Give Frank Van Alstine a call. He knows the DQ-LP1 well, at one time offering an upgrade for the unit.
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Yes, I’ve corresponded with Frank by email and he says he no longer works on these.
He was generous in sending me the article he wrote on the subject some 30 years ago. I am looking for fresh input, as it were. No disrespect at all, but got the impression that he had little interest in the current project....
@epiii---I got rid of the link I had to the company offering service/parts/upgrades for lots of the Dahlquist products when I sold my DQ-LP1 (I got myself a First Watt B4, a much more flexible active x/o. It sounds like you don't require that versatility for your setup), but a search may bring it up for you. They may be able to advise you.
The DQ-LP1 use a 35mA transformer, to accommodate new opamps with higher current draw, a transformer with 100mA capacity should be adequate.
You can find some low profile transformer like this one and not to concerned with being unable to put the “lid” back on.