Begining parafeed experimentation around the SEX amp: "cheap thrills"

[tbbenton]

I want to start playing around with low cost parafeed designs (cheap iron, and CCSs instead of chokes).  I plan to compare using my SEX amp as reference, and use the 6dn7 tube since I already have a few.  I ordered the Edcor GXSE10-8-5K to include a series feed in my tests.  Now, can I wire this transformer up as an autoformer to run it in parafeed as well, or will the gap defeat this application?

Thanks in advance for any thoughts.

[Paul Joppa]

It will work fine in parafeed, but you will lose the advantage of high inductance (reduces tube distortion at low frequencies) so the comparison with parafeed will be flawed.