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Dx Super A and Dx Regulator Group Buy Interest

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#141
Now my house move is over i will finally have some time to order the components for the psu. Has anyone got a BOM handy? If not I'll just read on the boards 😀

Terry what are you findings on the power supply? Mind sharing your experience?

Best,
Thomas
 
#142
Hi Thomas,

The power supply works just as advertized. Easily adjustable and very stable. I am actually using it to power an SKA GB150 as I needed to be able to dial in +/-52VDC for that amp from a 40-0-40VAC transformer. It works perfectly for that. The heatsinks don't even get warm so I am sure you don't need anywhere near what I put on mine.

I am uploading the BOM I have. You will want to check it against the schematic as there may be some changes (upgrades).

Blessings, Terry
 

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#144
You're welcome and yes, I got a lot of enjoyment out of building them. A few are not quite in cases yet but all play. As a matter of fact I just built another VSSA PMI style. That is quite an nice design. Amazing that you can get such amazing sound out of 6 transistors.

Blessings, Terry
 
#145
Terry..... this kind of amplifier needs a preamplifier

as the gain is one, or less than that...so, you cannot enter with a CD player directly, it is a non complete audio amplifier that ask for a preamplifier in order to produce sound....so, i do think it is not 6 transistors.... if you complete the unit in order to receive standard Line out level, then you gonna have more than 6 transistors.

If you plug a line out from Satelite Receiver, Open Rell tape deck, DVD output, CD output or any line level, then your output power gonna be less than 200 miliwatts at 8 ohms.... that amplifier needs several volts of driving audio to put some power out.... in my personnal point of view, it is not a complete amplifier...it is just a driver and output stage.

I have assembled, just to listen and to test....this style of amplifier.... a couple of years ago.

regards,

Carlos
 
#146
Hi Carlos, we must be talking about two different amplifiers. The one I am talking about is the through hole VSSA. I actually hooked it up on the bench right next to the Super A. I used Y-connectors for the inputs and an A/B speaker switch. I fed them with a Memorex CDR Player that has a headphone jack and volume control. They have almost exactly the same output. Very close in sound signature as well. If you get some extra time, you might want to throw one together. Not many parts and surprisingly good sound.

Blessings, Terry
 
#149
Hello gentlemen 🙂

I just want to say that I still have boards this is not over yet I will committed to continue supporting Carlos no matter what happen with internet or no internet if you can't reach me at my e-mails PM I be there for you guys always.

Best Regards
Juan
 
#153
You are a patient man. Once I have the parts I can't wait to start stuffing them. I will be building the case for my Super A in the next couple of days. I will probably use a Mr Evil capacitor multiplier for the PSU. I am using the DX Supply for an SKA because it will run at 50V. I will be running the Super A at +/-38V.

Blessings, Terry
 
#156
Hi Guys,

Well I finished the Super A. Been playing it most of the morning. Sounds very nice. I have it biased at 200mA per rail and the heatsinks are barely warm. I'm going to leave it there for a while and let everything burn in. I used a Mr Evil/PMI Cap Multiplier for the PSU as I am using the DX power supply for another amp that needs higher voltage. Using a 25-0-25vac Antek transformer and with a one volt drop for the regulator the rails are +/-38.4Vdc.

Here are some pics of the finished amp.

Blessings, Terry
 

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#160
Hi Carlos,

Thanks for taking the time to do this. Yesterday I hooked up my scope and saw the thick trace just as you show in the video. I will remove C38 today and test again. Inthe other thread you suggest installing a resistor in its place. Is that for improved sound or stability?

Thanks, Terry
 
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