musika
Well-known member
I'd like to add power indicator lamps to my pair of Fisher 50PR tube preamps. They were taken out before I purchased the units. Some one has suggested that I use a "stereo mode switch with shielded section" in lamp housing so as not to induce added hum in the circuit due to taking the 6.3V (for the #47 bulb) from the transformer. Is this necessary? Do I need to take extra precaution or can I use just an ordinary bayonet mount with the #47 bulb? Attached is the schematic for the Fisher 50PR.