Svetlana SED "Winged C" 6550C

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  • Regular price $69.95

NOTICE: Be sure to enter the Make & Model of component you are purchasing tubes for. Failure to do so will delay processing of your order. We do not ship tubes without this information.


IMPORTANT NOTE: Do not purchase these tubes for Audio Research products or other hard-on-tubes products. These tubes came off the assembly line with low vacuum. They will burn out in everything, with the exception of PrimaLuna components.

We will cancel and refund any order for this tube not bound for a PrimaLuna.

Unfortunately, it looks like the era of the SED Winged C tube has come to an end. These tubes have been a personal favorite of Uncle Kevin for years. But now the factory has ceased production, and we are running out fast. The people responsible for getting them into the U.S. have been less than stellar in my opinion. So we bring them in direct from Russia. They are perfect as perfect can be, but the last batch of these tubes to come from the factory haven't been as rugged as earlier vintages, so we are not recommending this tube into difficult amps. If you have questions as to whether or not these will be suitable for your gear, shoot us a quick email; there's a Product Inquiry tab right here you can fill out and we'll get right back to you.

Pricing above includes a 72 hours burn-in, and custom matching in any quantity you need at no extra charge.

All power tubes are Platinum Screened & Tested to the highest standards, including a 72-hour burn in process, and testing at real-world voltages.

Every power tube is different. This applies especially to power tubes like EL34, 6550, KT88’s, etc. Two tubes can be brand new in the original box, with one testing at [as an example] 6500 micromhos, the next one at 8600 micromhos. Both tubes would be considered "new" by the factory, and not defective. While the weaker tube isn’t "defective," it will certainly have a shorter life. So if you pay 10% less, you might get a tube with a significantly shorter life. The big lie from manufacturers of tube equipment and tube dealers themselves is that they “reject” these tubes. It’s not true. You can imagine the nightmare that would create for the tube factory if people are sending back 50% - 80% of the tubes that get shipped, coming back in all kinds of condition.

As the owner of Upscale Audio, a company that has supplied tubes into over 50,000 components, and someone obsessed with treating your amp like it’s my amp, I can tell you in no uncertain terms the factory doesn’t take them back. The only tubes they will take back are tubes that have shorts, gas, or measure BELOW the minimum number they assign for that tube type (it varies from type to type, so don’t bother trying to figure that out).

I’ve overcome that issue for you. I can say with calm assurance that we pay the factories more for our tubes than any other tube seller, and we ensure that we receive the absolute cream of the crop. This flies against the logic of how to run a business: The way you make money is to pay less for the goods you sell! That’s what most ANY business owner will tell you. We also don’t sell certain brands of tubes because while they might be cheap and sometimes good, they can be more trouble than they're worth. We pass on a lot of money as a result.

Upscale Audio is the only dealer that does what we do on a grand scale, and have a deep understanding of high end tube electronics. We’re the only dealer that manufacturers give a thumbs-up to, and recommend to their customers. And I promise you only the best.

- Kevin Deal


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