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In Reply to: RE: update..... posted by vinnie2 on May 31, 2017 at 12:41:25
No, the wires don't need to be external. The wires running to the top cap are connected somewhere under the chassis - tags on a terminal strip perhaps. Go from those points to the coupling cap (driver tube) and the 200 ohm resistor, which should be on G2 (output tube). All points along those wires are the same from the origin underneath to the top cap. No need to run those up top.
I think I see what you are saying...bring everything to the top of the resistor that will have the one wire going to the plate connector. I suppose that could work. I never looked at it before because I did not have the resistor hooked to the pin. I will have to look at it carefully to see how it will fit under the chassis, but it would be nice to have only the one wire going from the resistor to the plate connector on the outside. I just hope there is room to do it. Thanks for the tip.
To explain it another way . . . you should have only a single wire going to each of the top caps.
On the driver tubes, your schematic shows the wire to the top cap coming from a 15 henry choke. So, instead of running a second wire from the top cap back underneath to the 0.1 coupling cap, just connect the coupling cap to the output of the choke. In other words, connect the output of the choke to a lug on a terminal strip and then run two wires from the same lug (a Y) - one goes to the top cap, the other goes to the coupling cap.
On the output tubes, the wire from the OT goes to a lug on a terminal strip and then two wires go from the same lug (again a Y) - one goes to the top cap and the other goes to the 200 ohm resistor which is mounted on Pin 3 of the socket.
I guess the choke is used in place of a plate load resistor?
Your explanation was clear, but I guess mine wasn't, because that is what I was trying to say too. At any rate, I may not be able to do it without a lot of disassembly, so I will just have to wait and see how complicated it looks when I pull one of the 813 tube sockets out from the top side. If I can do it without a great deal of trouble I will probably give it a try.
Yes, the choke is used instead of a plate resistor.
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