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Thanks for confirming, Pete!
Wow, that enclosure is gorgeous!! I'm going to try and do something similar. If it's not too much trouble, what are the dimensions of the enclosure? Thanks.Hello Pete
I recently built this amp and experimented with a couple of single opamps I had in my possession.
I tried OPA2209 ( good details and faster than stock but quite edgy and noisy). AD797 ( very quiet background, good details especially in the lower end however it’s not unity gain stable. It’s most probably oscillating as it heats up quite a bit). I got the Sparkos Ss3601 singles after reading a post on this thread and they are quite good. The extension on either side is very good. The amp sounds faster and there more details and separation.
Last week at a Audio meet up I carried this amp along with my Cayin iHA-6. We connected a Audio Note DAC 0.1x to the Nutube and fed the pre out to the iHA-6. Listening on my LCD-X and the demo Meze Empyrean and HD800 available there at the meet up, the synergy was so beautiful. The sweetness of the DAC was just flowing through to the drivers. Amazing micro details and a lush 3D soundscape. When we took the Nutube out of the chain and fed the DAC directly to the Cayin the whole magic disappeared. There was no 3D enveloping sound stage, the vertical stage and layering between the instruments disappeared. The details were still there but the sweetness disappeared. Maybe there was a impedance mismatch between the DAC and the Cayin.
I am not a electronics guy. Just someone who can solder by numbers. Can any of you more experienced guys tell me what is the input impedance of this amp. The guy who had got the Audio Note DAC to the meet is Aernoud Dekker, the India CEO of Audio Note and he has been asking me about this ever since. Such has been the effect of this little guy.
Thanks in advance
( I am trying to figure out how to post pics of the amp here)
Prabeer
That looks great! I just pulled mine out to use as a Roon endpoint with a Raspberry Pi. I forget how good it sounds for the cost.Well, here is what my project ended up looking like. I installed a dact type 21 clone volume pot from ebay, but it made the sound too "tini" or thin, very V type EQ, going back to stock volume pot, as I like the more midrangy, thicker and smoother sound.
That looks great! I just pulled mine out to use as a Roon endpoint with a Raspberry Pi. I forget how good it sounds for the cost.
I had an old pickle jar lying around and decided to use it as a housing for my Nuhybrid amp. It looks nice and sounds great, and as an unexpected bonus the wires seem to cushion things so there are no microphonics.
More pics over here: https://masto.amosamos.net/notice/Af2Q4VWhW2cjsiOeOG