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[WTD] Cheap MC Cartridge for RB250 Arm

Discussion in 'classifieds' started by Weeman1973, Nov 28, 2019.

  1. Weeman1973

    Weeman1973 Big Country Member

    Anybody got an inexpensive MC cartridge they want to move on?

    Want to try the MC stage on my Crayon Amp with my Manticore Mantra with the RB250 arm.

    Anything around the £80 mark would be spot on!

    Thanks.
     
  2. rich46

    rich46 quad rules

    orttifon bronze 200 hours £90 tracks great .been a spare for awhile
     
  3. FluidDruid

    FluidDruid Active Member

    Is that the 2m Bronze? - not an MC :)

    I have an Ortofon MC10 Supreme that's currently sitting on my RP6 - Was about to swap it for my 10x5 which has sat next to it for a few years!
     
  4. david ellwood

    david ellwood Kirabosi Kognoscente

    Whilst on the subject , I’d like a valve power amp for £75
     
  5. Weeman1973

    Weeman1973 Big Country Member

    Thanks Rich but after a cheap MC, not MM cartridge
     
  6. Mike Reed

    Mike Reed pfm Member

    I was under the impression that RB250s were not that suitable for m/coils. Maybe there are some with higher compliance that'll do, but I remember a friend going to a 300 to accommodate his Ortofon m/coil.
     
    Weeman1973 likes this.
  7. Yank

    Yank Bulbous Also Tapered

    There's a difference in mass between the 250 and 300?
     
  8. Weeman1973

    Weeman1973 Big Country Member

    Ahhh, good point - need to look into this a little further then thanks.
     
  9. Mike Reed

    Mike Reed pfm Member

    Interesting. The E.M. of the 300 is actually half a gramme less than the 250 at 11.5g. Same ball-park as the SME 5 (and 4?). Certainly not the best for lower compliance coils, but I don't know why the 250 was considered generally unsuitable for coils; bearings maybe? I've had a Koetsu Black G and Urushi in my previous Five (as well as Lyras, but their compliance is much lower) and they were okay, though the Five is known for being very versatile and is a much better arm, of course.

    Maybe it's simply lower compliance coils which are less compatible, and they were the norm when the 250 came out (not that there were many compared to m/magnets).
     
  10. Yank

    Yank Bulbous Also Tapered

    Isn't the main difference between 250 and 300 just the method of applying downforce? And the quality of the counterweight and stub? The 300 had a heavier sintered tungsten counterweight available as an option, needed for heftier cartridges.
     
  11. Mr Pig

    Mr Pig ^'- -'^

    Na, there's actually a whole rake of differences. In fact, apart from the arm tube, there isn't very much about the two arms that is the same.
     
  12. Yank

    Yank Bulbous Also Tapered

    What else, besides the two items I listed?
     
  13. Mr Pig

    Mr Pig ^'- -'^

    Over the RB250, the RB300 has:

    Stainless steel pillar, brass on the 250. Better alignment and greater rigidity.

    Vertical bearings on a stainless shaft rather than pressed into the alloy armtube boss. Better alignment, consistency and rigidity.

    Dynamic rather than static tracking force application. Better tracking.

    Denser counterweight.

    Different bearing yolk and shaft.

    Basically, all of the working and structural parts of the arm, other than the arm tube, are different. The tube is the biggest and most visible part so the two arms look very similar.
     

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