On deck is a pentode/ Ultralinear direct coupled amplifier that will be available in KT77 or 6AQ5 tube type. Power will be 4 or 8 watts but you would never guess…
The two power tubes are ones I just cannot choose between. The KT is detailed, muscular and full, energizing the room in a way that a memorable personality does. The 6AQ5 is sweeter, balanced – more timid and childlike.
The target is a small amplifier in an efficient package that performs at an unusual level. The front end is a small pentode, selected for drive and high gain. In this configuration, the driver section is designed to operate without phase distortions being introduced by capacitor bypassing on the cathode. With enough gain, no bypass is necessary. Purer sound results from keeping music’s phase relationships undisturbed.
Testing vacuum rectifiers…