2. amps-preamps
  3. 191984-194577

Audible Illusions Modulus 3A troubles

Just purchased a used Audible Illusions Modulus 3A preamp for my system but only getting very very faint sound when turned all the way up.  Plus the very very faint sound is very fuzzy as well. 

I popped off the top & re-seated the 4 tubes but that was no help.

My 2 amps are both rated at 50k ohms input sensitivity, so this is the right preamp for them at around 1.2k ohms output sensitivity, running a biamp configuration.  AI documentations confirms this.

I've tried each amp on its own, using both output RCAs on the preamp, to no avail.

How to tell what is wrong...looking into the return policy, but at least the shipment was insured.

Any ideas?

Thanks-Kevin

kevinshunt
jew16384's avatar
jew16384
59 posts
 

Measure power supply voltage.

wheezer1
4 posts
 

Greetings,

It sounds like the push-buttons, one or more.

Push them several times and try that. Then use compressed air. Then Deoxit.

Less likely is the selector but spin that gently.

Even less likely are the tubes. Post pics or contact me via PM.

I've been repairing and referbing them for over 10 year.

Cheers,

Wheezer

kevinshunt OP
17 posts
 

Seller replicated the issue and the fix they did was to install a new power cable from the outboard power supply to the unit,  should get it back soon, looking forward to hearing it in my system.

Thanks everyone tor your advice,

Kevin

hiend2's avatar
hiend2
424 posts
 

Good news you will love the unit,

Thank god you did Not return it to the Art Factory

wheezer1
4 posts
 

Hello Kevin,

Happy to hear the seller will return it to functional state.

Please understand you cannot use ANY NOS tubes in an unmodified AI. You'll be good with the aforementioned Russian tubes.

Regards,

-W

More to discover