Headphone amplifier KIT "Lunch Box II"

Discussion in 'Product Announcements' started by Zampotech, Jun 6, 2019.

  1. purr1n

    purr1n Finding his inner redneck

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    SBAF is not about rules. It's a smaller site so common sense and individuality reign supreme. This drives rule-based people nuts, but what I can say because my D&D alignment is chaotic good.*

    Post away. You have earned an exception to be able to post eBay links. And it's obvious you are doing this more for fun and to help others rather than become one of the oligarchs. Heck, I don't even care if you become an oligarch because you'd probably organize a CanJan Moscow, pay for our plane tickets, and get us all toasted on good vodka, while giving each of us a tweaked JLH or NBM as a parting gift.

    *I'm pretty sure Jude is lawful evil.
     
    Last edited: Jun 23, 2019
  2. purr1n

    purr1n Finding his inner redneck

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    Under headamps. We can also move or reorganize later.
     
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  3. fraggler

    fraggler A Happy & Busy Life

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    How would one of these compare to hybrids like the Vali 2 or MCTH for Sennheisers (HD6XX and HD800). About the same price as a new Vali 2 or used MCTH. Would be used with one of the Modis as a DAC.
     
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  4. joch

    joch Friend

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    Am I late for this? I'd like 220v please.
     
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  5. Zampotech

    Zampotech Friend

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    No not late. On 220 volts still there is.
     
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  6. Stefani

    Stefani Acquaintance

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    I'd like one for 220V please.
     
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  7. joch

    joch Friend

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    I've asked @Zampotech if there's a list of materials to improve on the LB2.

    With his permission, the below are possible "upgrades" you can pour into a $180 DIY kit (in case you have a spare RK50 or some unobtainium caps lying around):

    1. The form factor RK16 potentiometer nominal valueof 20..50 kOhm For example the production of ALPHA or ALPS
    2. Two capacitors 100 microfarads to 200..250 volts.
    3. 6N3P to 2C51 tube

    You can shunt the output capacitors with filmcapacitors.

    [​IMG]
     
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  8. Taverius

    Taverius Smells like sausages

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    Sourcing a nice pot sounds like a good idea if anyone knows where to get a non-counterfeit alps of the right size :rolleyes:

    I think I'll pass on the caps, if someone finds a nice pair of caps that improve things for 50 bucks or less sure, but cap rolling gets stupidonkously expensive fast.

    I do have a bunch of 2c51/396a tubes lying around, so I guess I might try that.
     
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  9. Zampotech

    Zampotech Friend

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    Maybe I have little experience in counterfeiting, but I have not seen fake RK16 ALPS. Fake RK27 ALPS I met more than once.
     
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  10. Cspirou

    Cspirou They call me Sparky

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    Well, rk50 at $700 probably has plenty of counterfeits
     
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  11. Zampotech

    Zampotech Friend

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    I'm afraid to think where you can put a potentiometer for $700
    Position sensor rudder, jet engine rocket SpaceX?
     
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  12. Zampotech

    Zampotech Friend

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    Dear friends

    All those who first wished to purchase this kit were offered a link to eBay. All who wished acquired. The KITs are on their way to new owners.
    Many thanks to the buyers and interested
    Unfortunately, my eBay account doesn't allow me to place more KITs. The account is new and has limitations.
    You can apply directly or wait for the eBay limit to expire
    Terms of sale $199 - free shipping by airmail. $20 will be refunded after unlocking the money on PayPal as SBAF donations on your behalf or refunded to you.
     
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