12-16-2013, 05:07 PM
Yes my memory is not so great for details either these days. I was mentioning using industrial type tubes in place of the 6V6GT tubes in my H-K A300 amplifier and instead of writing 7408 I wrote 7409. I went back and corrected the mistake. I try to write things down, and especially commit them to files on my computer which gets backed up frequently. That way I can check myself if I think to.
I did manage to find some 1847 lamps at Radio Shack in Sherman, TX and bought them. The radio had no. 44 lamps in it which take more filament current. The 1847 lamps only use 0.15 or 150ma of current from the filament string in the radio. They would also create less heat too as a result. As an ultimate choice I could always implement LEDs using a protection diode and series current limiting resistor for the LED, but then it would not be very original anymore. I mentioned above about the radio having a 16 ohm resistor instead of a 10 ohm resistor in the pilot lamp circuit. I finally got a schematic that showed that the actual value in a 40-200 model was 16 ohms, not 10 ohms as I read at first. This was due to a poor quality scan of the schematic I was using.
Joe
I did manage to find some 1847 lamps at Radio Shack in Sherman, TX and bought them. The radio had no. 44 lamps in it which take more filament current. The 1847 lamps only use 0.15 or 150ma of current from the filament string in the radio. They would also create less heat too as a result. As an ultimate choice I could always implement LEDs using a protection diode and series current limiting resistor for the LED, but then it would not be very original anymore. I mentioned above about the radio having a 16 ohm resistor instead of a 10 ohm resistor in the pilot lamp circuit. I finally got a schematic that showed that the actual value in a 40-200 model was 16 ohms, not 10 ohms as I read at first. This was due to a poor quality scan of the schematic I was using.
Joe
