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Monoprice Monolith Liquid Platinum - By Alex Cavalli

Discussion in 'Headphone Amps (full-size)' started by ufospls2, Apr 4, 2018.
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  1. ZenErik
    I never had any issues getting tubes out of my Vali 2 or Valhalla 2. Wouldn't say it was any more difficult than other tube amps I've used.
  2. Zachik
    Going to be VERY interesting once people start comparing this one to the Schiit Lyr3.
    I know Lyr3 is NOT balanced, but still...
    I am literally going to hold off on the Lyr3 until this one comes out (or at least until reputable reviewers I trust start comparing them) :wink:
  3. greenkiwi
  4. gr8soundz
    Last edited: Apr 20, 2018
    alphanumerix1 likes this.
  5. runeight
    As you guys think on linear supplies, note that you will need 36V 1.5A. The platinum runs about 650mA at idle.
  6. runeight
    Here's the board that was just at CanJam. platinum 2018.jpg
    Odin412, sriracha, FrostyP and 5 others like this.
  7. bunkbail
    Maybe this is a dumb question, but can't you use 12V and 24V iFi iPower in series to power the Liquid Platinum? It seems plausible theoretically, but I don't know if its practical or not.

    EDIT: I can't find any 24V iPower, so maybe 3 units of 12V/1.8A then?
    Last edited: Apr 20, 2018
  8. runeight
    I can't say that it won't work, I just suggest that you be really careful what you do. Do not exceed 36.5V under any circumstances.
    Luckbad likes this.
  9. Luckbad
    There are quite a few old school linear power supplies that can be had for under $100 at the required ratings.

    Power Designs Model 5015T and HP/Agilent/Keysight 6289A are excellent choices, for example (there are many more as well).

    For marginally more DIY requirements, you can also make a best offer for an Acopian A36MT230 for less than $100.

    Really, there are quite a few options. You can find some decent LPSUs from overseas at the required ratings (you'll likely need to ping them via eBay to get something at 36V), but I'm personally inclined toward the vintage regulated power supplies and happen to own 3 of them right now.
    braaam and ZenErik like this.
  10. gr8soundz
    iPower only goes up to 15V and DC iPurifier can handle max 24V. Chaining them together may not work and might be unsafe above 24V/3.5A.

    You'd think a standard IEC plug would be a better solution at 36V but perhaps too noisy.
    Last edited: Apr 20, 2018
    alphanumerix1 likes this.
  11. bunkbail
    That's not what I said though. I never mentioned anything about DC iPurifier. I don't know how they do it but I've seen people running 3 units of Uptone LPS-1 in series, I can't see why you can't do that with iPower.
  12. Luckbad
    The iFi DC iPurifier and UpTone LPS-1 are completely different products. The iFi is a noise filter. The UpTone is a power supply.

    It's possible to run some power supplies in series to increase voltage output or in parallel to increase current. The UpTone can be used in series to increase voltage. Multiple LPS-1s would be a massive waste of money. You're into modern lab power supply price territory and they're probably way better... Just an opinion though.

    If you can fry the iFi above 24V, adding more filtration won't unfry the first unit. You'd have to contact iFi to see what they think, but I imagine if it could be rated for 36V it would be.

    One other possibility if the Liquid Platinum's SMPS responds well to reactive loads is the @atomicbob Noise Nuke. It's a great, inexpensive project and works really well for certain power supplies.
    jinxy245 likes this.
  13. bunkbail
    It certainly is interesting! I can see that you also built one with a nice case. May I know where did you buy the case? I'm pretty intrigued to build one myself.
  14. ZenErik
    Has there been any info about the low and high gain settings on this? Thanks
  15. m-i-c-k-e-y
    Was looking for a 36v LPS myself thinking IF will be going this route. So far only ZeroZone (CN lps maker) say they can do it in 36v. Didn't gave me a price though
    alphanumerix1 likes this.
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