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In Reply to: RE: Finally ........... it's done. posted by vinnie2 on May 30, 2017 at 08:28:03
Ok, before making any changes I want to make sure I have it straight this time. I have gone back over the posts and suggestions and this is what I came up with.
1. Per Tre', the 200 ohm resistor needs to be moved to as close as possible to pin 3. The wire from the resistor will still have to go externally to the plate connector on top of the 813 as there is no connector for the plate on the tube socket.
2. The other wires will still all need to be external to the plate connector on the top of the tube because there is no connection to the plate on the tube socket.
The plan is to get the resistors placed correctly, and then I will measure the operating points for voltage and currents to see where we are there.
Does that sound right to everyone?
Follow Ups:
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?
Edits: 05/31/17
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.
Edits: 05/31/17
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