Thanks for the tip. I'll give it a try.
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Try switching it back. Does it sound worse? Per BHK himself: “The intent of the bias or tube operating switch was to allow for the use of the 12AU7 and the 6922 family of tubes. For the 6922 types, the current was set for 5 mA and for the 12AU7, 4 mA. It would be interesting to see what you think of the sound when set at 5 mA vs. what you observed when set at 4 mA, the factory setting for the 12AU7.“
I’ve been listening to the BHK pre for over 2 years now so I know it’s sound well. I’ve always used the 12au7’s. After the first 4-5 months I changed the factory tubes to some nos early 60’s Telefunkens and those tubes transformed that preamp into what almost sounded like a new preamp. I was truly surprised at how much better it made everything sound.
I’ve always had it set at the factory 4mV setting. I’ve put on around 2200 hours on the Telefunkens so I know their sound well. After contacting PS Audio just to make sure what I wanted to try wasn’t going to hurt anything or void any warranties, they assured me that it was completely safe to try and to let them know what I heard.
One of of my fiends came over a few nights ago and he asked me, do you want to try the 5mV setting, I said sure, we’re never going to know if it’s better if we don’t try it, so we switched the jumpers.
With regard to earthtones comment of “try switching it back” in this case there is just no reason to do that. The improvements were immeadiatly obvious. We both heard it right away. The slight glare on the flutes was gone. Everything was more coherent. Piano notes had more weight to them. Bass was tighter and more solid. Massed strings sounded smoother and more realistic. I heard all positive and absolutely nothing negative. If you own a BHK preamp and you’ve never tried it before, I recommend you try it, if you don’t like it, you can always switch it back. Based on what I heard, I can’t imagine not leaving it on the 5mV setting. Take care.
- 16 posts total