[Syrah]

Perfect.  Thanks. So could/would I put,

- one 7 amp circuit breaker on each hot leg, or one 3.5 amp on each hot leg;
- the circuit breakers on the 120-0-120 end or the 60-0-60 end?

I would think the 120-0-120 end would sound better since whatever damage is done to the signal gets the trannie to fix it, as opposed to the 60-0-60 end.  But as is clear from my question - I am NO expert.

Thanks again guys!

[Occam]

Syrah,

As you surmised, a [<=] 7 amp on each of the hot legs of the (defacto) primaries, those that are fed the 240vac housepower.

Regards,
Paul

[Syrah]

Hi Guys.  I finally wired this up.  My fuses blew as soon as I threw the switch.  I suspect I either wired it wrong or it's a defective trannie.

To be clear, the "0"s on both the primaries and secondaries are all wired up together and grounded.  Then I fed the 240 taps with 120-0-120, hoping to get 60-0-60 out of the secondaries.  No such luck.  Should the "0" on the primary or secondary end not have been grounded?

Thanks!

[Speedskater]

OK download this white paper from Middle Atlantic:

http://www.middleatlantic.com/pdf/PowerPaper.pdf

Go to page 21 for the correct wiring diagram.

[Syrah]

Thanks for this!  So on the 120-0-120 primaries I need to connect the 0s to each other.  Then on my secondaries I need to connect and ground the 0s.

So only the secondaries 0s are grounded.  My mistake was grounding both.

[Syrah]

Alright.  Well I've been blowing fuses all over the place trying to wire this properly.

I called Signal.  They said to wire it in series on both the primaries and secondaries, which should solve my problems.

So on the 240 primaries, I connect one O with one 240, and hook my two hot 120 lines to a 240 and a 0.

Then on the 120 secondaries, I connect one 0 with one 120 and ground both, then tap the other 0 and the other 120 to get 60-0-60 out.

Any objections to this?

Will it still give me technically balanced power out?

What would have happened if I connected and grounded the two 0s on the secondaries and tapped the two 120s instead?
 

[Syrah]

I just read this from an online tutorial,

"Antiphase wiring will not harm a transformer when wired in series (although the zero volts output for equal windings is somewhat limited in usefulness). Parallel antiphase connection will destroy the transformer unless the fuse blows - which it will do mightily. Always use a fuse when testing, as a simple mistake can be rather costly without some form of protection for the transformer and house wiring!"

Is this what I did wrong the first time?  Since my primaries and secondaries were reversed, should I have put the hot 120s on the two 0s and connected the two 240s to each other?

[Speedskater]

Syrah, did you solve all your wiring problems?

[Syrah]

I did thanks. Occam set me straight. Thanks again Occam!

It sounds great. I have the trannie powering two PS Audio P300s that I use to power my pre-amp, phono stage and sources. 

The 120-0-120 from the wall stepped down to 60-0-60 with the SU-3 (in reverse) seems to produce additional clarity to everything as compared to the 120 from the wall converted to 60-0-60 with the DU-2.  I'm not sure whether its because of common mode filtering from the 120-0-120 line, a bigger trannie, lower impedance, etc.  But it definitely sounds better.