i can use the same opt's for the SE. Is this possible?
What about core saturation?
The most common used transformers big enough for EL34's will be push-pull designs. Without a larger air gap, the unbalanced current flow in the primaries will have him working nearer to saturation on peaks. SE transformers do have larger air gaps to allow them to work in an SE design.
Go look in catalogs. Most SE designs will use various tubes, but the 6L6 type is more common than the EL34 types. An EL34 is a true pentode (should be) and wouldn't tend to be used as a triode with the lower plate dissipation and higher heater current. The 6L6GC family has a higher wattage plate (30 W vs 25 W) and has much lower heater current. It just doesn't make sense to use an EL34 for SE compared to some of the TV sweep tubes or the 6L6GC family.
So, going by what you are most likely going to see, the transformer will be p-p.
Now if Joca specifically bought transformers for SE design with EL34 tubes, that is an entirely different story. Then you only have the primary impedance to worry about.
I intend to build the Tubelab SSE with the EL34's because they are mentioned in the building process/options. I didn't know this, aparently, may be a "bad" choice compared to other tubes arround to be used in this SSE design. Please, advise. I am still in the preliminary phase of the building process. Thank you.
I am looking at the edcor CXSE 25-8-5K, the transcendar 15w 8ohm 5K. These are at the same price range. However, i'm not sure about the power transformer to use now and in the future TSE. Maybe the edcor xpwr059? What do you think? One last word from you, thank you all