• Re: 6V6 Parafeed with "Robin Hood" iron. - eelind 22:51:05 06/23/04 (0)
  In Reply to: Re: 6V6 Parafeed with "Robin Hood" iron. posted by G on June 23, 2004 at 20:00:41:

  Hi Gavin,

  The work is in progress.I've ordered the parts from Mike, should arrive within 6 weeks. If you want , I can send you the modified design in your e-mail. Just be sure it won't be confused with any spam...And so you can correct it.

  So, We are working on this idea to put 475V as B+ on the 6V6. Should work, and so we can get rid of one cap, one choke , one res and have the 5687 directly connected with the 6V6...Kind of LofftinWhite design.Of course, The cathode resistor of the 6V6 will have to be changed. Fast calculation gave 4,375K/10W . And we put a cap // with te 5687 cathode res.

  Tough part now, if I go this way is the PSU.Gilbert Preyale and I are working on it, but since I m pretty busy, I can't spend too much time on it. I can send you the scanned design in progress, but without values, since they are not calculated yet.

  To give you a hint, we should work with a main transformer giving 2 HV secondaries. One about 600V for the 475V B+, the other for the 175V (or is it 170 ?) goig to the 5687.

  So...It's going a little crazy, but "le ridicule ne tue pas" as we say in France. Picture this:

  Stereo block with separate power block. So far, so good.

  The PSU:

  TRX-HV#1-valve#1-L-C-L-C-----B+
  -HV#2-valve#2-C-L-C-L-C------b+

  Of course, some resistors here and there, (but preferably there :-)), just before we get B+ and b+.

  Is it reasonable ? My answer is NO! absolutely not...
  If we build it, I let you imagine the PSU box...Gonna look like Brasilia. Or some grunge XmasTree...But who cares?

  The fact is that I have in my junk box some chokes comming from ORTF, the former French national broadcasting company. I'm sure Bas Horneman will love this PSU idea...

  cheers.

  Eric
  
  

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