Looking at the voltage chart in the original Stereo 35 manual, V1 and V4 are the two 7247 driver tubes. The voltage chart seems to indicate that pin # 1 of V1 should be 215 VDC while pin # 1 of V4 should be 230 VDC. How can this be? It's the same pin of the same tube for each respective channel. Is this an error in the manual or am I missing something?