11-29-2011, 10:52 PM
OK, I found #111, not where it should be and way out of spec, like 220ohm instead of 25,000 so I changed it out and put it back by the bakelite condenser.
I do have feedback when I touch the top of the 6r7 and I went one step further, the 1 meg resistor in the tube cap circuit that wnet nowhere, well it should go to resistor #111, I did that and my pin #3 voltage on the 6r7 went from 45 volts to 89 volts(spec is 70v) and it did not kill the static like before. Should I be concerned now that the voltage is 10 - 20 volts higher everywhere if the negative bias is pretty much at spec?
Grid voltage still holding at -25.5 by the 6l6's
Static can be controlled by the volume and treble/selectivity but bass compensation has little to no effect. We are making great progress!!
The 20 ohm resistor (your#133) has seen a lot of heat at one point, (all the paint is burned off still checks decent 24ohms), I have a 33ohm would it hurt to put that big of one in?
And yes -25.4 on both 6l6's, voltage on the plate of both tubes are now 300v and at pin 4 they are at 312volts.
Bob
I do have feedback when I touch the top of the 6r7 and I went one step further, the 1 meg resistor in the tube cap circuit that wnet nowhere, well it should go to resistor #111, I did that and my pin #3 voltage on the 6r7 went from 45 volts to 89 volts(spec is 70v) and it did not kill the static like before. Should I be concerned now that the voltage is 10 - 20 volts higher everywhere if the negative bias is pretty much at spec?
Grid voltage still holding at -25.5 by the 6l6's
Static can be controlled by the volume and treble/selectivity but bass compensation has little to no effect. We are making great progress!!
The 20 ohm resistor (your#133) has seen a lot of heat at one point, (all the paint is burned off still checks decent 24ohms), I have a 33ohm would it hurt to put that big of one in?
And yes -25.4 on both 6l6's, voltage on the plate of both tubes are now 300v and at pin 4 they are at 312volts.
Bob
