colin86325 wrote:mazeeff wrote:
Are you saying that pin 1&8 of the front left el34 goes to pin 8 of both the left & right bias ports? If so, this explains the need for the switch! Also, can you confirm that each of the EL34's has a 15.6 ohm resistor? When it comes time to bias, you will need to set the bias to 1/2 of the normal 1.56v. .78v for 50ma, or .62v for 40ma. I have a similar setup, but no front/back switch.
On the front left EL34, pins 1&8 go to pin 8 on the left bias port only. (It does not extend to the right side bias port.)
Each EL34 has actually two 15.6k resistors in series (so 31.2k resistance). Will this change my ideal bias voltage?
Thanks for the help! Once I get this business figured out I think I will be ordering the VTA driver board.
15.6K????. it should be 15.6 ohms. Two of them in series would yield 31.2 ohms, and would put a 50ma bias back at 1.56V! The pictures, do indeed look like they are in series.