GT-6550-R Duet
Item # 219165 | Customer Ratings:
(Based on 2
reviews)


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Blemished items are customer returns, open box, ding n dents and re-stocked items. These items are in great condition and very similar to new, except for packaging that may show wear or may not be original. Not covered by manufacturer warranty, but covered by our 30-Day Satisfaction Guarantee.
Mint Condition: This instrument or product has been carefully played/used and returned to us in virtually new condition, however its packaging may not meet the standards set by the factory. Also, it no longer carries the manufacturer's warranty. If you're looking for a virtually new instrument in possibly less-than-perfect packaging, this is a great value. We feel so strongly you'll like what you see, we're including our 30-Day Satisfaction Guarantee to this used product making it a no-risk purchase.
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Searching serial numbers
Blemished items are customer returns, open box, ding n dents and re-stocked items. These items are in great condition and very similar to new, except for packaging that may show wear or may not be original. Not covered by manufacturer warranty, but covered by our 30-Day Satisfaction Guarantee.
Mint Condition: This instrument or product has been carefully played/used and returned to us in virtually new condition, however its packaging may not meet the standards set by the factory. Also, it no longer carries the manufacturer's warranty. If you're looking for a virtually new instrument in possibly less-than-perfect packaging, this is a great value. We feel so strongly you'll like what you see, we're including our 30-Day Satisfaction Guarantee to this used product making it a no-risk purchase.
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GT-6550-R Duet
90 day warranty on power tubes, includes replacement of whole set if one tube goes bad.
180 day warranty for preamp tubes.
3 year warranty on SubstiTubes and Solid State Rectifier.
Check with M-Audio for warranty on GT microphones.
Now you can get added warranty protection for your new gear. Pro Coverage steps in where the manufacturer's "normal wear and tear" ends. Our PRO COVERAGE program offers you UPGRADED COVERAGE if your product ever fails!
Pro Coverage includes:

I bought a matched pair for my Marshall JCM 900 50 watt a few years ago and made it sing. I now have a JCM 800 2203 and I'm getting 4 of these for it. Compared to EL34's they have more power for a thicker heavier sound and yet when you roll back on the volume it gets clean like Marshall does. I love these and will never use any other.
I purchased the 6550's 1-3 rating. I've had this amp for close to 20 yrs and had GT's in them and recently switched to try some KT88's. I can't necessarily say the KT88's were bad because in the amp I tried to set the bias but it was max'd and would have had to perform a mod to the amp to match the tubes. So I never heard the potential of the 88's and actually use them for a longer life clean tone and helps playing at lower volume levels. Although when I want to rock, clean or distorted, nothing beats the 6550's hitting the sweet spot with the marshall. I have early Ibanez that just loves distortion and an EJ strat that sounds great with the clean tones. The bias is set for these tubes, they run hot, bet great sound, but realize they will have a shorter life than the 88's, but worth it.
