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Will this work well with Fidelio X2
I've had mine for a year or two now. I really enjoy listening to live music through it. Guitars sing and voices are a smooth buttery and prominent.
Can I use a 12AX7 or 12AT7 tube on it? I don't know if there's any danger if I change the 12AU7 tube to others.
sounds pretty good, lowers the bass output a little bit with the included tube. (my first tube amp).

is anyone else's amp make a loud pop when powering on/off the amp with headphones plugged in? (im using Sennheiser HS598) my mayflower o2 doesn't pop when i power on/off.
Nice little amp and very securely packaged! Sucks it doesn't come with rubber feet though; I'll have to get some.
should shaking the amp distort the sound? or is something broken in mine?
ephyoosecay
Vacuum tubes are sensitive to external vibration.
mikeonline
Good deal, thanks man
The amp works well, although i received a faulty power cable, luckily i had one in use somewhere else i could borrow, but ill contact massdrop support to see about a replacement.
All of the orders have been shipped and are now on the way to you! Once tracking is available, you will receive a confirmation email with tracking information. Please allow 24-48 hours for this information to update in the courier’s system.

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We have some great news to share with everyone. Our vendor has all the necessary inventory on hand and will begin fulfillment tomorrow! All individual orders should be out the door by week's end.

Expect an update from us by the end of the day Pacific Time on 5/3 or sooner if something comes up.
Our vendor has informed us that inventory will become available to them towards the beginning of next week. They will be working hard to prepare all your individual orders for shipment and aim to have this drop fulfilled by 4/27.

Expect an update from us by the end of the day Pacific Time on 4/26 or sooner if something comes up.
Thanks again for joining this drop! We have submitted the group's order with the vendor for the Bravo Ocean Tube Amplifier and they are working hard to prepare it for shipment.

As soon as the group's order is ready at the vendor's location, they will send the bulk shipment to our warehouse in New Jersey where our warehouse team will break it up into individual orders and ship them. The current estimated ship date from our warehouse is 4/28.

We will keep the group updated throughout the fulfillment process. You can expect an update from us by the end of the day Pacific Time on 4/19.

If you have any questions, please visit our Help Center (massdrop.com/helpcenter).
WTF 30db gain?
Does anyone know if this amp is strong enough for Fostex T50RP MK3? I was told that the headphone is very power hungry headphone and not sure if this amp has enough power to drive the headphone. Anyone can answer would be very helpful. Thank you.
What is the AC input voltage? Is is strictly 110V (US) or is it 110-240V (works in US, Europe and Asia)? Thanks.
Can this be used with USB headphones ?
varranis
No, unless they have a 1/4mm jack.
In my apartment, when I plug in my speakers they make an electrical hum sound. Would something like this clean the sound and remove the humming? (Apologies if this is an obvious or unapplicable question)
Loot
Most likely you have an improper ground and or noisy incoming power. This is a headphone amp and is not applicable to your situation. A good power conditioner may help your situation but there are other methods for chasing electrical hum. Google is your friend.