Are they made by GMC? :)
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Yes as Bombaywalla started above we did make the Sierra Audio Denali Amplifiers, its bigger brother the Everest and the matching Preamp the K2, These were made around year 2000 so any of them will have some mileage on them, although this should not deter you, they were built to last. Should a repair or overhaul be needed we are certainly here to help.
You should also check our website for our current offerings, The Olympia Amplifiers, and for a more economic approach the Liberty Audio Site for our direct to the consumer offerings.
http://pbnaudio.com Click on the Audio Components tab for Amplifier info