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Tracking down a hum.

Today when I powered up my system, I noticed a hum from my tube pre amplifier, a Rogue Audio Model 99 (line stage only). It is worse when first powering up. It is absent through my headphones, (using an external headphone amp and the record button on the pre-amplifier)  Listening to speakers the noise is present but diminishes and eventually goes away as the system warms up.
I'm using the Rogue to send a signal to a Musical Fidelity X-P200.
I don't think the issue is the tubes as I'm using Tung-Sol 6sn7 tubes with less than 300 hours on them.
I bought this Rogue used and had to take it back to get it fixed as one channel kept cutting out because of a bad solder in the out put jack. Maybe something else failed?
TIA

dierksb
dierksb OP
47 posts
 

Mine is a line stage. Look for a small orange and white switch it's upright and small, near the transformer.
I was able to find it without too much trouble

dierksb OP
47 posts
 

Well after the weekend the noise is back. It's through the speakers and independent of the volume control. It goes back to Rogue this week with my contact information and a description of the problem.

noromance's avatar
noromance
9,482 posts
 

That's a drag. Interested to hear what's up. 

dierksb OP
47 posts
 

Sending it to Rogue. I'll post here what they tell me the issue is.

 

dierksb OP
47 posts
 

@noromance and others. I got a call from Rogue today. It's repaired. They replaced 6 components. A bunch of capacitors in the power supply and a resistor in the voltage regulator. Cost $255.00 all told. Disaster has been averted no explosions.

 

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