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aceofdaves

CLOSED: JAS-Audio Gp-502 Power Amplifier/DAC

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Posted (edited)
Item Condition: Good with the exception of 1 intermittent analogue input
Shipping Options: Pickup available but audition is not available.,Pickup available and you can audition.
Suburb or Town: Brunswick
State: Victoria
Payment Method: PayID, EFT
Reason for selling: Upgrade

**EDIT. Donated to a friend due to lack of interest.

 

 

Further information:

 

Power: 70 W + 70 W

THD: 0.01%

Inputs: 1x USB (inbuilt DAC), 2x analogue (one is intermittent: suspect loose connection)

Outputs: Stereo speaker, Headphone

DAC: This is not specified in the manual but, from the hardware ID, it seems to be a CM108 USB controller/dual DAC (44.1/48 kHz, 16 bit). Data sheets and drivers here.

 

Included Power Cable and QED USB cable (if you'd like it)

 

I purchased this solid state power amp from Sound Reference, Fitzroy for approximately $350-400 as part of my first system in 2015. It is a bit of a curiosity as JAS-Audio seem to be better known for tube amps that are rather expensive new. When I purchased this amp, I was brought to understand that JAS made these SS amps specifically for Sound Reference. At the time, I A/Bed it with a couple of NAD amps and thought that this was the nicest sounding.

 

Once home, my inputs were a Raspberry Pi (Volumio/FLAC) via USB (this worked without any driver installation) and a Rotel 965 CD player via the analogue input as sources. The amp was used to drive a pair of Wharedale 80th Anniversary Dentons, which it did very well. I did once do some direct A/B comparisons between the Rotel (analogue input) and the Pi (USB) using The Mars Volta's 'Octahedron Album'. Once they were volume matched, I could no longer tell the difference between them. I did eventually stop using the USB DAC when I got myself an ODAC. Though I never did a straight A/B comparison, there can't have been a whole lot in it.

 

I used this as my primary amp for 5 years. Over that time, one of the inputs (the one labelled DVD as I recall) has developed mild fault: it is intermittent when you move it. As a result, I strongly suspect that it's just a loose connection. I have an ugly but very functional remote controlled audio routing switch which someone can have if they want the amp and are interested. Under normal circumstances, I would open it up and resolder or replace the connection but my current inability to access my workplace (and so all the lovely equipment it contains) means that I would have to spend rather more money on the fix than usual. If it doesn't sell for any reason then I probably will fix it eventually.

 

It does also have a headphone output if anyone wanted to solve their desktop audio needs with absolute overkill.

 

Pickup preferred due to the weight of the thing. It's solid.

 

Thanks for looking.
 
Photos:

IMG_20200502_180351.jpg

IMG_20200502_180355.jpg

IMG_20200502_180403.jpg

IMG_20200518_190119.jpg

Edited by aceofdaves

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Hey there, sorry I am a bit thick: do you need a pre-amp with this little thing, or can you just plug in a source like a CD?  Thanks,

guillaume

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Not a think question at all, but unfortunately I've donated the amp to a mate due to lack of interest here.

 

For interest, I didn't use a external preamp. Everything was plugged directly into the inputs. I never had the volume knob beyond 3 o' clock. Any further was very loud indeed with no discernible noise or distortion. I occasionally looked at external preamps just so that I could incorporate remote switching or volume control into the setup. In the end, it was simpler to go with an integrated solution.

 

In short, this was a very simple but very nice setup while it was in use.

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