Hello All,
I am new to the forum, but have been dicking with Fisher tube gear for many years. After a 10 year hiatus from critical listening, I decided to break out a 500c I restored years ago. Performing voltage checks after a slow voltage power up to 115, I find that my grid voltage is about 400 with 375 being the target. Also, I am looking to target the bias to around -20 and am around -17 presently.
I have not been able to find a schematic that goes beyond s/n 49999 on the net. After looking at my brother 500c with a serial number below the 49999 and comparing it to mine, there are differences in resistor values.
Anyway, anyone have a schematic for these late models?
Thanks,
Rob
I am new to the forum, but have been dicking with Fisher tube gear for many years. After a 10 year hiatus from critical listening, I decided to break out a 500c I restored years ago. Performing voltage checks after a slow voltage power up to 115, I find that my grid voltage is about 400 with 375 being the target. Also, I am looking to target the bias to around -20 and am around -17 presently.
I have not been able to find a schematic that goes beyond s/n 49999 on the net. After looking at my brother 500c with a serial number below the 49999 and comparing it to mine, there are differences in resistor values.
Anyway, anyone have a schematic for these late models?
Thanks,
Rob