Rerurn to Romy the Cat's Site
In the Forum: Melquiades Amplifier
In the Thread: Bias help
Post Subject: Coupling capacitorPosted by Romy the Cat on: 2/4/2014
fiogf49gjkf0d
Daniel, if you have start, the igniting voltage, on the gas tubes 197V then it is perfect. If the tubes do maintain stable 150C then leave it as it. Each of the gas tribes has own stabilization voltage. If one of them has let say 148V and another 150.3V then you might have not enough turns in your adjustable resistor to set the input voltage to zero, So, juts change one of the gas tubes or switch them between each other. As you will set the gas tube and lock the operational parameter it will be good for many years.
The high pass filter for Milq is very simple. As “decoud” said the coupling capacitor is a first order high pass filter. Set it for whatever frequency you want. If you need sharper filter, let say second order then you can drop a coil from grid to ground, introducing another first order via RL filter. I would not do it and use just filter in coupling capacitor and if you need more than I would do it at speaker level, you do not run DSET and all your filtration at speaker level. The coupling capacitor filter will be nice to protect the OPT from any LF saturations.
Rgs, RomyRerurn to Romy the Cat's Site