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The Alpha Big Boy with Buttah (ABBB) 52w Class A Amp GB
The Alpha Big Boy with Buttah (ABBB) 52w Class A Amp GB
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Old 5th August 2019, 10:44 AM   #191
aive is offline aive  Australia
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Join Date: Sep 2013
Quote:
Originally Posted by Vunce View Post
Thanks X!
I’m running 37vdc after the onboard capMx and .600vdc across the parallel sensor resistors, I believe that’s approximately 2.75A bias current.
All cpu temperatures are very well under control. The Mosfet coolers are running 37°C at the fins and 50°C at the aluminum angle clamp bar.
The amp at idle is silent with my test speaker setup, but I will hold off judgement until I hookup to my main speakers that are very efficient and reveal any noise.
I was listening for about 2hrs tonight using an iPhone—>Bluetooth module with Toslink output into an “old school” R-2R Dac. For only a single channel now, the ABBB sounds wonderful !!
What’s the secondary rating of your transformer out of interest?
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Old 5th August 2019, 10:56 AM   #192
Vunce is online now Vunce  United States
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Join Date: Jan 2014
Location: LI, NY
The Alpha Big Boy with Buttah (ABBB) 52w Class A Amp GB
I’m using a 600va, 32v Antek transformer for each channel. You could use a 500va as well.
The 12v tap can be used for a small linear psu to power the fan controller.

AN-6432 - 600VA 32V Transformer - AnTek Products Corp

Last edited by Vunce; 5th August 2019 at 11:04 AM.
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Old 5th August 2019, 11:10 PM   #193
aive is offline aive  Australia
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Quote:
Originally Posted by Vunce View Post
I’m using a 600va, 32v Antek transformer for each channel. You could use a 500va as well.
The 12v tap can be used for a small linear psu to power the fan controller.

AN-6432 - 600VA 32V Transformer - AnTek Products Corp
Cool - I got 500 VA 32v trannies so should get similar results hopefully
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Old 5th August 2019, 11:28 PM   #194
Vunce is online now Vunce  United States
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The Alpha Big Boy with Buttah (ABBB) 52w Class A Amp GB
Should be no problem Aive,
I probably went a bit overkill with my transformers
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Old 17th August 2019, 10:42 PM   #195
wmchugh is offline wmchugh  United States
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Join Date: Mar 2019
Hi I realized I had forgotten to post on this thread out of my eager to place the order on Etsy. I placed my order on July 4 at 6:41pm. It was Order #1481075195 just to clarify. PM me if you need.
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Old Yesterday, 12:00 AM   #196
xrk971 is online now xrk971  United States
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The Alpha Big Boy with Buttah (ABBB) 52w Class A Amp GB
Good news folks. I just got word that the ABBB boards just completed manufacturing and are being packed for delivery to USA. Probably another 5 days before I receive the boards and will send out by next weekend. You will receive at no extra charge, a set of 4 mini boards per amp channel that will let you solder the BJT and MOSFETs to and then the flying leads can be either soldered from there or you can choose to use Molex connectors (premade PC power cables). The mini boards permit installation of a snubber right at the MOSFET pins - Something we found critical to prevent oscillations.
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Last edited by xrk971; Yesterday at 12:06 AM.
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Old Yesterday, 02:03 AM   #197
Vunce is online now Vunce  United States
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The Alpha Big Boy with Buttah (ABBB) 52w Class A Amp GB
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Originally Posted by xrk971 View Post
Good news folks. I just got word that the ABBB boards just completed manufacturing and are being packed for delivery to USA. Probably another 5 days before I receive the boards and will send out by next weekend....
Excellent news X!
Soon to be newborn ABBB’s out in the wild
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