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In Reply to: RE: That is why good trials must be double-blinded,... posted by Lew on September 14, 2016 at 08:02:27
LOL...while it would be useful, to go and get two sets of output Iron, and power/filter iron just so I can build two identical amps and double blind test some resistor/capacitor/grid choke... It is rather impractical.
This impracticality gives rise to placebo-ists who claim one must use 4.3 runs of some specific colour and manufacturer wire between the 100kOhm plate load and the 12AX7's plate in order to get a properly 'efficient transfer' of musical energy so a 2A3 can put out power that sounds like it is coming from an amp with two orders of magnitude more power.
One test I like involves leaving the system alone for a bit, and then come back and listen. And have other folks drop in for a listen. Dropping in on a system 'cold' will give you the, 'it needs work', or, 'I like it much' response...:)
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
Follow Ups:
What I do is to listen to the system with the new device for at least several weeks and then go back to the "before" condition for several more weeks. And ideally, you (or I) should go back to the new device, to see if you (or I) still love it so much or so little. But in practice, I am lazy. Seat of the pants rules. Which is why I am loathe to trumpet my conclusions. My data are usually bad. Thus I sometimes marvel at the degree of certainty about anything, often seen here.
Edits: 09/26/16
I have observed a lot of 'bad' data myself. I have seen a few good results, and my most certain confirmation comes from other sets of ears, preferably on an absolutely 'cold' basis...either they like it or not.
I'll try and stick to building what I like to listen to...:) The basis of a good amp has always started with good engineering.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
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