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Apex A40 Amplifier Build Thread
Apex A40 Amplifier Build Thread
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Old 10th June 2019, 09:10 AM   #11
shahzad831 is offline shahzad831
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Operating voltages??
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Old 10th June 2019, 12:04 PM   #12
apexaudio is offline apexaudio  Serbia
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Quote:
Originally Posted by shahzad831 View Post
Hello every one
Is it possible to feed A40 with +/-75vdc? Output devices are sanken's a1216 c2922.
Yes you can feed A40 with +/-75vdc.
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Old 10th June 2019, 12:10 PM   #13
shahzad831 is offline shahzad831
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Any modification?? Change in resistence values and bias
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Old 10th June 2019, 02:01 PM   #14
apexaudio is offline apexaudio  Serbia
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Originally Posted by shahzad831 View Post
Any modification?? Change in resistence values and bias
No changes
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Old 10th June 2019, 02:03 PM   #15
burnmaster is offline burnmaster  Bulgaria
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Hi shahzad831. Hope you know what I'm saying because I'm using an online translator. Which I changed into my future A40 and I hope it is good. To double the power I build 2 monoblocks, each block having 2 bridge boards. I use on powerful transistor terminals. I raised the current in the 800mA final resistors ... you probably call it a bias. The end transistors are very expensive, so I use big radiators. Extremely strong I have emphasized on the capacities, as I am convinced that they bring the good sound.)) For each monoblock are provided 250,000mF. For the whole amplifier 500,000mF .... or in short, half Farad.) Previous tests passed successfully. The good thing in this case is that every monoblock due to the bridging connection will use XLR connectivity, and also my oppo sonica dac has a fully balanced XLR output.

I hope I've been helpful. Greetings.
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Old 10th June 2019, 02:16 PM   #16
shahzad831 is offline shahzad831
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Thanks for feedback guys. Actually i have some numbers of orignal sankens in stock ao i want to utilize them in a40 or sr200 . Issue is this, that i have an SMPS (based on 2110 3525 ETD 59 DIY) whos output is +/-75vdc 10 amps . And i want to put that smps on job. What will be the best option SR200 or A40? Which amp have low THD and good temprature average. My speakers are peavey SP2. Thanks for your precious feedback.
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Old 10th June 2019, 03:54 PM   #17
apexaudio is offline apexaudio  Serbia
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Quote:
Originally Posted by shahzad831 View Post
Thanks for feedback guys. Actually i have some numbers of orignal sankens in stock ao i want to utilize them in a40 or sr200 . Issue is this, that i have an SMPS (based on 2110 3525 ETD 59 DIY) whos output is +/-75vdc 10 amps . And i want to put that smps on job. What will be the best option SR200 or A40? Which amp have low THD and good temprature average. My speakers are peavey SP2. Thanks for your precious feedback.
Your option is A40, SR300, B500, HV23...
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Old 10th June 2019, 04:26 PM   #18
shahzad831 is offline shahzad831
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Then i will go for A40 nice symetrical design. I didnt saw Hv23 schematic yet i will try to search it
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Old 10th June 2019, 05:19 PM   #19
AdeS is offline AdeS  Brazil
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Take a look here, shahzad831!
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Old 10th June 2019, 05:42 PM   #20
shabusf is offline shabusf  India
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Hello Friends, Below are my build details. Trafo: 39-0-39, 5A per channel. Dual Mono. Drivers: MJE15028/29 (rated @120v, but i hope it is okay for +-54v dc ) sourced from RS components. Outputs: Toshiba 5200/1943, sourced from taydaelectronics. BC550/BC560/BD139/MJE340/50 - Sourced from RS Components.

I used Alex MM's 1.4v PCB (the offset series resistor should be 470k, that is the only change from the silk, otherwise populated components as per the silk). If you use 1.5v PCB, silk is having the correct value 470k it seems.

Bias: ~45mA, Offset +-5mV

Use genuine components, your amp will be up without any issues. And of course you will never get disappointed with the sonic, a great sounding amp

As of now I have only two pairs at the output, adding the other one soon.

Happy time for the Apex A40 fans

YouTube

Regards, Sha
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