Are Triad HS-52 gapped?

[Murdock]

Title says it all.
I've read a post from our transformer guru CJ where he says that a Triad HS-52 is not suited for single ended operation because of the nickel core.
The spec states a max DC current of 12.5mA when wired in series (20k) and 25mA when wired in parallel (5k).
Does it matter if it is used in a push pull circuit or single ended as long as the max DC current is not exceeded? No matter if it has a gap or not?

 

[beatnik]

The gap would be required for a single ended direct feed with DC current through the primary, but a transformer without gap can be still used single ended with parallel feed configuration - plate load resistor (or choke) and coupling cap blocking DC to the transformer.
Compare for example RCA Ba2a and Op-6 schematics to see the two different configurations

 

[Murdock]

Thanks. But I know about para feed configuration. I would like to know, if a transformer designed for push pull operation can still be used in single ended when the max dc current is not exceeded.

 

[lukas]

I hearing something about permalloy core gapped is not profitable...

 

[CJ]

I think I might have been a little generous with the 52 alloy, usually outputs are 50/50 alloy.

The 52 print says Lap 1, which means 1 lap this way, 1 lap that way, so ungapped. Used in push pull circuits like Fairchild and pultec eqp 1a.



https://groupdiy.com/threads/triad-transformers.74167/

 

[Murdock]

Ok, thanks! So that rules single ended out.
But what about the dc current spec of the HS52?
In the EMI RS124 compressor for example is a current of 14-15mA through the center winding of the output transformer.
Is the 12.5mA spec of the HS52 for center fed current? Or max imbalanced current?