• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Single ended transformer as pushpull?

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If you look they are already answering the question.
 
. . . is to use the correct transformer in the first place . . . on expensive Lundahls . Common sense !!!
Well, I agreee with you that the Lundahls are expensive. But common sense depends on the intent and cost to do it. Jim already have the SE version but needs a PP version.

A mod will reduce resell price of the Lundahls. To someone who has the tools, understand the requirements and does not need to resell the OT, the mod is simple and cost practically nothing. Someone who has access to a machine shop may even choose to drill the welding points and tap the base to make a bolt on fastener.

It is very difficult to resell and will cost ~$700 to buy a new pair of LL1620 down here in Indonesia, but cost $15-30 to have the mod done by a professional.
 
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