How powerful is a Wavac MD-300B

Pani,
Okay, now understand your position.I suggested the Wavelength(especially the Signature models) as I know they and Coicident are very upper echelon 300b SET amplifiers that I`m familiar with(both are rare to find used). There are other very good choices also. Best of luck to you.

Charles,

If you are not sure if you will have enough power, maybe consider a different amp. I have a VAC 30/30. It has 2 300b's per side and is quite powerful. I believe its rated at 32 watts per channel. It sounds just as powerful as my old AR VT100. It had absolutely no problems driving a pair of Martin Logan SL-3's for about 2 years. I still have it and have no plans of selling it.

The only reason I am trying for this wavac (even though I also like the more powerful Audio Note) is because there is no other amp I have heard which does things that the Wavac can do. My impression comes from EC-300B.

Pani, a potentially very important point that nobody seems to have noticed yet is that the frequency response spec on the MD-300B has a lower limit of 40 Hz!!!

Assuming that spec is not in error, that would make the MD-300B a non-starter as a candidate, in my book. Besides that being an indication that the bottom octave will be severely rolled off, it is most likely also an indication that there will be adverse sonic effects at somewhat higher bass frequencies, due to phase shift issues.

In contrast, the EC-300B is spec'd to 20 Hz, and also has twice the bandwidth of the MD-300B at its upper limit (100 kHz vs. 50 kHz).

Also, I note that the EC-300B weighs nearly 60% more than the MD-300B, and appears to use completely different tube types in the input and driver stages.

All of which would seem to indicate that the sonics of the two amplifiers are likely to be considerably different.

Regards,
-- Al

Sensitivity of a given speaker is inly one information, even more important is, what kind of X-over is inside? Some can be a black hole for tube amps, even when speaker sensitivity gives the impression, that low powered amps can be used (Wilson is among such examples). Some tube amps are quite robust and have the ability to drive a wider range of speakers than others (Lamm ML2.1 is such an example but between ok and great there is also a difference) but I never heard a 300B amp in its full glory below 98dB speakers...