Given all the answers, so a high power SET amp must use different tubes to at least exceed 20wpc. Kaya kayang gawin dito sa Pinas ito:
deHavilland Stereo 845 Design Specifications:
power output-------------25 watts RMS into 8 ohm per channel
output class -------------Class A
bandwidth ---------------20Hz - 35 kHz
power triode ------------2 X Type 845
driver tube --------------2 X 6AU5
voltage amp -------------2 X 6SN7/GTA/GTB
feedback ----------------Zero negative feedback
input impedance-------50k ohms (Values from 10k to 500k available on request)
residual hum------------Less than 2mv.
warm-up------------------Automatic time delay for long tube life and gentle startup
dimensions-------------18.5"W x 19"L x 10"H
weight---------------------64 lbs