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In the Forum: Melquiades Amplifier
In the Thread: Planning my DSET
Post Subject: The biasPosted by anthony on: 1/1/2019
Hi Romy,
Further to my earlier message, I've measured the bias voltages for the driver tubes in all Channels.
A -4.3V not adjustable
B -13.82V not adjustable
C -4.8V not adjustable
D -4.2V (ran out of potentiometer travel...may have to adjust a resistor)
E uses fixed cathode bias...not measured this round
F -4.3V (adjustable with pot.)
Looks like something is going on with A/B/C. B is the worst and is the 6E5P that is not conducting (has 400V at the anode). I've not installed the crossover components in this channel yet (the 12.1K resistor and 0.043uF cap to ground) but perhaps I should install something even though the crossover point will probably change...I'd not have thought they would make a difference at this stage.
Regards,
AnthonyRerurn to Romy the Cat's Site