Tube synth diy

IT is variable from 1 to 3000 volts really acurate. its all regulated 
and it uses two 8608 tubes. if some one could tell me what the 
purpouse of the 2 tubes are that would be great. but the rest is just 
solid state. It only goes to 20 m.amps after that it just starts 
turing opn and off the high voltage out put. Is that high e nough in 
the amps to be usefull for many tube projects?oh and i paid 25 dollars 
for it