In my experience you are right Tony. A while back I was thinking of winding some output transformers using the Pi winding technique. To prove the idea I wound a center tapped anode choke for the 7N7 drivers in my 807ish amp (5B-255M). I used a pretty small C core transformer that came from a current injection rig. The first wind was a dismal failure, I just used normal interleaving. The max frequency was poor due to interwinding capacitance. The second try was split bobbin in two halves also using normal interleaving, this was better but I wanted more. The last try used a bobbin split into six vertical sections, each section had five layers. This choke was nearly perfect and I was quite pleased with it. As a phase splitting tranny it also works very well. The only trouble was I didn't write anything down or take any photos during the wind up. Doh. So I only have one and the likelyhood of making another one the same is slim. I will have a rummage in the junk box and take a photo of it if anyone is interested. Another good thing about this winding method is that although it takes a bit of time to make the bobbin the sections are narrow and there is no need for neatly wound layers.
Cheers Matt.
Cheers Matt.
two ways to do it, first is bifillar in 4 vertical or pi sections, second is 4vertical sections with primaries and secondaries in juxtaposition with each other....the first will be easier to do since you wind both primaries and secondaries at the same time...
quite right, but interstage trafs are not my strong...Wouldn't mind learning though.
Is it possible to make top sounding trafos by ourselfs? or does it take many trial-error-trial-error-trial cycles?
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