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In the Forum: Melquiades Amplifier
In the Thread: Planning my DSET
Post Subject: Damn crossoversPosted by anthony on: 1/1/2019
 Romy the Cat wrote:

I think it takes around 60 seconds on my amps. I have 2 minutes delay for high voltage, so it all within the limit. 


That is good to know Romy.  It was quite frustrating when I though I had a major problem in the Bias Supply that I was unable to diagnose.  My power transformer is probably a little smaller than yours and just takes more time to fill all that capacitance.


 Romy the Cat wrote:

Your channel B bias is 13.82V wish is the problem. The tube is closed with such high bias. As you will bring the bias doe to near 4V the tube will open and the plate current will flow. You nned to debug your negative supply chain on channel B


Thanks for your thoughts Romy.  Last night I roughly wired in some random crossovers (the same values as in your schematic) and my troublesome Channel B came closer to the fold.  It now sits at -7.3V bias and is pulling 290V which is at least conducting something now.   This morning I will check again the correct resistor values in that string and then adjust a value so that it pulls roughly the correct voltage.

DSET First Stages 5.jpg

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