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Machlett 3+500zg tubes

Discussion in 'Amplifiers' started by 552fl, Sep 26, 2018.

  1. 552fl

    552fl Active Member

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    Looking at these for my Heathkit sb-220.. anyone have any reviews on these tubes? Are they comparable to the ones that rf-parts sell.
    The price is very nice too.


     

  2. Road Squawker

    Road Squawker Sr. Member

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    Didn't RF Parts stop selling them a few years ago?

    They can be found on flea bay and the K5SVC web store... one year warrantee
     
    552fl likes this.
  3. nomadradio

    nomadradio Analog Retentive

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    Frank is the real McCoy. The Machlett tubes are RF tested, not just DC-voltage tested.

    His tubes would be my first choice.

    RF Parts is always good to go. I recommend the brand with the longest warranty.

    Think about it. That's the tube that the seller trusts the most.

    Avoid "white-box" tubes, especially from Greenstone. Every customer who brings those to us ends up disappointed.

    73
     
    552fl and Shadetree Mechanic like this.
  4. 552fl

    552fl Active Member

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    The machlett brand tube is looking better and better
     
  5. 552fl

    552fl Active Member

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    The penta brand cost a little more I wonder if they are better than the Machlett brand all coming out from the same company
     
  6. nomadradio

    nomadradio Analog Retentive

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    Penta is now just a brand name printed on a chinese-made product. I don't see any advantage to that brand, regardless of price. The care with which the tube's final processing and testing are done are what separate the cheap "poof" tubes from the good ones.

    73
     
    552fl likes this.
  7. 552fl

    552fl Active Member

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    I agree with you 100% for sure...
     
  8. Dmans

    Dmans Well-Known Member

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    +1 on that Comment!

    73's
    David
     
  9. wavrider

    wavrider W9WDX Amateur Radio Club Member

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    Myself and some locals here use Machlett tubes, never any issues
     
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  10. 552fl

    552fl Active Member

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    Just ordered me a pair of matched 3 - 500zg machlett tubes from Penta Laboratories in California they had them on sale could not pass up the price. this should give my sb220 more get up and go now...
     
    Dmans likes this.
  11. 552fl

    552fl Active Member

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    shipping is very siow,,
     
  12. 552fl

    552fl Active Member

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    says wont be getten them till oct 17,, wow
     
  13. 552fl

    552fl Active Member

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    forgot to reply back tubes came in just 3 days to florida ….wow very happy with them.
     
    Dmans likes this.
  14. Dmans

    Dmans Well-Known Member

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    552fl,
    So how do they perform compared to their predecessors? Have you completed the Harbach mods? New fan?

    73's
    David
     
  15. 552fl

    552fl Active Member

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    Hello David everything going good here with the sb-220 added new capacitors from harbach and the new metering board ...had to order the new parasitic suppressors from France will be here to end October to November 6.. very happy with the wattage out now can not indulge on the number because everyone here will...well I won't go there.. the parasitic suppressors are still good but i wanted the new one being 30 years old outdated I wanted the new Nichrome wire ones. Waiting to put the new fan in when the parasitic suppressors get here
     
    Dmans and Shadetree Mechanic like this.

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