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The last post was confusing so I deleted it and currently I have it hooked up with the investment of a breadboard.
Keeping it simple is the best way for everyone and the current state of the circuit to start. As I think it's somewhat doing what it should.
MV is currently hooked up like this:
- Pot "o" to wiper of bias pot wiper AND grounded from this lug.
- wiper to 8.2k grid resistor
- pot "x" to the coupling cap
Bias pots are wired like this:
- Pot "o" to ground
- wiper to pot "o" of MV
- Pot "x" to Rk via 6.81k resistor
Rk was doubled from 150R to 300R by putting another 150R in series.
This is what I am observing:
Adjusting either bias pot does adjust a by mere 0.1mV increments but increasing and decreasing. The current draw at test points measure around 25mV and increases by turning to "o" direction and decreases turning to "x" direction by 0.1mV.
I added an 0.1uf cap inline directly from MV wiper straight to the grid pin 2 in series with the grid resistor.
In this scenario one tube draws in all the current to something too large and so I turn the amp off as it reaches this state. The first tube draws hardly any current. Adjusting does not do anything.
When I remove the cap it goes to the initial state I mentioned at 25mVish.
Can anyone explain what is going on? I thought I had it right but the adjustment is so small a total range of about 0.8mV from "x" to "o" and it doesn't make sense that the additional of a cap would cause one tube to keep going up to over 100mV.
Keeping it simple is the best way for everyone and the current state of the circuit to start. As I think it's somewhat doing what it should.
MV is currently hooked up like this:
- Pot "o" to wiper of bias pot wiper AND grounded from this lug.
- wiper to 8.2k grid resistor
- pot "x" to the coupling cap
Bias pots are wired like this:
- Pot "o" to ground
- wiper to pot "o" of MV
- Pot "x" to Rk via 6.81k resistor
Rk was doubled from 150R to 300R by putting another 150R in series.
This is what I am observing:
Adjusting either bias pot does adjust a by mere 0.1mV increments but increasing and decreasing. The current draw at test points measure around 25mV and increases by turning to "o" direction and decreases turning to "x" direction by 0.1mV.
I added an 0.1uf cap inline directly from MV wiper straight to the grid pin 2 in series with the grid resistor.
In this scenario one tube draws in all the current to something too large and so I turn the amp off as it reaches this state. The first tube draws hardly any current. Adjusting does not do anything.
When I remove the cap it goes to the initial state I mentioned at 25mVish.
Can anyone explain what is going on? I thought I had it right but the adjustment is so small a total range of about 0.8mV from "x" to "o" and it doesn't make sense that the additional of a cap would cause one tube to keep going up to over 100mV.
