On Thu, May 21, 2009 at 5:00 PM, Joerg <joerg...@analogconsultants.com> wrote: > Chris Albertson wrote: > > [...] > >> I'm thinking about tube amps that had an output impedance of about 1M >> ohm that used transformers to drive 8 ohm speakers. About a 100,000 >> to 1 ratio. >> > > 1M? What kind of tube was that? I think the highest I had was about 5K. > At 5000 volts on the plates ...
OK off by "just one decimal point". My point still is that tube amps have to deal with a huge impedance mis-match and they handle it with a transformer. Then you ask "what transformers can handle a load that is well under 1 ohm. So I thought about arc welders. While on the subject, I'm wanting to build a tube amp. But my goal is not to re-create an old design. Mostly for entertainment and education I want to design and build the transformers too. Anyone have any leads or links to places to buy the parts? I know you can buy frames and the metal plates used to stack a transformer core but where?. I'd start by building something small and easy, like a low power 12V power supply but the goal is to learn the art of high power transformer building -- ===== Chris Albertson Redondo Beach, California _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user