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In Reply to: RE: EL84 differences nos/modern? posted by riverm@online.no on November 24, 2016 at 03:55:56
This maybe the source of your problem.
Pin 2 is the input grid or G1 . Pin 1 in the early el84 was IC or internally connected. Some, especially, currently made el84 have p1 unconnected in which case it makes it an ideal tie point for the grid stop resistor on the tube socket. I don't know why one would intentionally tie those 2 points together.
I believe the vintage Sylvania have the P1 design IC, in which case the input signal to the tube is not going to the signal grid if in your amp the P1 is used for the grid stop resistor.
Edits: 11/24/16 11/24/16Follow Ups:
Yes, this is what is being done. Your AC signal line should attach to pin 1 of the EL84.
Here's the schemo.
It is very strange, did you see the drawing? I hav now connected the pin two resistor directly to the boar,
Because it seems that you are not too familiar with tube equipment and i would hate it if you connect something the wrong way or the wrong part to the wrong thing and cause a major problem. It is not that hard to do this but make sure you are doing the right thing.
You need to move the 1.5k grid stopper resistor and the wiring from v4,5,6,7 to 4 solder lugs or terminal posts located close to pin 1 of the power tube sockets.
I have connected two and two resistors and each of them to the .1uf cap leaving the 1 pin unused?
,
Your picture may not show how the components are actually connected. Also the tubes are not identified, but it is safe to guess that v4,5,6,7 are the el84. It shows that on the tube socket p1 is used as a connection point for input and also the grid to ground resistor. So, if you want to use the old timey el84 you need to put a solder post off pin l for every tube socket, 4,5,6,7, and move all the wires and resistors that is connected to pin1 onto the solder lugs.
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