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Problem with Cain and Cain Abbys

I have been using a Dared MP-7 SE amp with 7 watts in a small system with 88db efficiency speakers. They sound very good just not quite loud enough to fill the room. I just purchased a pair of Cain and Cain Abbys with a 95db efficiency rating. The problem is when I connect the Abbys to this amp the Cats Eye Tube tells me I am overdriving my amp the minute I hook them up, NO VOLUME, no input. I can also hear a high-pitched oscillation. I can turn the volume up include a input, but it sounds like I am over driving them, as the sound seems soft. The abbys seem to work well with my SS equipment. Whats the Problem?
dlstephenson
6 responses Add your response
gregm
3,405 posts
 
Strange, sounds like a short-circuit s-where (God forbid)...
Can you measure the spkrs dc resistance and get back?
Does the amp still operate fine w/ yr other spkrs?
dlstephenson OP
121 posts
 
Have measured the standing OHMs of the Abbys and they are good at 7ohms. NO shorts. These speakers do work on my Solid State Equipment with no problems.
gregm
3,405 posts
 
Something is definitely wrong, either with the wire (improbable) or the amp (more probable, but amazing nonetheless). Can you contact the Dared people?
BTW, are you using a non shielded or non-standard spkr cable? If so change it for any bog-standard $1/yard shielded wire & try the combo out. You may be sending the amp into oscillation via higher than normal capacitance (or picking up noise maybe??)
Good luck!
dlstephenson OP
121 posts
 
Ok solved the problem. I replaced the Chinese 12AU7s with EI tubes and that was it. WEW Seems that the 12ax7s and the 12Au7s didnt like each other with the Q of the drivers. This change was suggested by the rep that sold me the equipment.
gregm
3,405 posts
 
Now that's what I call thinking out of the box! Good for you, Dl!
arkprof
182 posts
 
Those Cains tied to tubes will make you really happy! Guaranteed!
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