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Universal Buffer achieving -140 dBc (0.00001 %) THD

Hi Tom, as Kevin said, just ignore the guy who obviously has his own agenda and no manners at all.

Excellent design/project and beautifully prepared and I especially love the photo description on post #97 - that's a classic explanation.



and you can add whatever 'colour' to the sound that you want somewhere else in the system like I do with Uriah's CloneNote volume control (yeah, sorry about that) and the Betsy OB speakers
 
Neurochrome.com
Joined 2009
Paid Member
Excellent design/project and beautifully prepared and I especially love the photo description on post #97 - that's a classic explanation.

Thank you. I appreciate your feedback.

and you can add whatever 'colour' to the sound that you want somewhere else in the system like I do with Uriah's CloneNote volume control (yeah, sorry about that) and the Betsy OB speakers

Or as a plugin in whatever media player you use. That way you can turn it off and/or try something else should you feel like it.

Tom
 
Just inquiring on why those test conditions where chosen to showoff what this board can do. That's all.

If you could provide an example of a typical use cause where this board would be used under those conditions, and why this buffer would be beneficial in this particular application, it would clarify things a bit more for me.

Um, into one of Tom's power amp designs?
 
Ok so this means you have measured his boards and have even more comprehensive data for us? Or is this based on A/B/X test results?

Three of us in the UK use Tom's amps and we have a combined listening experience of over 120 years. Including Munich, and every show and bake off in the UK.

So if you think that one specific measurement is somehow going to prove your own particular agenda correct, and our collective experience wrong, feel free to continue with your crusade.

Your audience has reduced though as you are the first member of DIY Audio to go on my ignore list.

Congratulations.
 
Three of us in the UK use Tom's amps and we have a combined listening experience of over 120 years. Including Munich, and every show and bake off in the UK.

So if you think that one specific measurement is somehow going to prove your own particular agenda correct, and our collective experience wrong, feel free to continue with your crusade.

Your audience has reduced though as you are the first member of DIY Audio to go on my ignore list.

Congratulations.

Unsighted ABX testing? Tom as a man of science will be the first to tell you that the human ears can not be trusted under sighted listening conditions. Measured data is all that matters, and it's all I have requested. Measured data will tell us all we need to know. There's nothing negative about requesting measured data. Tom's entire marketing approach is centred around measured data. So it really baffles me how requesting additional data should be perceived as negative. When Tom proves that the Multitone IMD results @ 10v and 600R are just as good as the results Anand said early in the thread "Wow! The Multitone IMD says it all....Bravo!: all of the clients of this board, for all use cases will be able to sleep at night. And it will only trigger additional sales. A win for Tom, and a win for all of Tom's clients.
 
I have bought the HPA 2 kit on the strength of Tom's reputation from the users of his other products in other forums I belong to in the UK. I haven't built it yet but it looks very well thought out with quality parts and the kit comes with a great guide that a diy novice like me can understand and use.

All in all so far a good customer experiance, and I am considering a buffer in the future for a pre amp partly on the basis of this. I don't understand the technical measurement terms particularly but I don't care as long as the product sounds good and is well thought out.

What I do object to is the apparent aggressive rubbishing and destructive "criticism" of a product on it's for sale thread. Especially as the manufacturer has demonstrated time and time again that he is willing to constructively engage with posters and answer questions about his products in an open and honest way.

Class D maybe you should think about how you are coming across here.
 
I have bought the HPA 2 kit on the strength of Tom's reputation from the users of his other products in other forums I belong to in the UK. I haven't built it yet but it looks very well thought out with quality parts and the kit comes with a great guide that a diy novice like me can understand and use.

All in all so far a good customer experiance, and I am considering a buffer in the future for a pre amp partly on the basis of this. I don't understand the technical measurement terms particularly but I don't care as long as the product sounds good and is well thought out.

What I do object to is the apparent aggressive rubbishing and destructive "criticism" of a product on it's for sale thread. Especially as the manufacturer has demonstrated time and time again that he is willing to constructively engage with posters and answer questions about his products in an open and honest way.

Class D maybe you should think about how you are coming across here.

Not once have I criticized the design of this board, or the measured results. I have only requested industry standard data to back up its performance under real world use cases. Tom's response to this request was rather defensive, accusing me of being a troll and competitor. But how can proving his board's performance possibly be bad for business?

Tom has trashed pretty much every designer in the industry who uses discrete opamps, and manufacturers discrete opamps for years. By saying what he has said about discrete opamps, it would mean all manufacturers of discrete opamps are snake oil salesmen, and all designers that use them are fools. because IC opamps are superior and cheaper under all conditions. Backing up this data should in no way harm Tom's stellar reputation. It will only serve to bolster it.
 
Not once have I criticized the design of this board, or the measured results. I have only requested industry standard data to back up its performance under real world use cases. Tom's response to this request was rather defensive, accusing me of being a troll and competitor. But how can proving his board's performance possibly be bad for business?

Tom has trashed pretty much every designer in the industry who uses discrete opamps, and manufacturers discrete opamps for years. By saying what he has said about discrete opamps, it would mean all manufacturers of discrete opamps are snake oil salesmen, and all designers that use them are fools. because IC opamps are superior and cheaper under all conditions. Backing up this data should in no way harm Tom's stellar reputation. It will only serve to bolster it.


He's said he'll provide it, apparently that's not good enough for you.
 
Once, and if requested politely. Six times is plain rude. Specially because Tom already said after the 1st request that he would provide those measurements.

If I wasn't accused of "throwing his board under the bus" trolling, or being a competitor, especially with references to a particular manufacturers work, my next comment would have been thanks! And that would have been it.
 
Asking basically the same question 6 times with a descending amount of respect and diplomacy = 6 times the amount of thankfulness by anonymous users who can't voice their concerns themselves on a public online forum.

It's simple internet logic guys!


On Topic:

Tom, you said it complies with RoHS, I think you should also mention it on the website or even a possible next PCB revision at some point in the future. Maybe you already did and I didn't notice. If so, please disregard everything I just said! (And this is not criticism, more of a friendly suggestion, obviously...)

(I say this not only with regards to the marketing aspect, but maybe also if customs anywhere ever question this. I don't know how the laws are developing globally and I don't know what legislation will bring in the near future, but I could see this being an issue going forward, even for private consumers trying to import.)
 
Last edited:
Neurochrome.com
Joined 2009
Paid Member
Tom, you said it complies with RoHS, I think you should also mention it on the website or even a possible next PCB revision at some point in the future.

That's a good point, actually. Thank you. I may be able to claim CE compliance as well. I'm sure the circuit is CE compliant, but I need to look into how those types of regulatory compliance work with assemblies and subassemblies.

Tom