Another Forum Thread with comparisons against other 12AX7′s, this time from audioaficionado.org
http://www.audioaficionado.org/tubes-valves/9264-got-my-psavane-12ax7s-today.html
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I have Telefunken 12AX7… and I like Psvane 12AX7 a lot
I happen to be one of those lucky folks that has a pair of NOS Telefunken 12AX7s, complete with musty boxes…
I’m of the opinion that the best tube is dependent on the circuit it is going into. I’ve heard some circuits where the Teles sound great, and others where I preferred other tubes.
I wouldn’t have believed…
from William W.
I received a pair of your new copper foil caps (.22uF) yesterday and immediately installed them in my Yamamoto 45 amp as a coupling cap between the driver and power tubes. They are already remarkable after a few hours burn-in. I wouldn’t have believed how much they improve this wonderful amp. –William W
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.
Posted in ~Tube FAQ & Must Read ~
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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.
Posted in ~Tube FAQ & Must Read ~
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12AX7-T outshined any tube I have ever tried (including RCA)
Feedback received from AK member – Ron:
Posted in 12AX7-T, Review & Feedback
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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’
How is 845 like when dead?
Some forum members had a shorted tube – here is a picture of how it looks like (credit to AudiogoN member ‘amfibius’) when the event happens:
Here are some explanation from Psvane tube engineer about the event:
Psvane T-series ‘black bottle’ 300B-T, CV181-T and KT88-T launched
After rounds of testing and improvement over the test runs, Grant Fidelity is now ready to officially launch the Psvane T-series black bottle tubes to the market outside of the Greater China Area. It includes 300B, Kt88 and CV181 (6SN7) for the time being.
