NAD: JMP 2104 50 WATT MV MKII 1977

Discussion in 'Marshall Amps' started by The Dose of Harmony, Jul 30, 2019.

  1. The Dose of Harmony

    The Dose of Harmony Well-Known Member

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    HI GUYS

    THERE IS AN AMPCHOHOLIC HERE!!!

    Well guys I just got home this animal its a beats I like a lot very dynamic and organic amp , I jam yesterday with and I like a lot the low input the other one its good but I dont know the low input works fine for what I need it for I guess I have the cascade circuit!!!
    I am gonna restore it new grill cloth , knobs witch I already order and the handle but I been having problems finding somebody to sell me the faceplate so I will appreciate it!!

    but I have a major problem when I was doing the clean up and general maintenance that i do to every new amp I get like cleaning sockets , cleaning pots , tight up nuts etc.. ,I found that the main fuse was wrap on aluminum foil and burnt besides and I dont know if the Ht fuse has the right values

    so guys i hope you help on picking up the right fuse i been reading a lot some say that has to be fast blow some say its slow blow , besides that some say it should be 2 amps for the main fuse and some say should be 4 amp because change in voltage from Europe

    and the last thing what valves are the right ones a gut a the store told me that must have 6550 but it already has E34l's Groove tubes and sounds very good

    I haven had the chance to read about JMp and vintage Marshall specs

    Thanks to all of you ampchoholics for the support on this terrible habit!!!
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    Last edited: Jul 30, 2019
  2. WholeLottaGlove

    WholeLottaGlove Active Member

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    HNMAD! She looks sweet! Kinda scary with the foil wrapped fuse... never seen that before :yikes
     
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  3. The Dose of Harmony

    The Dose of Harmony Well-Known Member

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    Yeah i know, and I play all day long yesterday !!!
     
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  4. marshalltsl

    marshalltsl Active Member

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    Congrats! Great amp for sure. Don't use This fuse, replace it.
    ampchoholics? Hahaha!
    Yes! The firt steep is to recognize It. Me too.
    But I always enjoy with my amps, all of them, the Marshall's and the others too.
    My problem it's always I'm thinking need two more :nuts:
     
  5. The Dose of Harmony

    The Dose of Harmony Well-Known Member

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    i Know this addiction its getting bad!!
     
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  6. marshalltsl

    marshalltsl Active Member

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    I think the HT fuse will be 0,5 A slow blow.
     
    Last edited: Jul 30, 2019
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  7. scozz

    scozz Well-Known Member

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    If I’m not mistaken 6550 tubes are the same as el34,...I’ll google it.
     
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  8. The Dose of Harmony

    The Dose of Harmony Well-Known Member

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    Yeah thats what it looks like!!

    The main fuse says 2 amps but i dont know the voltage ithink it should be 250 v slow blow
     
    Last edited: Jul 30, 2019
  9. scozz

    scozz Well-Known Member

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    Hannahhh and The Dose of Harmony like this.
  10. marshalltsl

    marshalltsl Active Member

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    For a 100W amp the main fuse it's 2 A in 230 Vac or 4 A in 110Vac(American voltage) both slow blow fuses. In 50 w amps I think it's 1 A in 230Vac (European voltage) and 2A in 110 Vac (American voltage). Could be L3A in 110Vac (American voltage). L it's a fuse that blow normal. Some people use it but it's not the 100% good.

    2A fuse 250v it's good for you if your socket voltage it's 110V
     
  11. The Dose of Harmony

    The Dose of Harmony Well-Known Member

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  12. The Dose of Harmony

    The Dose of Harmony Well-Known Member

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    Ohh ok i will see if i can find those today at the store
    Thanks man
     
  13. Troy T. Blues

    Troy T. Blues Active Member

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  14. marshalltsl

    marshalltsl Active Member

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    Brother
    Maybe it's a 3A slow blow fuse because I'm seeing in my JCM900 MK3 50W that It is 3A in 120VAC.
     
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  15. marshalltsl

    marshalltsl Active Member

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    You can buy a fuse 3A 500V slow blow or a 3A 250V slow blow. The voltage in a fuse it's the max voltage that It can suffer.
     
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  16. marshalltsl

    marshalltsl Active Member

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    Main fuse values from a JCM900
     

    Attached Files:

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  17. Mitchell Pearrow

    Mitchell Pearrow Well-Known Member

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    HNAD congratulations on your new to you amp, they are keepers!
    Cheers Mitch
     
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  18. The Dose of Harmony

    The Dose of Harmony Well-Known Member

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    Thanks Mitch !
    Man this amp its so organic and Dynamic!!
    I love the cleans that it gives!
     
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  19. The Dose of Harmony

    The Dose of Harmony Well-Known Member

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    I got an 2 A slow blow at 250 volts a guy that knows more than me told me that 2 or 3A would work but they must be slow blow!

    Now i have to find out more info why the guy who had it before had el34’s and not 6550 ?

    I guess i need to find out i what plate resistor it has no?
     
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  20. Mitchell Pearrow

    Mitchell Pearrow Well-Known Member

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    I used to have a 2104 212 combo, mine was a 1978, MV JMP, loved that amp, my first Marshall!
    Cheers Mitch
     
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