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Monoprice 25W Stereo Hybrid Tube Amplifier w/ Bluetooth EXPIRED

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Monoprice has Monoprice 25W Stereo Hybrid Tube Amplifier w/ Bluetooth on sale for $109.99. Shipping is free. Thanks majaym
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This amplifier offers 25W/channel w/ Bluetooth v.40 wireless streaming. 5-way binding post speaker connection w/ 20Hz ~ 20kHz frequency response. Offer valid while promotion last - Discombobulated

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This thing is fake....

Its got a 6p1, which is just a low power EL84, but it doesnt "amplify" because you do not use a EL84 power tube in a pre amp. It uses a 6N1P, which is a preamp tube, but it has a gain of 33.

Now the whole "preamp tube stage" then goes through a standard "opamp" before going to a standard 25 watt "non discrete" IC output stage.

So the whole thing is pointless. Lets assume your input signal is a "low" 2.5 volt. Your output voltage is going to be 14 volts (8 ohm 25 watt). That means you need a gain of like 10 tops.

So that means the signal goes through the 6P1 power tube in a weird buffer mode. Then it goes through the volume control that attenuates the 2.5v signal down to odds are .25v. Then it gets gained up 30x via the 6N1P (along with 10x the noise because you roached 90% of the signal). Then the now 7.5v signal is buffered back down to 2.5v by the Opamp(because the power stage can not handle more than 5.1v in). And finally sent into the output ICs that odds are, are running 20v rail to rail voltage...


A "real hybrid" would have the tube stage doing all the voltage amplifying and have discrete pnp and npn transistors as output/current buffers so you would have a nice low output impedance vs tube, for driving multi driver speakers with complex crossovers.
The thingy neuters the cd quailty sound down to guitar pickup level, then amps the thing up back to cd quailty sound with tubes, then sends the sound to a goldstar/radio shack quality 25 watt amplifier that has the volume control permanently set to 1/4 volume.
I think this review is of the 50w model. Maybe they got a defective unit? Sharp contrast to other reviews and posts here about audio quality being good.

https://www.audiosciencereview.co...-amp.7513/

Conclusions
The monoprice hybrid tube amplifier nails the looks and aesthetics. The mechanical engineer and material procurement people deserve an A. The electronics designer know, gets a failing grade if he though this is a hi-fi product. Poor guy though was likely told to build this for nothing.

Congratulations are in order then for Monoprice to have produced probably the most faulty, and poorly measuring audio product I have tested to date. This would be good as a conversation piece on your desk and that is about it.

NOT recommended.

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#4
Anyone know anything about this being good or not?
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#5
Quote from Leviathan303
:
Anyone know anything about this being good or not?
The review videos were both fairly positive and having listened to the audio signal it sounds pretty impressive for the price. If I didn't already have a Dynaco ST-70, I'd definitely get one of these for vinyl. It also supports bluetooth.
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#6
I've had one of these for 2-3 years and I've gotten $100 of enjoyment out of it, for sure. I feed it with an Echo Dot using a 1/8" to RCA splitter, and send it out to a pair of old 4 ohm Canton Karat 30 speakers. Once the tubes warm up, it sounds fantastic (and yes, mine will not output sound until the tubes have warmed. maybe it's a different version?) The only problem I've ever had is with the volume knob being a little noisy, but I don't tend to change the volume much, and didn't want to waste my time taking it apart to clean. Never tried the Bluetooth, though. Definitely an interesting conversation piece in my living room when the lights are dimmed and the tubes are glowing softly.

There will always be "audiophiles" complaining about it, though. Whatever. The fact that my source is an Echo Dot should tell you where I stand on "audiophile" opinions laugh out loud

By the way, when the monoprice stop having good coupons?? For example, I got this thing for under $80 with a coupon. I'm a "VIP Member" due to the thousands I spend there, but I feel like I haven't received a nice discount in over a year. I would definitely impulse shop more if they sent me a coupon every now and then.
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Last edited by DerProfi July 22, 2020 at 03:49 PM.
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#7
Hope the 50w model is also on sale.
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#8
I've owned this model for ~4+ years. excellent sound and asthetics for a nice set of book shelf speakers.

