My little amp

Time for minor maintenance and cleaning on the little, yet mighty stereo amp, now in charge of Gotorama with its “impressive” 3,5W per channel

After cleaning, I took the time to make some evaluation of alternative double triode tubes to Heinz&Kaufman 5998 - i. e. Western Electric 421A, Telefunken 6080W and GEC A1834, both rounded and straight brown base.

Will be a new winner after the actual king, the WE421A?

Stay tuned....