Quote:

To interface to a speaker you must provide:
1. low voltage
2. high current

which is opposite fo what a tube provides.



Both voltage and current are important.

An amplifier limited to a 5ARMS output will deliver 200W into an 8Ohm load regardless of the available voltage. Having more voltage available will permit the amp to drive more power into higher impedance loads (within the current output limit).

An amplifier limited to a 40VRMS output will deliver 200W into an 8Ohm load regardless of the available current. Having more current available will permit the amp to drive more power into lower impedance loads (within the voltage output limit).

I think what you meant to say is that tubes are better mated to higher impedance loads that require "less" current whereas solid state is better suited to lower impedance loads that demand "more" current.