2. amps-preamps
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Rogue 88 problems

I bought an used Rogue 88(not magnum). I met couple of problems, hope somebody could help me out.
1. The fan gives rather big noise. My listening room is small (13X12), and it's really annoying. The seller told me the amp is about a year old. Is it about time to change the fan?
2. I hear sparks from the speaker in the first 20 mins when I turn 88 on. What could be the cause of this?
3. This one is not really a problem. When I switch from UL to triode, the volume of sound dosen't change. I am expecting the sound to go down, because the output is half of UL.

Thanks in advance.
pren

Showing 3 responses by precbsed

precbsed
49 posts
 
I had what sounded like arcing on start up as well with my 88 Magnum. I cleaned all the tube sockets and it eventually stopped happening. To quiet the noisy fan I simply removed the cover and thoroughly dusted the fan and its housing with a soft make-up brush. It worked. I have only used the ultralinear mode so I can't help with your last question.
precbsed
49 posts
 
Pren,
Regarding Marakanetz's post, do yourself a favor and try the simple procedures I recommended before you despair. Oxidation and debris build-up have nothing to do with design or build quality. If that doesn't work I would contact Mark O'Brian at Rogue. Mark and his staff are extremely helpful and very responsive. FYI I have used my 88 Magnum and a Rogue 66 Magnum preamp almost daily for over three years without any issues other than the aforementioned which were easily rectified.
precbsed
49 posts
 
Scottht makes a good point. Cleaning the tube sockets did not eliminate the arcing right away but it did stop sometime thereafter so that may have had nothing to do with the problem. After reading Scottht's post however it did occur to me that at the time of the arcing I was using a fairly high-end power cord that was somewhat inflexible and didn't seem to connect as securely as the stock cord. I believe it may have been after going back to stock power cord that I no longer noticed the arcing.
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