Mode Four mf350 head reliability

Discussion in 'Marshall Amps' started by adam183, Jan 24, 2020.

  1. adam183

    adam183 Member

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    I picked a half stack with this head, mainly for the 1960 lead cab and because the price was good. i was planning on selling the head on but its pretty cool.

    the rig has one previous owner, home use only and pretty excellent conditon.

    personally i think the head sounds good, but i don't have issues with SS or hybrid amps.

    but my main concern is the reliability of the unit. I am not going to gig with it or work it hard,
    so are the power IC's going to last? or should i get rid? :jam:
     
    Last edited: Jan 24, 2020
  2. ampmadscientist

    ampmadscientist Well-Known Member

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    Start the reactor... Free Mars!
    Keep the fans lubricated/maintained or replaced.
    Keep the pots lubricated or replaced.
    Protect the volume / tone pots from physical damage because the pots are delicate easily broken.
    Other than that it sounds like the killer metal amp.
    I think it could go up against almost any other amp, I love MF. It has really nice chunk and grind, select-able notch filters, built in effects, loud as a motherforkler, sounds like a forkling chainsaw, what more could you ask for?

    Actually, Mode Four is the king of the Valve State Amps.
     
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  3. FracStrat

    FracStrat Well-Known Member

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    Does it need Sodium / Nitrogen hybrid Super Cooling ??
     
  4. Micky

    Micky Well-Known Member VIP Member

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    I gigged with one for years, it is pretty reliable.
    I had difficulty with it sounding good at low volume, so for that I used a Fender amp as well.
     
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  5. 6550

    6550 Member

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    As was stated above, make sure the fan never stops or she'll burn up lickety-split.
     
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  6. adam183

    adam183 Member

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    yes, I will giving it a good clean, changing the valves and fans, although marshall do not sell the fans anymore!

    is it just bad cooling that causes the issues with the power output IC's burning up then?
     
  7. ampmadscientist

    ampmadscientist Well-Known Member

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    They should have spec'd external coolant connections.
     
  8. Trelwheen

    Trelwheen Well-Known Member

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    The MF cabs are killer too, if you can find one. Paired with an MF400 4x12 (G12K100s) you should be able to wipe out entire cities. The ones I see for sale are pretty cheap.... I don't know why they weren't more popular
     
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  9. ampmadscientist

    ampmadscientist Well-Known Member

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    The lubrication in the fans can get sticky. There are better fans you could install probably.
    But LPS-1 is made for electric motors, so every once in a while just make sure the bearings are free. It's not a major problem, just normal maintenance.
     
  10. ampmadscientist

    ampmadscientist Well-Known Member

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    It's kind of funny but the MF SS 350 watt sounds about as loud as a super lead tube 100W.
    About the same loudness which is ridiculous.
     
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  11. ampmadscientist

    ampmadscientist Well-Known Member

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    Just observe the cabinet impedance and don't put too much load on the SS power amps.
    16 ohms or 8 not 4 ohms I would recommend.
     
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  12. FracStrat

    FracStrat Well-Known Member

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    What ??? No Gladhand Super High-pressure Dongles ????
     
  13. ampmadscientist

    ampmadscientist Well-Known Member

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    Should have used a Stainless explosion proof oxygen rated check valve IMHO.
     
  14. FracStrat

    FracStrat Well-Known Member

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    Yep
     
  15. Harlequin tusk

    Harlequin tusk Well-Known Member

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    The MF is only 16 or 8 ohms, no 4 ohm loads allowed!
     
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  16. adam183

    adam183 Member

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    yeah been reading that in a few places, still i am happy with the 1960 and i got a good deal.
     
  17. ampmadscientist

    ampmadscientist Well-Known Member

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    I think a MF might melt a 1960 cab...
     
  18. adam183

    adam183 Member

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    thanks, is that a good thing to use on the pots too?
     
  19. adam183

    adam183 Member

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    Oh! the guy i had them off has owned from new and i don't think its ever been abused, they are both in really good condition and i am not going to be able to get very loud either so should be ok?!
     
  20. ampmadscientist

    ampmadscientist Well-Known Member

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    You can use LPS-1 on pots too yes.
    On this amp:
    Wrap the pot in a paper towel.
    Drown the pot in LPS-1 and turn the shaft several times.
    The pot appears "sealed" but it's not really.
    When the pot swims in LPS-1, the lube will leak into the pot through the small seams in the pot casing.
    The lube gets inside the pot, and you will feel the shaft loosen up as you are turning it.
    Wipe off the excess lube with towels etc.

    If the pot has a broken shaft it will need to be replaced. Check the pots for broken shaft etc.
     

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