I had them paired with an older set of bose speakers and more recently a pair of the Andrew Jones Pioneer speakers.

It this amp wont blow your pants of but it does supply a good warm signal.

To my ears there is a noticeable quality difference between BT and aux inputs.
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#9
Quote from JoshuaB3661
:
To my ears there is a noticeable quality difference between BT and aux inputs.
Assuming the aux inputs sound better?
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#10
I've currently got Monoprice's non-descript DAC and headphone amp [monoprice.com]
(which itself I only got because it looked like a de-branded version of my beloved E09k amp [amazon.com] that died).

Do the tubes really add that much to the sound? Or is it more for that retro kitsch of having a tube amp?
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#11
Quote from ZhangZ5375
:
Hope the 50w model is also on sale.
I wish too, but not currently. But then thinking about it, the 25W(if they are true to it) might be good enough power when driving only your tweeters, which is where you need the warmth
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#12
This thing is fake....

Its got a 6p1, which is just a low power EL84, but it doesnt "amplify" because you do not use a EL84 power tube in a pre amp. It uses a 6N1P, which is a preamp tube, but it has a gain of 33.

Now the whole "preamp tube stage" then goes through a standard "opamp" before going to a standard 25 watt "non discrete" IC output stage.

So the whole thing is pointless. Lets assume your input signal is a "low" 2.5 volt. Your output voltage is going to be 14 volts (8 ohm 25 watt). That means you need a gain of like 10 tops.

So that means the signal goes through the 6P1 power tube in a weird buffer mode. Then it goes through the volume control that attenuates the 2.5v signal down to odds are .25v. Then it gets gained up 30x via the 6N1P (along with 10x the noise because you roached 90% of the signal). Then the now 7.5v signal is buffered back down to 2.5v by the Opamp(because the power stage can not handle more than 5.1v in). And finally sent into the output ICs that odds are, are running 20v rail to rail voltage...


A "real hybrid" would have the tube stage doing all the voltage amplifying and have discrete pnp and npn transistors as output/current buffers so you would have a nice low output impedance vs tube, for driving multi driver speakers with complex crossovers.
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Last edited by nightanole July 21, 2020 at 09:00 AM.
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El Conquistador
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#13
Vacuum tubes and bluetooth together, impressive!
What's next, a victrola with HDMI?
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#14
Quote from nightanole
:
This thing is fake....

Its got a 6p1, which is just a low power EL84, but it doesnt "amplify" because you do not use a EL84 power tube in a pre amp. It uses a 6N1P, which is a preamp tube, but it has a gain of 33.

Now the whole "preamp tube stage" then goes through a standard "opamp" before going to a standard 25 watt "non discrete" IC output stage.

So the whole thing is pointless. Lets assume your input signal is a "low" 2.5 volt. Your output voltage is going to be 14 volts (8 ohm 25 watt). That means you need a gain of like 10 tops.

So that means the signal goes through the 6P1 power tube in a weird buffer mode. Then it goes through the volume control that attenuates the 2.5v signal down to odds are .25v. Then it gets gained up 30x via the 6N1P (along with 10x the noise because you roached 90% of the signal). Then the now 7.5v signal is buffered back down to 2.5v by the Opamp(because the power stage can not handle more than 5.1v in). And finally sent into the output ICs that odds are, are running 20v rail to rail voltage...


A "real hybrid" would have the tube stage doing all the voltage amplifying and have discrete pnp and npn transistors as output/current buffers so you would have a nice low output impedance vs tube, for driving multi driver speakers with complex crossovers.
Can you put that in English?
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#15
Quote from bruit99
:
Can you put that in English?
The thingy neuters the cd quailty sound down to guitar pickup level, then amps the thing up back to cd quailty sound with tubes, then sends the sound to a goldstar/radio shack quality 25 watt amplifier that has the volume control permanently set to 1/4 volume.
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