John Curl's Blowtorch preamplifier part II

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More wasted time... 6moons audio reviews: APL HiFi NWO 3.0-GO



But do read the postscript.





My Bybee has been shipped, I can't wait. ;)



Scott I'll send you a Bybee. I am repairing a preamp that someone modified. They decide they needed a little black magic and installed ByBees on the balanced inputs in series with pin 1. They also installed them on the balanced output but put them in series with pin 2. I think they meant to put them on pin 1 again but struggled to figure out which was the correct pin.

Anyway out they came. Can't have black magic in my electronics.
 
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Hi John,
Pretty much every time I test an expensive audiophile approved part, I can find the same or better in normal industrial parts. That is both measuring different parameters and listening to the darned things.

It should be noted that the normal parts are considerably smaller than the special parts are. When I strip the silly parts out and install the (usually) better parts, a couple things tend to happen. Firstly the chassis looks neater as these parts actually fit. This may be more important than you think! Secondly, the customer tends to fall in love with their "de-audiophilized" device.

Cleaning up after someone who installs these large parts is frustrating. They often destroy plated through holes - and that leads to either a fault or intermittent operation. The other issue is getting rid of literal gobs of silicone or hot glue so you can work on the PCB. I like the special neat guys who thoughtfully drill out the plated through holes. This is especially nice when a trace has a hole in it as it travels by. The hole typically interrupts these traces completely. Lots of repair work. Occasionally I get a unit that is too damaged to be made reliable again at sane money. Those I have to write-off.

Internet modders cause a ton of damage without knowing it. I wish these folks would stick to something they have a good understanding of (really know, not think they know).

-Chris
 
Hey Chris, i get just about the same experience...
many times a gear is brought to me that after putting in botique parts are really screwed up in terms of looks and sound...
most of the time i politely turn it down as i would not want to have anything to do with it after another has screwed it up...to me it is not about the money....
i usually tell them, if they wanted botique parts, do it right the first time by incorporating the parts of their choice at the start....the one thing i hate is tamper with a good working unit....
 
This Reference Components guy is helpful.

I like that he spars with both sides, Charles Hansen as well as several reviewers. I also notice none of your stuff gets much (any?) mention. He makes very clear that audio is science but does not seem to have much interest in the scientific method. He also espouses the idea that maximum power efficiency is obviously the ideal situation (intuitively) even though there is no scientific basis for this.
 
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Hi Scott,
You could throw a bunch in the bottom of the chassis to make it heavier.

I wouldn't mind sticking one on the HP 4195A that I have to see what it says about it. I have a 500 MHz playground to study it in. Surely that is enough range to see if there are any effects that could possibly affect an audio component. Of course, to be honest, a 100KHz bandwidth would be more than enough to study one in.

-Chris
 
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