- Jan 22, 2008
Yes. The HT issue is not complicated; you need to measure the voltages along the RC filters.I'm thinking that these should be treated separately?
I don't see how that would change since these points are ar the same zero voltage. And what's wrong with the measured values? that was expected.Should the heater DC 0V reference be at least level with chassis ground? If so, maybe grounding at the -ve leg of C6 instead of centre tap of supply would bring this up?
Yes. Be aware that iy will probably result in slightly higher ripple.I imagine an adjustment to the filter resistor values would take care of the 0.5V that I need to get to 6.3VDC.
That looks good to me Stephen, leave it be at 6.35V.
Would this be the XLR output, with EQ on bypass?Next, I would hook up the output from the make-up gain amplifier, without the eq/filter network in front etc, and check the noise, or lack of noise as the case may be.
Would this be the XLR output, with EQ on bypass?
Should I get the HT voltage up to the right value before doing the output test?
I can't answer that, as I didn't get a HT voltage reading before installing the rectifier. The readings I'm getting now are down about 45V at the PS output. I might have to replace the motor run caps so I can get to the resistors in the PS.So you're saying that, with your DC heater now at 6.35V, your HT voltage is not the same as it was when you ran on AC heater?
Sounds good, thanks.For simplicity's sake, maybe remove the centre-tap ground connection and attach the circuit ground to the negative of C6 too.