I need help please to recocnize value of resistor on 9pin el84 valve. The amp have 3x ecc83 and 2x el84. Pin 9 resistor is burned and i don't know the value. Can anyone help me please.
The value is probably the same as the one just to the left, going to the screen grid (G2) of the other EL84. The color code suggests 470R, so why not measure it just to make sure. Also measure the burned resistor.
Also, what amp is that? There may be a schematic for it.
jeff
Also, what amp is that? There may be a schematic for it.
jeff
Welcome to diyAudio :^)
You will get better response if you post your query in the Valves forum.
dave
You will get better response if you post your query in the Valves forum.
dave
The burned resistor will be 470 ohms.
The mis-matched resistors are grid stoppers; it looks like whoever built the amp used a couple of resistors they had that were 'good enough for the job' without worrying about them being the same.
Yes, the other resistor is a grid stopper and isn't critical. They may have adjusted the value for layout.
Note that carbon composition resistors are non-inductive. So a wire-wound might be a poor choice.
Note that carbon composition resistors are non-inductive. So a wire-wound might be a poor choice.