2. amps-preamps
  3. 132310-91258

For tube sound, which is more important: preamp or power amp?

I have always loved the “tube sound” - warmth, midrange, soundstage. Through the years (since about 1975), I have owned many tube and solid state amps and preamps, in various combinations. Presently, I have a tube amp and a solid state preamp. But like most of you, I am thinking of making changes, again.  Not to cloud the discussion, the specific brands are not important.  I also listen to acoustic music, females vocals, love mini monitors, EL34s, NOS tubes, and don’t care that much about bass.  So you can see that my taste fits the tube sound very well. But I have had systems that are too warm, not enough dynamics or details, and fat in the low end, too.

okay, now to the discussion.  To produce the tube sound, which is more important: the preamp or the power amp?  Let’s talk in general, and (if possible? May not be) not tied to one specific piece/brand/model of equipment.  I know there are exceptions to any general rule.  Not sure if it makes a difference to your comments, but I have no phono and am running line stage only.

As an attempt to prevent the conversation as going in a big tangent, let’s assume equality of price/quality. i.e. not comparing a $10k power amps contribution to a system to that of a $1k preamp.  Let’s also assume that the amp (tube or solid state) can drive the speakers just fine, such that compatibility does not limit the decision. And ignore mono blocks versus stereo amp differences.  

two follow ons: I have  the perception that preamps give you more bang for the buck - meaning that it takes less money to get a great tube preamp compared to a great tube amp.  Agree/disagree? And second, I have never owned a tube dac or CD player, and will assume that tubes in either of these is less critical than in a preamp or power amp. Agree/disagree?

i am interested in your thoughts.

Bill
meiatflask

Showing 1 response by mulveling

mulveling's avatar
mulveling
2,154 posts
 
Either combination can give you a great dose of "tube sound". Of course power tubes need more maintenance, and the NOS flavors of large power tubes quickly approach $$$$/unobtanium territory. BUT there are really excellent Russian power tubes made today (KT120, KT150), and tube amps will often have at least a few crucial small-signal tube slots for you to get your NOS on.

On the preamp side, higher gain tube preamps are more likely to cause noise issues your system (i.e. tube rush and/or microphonics excited during playback) than SS preamps or tube power amps. That bears consideration. Also, with a tube preamp feeding into a SS power amp it’s a bit more common to experience an impedance mismatch (i.e. high output impedance into a low input impedance, which throws away gain and caused significant FR aberrations), than with SS pre into tube power. Research potential pairings before proceeding, just as you have to research any power amp’s ability to drive your speakers.
More to discover