Hi guys,
currently I'm designing a class AB2 PP amplifier working with two pairs of GU-50's. The operating point will be the one in the rightmost column at page 9 of the Telefunken EL 152 datasheet. My PSU only provides 290 Vdc for the screen grid supply, though. In order to increase efficiency by decreasing the tubes' internal plate resistance, the supressor grids will be fed from +12.6 Vdc.
The datasheet doesn't read values for the screen grid resistors and especially not for the suppressor resistors, as this isn't a very common way to go. Which resistor values would you recommend, please?
Best regards!
currently I'm designing a class AB2 PP amplifier working with two pairs of GU-50's. The operating point will be the one in the rightmost column at page 9 of the Telefunken EL 152 datasheet. My PSU only provides 290 Vdc for the screen grid supply, though. In order to increase efficiency by decreasing the tubes' internal plate resistance, the supressor grids will be fed from +12.6 Vdc.
The datasheet doesn't read values for the screen grid resistors and especially not for the suppressor resistors, as this isn't a very common way to go. Which resistor values would you recommend, please?
Best regards!