I'd like to upgrade tubes on my Mastersound Compact 845 SET. I'm getting a loud buzzing noise from both channels at listening position which I find extremely annoying. My current tubes are Shuguang 845C (cheap Chinese electron). Pre amp tubes are Tungsram ECC82 and driver tubes 6SN7 EH. Probably all cheap stock tubes. I Love the the sweet sound but noise level is unacceptable. Also very audible transformer noise, but I doubt there is a fix for that. Are there other ways to minimize tube/transformer noise?
What are the most reliable aforementioned tubes out there and what is the best place to get them? Upscale audio seems to have quite a selection. PSVANE was also recommended by some. I would prefer not to spend more than $600 on 845 tubes and hoping for reliable clean sounding tubes all around. I also have C2600 preamp with stock tubes. Any advice on those?
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