Triad FP40-300 wiring question

[doctord02]

In an earlier thread, I asked about ways to come up with bias voltage in a 4xKT88 bass amp I am building, and someone suggested I use a Triad flatpack transformer. So it looked about perfect and I ordered it... Now I'm getting ready to wire it up and I'm confused with the directions for wiring up the secondary...

http://system.netsuite.com/core/media/m ... 7&_xt=.pdf

The document that shipped with it says to wire it in series to get 40V center tapped, I should connect taps 6 to 7 and taps 5 to 8...

So where is my center tap? Can someone thats wired one of these or something similar give me a clue? I plan on using a full-wave rectifier to generate a negative voltage of ~ -56V which should give me enough range to bias up the 4 KT88's...

[da Geezer]

The document that shipped with it says to wire it in series to get 40V center tapped, I should connect taps 6 to 7 and taps 5 to 8...

That would be parallel......for series, connect 6 & 8 together & those then become your CT.....5 & 7 then become the supply connections.

[doctord02]

Thanks, thats what I was thinking based on the illustration. The wiring text instructions are just wrong apparently.

[Jana]

They still haven't fixed that? I worked with those transformers 20 years ago and the diagrams were wrong then.