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Jeff Rowland 501s burn in ... a strange experience

I have received today my monoblocs 501 and borowed a ML 39:
ML 39
NBS monitor III
Capri
NBS Monitor III
monoblocs 501
NBS Monitor IV
Infinity Renaissance 90

around 2:p.m (Europe) I have installed the system:
sound very detailed, beautifull soundstage imaging & focus, great energy,
on the negative side, some high frequencies too harsch a little bit venomous

6 hours later (system working all the time) complete change ... do the monoblocs suffer jet lag? ... ;-)

the sound has become very fat and heavy, has the energy of a sleepy hypopotamus, everything is slow, too warm, without focus, like coming from bad tube components ...

from one extreme to another... how is that possible, so extreme, I am ???

any suggestions?

thanks
clavil

Showing 2 responses by macrojack

macrojack
1,303 posts
 
Aren't power cords all about eliminating AC line noise? Doesn't it make sense that the DC signal proceeding from the PC-1 to the Rowland amps would have no need for and could not benefit from a power cord upgrade?
I thought the primary purpose of the PC-1 was to provide a cleaner, quieter, stiffer current to the downstream appliances.
And wouldn't it be advisable to break in the 501s and the PC-1
concurrently, rather than sequentially? The latter just adds to the already cumbersome break-in period.
macrojack
1,303 posts
 
Guido - You should get in touch with Jeff and let him know about your "findings". He thinks the Capri benefits from the PC-1.
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