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Old 14th July 2013, 11:14 PM   #1121
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Quote:
Originally Posted by Variac View Post
I often go to RMAF too..
Would enjoy getting together. Would like to build a good fast bass amp as well. So far, the Crown K2 series is my favorite bass amplifier. Very fast and punchy.
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Old 14th July 2013, 11:38 PM   #1122
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Default DiY Noob questions

Hey All,

I apologize if I am asking these questions in the wrong thread.

I am intrigued about the new ACA and have mustered the courage to try building my first amp (actual my first anything!). I was planning on using a pair of Vandersteen 2CE's and just wanted to confirm that the ACA can power the Vandy's. If I am barking up the wrong tree can someone suggest an alternate 1st time diy project that would work with the Vandersteens?

Much appreciated!
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Old 15th July 2013, 12:11 AM   #1123
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The current draw by the ACA starts slow so the thump is slow. At turnoff, there is a big thump because to power supply can't hold the voltage up very long with 1 amp flowing. It would take about 200,000uF across the supply rail to slow down the turnoff thump. An alternative to the big cap is a disconnect relay or an extra switch contact to disconnect or short the speaker.
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Old 15th July 2013, 01:15 AM   #1124
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That's not good news
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Old 15th July 2013, 01:41 AM   #1125
Eric is offline Eric  United States
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If you build a stock ACA - there is no turn on thump at all. There is a VERY slight turn off thump. In addition, the amp is VERY quiet when used with a computer power supply - no hum or hiss that I have heard. This seems like an ideal amp for a high efficiency speaker!
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Old 15th July 2013, 02:40 AM   #1126
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That's great
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Old 15th July 2013, 04:01 AM   #1127
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Hi
I'm interested in the Amp camp amp – Chassis only– to use for a different compact amp
Before I order:

What is its size internally?
So there's a (16 mm) hole for a power switch, but no hole for an IEC power inlet? (Is it designed to use another case for the PSU?)
Packed, what does it weigh?
I didnt see a store FAQ - does the store ship to Australia?

Thanks
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Old 15th July 2013, 02:55 PM   #1128
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It's designed to use an external laptop style power supply, so there is a small hole for a DC jack. You could probably cut out an IEC hole, there seems to be more than enough space.
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Old 15th July 2013, 03:13 PM   #1129
Bones13 is offline Bones13  United States
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Just pre-ordered the complete kit. My previous projects have been tubed, or at least hybrid. I have always wanted to try a Pass class A SS amp with my Zu Audio Essence speakers. Just is just the ticket price-wise (and fun-wise) for me to get a sample.

The ACA will be compared to my current class AB1 EL34 PP 35watt amp.

From the reading above, there might be a slight improvement with a dedicated linear PSU, which could be yet another product.

DIY so far for me (well from kits, I am not an EE, or even an enthusiast willing to put in the time for trying to design my own. At least not yet) amp, tubed DAC, and most recently a Maxxed Phono Stage from K&K audio (lundahl transformers)
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Old 15th July 2013, 03:24 PM   #1130
Variac is offline Variac  United States
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And the size in mm is about ( internally )
78t x 73w x 198d
Our understanding is that the writing on the front panel will come off with acetone.
there are now various other chassis' available:
http://www.diyaudio.com/store/amplifier-chassis.html
The store will ship most places, certainly Australia, but shipping cost may be prohibitive.


Quote:
Originally Posted by otto88 View Post
Hi
I'm interested in the Amp camp amp – Chassis only– to use for a different compact amp
Before I order:

What is its size internally?
So there's a (16 mm) hole for a power switch, but no hole for an IEC power inlet? (Is it designed to use another case for the PSU?)


Thanks

Last edited by Variac; 15th July 2013 at 03:27 PM.
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