I guess I have to subscribe to the common opinion about the solid state / tube contrast. The ACA is clean, lively, dynamic while the Inspire is relaxed, musical, pleasing. But this contrast is different than I've thought of it in the past. I think the difference is in Class A vs. A/B or later. That easy on the ears quality exists with both. I can't say that one is better than the other, but I can say I am enjoying the hell out the ACA monos!
Kimi says he's lookin' pretty good for an old guy.
jeff
Kind of like me!
Fugly!
and Andy is cute boy
Thanks, I think.....
Very nice build. Loved it.PASS ACA amp camp amplifier project. diyAudio Store's ACA kit for 8w monos and a pair of 24v torroidal power supples. Chassis based on the power supply boxes, raised with heat sink from diy for the amp stage. Silver hookup wire in the signal path. Poplar faceplate and top with tea soak to bring out the grain and add black to the brown (it really works!) then Minwax ebony stain and gloss poly.
Thanks to all here for the help along the way for this total newbie. The sound is really way above what I expected. I did this to learn and just get a bit of a sense of the First Watt sound. Impressed with the stock build, I moved to a 24v switching supply. The sound improved noticeably. So I went for the linear supplies. I didn't expect to make these keepers, but they surely are!
And say hi to Andy, our 13 year old Rottweiler/German Shepard mix.
I'm also planning to build a wooden cabinet for my diy amps.
Could anyone please share any thoughts on fixing phono RCA socket onto 19mm plywood?
Thanks,
Saikat
Sent from a handheld device. Some typos may creep in.
Try these out. Should make it easy to mount to plywood.
Neutrik NF2D-B-9
Neutrik NF2D-B-2
I bought mine at Parts Express.
I am getting ready to mount stuff to my heatsinks, should I use Loctite or are lock washers sufficient? If Loctite, what color do people prefer?
Also, in pictures on the build guides there appears to be oversized washers on the bolts for the mosfets. Probably stupid to ask if they are necessary, as I'm guessing they wouldn't be there if they weren't. Are they for extra heat dissipation or mounting security?
Thanks,
Doug
Also, in pictures on the build guides there appears to be oversized washers on the bolts for the mosfets. Probably stupid to ask if they are necessary, as I'm guessing they wouldn't be there if they weren't. Are they for extra heat dissipation or mounting security?
Thanks,
Doug
I don't use loctite, just split lockwashers. I figure they give "spring loading" to accommodate thermal cycling as well as keep the nuts from loosening. I use the split lockwashers and those Nylock nuts that have inserts which keep them from loosening which is probably overkill.
The big fender washers are to distribute the load clamping the MOSFETS to avoid damage. They aren't necessary probably if you don't overtighten the bolts , but exactly what is overtightrned?Nelson uses them in his amps so we do too in the kits. You do need some type of washer though.
Mark
The big fender washers are to distribute the load clamping the MOSFETS to avoid damage. They aren't necessary probably if you don't overtighten the bolts , but exactly what is overtightrned?Nelson uses them in his amps so we do too in the kits. You do need some type of washer though.
Mark
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Never mind. Went back to the store description(https://diyaudiostore.com/products/amp-camp-amp-kit). They are M3 threads.
-D
If you are asking me, yes. Super Alnico Monitors in a four way active (quad amped) system. You can see my thread over at Omega Circle: Peter's Super Alnico Monitors with matching powered woofers.
You might skip ahead past all the planning stuff to see the result. There have been further changes, but this gives you the idea.
.
All the parts should have arrived while I'm out of town (already completed the board), so I'll be assembling and (hopefully) firing up the ACAs this weekend. I'll run with the 19.5v / 6A Dell power brick for now, but may do a linear supply using an σ11 PSU board and 24VDC toroidal transformer for ***** & giggles.
-D
-D
I am building an ACA with two large heatsinks. Each sink has two aca boards with a look toward trying each pair of boards bridged to power my Altec 605B open baffles (16 ohms). I have built a PS box around a Meanwell se-350-24 module (14.6 amps at 24VDC).
It works fine connected directly to the amps, but, because it might be good to isolate one bridged channel from the other a little bit, I put a 20 mhy coil on the PS output followed by a 15K ufd cap. The coils are Erse SuperQ with .554 ohms resistance. The power supply comes up then drops down fairly quickly and then shuts down. I took the coil out of the circuit, and all works well with just the cap. So I doubt it has anything to do with short circuit protection in the Meanwell. Are there any trick that might prevent this seeming instability with the coil in place?
Thanks,
Skip
It works fine connected directly to the amps, but, because it might be good to isolate one bridged channel from the other a little bit, I put a 20 mhy coil on the PS output followed by a 15K ufd cap. The coils are Erse SuperQ with .554 ohms resistance. The power supply comes up then drops down fairly quickly and then shuts down. I took the coil out of the circuit, and all works well with just the cap. So I doubt it has anything to do with short circuit protection in the Meanwell. Are there any trick that might prevent this seeming instability with the coil in place?
Thanks,
Skip
As I am lazy and don't want to read all 300+ pages in this thread while I'm on vacation, are there any other changes that need to be made when you switch from 19VDC to 24VDC? Do you still set the bias to see 10VDC on the middle pin of Q1?
Thanks,
-D
ACA better then F5 ??
I agree starbender....my first impression with F5 is that ACA sounds much better even though it is just 6W per channel and F5 is 25W...after setting 0.6V bias on output resistors @ 25V using a 300VA transformer...but I thought it was only me who felt it this way..
I am going to build a BA3-FE and then reconsider my view...
I agree starbender....my first impression with F5 is that ACA sounds much better even though it is just 6W per channel and F5 is 25W...after setting 0.6V bias on output resistors @ 25V using a 300VA transformer...but I thought it was only me who felt it this way..
I am going to build a BA3-FE and then reconsider my view...
No J111 replacements....
just when I started to have hopes....
@ mbrennwa
Look post 105 of this thread : Zen Mod share a 30v variation
2sk170bl received today
Every things is OK now .... Q1 drain set to 11.50V (VCC 23.0V). Tested with fountek fe85 in iBIB enclosure : the sound is really intesresting. Now I can start the O2
Conclusion : j111 is not a remplacement for 2sk170 in this build ...
Thanks again to every for the help (and Mr Pass for this design)
just when I started to have hopes....