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In the Forum: Melquiades Amplifier
In the Thread: 6 Channel Version of Super Melquiades
Post Subject: How to measure the amplifier input impedance?Posted by Romy the Cat on: 1/23/2008
Can someone help me to calculate the input impedance of the 6-chaenal Milq?
It is cannot be measured as a regular DC impedance as it is affected by the active impedance and the by positive and negative voltages from the bias supply and the bias compensators. Furthermore, since in the Super Milq the bias resistors are combined with filtering resistors, + multiple channels involved then total impedance is a very complex to compute. I was trying to keep the passive impedance roughly the same across the channels (~30K-35K) but how can I determine exact effective impedance of the entire amp taking the bias voltages and the gas tube in perspective? My approximation suggests that it should be around 9kOhm but I would like to know the exact and the confirmed number. I wonder, perhaps is any way to measure the impedance exactly using some kind of parallel or substitute masuring methods?
The entire input circuit if here: http://www.romythecat.com/Site_Images/SuperMilq_6Ch_24.jpg
Thank you, Romy the CatRerurn to Romy the Cat's Site