This is my first post here. However, I am a member in other forums and enjoy this hobby as much as the majority of you folks out there. I just want to share some impressions I shared with another member in another forum follow by some pics! I also want to mentioned my speakers are Magnepan mg12s with outboard crossover. The preamp is a BAT vk-30 and a Yulong D-100 DAC. Moreover, currently I am using only two output tubes per amp and a Weber wz68 rectifier.
I've done just a little bit of listening. So far I noticed when listening in triode the amp is not as loud but it sounds more natural and real. To me, the difference in both male and female voices are just a bit clearer in triode but it also has less bass with pentode being more punchier. I will report back when I get to do more listening.
So far everything is excellent! I don't listen loud so I might leave it in triode. I use two subwoofers so if there is some bass lacking the subwoofers will take care of that. The bias is spot on!
After some more listening I found the speakers sound more dynamic in pentode mode and preferred them that way. However, after few more days of listening the high frequencies were starting to sound unpleasant and all over the place. Nevertheless, I know how placement picky magnepan speakers are. I recognized the issue and attributed the unpleasant high frequencies to the placement of the speakers. I guess the frequency response from a solid state amp and tube amp are not the same? But anyway, I started playing with the placement and after some toe in adjustment everything is now just beautiful!!!! I listen at around 70 to 74 dbs and I don't feel the need to crank it anymore as I feel and hear what I like at those levels. In addition, I haven't try to play music extremely loud. In another note, these amps are super quiet!
This was my first amp build ever and I would like to suggest that you take your time and follow the instructions Step By Step!
These past couple of day I have found myself switching back and forth from pentode to triode and I think is fantastic to have this option. I listen to all music genres but particularly Classic Rock, Vocal Jazz and Spanish Salsa as well as Latin Jazz.
Last edited by pedrocols on Mon Aug 10, 2015 12:00 am; edited 1 time in total