0 Members and 1 Guest are viewing this topic. Read 1824 times.
Strange, I don't seem to have the same experience as some that have posted. A given tube can sound both good and bad depending on what associated equipment and more so what speakers are connected to it. I've had a little better than a half dozen 300bs (SETs and push pulls) through here over the years and haven't found any of them to be syrupy sounding or lacking decent bass. Granted, install a veiled sounding coupling cap or employ some weird derivation of a proven circuit and you'll likely experience issues but stick to what works and you shouldn't have problems. More than anything, watch what speakers you try to mate to SET (or even low wattage PP) amps. Go to Gizmo's (Triode Guild) website and read Heart of Speaker Darkness. It is a good primer for the proper mating tube amps to speakers.http://coneyislanddreams.com/Tri/june/Darkness.htmlI agree regarding the WE 300b and the new production tubes aiming to sound like the WE. To my ears, and in my systems, these tubes are so midbass and midrange forward that it seems that the treble is rolled off (the bass isn't that great either). I personally don't like that sound but I can see where some might find it seductive. Myself, I run the Sophia 300b Meshplates in the Wellborne DRDs. For those unaware, the DRDs have one resistor in the signal path, thats it.... no caps, no chokes, just two tubes, a resistor and then the output iron. The DRD is the cleanest amp I've heard and totally absent of veiling or or ill-defined bass.Regarding the 6L6, I've only heard them as a PP design. Much like any other tube amp around, mate them with quality coupling caps, resistors, decent iron and you can make a fine sounding amp. If memory serves, the 6L6 in PP does about 25-30 watts. If my memory is correct and it were my money (or design), I'd use the EL84. You get almost as much wattage, the tubes are less expensive, there are more NOS available (if you go for that sort of thing) and the EL84 has a 'tone' that really lends itself to music. Its my personal favorite tube, but thats just my opinion, YMMV.
300B sounds so much better than 6L6 there is no comparison! There shouldn't even be a discussion if we're talking about sonics.
Quote from: NagysAudio on 29 Sep 2008, 01:05 am300B sounds so much better than 6L6 there is no comparison! There shouldn't even be a discussion if we're talking about sonics. I generally disagree, and would say that this varies much by implementation. A 6L6GC in triode gives up a little power compared to a 300B - but the real magic will happen when used as a proper beam pentode. A KT66 or 6L6 in a unity-coupled configuration, a la McIntosh, requires slightly more voltage drive than a 300B, but offers comparable damping and lower distortion, and much greater efficiency. The tubes cost an order of magnitude less than WE300Bs, too. I am working with a friend on an amp design using this approach, and it measurably outperforms any 300B push-pull amp that I am aware of, even without global feedback (0.02% THD at 1 watt, ~5-100kHz bandwidth, using a $70 output transformer). The driver is perfectly capable of driving a 300B into oblivion, so we may eventually invest in a set plus OPT for comparison - however, I fully expect the unity-coupled 6L6 to be equal or superior at a fraction of the cost IMHO, beam power tubes are tremendously underrated for no good reason.
For those of us without much technical knowlege and for education only, how would this approach differ from say the Sid Smith, Craftsman/williamson approach which also used the kt 66.
"IMHO, beam power tubes are tremendously underrated for no good reason."If I were to make an educated guess, it would be that 6L6's and similar tubes are/were being used with poor circuits. There are good circuits out there, but people remember the poor ones. I have listened to several unremarkable amps made over a wide time spectrum.
Page created in 0.192 seconds with 27 queries.