Audiophool is trying to figure out why V-bro seems

[V-bro]

There has been a discussion going on in another thread about the pros and cons of either of the above named amps in terms of design aspects, ease of building etc.

I'm not a moderator, so I can't move all the postings. The only thing I can do is link to the other thread and politely ask to continue this discussion over here...

The other thread:
http://41hz.com/forums/topic.asp?TOPIC_ID=2597

Last postings before we continue here:
http://41hz.com/forums/topic.asp?TOP...97&whichpage=2


------X-max. can be several meters on any driver, too bad it can be done only once...------

[audiophool]

quote:As with any subjective matter like preference there's not much use discussing about it as we are both wrong and right. I have stressed the inefficient method of deriving 5V from VPP in AMP15 in other threads, but it comes with the ease of using just one transformer. An efficient method would be a switch mode solution, but that would most likely be noisier. It's always a compromise unless you can tell me a better method than a complicated separate supply. This "inefficient" solution wasn't introduced by me by the way, so I'm not in any need to defend it at all...

AMP7 doesn't use this method by the way, it has the same solution as Truepath with PSU1-VR boards. Only with the difference (and many users have endorsed this as a good mod for a Truepath) is that the 5V final regulation takes place ON the mainboard instead of externally. But neither of the aux. voltages are derived from VNN or VPP.

Have you built the AMP7, had a real close look at the design? Or the AMP15?

What use is it to discuss about the efficiency of 50mA supplies on such a powerful amp anyway? The aux supplies use up so little power anyway that the lack of efficiency is still a small percentage of a small percentage of the total power. It's no big deal, so I agree with Jan's solution on the AMP15.

Krilli is right, this discussion does belong somewhere else...

------X-max. can be several meters on any driver, too bad it can be done only once...------
Edited by - V-bro on 27 Apr 2009 15:14:52

I think you have misrepresented the gist of this discussion in your topic of this thread. It should be "Audiophool is trying to figure out why V-bro seems to be so keen to irrationally discredit Truepath." I have not discussed nor am particularly interested in discussing "Why choose either Truepath, AMP7 or AMP15".

quote:As with any subjective matter like preference there's not much use discussing about it as we are both wrong and right.

If I have been subjective in this discussion, then I stand corrected. Where have I said something subjective?

quote:I have stressed the inefficient method of deriving 5V from VPP in AMP15 in other threads, but it comes with the ease of using just one transformer.

But I already use Truepath without deriving 5V from VPP with just one transformer and without fancy switching supplies, and so do many members...

quote:Have you built the AMP7, had a real close look at the design? Or the AMP15?

When the schematics were released, I studied them both in detail. I also have an AMP15 prototype which Jan sent to me which I have not built and don't intend to (I'm not quite sure what to do with it - I don't want it but feel that it would be unethical to give it away since Jan gave it to me).



Rgds.

[V-bro]

It's your subjective interpretation of my postings to say I irrationally discredit Truepath.

My opinion on the ease of building Truepath is subjective and I'm not ashamed to admit that.

The idea of winding extra windings I used in my very first Truepath build, the only reason why I didn't really like it back then is because I had to design a whole new PCB to control the on/off sequence as with the standard supplied 41hz PSU1 boards this method is not incorporated. I did heck the softstart module once to let one relay switch 5V. This worked, but was not very elegant. I did test what happened when I just switched all voltages on/off, but I often got a funny "squeel" when I powered it off.

Your T-brick solution does incorporate both the option of winding extra transformer windings or use an aux. transformer. Nice solution indeed, but to tell your customers to go add windings to a mains transformer is not always welcomed. Customers might want to use other type of transformers.

Why do you not intend to build the AMP15? It's a fine amp....

Truepath is great, but it's not the only great T-amp around. That's all I'm saying, not to discredit Truepath. I don't find the down sides you mentioned about the other designs such great down sides. Like I said, most people just want a working amp and admit it or not, AMP7 is MUCH easier to build than Truepath for most people.

------X-max. can be several meters on any driver, too bad it can be done only once...------

[V-bro]

Sorry, your thread title didn't fit there...[)]

------X-max. can be several meters on any driver, too bad it can be done only once...------

[audiophool]

V-bro,

This discussion seems to be going nowhere so unless you want to be more specific in your claim regarding my subjectivity , I have nothing further to say.

Rgds.

[wadoka]

V-bro (Vincent), audiophool (Tim).

As an impartial bystander, may I offer my thoughts?

[V-bro]

Please do...

May I guess?

"Delete this thread and forget all about it?"

I don't want to become impolite to Tim, especially not here in public.

I think he's just being unfair and is being the pot calling the kettle black...

But I know he's not all like that at all, he's been helpful many times and is always being very nice.... and puts lots of effort in helping out....

I just don't understand what's troubling him so much. Reading back the discussion I can only say that I may have ventilated my opinion on the ease of building Truepath, but I don't find I have discredited the amp that badly. On the other hand he's been discrediting AMP15 and AMP7 just the same. With just as petty reasons that only have relation to AMP15, but not AMP7.

I can only ask him once again what he doesn't like so much about the AMP7, because if it is only the fact that it isn't a four layer board I find it rather unfounded. Of course it is a nice feature, but there are lots of excellent designs made on two layer boards.

And again I'm pretty certain I have praised the Truepath design more often than having ventilated down sides about it.

So again I say it is a great amp.[^]

And many members here will know that I have posted about the AMP3 and AMP11 chips being hard to solder much more often...

------X-max. can be several meters on any driver, too bad it can be done only once...------

[wadoka]

Delete the thread? Not a bad idea but not what I was going to say

Although this is an open forum, I dont want to intrude without permission, so I'll see if Tim minds before contributing.

[audiophool]

V-bro,

My issue in this discussion is not with AMP15 nor AMP7 nor Truepath. Neither is it about whether or not you care to praise the Truepath. I have specifically challenged you with respect to Truepath simply because that is an area that I know a lot about.

My issue is your presenting something that is subjective as if it were a fact, especially since as an "Advanced" member of this forum, your comments could tend to carry more weight than they would otherwise. This issue is of particular concern in a case where it is in response to a question from a "Starting" member.

I am still trying to figure out why you would do this and here's a couple of things I have considered and ruled out so far:

- There is something wrong with your soldering iron(s)
- You really do believe that there is something significantly difficult about building a Truepath to the point where you feel that you should warn people against it at the first possible instance.
- You have some affiliation with someone/something that causes bias.

Here's the only possiblility that I can think of that hasn't been ruled out.

- You just made a flippant remark without much thought.

You are most welcome to criticize me in an impolite manner or otherwise right here in public or anywhere else as you see fit. As an "Advanced" member, I welcome this. I only ask that you keep it rational and logical because I don't have the time or energy to go in circles. I try really hard to remain objective in my posts.

Rgds.

[audiophool]

quote:Originally posted by wadoka

Delete the thread? Not a bad idea but not what I was going to say

Although this is an open forum, I dont want to intrude without permission, so I'll see if Tim minds before contributing.

Wadoka,

Will you please stop being so damned polite?

Rgds.