DG7-6 R99 & R4 - 330K R6 & R8 - 220K (For an even finer resolution, use a 470K for R99, and a 270K for R6) pin board Pin 1 f,K (f,K) - (filament,Cathode), connects to "f " on the board and connect a jumper wire from there to the “K” on the board (wiper of P3) Pin 2 Y2 (m1) - connects to "Y2" on the board next to R8 Pin 3 Y1 (m2) - connects to "Y1" on the board next to R6 Pin 4 A (a1) – Anode, connects to "A" on the board (wiper of P2) Pin 5 X2 (Z2) - connects to "X2" on the board, next to R4 Pin 6 X1 (Z1) - connects to "X1" on the board next to R99 Pin 7 F (g2) - Focus connects to "F" on the board (wiper of P1) Pin 8 G (g1) - connects to "G" on the board next to D4 Pin 9 f (f) - connects to "f" on the board next to the other "f" Voltage test: pin 1 & 9 - filament voltage across these should between 4-6VAC Read all other pins referenced to ground (0VDC) (can use tab on 7805 regulator): PIN VOLTAGE 1 ~-295VDC 2,3,4,5,6 ~+250VDC 7 ~-150VDC 8 ~-299VDC