Hi all...
I have some ideas to build a 8 channel mixer. Each channel strip is built with two 12XX7 tube preamp with an EQ with another 12XX7 tube... each channel has a current draw of 11mA so no major worries there.
However thinking about the construction of PSU some concerns are arising. First of all I'd prefer DC for the heaters and I have a a total of 3,6VDC from 24 12XX7 tubes.
Also I'd prefer to use as few transformers as possible for the heater supply.
Using a secondary of 12VAC rectified would make the filtering tricky to create so I was thinking if the "problem" could be solved by using multiple rectifying bridges tapped from a secondary of 12VAC?
Maybe a complete novice question? But what are the facts behind such a solution?
// John
I have some ideas to build a 8 channel mixer. Each channel strip is built with two 12XX7 tube preamp with an EQ with another 12XX7 tube... each channel has a current draw of 11mA so no major worries there.
However thinking about the construction of PSU some concerns are arising. First of all I'd prefer DC for the heaters and I have a a total of 3,6VDC from 24 12XX7 tubes.
Also I'd prefer to use as few transformers as possible for the heater supply.
Using a secondary of 12VAC rectified would make the filtering tricky to create so I was thinking if the "problem" could be solved by using multiple rectifying bridges tapped from a secondary of 12VAC?
Maybe a complete novice question? But what are the facts behind such a solution?
// John