Any experiences with the hifidiy pcm1794 dac? - diyAudio
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Old 27th January 2011, 06:28 AM   #1
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Default Any experiences with the hifidiy pcm1794 dac?

I have ordered the PCM1794 dac kit (olympic version) from hifidiy. Is it anyone here with experience with this dac and possible upgrades worth looking at?

I ordered it with upgraded chip and clock:

PCM1798/4 olympic version DAC Kit [PCM1798/4 DAC] - $159.00 :


Last edited by Sveinung; 27th January 2011 at 06:32 AM.
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Old 27th January 2011, 10:46 AM   #2
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NE5532? Chunk it... use someting better there.
Also, the tube I think is just a gimmick in their output stage, not a real benefit.
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Old 27th January 2011, 11:06 AM   #3
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Thanks for the tips

What will be a better option than the NE5532? OP275?

I have ordered a amperex 6922 gold pin tube to use instead of the 6n11 tube in this DAC , hope it is worth it If not, I will try to improve the output stage later.

The signal capacitors in the analog stage are maybe a typical component to upgrade?
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Old 31st January 2011, 08:18 AM   #4
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I have now built this dac and listened to it for some hours, and did just put in the amperex 6922 gold pin tube.

Original this dac is good. It was a good upgrade from my sony X7ESD player connected with the coax cable. But after changing the tube to the amperex and changing the ne5532 op-amps to lm4662 it becomes a totaly amazing! This is after no break in, but it is already a totaly new clarity, homogeneity, sound stage, bass drive and naturalness over the sound.

I am also waiting for a couple of ampohm PIO capacitors for the outputstage.
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Old 5th March 2011, 12:58 AM   #5
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Sveinung, did they supply schematics with the kit? I'm thinking of building one to upgrade an old Sony player (308esd) via the toslink optical, but not sure about the tube output stage and i'd like to be able to bypass it if needed...? also any issues with ordering from China? looks like very nice kits on their site.
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Old 10th March 2011, 12:26 PM   #6
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Yes, they supplied schematics. You can chose to to bypass the tube output if you want by switching some pins.

hifidiy is easy to deal with. No problems there! Good quality on the prints and parts
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Old 10th March 2011, 07:50 PM   #7
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Sveinung, many thanks for the tip. The kits do look very nice and of high quality. You are using the tube, what do you think about benefits of this output (instead of direct from op-amps)? Cheers! Tim.
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Old 12th March 2011, 07:18 PM   #8
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To be honest I have not tried it without the tube, so can really not tell you anything clear about that.
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Old 5th May 2011, 09:05 PM   #9
UMarcus is offline UMarcus  Germany
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i'm want to upgrade to a new dac with PCM1794..

This DAC look very nice.

@Sveinung : .. 2 Month later.. any updates about your impression of this dac, any additional improvments ?

Did any body else listen to this dac ? Comapre to other ?

Thanks regards
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Old 7th September 2015, 10:50 AM   #10
Turbon is offline Turbon  Sweden
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Hi Sveinung et al

Yes - sorry to lift a historical thread...

Could some kind soul please share the schematic with me over PM? I got the HIFIDIY olympic version with pcm1794 and 1ppm clock in my knee in a deal I made. I hate stuff that doesn't work ;(... HIFIDIY doesn't answer my emails presumably as I ain't the original buyer

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