I really love this little amp. It drives all headphones surprisingly well. I have a ZMF Auteur, He-6seV2, Focal OG Clear, and HD-6XX. I have replaced the tubes with four Sylvania Jan 5654w. Those tubes are very good and very cheap at under $10 per tube. And my DAC is a Bifrost 2.
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I agree, itâs wonderful! I use it with L&P W2. May I ask where you got the Sylvania tubes from?
Ebay. The seller was vacuumtubesdotnet
Could you please compare them to other tubes that youâve tried like maybe ge or voskhods?
I donât have those tubes and donât intend to buy them. These sound so good on their own that I donât feel the need to try others. I also really like Sylvania tubes in general. I use them for the Darkvoice and Valhalla 2
I crack myself up because I got these 2 really good, matched sets of PS Vane and Mullard tubes for the TA-20, but I love the way the Gold Lion tubes I currently have in the amp sound so much I canât bring myself to take them out! Iâll get there; I guess itâs gonna take longer than I thought.
Hi,
If anyone got this great 604 amp and also BLON BL01 (gun) dont hesitate to pair. Surprisingly bl01 driver takes 2w power and basshead level bassâŚnot muddy not bloat but controlled well extended star of the show. Mids are great tube mids and excellent extension. Dont miss out.
My setupâŚPhoneâŚuappâŚtempotec e44 feeding mt604 using 4.4 interconnectâŚblon bl01 gun with pure copper 4.4 cable (mt604 only loves copper) and final e tips for balanced musical sound.
Tips. Connect e44 first to mt604 before connecting dongle to phone and launch uapp first then connext dongle and authorize to use exclusive use to get full power.
Thanks for reading.
what headphones are you using
i should be able to use the dac from the btr5 if i use the 4.4mm in with a 2.5mm converter, right? If anyone has either iâd appreciate testing, tried googling but couldnât find much info
Should be possible youâll just have to look how much voltage it pushes from itâs output (4vis the standard for balanced ) or or if it even has a line out option in the app Menu 
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btr5 pushes 2.77vrms outside of the 2.5mm port, iâll mostly be using the 604 for iems anyway so only supplying 2.77 shouldnât be an issue, it doesnât officially have a line out but other people have used the ports as line outs so i guess it does?
Jopp, as long as it wonât overdrive the amp all is fine and if the below 3v are correct youâll be fine
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Question do you gents and ladies turn off your amp ever? How long should I expect the tubes to last?
I ordered new ones for a upgrade but on my home amps I never turn off ever?
I keep my Asgard 3 on, I do turn tubes of all kinds off.
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Normally itâs fine to leave solid states amps on all the time. But youâll want to turn your tube gear off because tubes have a limited life span. Even if the amp is not actively in use, youâre still eating up the usable hours on the tubes when on
very good amp, drives everything with loads of headroom
This amp is magical for IEMâs I used my LETSHOUER EJ07M Kinda Lava and IKKO Obsidian OH10 both were great but the Lava ummmmmm
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Approved!
Both the 604 and the 602 harmonize perfectly with ChiFi IEMâs.
Clean, significant stage magnification, clear bass response
âââââ
P.S.:
The Koss KSC75 also sounds great on the 602 
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Just bought a used Loxjie P20 as well for super cheap mint once I get my Bal XLR in / out be interesting comparison.
Love your XLR adapter thatâs sweet
My dude, did any of the tubes you bought for this just make the whole thing sound bigger?
Just picked one of these up and Iâm looking to roll!