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    Ebay tube amp caveat emptor


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    Post by DarthBubba on Wed Jan 27, 2016 4:45 pm

    Not a Dynaco product, to be sure.  You've likely seen these on Ebay; don't think of them as a way to "get started into vacuum tube audio"

    The relevant part starts at about one minute & twenty six seconds, but I encourage watching it from the start.

    URL in case you have to go that route:

    Be careful out there.


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    Post by GP49 on Wed Jan 27, 2016 8:10 pm

    I'm sorry he didn't show us the puny car stereo ICs that are probably being used in the output stages.

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    Post by wildiowa on Wed Jan 27, 2016 9:17 pm

    This is the exact amp I received as a Christmas gift and referred to in an earlier post. I got the "Monoprice" hybrid tube amp, as it is called. About $140.

    I was disappointed as I knew right out of the box it was gonna be weird, but felt for my generous but technically-challenged brother, who bought it. Right out of the box it had a smoked tube, but fortunately I had a pair of old 6BQ5's (EL84) I threw in and got sound. I also ordered two Russian 6N2P (6ax7 equivalents) from The Tube Store and I think that further improved the sound as I originally heard it with the Chinese tubes in. Or was I just expecting the improvement??

    Bottom line I replaced all the tubes and it puts out sound. It is strange and probably worthless but it was a gift so I'm trying to find a place for it. I pulled tubes while it was operating to see if they were totally bypassed or otherwise bogus and the sound stopped, so they are somewhere in the circuit. I saw the video and he pretty much trashed it I think it probably ends up going through some kind of Class D amp for the power side. I also think they bump the voltage on the 6N2P's to make them glow brighter than necessary to give that tube glow....wild stuff.

    I just don't think you are going to get into anything really tube, vintage or new, for less than $500 or $600 and probably more than that unless you find an estate sale or a fluke at Goodwill. A real tube amp for like $140 was just never, never going to happen.
    j beede
    j beede

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    Join date : 2011-02-07
    Location : California

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    Post by j beede on Thu Jan 28, 2016 12:47 am

    A Magnavox 197/597 single ended EL-84 stereo "console" amp will provide real tube sound for $100-200. Add an Apple Airport Extreme as a wireless streaming "preamp" for another $50 or so.

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