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Tube Amp for Martin Logan Speakers

Hi, I love tube sound through my Martin Logan Aerius-i fronts and Cinema-i center. I currently have a Butler 5150 which is a hybrid, but it busted on me and would cost $700 to fix. I've had china stereo tube amps that were pretty good and gave true tube sound, but not enough drive for higher volumes. I live in condo, so not like I can blast music anyways but still. I got the Butler because I wanted 5 channel tube sound for home theatre (The piercing sound from my Denon 3801 receiver was not pleasant to my ears). It appears there are only three multi-channel tube amps around, from Mcintosh, Butler 5150, and Dared DV-6C. The latter two are hybrids, and the last one was one of the worst tube amps i've ever heard. I have no clue why 6Moons gave the Dared a 2010 award, but maybe it's because it produces only 65W.

So since multichannel tube amps are hard to come by, and they tend to be hybrid, I was thinking maybe it would be best to get three true tube monoblocks to power my fronts. Thing is I wonder if they will be underpowered for my speakers, and not sure which ones are decent for the price. Maybe China made ones would suffice, and they still go for pretty expensive price. I'm wondering if anybody knows of a decent powerful tube monoblock that is affordable, because I can't pay $3000 per block. or maybe best to just repair my Butler. Thing is, I'm not confident that it is reliable. The tubes are soldered in which is weird, and i've taken it to a couple repair guys who both said that the design is not good, because it's very tight inside and more susceptible to being fried from DC voltage areas. it's too sensitive.

Any suggestions for tube monoblocks, even if china made ones? the holy grail for me would be Mcintosh tube amp, but they are hard to come by. Thanks.

smurfmand70
georgehifi's avatar
georgehifi
10,312 posts
 

Yes Al and that why I say a Quad 57 is voiced around a low power low current tube amp, but with Martin Logan's statement:
"Quote:
However, it is important that the amplifier be stable operating into varying impedance loads: an ideally stable amplifier will typically be able to deliver nearly twice its rated 8 Ohm wattage into 4 Ohms, and should again increase into 2 Ohms." Quote:

This is why my ML Monoliths have very subdued/rolled off character in the uppermid/highs and dynamics when driven from my tube Rogue 120 monoblocks.
Yet they sound perfect and well extended when driven by my big current pushing solid state monoblock amps.


Cheers George
atmasphere's avatar
atmasphere
11,756 posts
 
Yet they sound perfect and well extended when driven by my big current pushing solid state monoblock amps.

'Current pushing'? This sounds like a misconception to me.

Again, Martin Logan is specific about the amplifier to use with their speaker because they have made the speaker so hard to drive. 0.5 ohms is hard on all amps, not just tubes! What you want to consider is how the amplifier distorts when presented with a low impedance- and in this case, **all** amplifiers, tube or solid state, will have higher distortion which will result in brightness.

I suspect this is why Paul Speltz got a letter from Steve McCormick, wherein Steve described how even though his amps can drive 4 ohms effortlessly and with double the power of the 8 ohm load, the fact was that they sounded better (smoother, greater detail) when using the ZEROs to drive the same load.

The simple fact is that you don't want an amplifier to work hard- it will have greater distortion which is to say it will sound harsher and with less detail.

George, you should give a set of ZEROs a try with your Rogue amplifiers. I think you will find that by using them, they keep up with your solid state amps in the highs. That is the experience of many people using the ZEROs. The ZERO website (http://www.zeroimpedance.com) has many comments in that regard.
georgehifi's avatar
georgehifi
10,312 posts
 


I've had a pair of Zero's given to me, to me they are a band aid fix for an amp that not right for the speaker it's being use on, and the disadvantages far outweigh the advantages.
Your far better off getting the right amp for that speaker.

PS: I gave the Zero's away as well.

Cheers George
mapman's avatar
mapman
22,097 posts
 
This thread is a rerun.
tsushima1
1,165 posts
 
I have to say that my own expearience of the Zero's into ML CLX's would seem to parallel with MrLoFi's, given the many favourable endorsements on line I was most surprised to find that IMHO the Zero's rather than opening up the presentation produced the opposite effect within my system
( Configuration and polarity checked and double checked for user error)
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