tubewade said:It would be nice to have a look at your schematic to say for sure. Is it the classic GEC 30 W KT88 schematic? At any rate, you can probably add a second pair of valves for more power out. It will consume twice the current and require half the load impedance if you do that. There may be other things to consider such as bias, too, but it can probably be done.
Another thing to consider is that doing so will increase the cost tremendously, i.e. four valves, bigger output transformer, bigger power transformer, maybe more rectifiers, but will only increase your output by about 3 decibels. Is it worth the cost?
You probably have a point,I thought what I might do is use the original design,and just bi-amp my system by using the tube amps on the mids and highs,and use the pair of SS monoblock amps I have for the low end.
If you use an active filtering setup, the P/P KT88s at 30 watts on the medium and high range drivers should certainly be more than enough power, even if the speakers are fairly inefficient..
if the speakers are 90db/1m/1m and 84-85db/1w/3m you will get 94-95db at 10W and 100db at 40W. More than enough for most applications.
denny9167 said:I have a schematic using a pair of 6SN7's to drive a pair of KT88's in a Push Pull config. it's rated at 30 watts, is it possible to add an additional pair in parallel to increase the power output?