A this point there was a hum (or two) present in the background. I just plucked the E string repeatedly while jumpered to this 12" alnico speaker. The pickups my 80's Kramer Bass guitar sound great already, even though i plsn on adding 1 or two more gain stages to the preamp on this project. Having everything shielded under a proper chassis will go a long way toward reducing hum, parasitics, etc.
*Don't try this at home!!!!*
Nevertheless, the intensity of an EM field drops off with the inverse square of the distance. Also, there is no high gain feed horn on use,. lastly the Plate tranformer is only running 90v input rather than the full 140vac offered by my metered Variac.
Something misunderstood by many, is that a microwave oven and its Magnetron tube cook food via vibrating molecules with Radio Waves, not Atomic Radiation. It doesn't "nuke" your food, with Alpha, Gamma, or X-Rays.
This is 2.4Ghz Continuous Wave RF. Still quite unsafe in the near field, to the human eye as well as other tissues.
This video is an update on an ongoing project with ham friend Dan - KD2YND, to design a Class A 1x6L6 Bass Guitar amp, with a 6SN7 voiced Pre. In this video I discuss the suitability of a steel chassis I found for the point to point soldered circuit. Also shown, is my modular 1/2 12ax7 preamp that has successfully driven a 6V6/6L6/5881 in other experiments.
My single ended 6V6 amp is finished and working great. I rewired the power supply, keeping the filter caps further away from the signal path. I also added a 5H Choke, which completely cut the 120hz hum I had been experiencing with this amp.
Previous iterations of my Single ended Class A driver were running the 6L6/6V6/5881 etc. in Triode mode, by tying pin 4 (Screen) to the plate (Anode) through a 100 Ohm resistor.
For this test, I added another node to the plate supply so that I could supply a voltage that was dropped from B+ (about 335vdc in this test).
The amp was much louder in Pentode mode, although I need to adjust some component values to really get in the proper performance curves for these tubes.