split vs. center tapped input output transformers

I'm getting my head around this transformer thing, CJ et als recent posts have been great great great but one thing hs me a bit stumped.

Is there any reason i can't use a center tapped input or output transformer
where the design calls for a split?

I've got some triad a-57j line to line 50/250/600ohm to 50/250/600ohm
30 to 15000hz +15dbm transformers that seem like good candidates for an 1176.

I also have some utc a-21s 50/200/500ohm to 50/200/500ohm
30 to 30000hz +15dbm transformers.

I think I'll try these out for sure, but I'm curious about the what and why.

Thanks
Kelly

most of the time a center tap is just an internal splice of coil A with coil B.

so it is the same as a non center tapped transformer that has two windings with all four leads brought out.

in the later, they are simply giving you more options for hookup.

try those 1:1 's and report back immediately.

Thanks CJ, That's what you taught me. Just a little low on experience and patience for redoing things.

I'm in the process of placing my standoffs and figuring out where to mount things right this minute. That's why I wanted some amount of confirmation. I still have to wire up all the switches before i can test these.

I'm making 2 stereo 1176s, so i think the triads on the front end (mostly because i have 4 of them more than anything else) and on 1 pair I'm going to put utc a-21s on output.

The other stereo 1176 I going to try a few different things...
Here's what I have to try out

UTC h-25s 500 to 500/125 split
Freed 32035 made for scully 600split to 600 split
AND, I think just out of curiosity I'll have a listen to the nib UTC w-786's
these are 600split to 600 split but they are only rated from 300 to 10,000 cps at 15dbm

I' will report back when they are done, and i think I can host some photos now that I changed my server.
Expect to hear something in a week or 2, just depends on the amount of time I can find for this.

Later and thanks for the info.

Kelly

Sometimes "split" windings are bifilar, in which case it's not exactly equivalent to a centertapped single winding.

Hi Dave CJ et al.

Just a few inferences here from what I've read around these parts.

The reason I ask is I'm kind of a surplus nut. It's part of the DIY thing that I really like. Me I'd rather end up with an 1176 "style" compressor that sounds great and I scored some interesting transformers... The anxiety of trying to replicate a "vintage" unit is simply too much for me to get my head around. Does it sound right? It feels like Bertrand Russel kicking me in the head.


So a bifilar would probably have the 2 windings running side by side in the winding process right?


Now this seems to make sense in that you could hook this up in parallel for higher levels/lower saturation point. but if your single winding is +15dbm, you may not need that extra load capacity anyways.

Splitting, signal out, and meter out off one trafo. O.k, I can only do this with a bifilar.

what else though?

:?:
If I were designing something from scratch, or more likely, designing something that would work cool and make use out of some bitchen surplus find, when would you choose a split winding and when would I want a center tapped?

I'm so close to not being confused anymore that it almost hurts :thumb:

Kelly

You need a CT for push-pull circuits.

Or two coils. Then you can create the CT by joining a hot and a cold.
DCR could get unbalanced, depending on xfmr, but for line level,, we no care, eh?