FWIW: I've never been able to measure any difference in the output of the Hypex/Purifi amps with/without the fancy regulators or fancy opamps. I wouldn't change anything.
https://www.apollonaudio.com/apollon-1et400a-mini-stereo-amplifier/Are the "Basic" Nord and the VTV "based on EVAL-1" the only choice if I want to buy a 1ET400A amp that uses an OPA1612 buffer? Is there any other on the market?
Wow thanks. They are nice.
I see. I am in Japan. I imagine the shipping cost would not be much different from either the US or Europe.As far as I know, only Nord with discrete op amps was reviewed here, not the base model.
I am from Siberia (Russia), but in general, yes, Europe is closer than the United States.
In addition, I do not like VTV externally and internally (some kind of sloppy). But this is of course a subjective opinion.
No doubt that you are an EE TomIt's important to get the correct length or the connectors won't line up. I just plugged one of the Purifi/Hypex Buffers into the Purifi 1ET400A and measured with a slide caliper. I measure 7.8 mm on one side and 8.2 mm on the other. I'd go with 8 mm standoffs. You can always file them down a bit if they're a touch too long.
I see. I am in Japan. I imagine the shipping cost would not be much different from either the US or Europe.
I like the rounded corner design of March, I only wish it had a silver-colored version.
In that respect I think I like the Nord, too. Apollon case seems nice, too but it's the most expensive one.
Speaking of the price, VTV is the cheapest and then Nord and March are about the same.
Without any measurement, it's hard to decide....
I suppose only VTV has been measured (as Purify evaluation version).
Thanks for the suggestion.You are likely get the best performing amp from March Audio. His attention to detail is higher than most and his ability to service you should be better due to regional proximity. You can get more opinions if you like from others on ASR. As this is a DIY thread, you are off topic and so your query is getting less exposure.
As the (very knowledgeable) @tomchr mentioned, there is no measurable difference in the buffers. But if you are an audiophile who needs to try them for yourself, you are better off with a Hypex NC500-based amp and then will have some spare cash to spend trying different buffers. In that case, would look towards the Euro suppliers. They generally have better quality than VTV. Hope this helps!
I did read the data sheet. Thank you.
Did you consider that the data sheet may not match reality? The distance from the bottom of the module to the bottom of the board measures 7.8 mm on the 1ET400A I have on my desk. There's also an important dimension missing in the Purifi data sheet: The distance from the top of the PCB to the centre of the connector pins.
You're absolutely right that I'm an EE. And as such I've learned to always check the mechanical dimensions of components in reality as reality often differs from the information given in the data sheet.