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Category Archives: ~Tube FAQ & Must Read ~
The confusion of Shuguang Treasure tube quality grade and price
The internet market place now has many vendors peddling the ‘black bottle’ Shuguang Treasure tubes at various prices for various grades. It has caused great confusion to consumers, if someone doesn’t want to take the time to read and understand about quality control and testing method to tubes.
Tubes may look the same – but test results are NOT.
In the past, most Chinese tubes (including high end tubes) are sold over internet without adequate distribution quality control. Some consumers are confused about the quality grade on the Shuguang Treasure tubes and wonder if all Premium tubes out of factory are the same, and if the factory test readings are accurate.
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Can I hear the difference if tubes are tested different?
The answer is – it depends on the test results.
A weak (low) emission tube will last shorter time than a strong one. But you may not hear the difference when both tubes are within operating range. When a tube emission gets too low, the tube as part of the circuit is no longer operating at the optimal condition and will cause distortion in sound. It may also stress other parts of your amp causing equipment failure.
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Why Grade A tubes only have one test card in the box?
We provide Grant Fidelity Grade A matched pair or quad of tubes – these tubes are usually packed in one box with one test card showing the ‘plate current’ reading in ‘mA’
Tube compatibility issue
Please note that due the huge variation in tube amp designs, we as a tube vendor cannot guarantee our tubes are 100% compatible to your amplifier. Each tube model description on this website includes a spec sheet link – please feel free to forward it to your amp manufacturer to confirm compatibility before you make purchase.
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What’s the sound when I turn on the tubes?
Some tubes at start up will have a metal like sound from inside the tube. This is the plate materials being heated up and expand – this sound will disappear once the tube is turned on for a few minutes.
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Why my tube box isn’t in perfect shape?
Well, we audiophiles live on perfection but sometimes it’s hard to achieve. We make every efforts to make our tubes as high quality as we can, but sometimes the tube package boxes get damaged in wholesale shipping due to rough handling.
Do you offer matched quad?
In a short answer, yes!
Please add a note in your order if you do need matched quad. We will check our inventory and let you know if we have them readily available. There is no extra charge for providing matched quad but availability will be depending on stock.
Do you need matched quad?
I am a tube vendor, can I order at wholesale price?
At this time, we do not sell to online tube vendors.
If you are a tube amp manufacturer, we can provide OEM price for factory matched pairs only. Please provide your business license information and use the contact form to contact us directly for a quotation. Minimum quantity applies to commercial orders.
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Is the tube price for a pair, or a single?
All tube price on this website is for a pair. If you need to order single tube, please contact us to manually process the order.
