Hi all, well this BHK tube rolling has certainly been interesting reading so far… I have learnt a lot about tube rolling from all the experiments and trials so many of you have been doing, and perhaps also as much about the different effects on various systems and personal tastes!
I’m from Perth Australia (Yep, G’day mate… no bloody shrimps on this barbie) …had my BHK pre for about a year. I couldn’t be more more pleased with my purchase, in my book a master class of a pre amplifier design and build. A keeper. Hats off to you mr King, and PSA.
I was told on purchase that the BHK pre was originally voiced on the Tungsram PCC88 / 7DJ8 NOS tubes and to acquire some asap once the unit burnt in, so I bought two sets of balanced and cryo’d tubes from Tube monger.
This was my experience, on my system in my listening room;
As with everything in life, striking a balance is a trade off… some recordings are dark, some are bright. What I found is that the stock Psvane 12AU7’s seemed to handle just about anything I threw at it with control and poise. As many observe the top end is a little rolled off, however with good interconnects I found it presents fine high frequency detail…albeit in a supple manner.
After a few month of sleep deprivation due to being drawn in to long listening sessions, yes hard to walk away from my system… I decided to install the Tungsram’s Id purchased.
Anticipating a more open top end, that is exactly what I got, wow… almost crystalline and incredible spacious mid and top end… 50 hrs later after minimum burn in it was time to really delve in and see where it was at now;
As reported on this forum by some before It didn’t take me long to notice on the downside that the mid range and upper bass had been somewhat stripped of its body, or if you like; had become leaner and of a seemingly smaller scale.
I also noticed the bottom end was not as as authoritative and controlled as the stock PSvanes, although still delving very deep. Perhaps more off putting for me on my system was the fact that any thin or slightly bright recording sounded fatiguing, but in essence the overall effect for me was to not go on listening, sleep restored
Remember folks for all the recommendations out there, tube selection is mostly taste and system dependent.
For me in my current system the stock tubes are working their magic and I’m very happy… but perhaps with different speakers in future I may need to refer back to this informative forum!
Enjoy the music …
PSA P3 - isotek premier leads
PSA - DSD with Bridge 2
PSA - BHK pre
PSA - M700 monoblocks
Modified Technics 1200mk2 - Ortofon MC20 cart
Dynavector P75 mk4 Phono line stage
All on Isoaccoustic isolation pucks
Analysis plus silver apex interconnects
Analysis plus Oval 9 mesh speaker cables
Rhythmic audio 12SE sub
Axis voiceboxes - stand-mount speakers