Tube preamp topologies and music

A OP - As to your specific question, single ended 300B amps tend not to be very well controlled in the bass - even with efficient speakers.

A 300B valve is only good for a couple of watts before it starts to distort. A say eight to ten watt advertised SE 300B amp will not deliver that wattage at 1%THD.

So they are not a good choice for rock music.

The following link will give you a good overview of technical issues related to SE amps - a "high powered" one in this case.

There's a Jadis Defy 7 for sale now on eBay for $2636 + $105 shipping from The Music Room in Colorado. Six EL34:s per channel for 100 watts. It looks real nice with black transformer covers and gold chassis!

Tube amps are as subjective as anything in audio, which is extremely.  The most important opinion is yours.  IMHO it's more important to have an amp that works well with your speakers, and sounds good in your room than to try to match an amp to a music style.  Every tube type and brand tend sound a bit different, and they also tend to vary from circuit to circuit, so absolutes are tough to come by.  The preamp that you use will factor into the final sound as well. Either way, there's a lot to like about a good tube amp.  Midrange clarity and depth galore.  

With that said, I agree that a Dyna 70 is a nice starting point.  Legendary amp for the price.  The VTA version from tubes4hifi.com takes things a step further, and is just a wonderful sounding amp....it has some good American iron, a great circuit, and sells new for as little as $995 in kit form, or $1650 complete.  

First of all, I disagree with some of the comments above.  A well-contructed single-ended amp can rock pretty hard with the right speakers.  But the key thing for you is, what kind of speakers do you have?  That's going to determine the amount of power you need, and that in turn will go a long way toward dictating the tube choices.

@gochurchgo I hope I do not upset anyone, as this is very personal for each of us. Every amp has characteristics that could be positive, and/or negative. Speakers, room size/acoustics, listening distance between listener and speakers, music selection and taste, optimum and enjoyable volume levels and of course, other characteristics the individual is wanting. For cheap, I would buy a used Nuforce STA200. At a higher price, maybe a used Pass XA25. Both fantastic, and with horns. There are many more to choose from. I would not go tubes at this point with technology (power amp specifically). BTW, if you appreciate tautness, control, speed, fast transients, rhythmic momentum and less "color", particularly with the lower octaves, these are not the forte of tubes. I am not knocking tubes, as I understand why the love. I left tubes (again power amplifiers specifically) a very long time ago, and the virtues of music and sound reproduction I look for and appreciate, are with great solid state. Please pardon me. My best, MrD.