I now have owned two of the BHK preamps. The first developed a noisy left channel after about three years. long story but i ended up with a new one and it developed the same issue, but worse, in about three months. it is not tube related as i have swapped tubes and even used different ones (and changing the jumpers as needed). the noise is even audible through headphones so that rules out the amps.
Has anyone had issues with this and if so, do you know what caused it (as I have no clue) and what was done about it. It is truly perplexing as i know i cannot be only one that has had this issue.