05-13-2022, 06:36 PM
Hi Hamilton,
No offense taken! No problem!! I misread your numbering. I am scheduled for cataract surgery next week.
Take 2!
I do think you have the wires switched.
In your picture, the connection labeled #3 is the junction that I described between the output transformer primary and the field coil. This is the connection that the wire to the 8uF cap, the 6F6 Pin 4 and the B+ bus should be connected to. In your text, you say that the red wire connects to the 8uF cap, the 6F6 Pin 4, et al, and the yellow wire is connected to the 12uF Cap and Rectifier cathode. If this is the case, swap connections. Connect the red wire to Point 3 and the yellow wire to Point 2
For a 5Y4 Rectifier, the filament is the cathode. This is referred to as a directly heated cathode. The use of the term filament or cathode are both correct.
Let me know if this helps. If not, I can draw a pictorial, but it will take me time, as I will have to scan and e-mail. I am retiring, but still working, getting eye surgery, have Church commitments, have to put grab bars in a bathroom for an elderly neighbor and have to fix my car, all this weekend and upcoming week, but will be happy to do the drawing if you need it. As they say, a picture is worth 1000 words (or 4000 of my words).
BTW, the other 2 wires coming out of the field coil are known as the "hum bucking coil. This is in series between the output transformer secondary and the speaker voice coil, and is phased to e 180 degrees out of phase with any AC component in the field coil.
Best Regards,
John, MrFixr55
No offense taken! No problem!! I misread your numbering. I am scheduled for cataract surgery next week.
Take 2!
I do think you have the wires switched.
In your picture, the connection labeled #3 is the junction that I described between the output transformer primary and the field coil. This is the connection that the wire to the 8uF cap, the 6F6 Pin 4 and the B+ bus should be connected to. In your text, you say that the red wire connects to the 8uF cap, the 6F6 Pin 4, et al, and the yellow wire is connected to the 12uF Cap and Rectifier cathode. If this is the case, swap connections. Connect the red wire to Point 3 and the yellow wire to Point 2
For a 5Y4 Rectifier, the filament is the cathode. This is referred to as a directly heated cathode. The use of the term filament or cathode are both correct.
Let me know if this helps. If not, I can draw a pictorial, but it will take me time, as I will have to scan and e-mail. I am retiring, but still working, getting eye surgery, have Church commitments, have to put grab bars in a bathroom for an elderly neighbor and have to fix my car, all this weekend and upcoming week, but will be happy to do the drawing if you need it. As they say, a picture is worth 1000 words (or 4000 of my words).
BTW, the other 2 wires coming out of the field coil are known as the "hum bucking coil. This is in series between the output transformer secondary and the speaker voice coil, and is phased to e 180 degrees out of phase with any AC component in the field coil.
Best Regards,
John, MrFixr55
"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
Best Regards,
MrFixr55
