Here is how they are grouped:

1) Most transformers are available as Push-Pull or Single Ended.

These have:
the same price, same dimensions
the same part number, but the suffix is "PP" for Push-Pull, and "80" for a Single Ended 80mA

2) With Single Ended, all types are basically the same, apart from the maximum DC current. Be aware that high DC current and high inductance you can't have both. So if you choose to much DC current, you will loose too much inductance. We encourage you not to over-rate the DC current. Lundahl has already 15% hidden headroom in the DC Current specification, plus margin is included in that to allow maximum AC signal, and still have the 15%. So all SE transformers will work distortion-free at maximum signal, and the maximum DC current at the same time. For the rest, all SE types of one part number are all the same. So you will have LL1623/90, LL1623/120, etc. These are the same apart from the DC current and Inductance.

3) Lundahl transformers are available as pre-wired types, and as multi impedance types.

4) The pre-wired types have only one input impedance and one output impedance.

5) The multi-impedance types have three input impedances and three output impedances, which gives many combinations, or wiring schemes, that are given in the datasheets. You don't need to understand how these work. Just pick the wiring scheme for your desired input impedance, and desired output impedance, and that's it.

6) Going to higher impedance will give lower maximum output power, as you can see in the below table. Since tubes have the same effect, this matches nicely, and the power limitation will always be the tube, not the transformer.

Is it difficult to design your own MC transformer box? No!

Here is a screenshot from the LUNDAL MC cookbook. This is not a printed book, but these are a few pages of information, you get on CD. It tells you the basics of how to design your own MC Transformer, and it has also an Excel program for some calculations.

Attention! The below is a PICTURE only. When you order the MC transformer cookbook, it is on the CD as well. This Excel program is in German and in English, the MC cookbook is in English. The order number + price you find in the prcielist.