Bottlehead Kits > Mainline

Prototype Mainline on e bay

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Strikkflypilot:

--- Quote from: Doc B. on February 23, 2016, 12:22:59 PM ---It is a 6C45 based headphone amp, but not really a Mainline. Too many differences (I would not call them improvements) to call it that.

--- End quote ---

Thanks for the clarification, Doc.

Paul Birkeland:
I actually built this some years ago.  It roughly splits the time difference between Doc B's big headphone amp with the wood front and the current Mainline offered today. 

mcandmar:
I'm also really curious about that tube in the shield, is it a rectifier tube?

Paul Birkeland:
Yes, I was experimenting with small form factors, which necessitated the use of a power transformer with a little more voltage than I wanted.  One way to shed some of that extra voltage was with a rectifier tube.  (Hence some of Doc B's comments)  I have absolutely no recollection of why I put a tube shield around a rectifier tube, but it may have been in part to keep it in the socket while transporting the amplifier. 

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