I got a 12AU7 based preamp this week made by Von Gaylord, but I am not 100% sure.
I've been told that it was made back in 1993. I cannot find any information on this preamp, but I've decided to jump on it based on its simple design. It's my assumption that it has very high output impedance, I had went ahead with a Burson AB-160. Visually similar LAD-L1 has output impedance of 5k.

The preamp is very quiet and offers clean & big sound stage.
My current idea is to tryout some different capacitors by installing a pair of terminal blocks.
Here are some pics.

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JRA