obligatory tone samples for it to be officially recognized.  lol  lol

Guitars: '79 LP Custom, '01 Dickey Betts Goldie - 80 of 114, '00 Chandler Lectraslide
Amps: '00 Marshall 1987x, '70 Marshall 1959 SL, 4x12 JBL D120s
'64 Vibroverb - JBL D130, '66 Super Reverb - CTS Alnicos
'77 Peavey Deuce (great for melting stubborn ear wax)
  • From: Georgia
  • Registered: 2010-12-01
  • Posts: 278

Re: May be joining the Marshall Militia this week!

macg1 wrote:

I may be having a new amp week.  A 1983 Marshall JCM 800 2204 (50 Watts) with the vertical inputs.  This is exciting...

Congrats. I picked up a JCM 900 50 watt last week with the 1960A cabinet. It was to good a deal to pass up.

  • macg1
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  • From: St. Petersburg, FL
  • Registered: 2010-01-21
  • Posts: 1,020

Re: May be joining the Marshall Militia this week!

I DID IT!  Baby is home and WOW!  I am going to need some serious time with it to discover how to control everything from my guitar volume knob, but I see already that some boost/overdrives will go away.  This is a LOUD mother of an amp.  And I played a SJ 50 W before.

For the experts out there.  there are two speaker outs in the back.  What is the difference?  The impedance selector is set at 8 Ohms now.

Amp: Firebird Musical Amplifiers
Guitars:62 LP SG , 02 FB VII, JB FB I, 76 Electra Omega, 64 Firebird V, 73 LPC, 61 Custom Tele, 59 and 60 Melody Maker
Effects: Mythos Chupacabra, Strymon Deco/Flint

5 Reply by Sonicboom (edited by Sonicboom 2011-02-04 12:49:41)

  • Registered: 2010-07-09
  • Posts: 122

Re: May be joining the Marshall Militia this week!

No difference in the output jacks.  It's just so that you can drive two cabinets.  Set the amp impedance to match that of your cabinet. 

For running with two cabinets:

Both cabinets should have the same impedance (both 8 ohms, not one 8 ohms and one 16 ohms)
Set the amp impedance to 1/2 of the cabinet values (both 8 ohm cabinets - amp impedance should be set to 4 ohms)
If the cabinets have switchable impedance, set each to the highest value - generally 16 ohms.  Then, set the amp to 8 ohms
Install VERY LARGE earplugs, dime the amp and hit an A chord - you are now Angus Young, and the police will show up soon.   lol

Guitars: '79 LP Custom, '01 Dickey Betts Goldie - 80 of 114, '00 Chandler Lectraslide
Amps: '00 Marshall 1987x, '70 Marshall 1959 SL, 4x12 JBL D120s
'64 Vibroverb - JBL D130, '66 Super Reverb - CTS Alnicos
'77 Peavey Deuce (great for melting stubborn ear wax)
  • macg1
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  • From: St. Petersburg, FL
  • Registered: 2010-01-21
  • Posts: 1,020

Re: May be joining the Marshall Militia this week!

Sonicboom, many thanks!  I just found the manual for it online too.

Amp: Firebird Musical Amplifiers
Guitars:62 LP SG , 02 FB VII, JB FB I, 76 Electra Omega, 64 Firebird V, 73 LPC, 61 Custom Tele, 59 and 60 Melody Maker
Effects: Mythos Chupacabra, Strymon Deco/Flint