928GTS
500+ Head-Fier
- Joined
- Sep 29, 2006
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So I finally got around to using one of my YAHA boards and I've got it all together and it works....nearly. The issue I'm having is that the sound out of the left channel is quite faint whereas I just hear a hiss out of the right channel. The interesting bit is that if I take one of my hands and place it on either the tip or ring of either the input or output jack and then take my other hand and place it on one of the tube pins I'll get sound in one of the channels though with some of the pins it doesn't sound like stereo sound for that channel. For example if I touch ring and tip on the input jack and pin 7 with my left hand and pins 3 and 4 with my right hand I get stereo sound through the headphones.
I need to work on getting my heater voltages down as they're a bit too high. I'm using the LM317T along with a 6GM8 tube which is a pin for pin analogue to the 6922/6DJ8. Below are my voltages as well as photos of the circuit.
Pin 1: 6.09V
Pin 2: 0.04V
Pin 3: 2.40V
Pin 4: 9.40V(too high,I need to increase the resistor size for the LM317T)
Pin 5: 0.04V
Pin 6: 5.06V
Pin 8: 0.04V
Pin 9 and 7 are not connected.
Pictures:
Twisted orange wires coming towards the camera are the + voltage supply.
Close up of input jack.
Tube socket wiring close up,pin 7 and 9 are not connected.
PCB underside(I lifted a pad or two by mistake but all of the connections test well for continuity)
Circuit overview,red alligator clip is + power lead whereas white alligator clip is - power lead.
Top circuit board view.
I need to work on getting my heater voltages down as they're a bit too high. I'm using the LM317T along with a 6GM8 tube which is a pin for pin analogue to the 6922/6DJ8. Below are my voltages as well as photos of the circuit.
Pin 1: 6.09V
Pin 2: 0.04V
Pin 3: 2.40V
Pin 4: 9.40V(too high,I need to increase the resistor size for the LM317T)
Pin 5: 0.04V
Pin 6: 5.06V
Pin 8: 0.04V
Pin 9 and 7 are not connected.
Pictures:
Twisted orange wires coming towards the camera are the + voltage supply.
Close up of input jack.
Tube socket wiring close up,pin 7 and 9 are not connected.
PCB underside(I lifted a pad or two by mistake but all of the connections test well for continuity)
Circuit overview,red alligator clip is + power lead whereas white alligator clip is - power lead.
Top circuit board view.