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Amp Camp Amp - ACA
Amp Camp Amp - ACA
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Old 21st June 2018, 11:39 PM   #4691
Extreme_Boky is offline Extreme_Boky
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Quote:
Originally Posted by Soundhappy View Post
I do have similar experience with Diy M2 amp gain=15dB.
Your ACA is the first 14 dB version no doubt.
I can use passive AVC , audio source = 2V without active preamplifier.
My speakers are 98 dB efficiency.
With less efficient speakers 88 dB I do need active preamp imho.
New ACA 1.5 have only 10 dB of gain....

Anyway BA-3 is not constipated by the feedback loop
R12 is around 68K on the latest diagram; 39.2K on the original diagram. New ACA can only have more gain, not less...
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Old 21st June 2018, 11:58 PM   #4692
Soundhappy is offline Soundhappy  France
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Quote:
Originally Posted by Extreme_Boky View Post
. New ACA can only have more gain, not less...
How much of dB ?
You can verify by youself on the left ACA V1.0 on the right side new ACA 1.6
source : http://www.firstwatt.com/pdf/art_amp_camp_1.pdf
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Old 22nd June 2018, 01:31 AM   #4693
ThermalAlchemy is online now ThermalAlchemy  United States
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Default Help with choosing subwoofer amplifier to companion ACA

Like a child on Christmas morning just received one of my two chassis go to ACA 1.6 sitting on top of my original amp camp amp chassis I modified from a old mini computer chassis and just attached heat sinks to that side of it.
Been using the Krong tube as a preamplifier along with comparison the DarkVoice 336 SE and IFI micro Black Label as preamp.
It appears if you wanted to you could mount the Krong PCB inside the chassis of the amp camp amp.
Even the original Amp Camp Amp 1b PCB pictured below is more than enough power then you can comfortably listen to with the BK-20 Fostex speaker cabinet kit using them Fostex FE206En drivers. I will use my original ACA 1b. To drive the tweeters Fostex T90A ( that’s just for the family members who can hear both 15K+ , my hearing starts rolling off at 12k and stone cold death after 15K.) and the new 1.6v ACA to drive the Fostex FE206En Full range. Now just need to build a amp for the subs.
Somebody with experience any recommendations for a subwoofer amplifier, maybe (Honey badger, F5 or F6 Turbo?.) For now will be driving two 12 inch subs.
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Last edited by ThermalAlchemy; 22nd June 2018 at 01:33 AM. Reason: Misspelling
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Old 23rd June 2018, 09:05 AM   #4694
Spencer Brandsen is offline Spencer Brandsen  Netherlands
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'It appears if you wanted to you could mount the Krong PCB inside the chassis of the amp camp amp.'

Yes, I want that. But what's a Krong tube preamp?
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Old 23rd June 2018, 09:29 AM   #4695
MEPER is offline MEPER  Denmark
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It looks like a Korg Nutube:
Nutube – English | korgnutube.com – English
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Old 23rd June 2018, 10:06 AM   #4696
Spencer Brandsen is offline Spencer Brandsen  Netherlands
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Thanks, MEPER, you're right. It's a hybrid headphone amp with Korg Nutube. Did anyone try a preamp with Nutube in front of an ACA?
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Old 23rd June 2018, 10:18 AM   #4697
twocents is offline twocents  South Africa
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Amp Camp Amp - ACA
Quote:
Originally Posted by Spencer Brandsen View Post
'It appears if you wanted to you could mount the Krong PCB inside the chassis of the amp camp amp.'

Yes, I want that. But what's a Krong tube preamp?
It was probably the B1 using the Korg Triode referred to here, as this B1 has some gain. See post Amp Camp Amp - ACA - it looks like a kit is on the distant horizon.

I am currently running my ACA with a B1, but found (like others here) that the ACA really shines with an active preamp. I think this B1 with the Korg could make a great pre for the ACA, and would be great if someone can report on how well they pair.

PS: Spencer - sorry, my post was shortly after yours - I did not see that.

I also see now that ThermalAlchemy's preamp is a Pete Millet Korg preamp. Wonder how that drives the ACA?

Last edited by twocents; 23rd June 2018 at 10:27 AM.
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Old 23rd June 2018, 12:07 PM   #4698
ThermalAlchemy is online now ThermalAlchemy  United States
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Quote:
Originally Posted by Spencer Brandsen View Post
'It appears if you wanted to you could mount the Krong PCB inside the chassis of the amp camp amp.'

Yes, I want that. But what's a Krong tube preamp?
Sorry (Korg NuTube) I was driving and using voice to text when I made post. Definitely Get the tube sound. I only get it ringing if you tap on the case.
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Old 23rd June 2018, 12:32 PM   #4699
Spencer Brandsen is offline Spencer Brandsen  Netherlands
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In that case: don't tap on the case.
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Old 24th June 2018, 06:59 AM   #4700
irishpatrick33 is offline irishpatrick33  United States
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Quote:
Originally Posted by ThermalAlchemy View Post
Sorry (Korg NuTube) I was driving and using voice to text when I made post. Definitely Get the tube sound. I only get it ringing if you tap on the case.
Everything I have read suggests the Millet Nutube preamp is incredibly microphonic. Makes me wonder whether Millet got an early batch that happened to be microphonic. Or are the Nutubes inherently microphonic?
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