I actually haven’t built any — Chris always swooped in an grabbed the kits and returned them built :^)
I do lust after more than a few.
dave
I do lust after more than a few.
dave
Well here is the finished article!! See earlier post #7394
All hand cut/tooled
Looks like it was made to sit on top of the passive preamp. Still have to play around with it in my system etc. and will probably put taller feet or give it a plinth of its own at some point on but happy to have it "ticked off my list" for now!!
Have fun. Stay healthy
C
All hand cut/tooled
Looks like it was made to sit on top of the passive preamp. Still have to play around with it in my system etc. and will probably put taller feet or give it a plinth of its own at some point on but happy to have it "ticked off my list" for now!!
Have fun. Stay healthy
C
Attachments
Yes! I did try to arrange it like a V-Twin but that made it a bit too complicated
Hi All. First I thought about building a F5 turbo and decided that was too much power so then I thought about building a F5, then I realized that this amp is for my desktop system and I will never more than 1 watt so I think the ACA is perfect.
Does this amp do well with a tube preamp?
Does this amp do well with a tube preamp?
ACA with tube preamp
Hi,
I am using an Audio Research, LS25 MKII ,tube preamp. With my ACA monoblocks.
It sounds great in my humble opinion.
I built mine amps using oversized heatsinks, and upped the bias to just over to 2.2 amps per channel.
Getting about 18 wpc into 8 ohms, but I am running 4 ohm speakers, So maybe half that into 4 ohms . I biamp below 125 hz. which helps my 90 db speakers a good bit.
Short answer: Tube preamp is a good match ,at least in my situation.
mg16
Hi,
I am using an Audio Research, LS25 MKII ,tube preamp. With my ACA monoblocks.
It sounds great in my humble opinion.
I built mine amps using oversized heatsinks, and upped the bias to just over to 2.2 amps per channel.
Getting about 18 wpc into 8 ohms, but I am running 4 ohm speakers, So maybe half that into 4 ohms . I biamp below 125 hz. which helps my 90 db speakers a good bit.
Short answer: Tube preamp is a good match ,at least in my situation.
mg16
If you think the 10k Ohm input impedance of the standard ACA may be challenging for your preamp, there’s a modification that will raise it to 20k 😉
Quick, Cheap Linear Supply for ACA
I re-purposed an old Radio Shack 12 volt regulated supply for the ACA. I took out everything except the power switch, circuit breaker and so forth. I put in a 20 volt 5 amp transformer followed by 6, 4100 mfd caps. This sounds considerably better than the 24 volt SMPS supplies I have tried
This is the stereo version of the ACA. The power supply is putting out 23.5 volts under full load to the amp. Bias is set to 12 volts which sounds better than lower settings.
My total cost was $35. Not beautiful construction but sounds nice.
I did not build the amp. Someone else assembled it and I purchased it on eBay.
I re-purposed an old Radio Shack 12 volt regulated supply for the ACA. I took out everything except the power switch, circuit breaker and so forth. I put in a 20 volt 5 amp transformer followed by 6, 4100 mfd caps. This sounds considerably better than the 24 volt SMPS supplies I have tried
This is the stereo version of the ACA. The power supply is putting out 23.5 volts under full load to the amp. Bias is set to 12 volts which sounds better than lower settings.
My total cost was $35. Not beautiful construction but sounds nice.
I did not build the amp. Someone else assembled it and I purchased it on eBay.
Attachments
eliminating the start up "swoop" noise on the ACA
I built the amp, it works fine and sounds good for what it is, I don't trust/like that the initial rising pitch noise it makes when first powered on through the speakers, I'm assuming it's the caps (?). Is there a fix for this ? I'm just using the amp thru "expendable" desk top speakers. The noise isn't very loud but enough that in the back of my nervous/paranoid audiophile mind I think it could damage tweeters at some point lol
thanks
I built the amp, it works fine and sounds good for what it is, I don't trust/like that the initial rising pitch noise it makes when first powered on through the speakers, I'm assuming it's the caps (?). Is there a fix for this ? I'm just using the amp thru "expendable" desk top speakers. The noise isn't very loud but enough that in the back of my nervous/paranoid audiophile mind I think it could damage tweeters at some point lol
thanks