.375 is the value I use - the same as .38 as a practical matter. You can go a bit higher without trouble. Or lower.
- there is some initial drift from cold values as it heats up.
Anyway, what you have is normal, just trim it by halves after some warmup time, and again later until it settles in, and then leave it.
- there is some initial drift from cold values as it heats up.
Anyway, what you have is normal, just trim it by halves after some warmup time, and again later until it settles in, and then leave it.
Thanks for the replies. I guess the problem is that there is some variance in my room temp and I cannot help that. I have 3 basic modes (and corresponding amp temps). Temp in the room probably ranges from 69 - 74 or so.
As long as that is fine at the highest the voltage drifts (.37), I'd say it's good to go! And honestly, it sounded best when it was really hot and up to the .5A bias!
- A/C on high = .26v
- A/C on low = .30v
- no A/C...just fan = .37
As long as that is fine at the highest the voltage drifts (.37), I'd say it's good to go! And honestly, it sounded best when it was really hot and up to the .5A bias!
Many Thanks to Nelson once again. This little amp is so much fun! I’m astonished at how good it sounds, but not entirely surprised because… Nelson.
105db speakers can certainly let this lil amp stretch its legs. I hid a P089ZB filter under it.
105db speakers can certainly let this lil amp stretch its legs. I hid a P089ZB filter under it.
Attachments
In case anyone is casting about for connectors to use with existing banana-terminated speaker cables, and also want something that will go well with the Mini's petite theme, I'm very happy with these very slim banana-only female jacks. They accept up to 14ga stranded wire in the solder channel; 14ga also just fits in the Mini's wire blocks. I made these pairs up as pigtails, about 9" in length, which is a good distance to keep the existing speaker cables from pulling on the Mini.
They are available on Amazon (search for B083Z1ZBDV) and inexpensive.
They are available on Amazon (search for B083Z1ZBDV) and inexpensive.
As mentioned the first day...my initial impression was that it didn't give up much (if anything) to the the P-channel V-fet. Upon listening more, when this thing is hot...its 95% of the way there. There isn't quite as much "spooky" 3d factor going on as with the V-fet, but VERY close. And for something that takes less than an hour to put together and costs about 100 bucks...you can't go wrong! In my setup (highly inefficient speakers at 82db, but near field), it can go as loud as I could want. Haven't tried it downstairs in the main setup, but for a desktop system it's supreme!!
I agree with your assessment. For the money, you can't beat it!
This is the perfect little amp for a work station or perhaps a guest room in your house. 🙂
This is the perfect little amp for a work station or perhaps a guest room in your house. 🙂
For me nothing does everything the vfet does, however with the jumper out, the mighty little mini ACA that could, does sorta have some of that vfet sound. It definitely can do the spooky wide floaty neg H2 thing. Swapping the jumper in and out while listening is a pretty drastic difference in sound. This little guy is VERY enjoyable!
