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Amp Camp Amp - ACA
Amp Camp Amp - ACA
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Old 6th April 2018, 02:02 AM   #4041
Zen Mod is online now Zen Mod  Serbia
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Amp Camp Amp - ACA
you can try ........ and if it works , use it that way until you sorte pair of proper ones
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Old 6th April 2018, 02:20 AM   #4042
nzlowie is offline nzlowie  Australia
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Quote:
Originally Posted by Zen Mod View Post
you can try ........ and if it works , use it that way until you sorte pair of proper ones
Cheers Zen.
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Old 6th April 2018, 01:53 PM   #4043
zikinho is offline zikinho  Croatia
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My take on ACA.
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File Type: jpg IMG_20180405_152119.jpg (60.6 KB, 595 views)
File Type: jpg 1.jpg (42.0 KB, 593 views)
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Old 6th April 2018, 01:58 PM   #4044
Zen Mod is online now Zen Mod  Serbia
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Fugly!

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Old 6th April 2018, 03:01 PM   #4045
6L6 is offline 6L6  United States
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Amp Camp Amp - ACA
Very nice! Beautiful construction, well done!!

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Old 6th April 2018, 03:03 PM   #4046
Eric is offline Eric  United States
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Amp Camp Amp - ACA
Very neat and tidy execution! Looks like that amp will run fairly cool with oversized sinks!
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Old 6th April 2018, 05:15 PM   #4047
zman01 is online now zman01  Bangladesh
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Well done zikinho, amp looks very nice!
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Old 6th April 2018, 11:42 PM   #4048
Dennis Hui is offline Dennis Hui  Canada
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So pretty...
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Old 7th April 2018, 08:32 PM   #4049
Nelson Pass is offline Nelson Pass  United States
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Amp Camp Amp - ACA
I have been asked by management to comment on a couple of subjects
relating to the updates on the original ACA.

Power supply:

It's not that the original 19V supply had any real problems, but it ran
warmer than I liked, had some RF noise (they all have some), and
being surplus had availability issues.

We have tested several 24V desktop switchers for use in these
amplifiers, and selected one, the Meanwell GST120A24-P1M.

A good price has been negotiated from distribution , it is reliable with
warranty, runs cool, and was quieter than the others tested. It will be
available in the store.

Performance of the newer ACA:

The name has gotten confused, originally being ACA 1.1 on the artwork,
then ACA 1.5. Doesn't matter, it's now the 1.5 for sure.

I have run some distortion and power curves on these various versions
to give some idea of the differences in performance. You will see these
below, and to put it simply, the ACA 1.5 has lower distortion, and with the
24V transformer, more power. Probably the cheapest and most effective
tweak you would ever want.

You can use also this supply on the original ACA, but you will want to
adjust the DC value on the output up to 12V. You can also adjust the
feedback resistor and bias resistors down to the values of the ACA 1.5.

The ACA 1.5 being stereo, there is the possibility of driving it with
balanced lines so as to have more power. You can install the XLR
input on the back, and if you have a balanced source, you're all done,
you just connect your speaker across the black output terminals,
with the left ch being "+" phase, and the right ch being "-" phase
(the channels each being inverting, the red terminals are ground,
and not used).

Any questions, you can post them here.

Attached Images
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File Type: jpg aca 15 dfreq.jpg (64.6 KB, 420 views)
File Type: jpg aca 15 damp BAL 16 24.jpg (64.0 KB, 136 views)
File Type: jpg aca 15 damp BAL 8 24.jpg (64.9 KB, 131 views)
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Old 7th April 2018, 09:35 PM   #4050
Zen Mod is online now Zen Mod  Serbia
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and yes , question regarding 1.1 vs. 1.5 version , is certainly most intriguing and important one in last decade .....

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