My master thesis is finally done! I finally have time to post until I start working... next tuesday.
First some news: the Castanet is discontinued. Hagerman might still have some PCB, but it's been removed from his website.
It's my favorite.
About the Crack and the 5998 tube. I tried switching the 6AS7 for a 5998A I just purchased and, frankly, it's terrible. The highs are pushed even higher, and for me it's just completely unlistenable.
I've tried my other headphones (Beyer DT770/600 and Sennhieser HD600) and, though it may come as a disappointment to some, it's basically the same stuff I've written about the AKG 601. So let me reiterate:
- MiniMax: Neutral to the point of sounding boring sometimes. Not very refined: instrument separation, soundstage and texture can be lacking. I can't hear the diference in volumes in the songs which my other amps easily reveal. Rember, that's in comparaison to my other amps: it's still, a good amp, especially for a starter DIYer.
- Speedball Crack: Hoter than neutral, the cymbals can be overwhelming and cover the rest of the instruments. It can make certain songs iritating. Bass can be a bit bloated. Good soundtage, good separation, good impacts. If you don't mind the brigthness, or can adjust for it, it will come close to the Castanet for a fraction of the price. The Speedball upgrade is worth it, as it helps bring up the bass a bit. The temptation for tube rotation can be strong (and costly).
- Castanet: It might be a bit dark, but it's nowhere as noticeable as the brightness of the Crack, and it might be an effect of A/Bing with my other amps. Great separation, soundstage and texture (especially the bass). I can detect the slightest variation in the music's volume. It's the only one that can actually give me goosebumps on certain songs. You have to push the volume pretty high for high impedance headphones or orthos. Unfortunately, it's no longer available.
Up next, if it works when I first plug it in, the EHHA revision A!