antique sound lab HB1 review

Aug 28, 2007 at 9:23 PM Thread Starter Post #1 of 8

jivetrain

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i had a hard time finding information on this amp and i know there are others who are curious about it, so i hope this quick overview will be useful to someone.

to start, the build quality of the amp is great. it's made from a very sturdy feeling metal and there are no loose parts or poorly joined pieces. the volume knob feels great and works perfectly. the blue led on the power unit is way absurdly bright but that's no problem. every part of the amp feels well put together... disregard the fact that it says 'hybird' on the front.

as far as noise goes there's a lot of tube rush, but i found that it disappears when the amp is tilted; i now keep the amp propped up at a 45 degree angle and there is near silence. i don't know why this happens or if this is typical of every hb-1, but regardless it's a problem that i've managed to solve easily and i'm happy with that. the only remaining noise is a low, faint hum that never bothers me when listening. you can't hear it while music is playing nor when there's silence between tracks; i only seem to notice it when i've finished listening and am turning the amp off for some reason.

the sound of the amp is very fluid and smooth; the highs are articulated crisply and are never harsh, and the bass, though a little underpowered, is rich without any muddiness. it's the mids that are the strength of the amp; incredibly pure and liquid sounding. overall it sounds very pleasant and is easy to listen to for hours on end, my only complaint is that the amp is not particularly capable of revealing detail. even with my grado 225's i have to listen very carefully to hear small nuances, which i assume is the cost you have to pay for the smoothness of the sound. still, the edges of the music sound clearly defined even if the lowest level details of the music are not.

i've heard that the amp has little power and needs to be turned up high to reach a decent volume, but i've found that to be false. it could be my grados or my sound system, but i have never had to turn the knob near even 1/4 of the way up to get the right volume. i assume anyone turning it up past that either has inefficient headphones or terrible hearing.

that's about all i have to say, i'm impressed with the amp and it definitely was the best choice for me at the entry level. it obviously surpassed the pro-ject head box i was using before in every regard, although with the $100 price difference between those amps that's to be expected. i admit that i still regret buying the HB-1 and wish that i had saved up a little and gotten the mg head instead, which isn't too much more and would probably yield a much better sound, but the hb-1 is still a formidable and enjoyable amp and i don't mind listening to it for a little while more.
 
Aug 29, 2007 at 10:29 PM Post #3 of 8
Sounds like a great amp for the cost. I have seen it on e-bay once, and was curious. Could you put up a few pics?
 
Aug 31, 2007 at 5:13 AM Post #5 of 8
here you go:
l_a21dd09a0f11c9801df2930c6ba38df0.jpg

you can see the angle it has to be kept at
l_730cc5d3cb9ab06a3b8d89acace3487d.jpg

here's a bad picture of the back
l_8855baef87d217f6c71eec25359855fc.jpg
 
Sep 3, 2007 at 9:05 PM Post #6 of 8
just wanted to add that i only used grados while listening to this amp. it may be confusing for people to read my review and then find this post on the message board-

"It's a tube/FET hybrid, and I wasn't impressed. Firstly, the overall output level is rather low and it barely has enough juice to drive a 650 (and therefore DT880, K701 etc.). Secondly, it's the wrong kind of hybrid - instead of combining the warmth of tubes with the speed of SS, it manages to combine the muddy sound of tubes with the harsh grit of solid state. It's a cute and fun little amp, but hardly great sounding, even at that price"

i'm convinced that the amp is only capable of working well with low impedence headphones. any person reporting poor results so far has been using sennheisers or other higher impedence headphones... so don't do that.
smily_headphones1.gif
 
Sep 4, 2007 at 1:50 AM Post #7 of 8
Yeah, The HB1 is not exactly an amplifier in the traditional sense. It's a headphone buffer, so it's only unity-gain. It's a cathode follower to source follower design, which seems somewhat redundant to me. It is possible to build a tube buffer without a solid-state output (link), or just a plain MOSFET buffer like the Szekeres. The HB1 is probably a better match for low impedance phones and not so great for higher impedance ones.
 
Oct 26, 2007 at 8:43 PM Post #8 of 8
yet another update to this thread; i replaced the sovtek tubes with new TADs and the tube rush is completely gone; i can sit the amp level now as it should be and it's dead quiet. the problem was entirely the fault of the tubes, not the amp. the sound is also becoming noticeably more detailed and i no longer feel like it's lacking in that regard, nor am i interested in finding a replacement anymore. i really love the amp, if you're looking for one in this price range and use grados, i don't know of anything nearly so good
 

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