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mvsantorini
38
Jul 15, 2021
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The MT-604 is pretty decent-sounding with it's stock tubes, but unfolds & comes alive with matched 5654 tubes (about $40 from Riverstone Audio). Mine is fed from a Grace Balanced DAC, and does a wonderful job of driving HFMan Devas. This is my computer setup & gets listened to daily - Hitomi Uehara and the Mighty Maytones make work just fly blissfully by - I've spent lots more for far less pleasing results.
Jul 15, 2021
Fayne
2143
Jul 15, 2021
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Makes sense. Chinese 6J1 tubes are usually OK, but very much so not amazing. I generally find they have some really painful treble before they break-in. The GE 5654W are pretty much always better than the stock in most all amps that can take them, even before break-in. I like them enough to have bought a sealed factory box https://drop.com/talk/29131/photos. $1.125 a tube was a deal I couldn't pass up. Same, this is one of my computer amps. For music I feed it from Roon -> RaspberryPi4 -> Drop+Grace SDAC-B -> Behringer XR18 mixer, and with the turn of a knob, directly from Roon -> RaspberryPi4 -> SMSL M500. I'm rather happy with the unit, though it does have some issues with ultra-sensitive cans like the Drop+Meze 99 Noir and JVC HA-SW01. 6AK5/6J1 tubes tend to be a bit on the microphonic side, and the sensitive cans really pick up pings from moving the cable. Other than that, it has been working wonderfully with my HE-4XX, HE-5XX, HE-X4, T1.2, HD58X, HD6XX, HD820, Elex, and ATH-R70x. Work music of choice for me is Tangerine Dream, AstroPilot, E-Mantra, and Infected Mushroom. Totally get into that electronica groove while coding. And yes, I have spent far more for on amps than this little guy, just to get similar or worse results. I won't say this one is better than the xDuoo TA-20, but it is dang close and eats cheaper cooler tubes.
(Edited)
Jul 15, 2021
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