Hello Im just starting to work with valves but have a question on the power supply side. The question is the amplifier I am building needs 300 VDC. As I understand voltage after bridge rectifiers across the smoothing capacitor increases. The transformer I have is 660 volts AC center tapped 120 milliamps.
The amp requires a single ended power supply. The multi meter shows 330 volts AC no load. but where I bought the transformer it says 290 volts ac and it could power the tubes Iam using. But the real question is will that voltage come down under load on the AC side and the DC side.
Im not sure if 330 ac is to much for the tubes. So what I was wondering if I needed something as low as 250 Volts AC. Then that would go up after rectifier and capacitor.
The bottom line is what ac voltage do I need to convert to dc 300 v. Is it the same or is the ac part lower ?
Also what would be the best way to wire the center taped output to get the most current out of the transformer because I only need one x 300 volts supply. The diodes I am using for rectification are 1n4007.
Im confused with this RMS and peak power. I know peak is higher and do the caps need to be at the peak voltage. The caps are rated at 450 volts The tubes Iam using are 6v6s and there will be 2 of those to make a stereo amp. There is also 2 x 6j5s which are driver tubes. A total of 4 valves will be used. The SE output transformer is 5000 ohms so Iam not sure if there is enough current. Would a larger capacitor and choke compensate the current demand at peak power?
sorry if this is long but any help would be much apreciated.