organeamps valve tester looks pretty nice, but it is limited in what tubes it tests - apparently doesn't test 6922, 5687,5841, 6sn7, 6sl7, KT 90, KT 120, KT 150 just to name a few ; many more that it doesn't
How to select a good set of vacuum tubes?
- First, the appearance of screening
- The glass bulb is clean, transparent and crack-free.
- The core column is vertical, no shaking when shaking, no abnormal sound.
- The glass bulb is well integrated with the tube base, no looseness.
- the pins are smooth and not loose.
- The tube’s diameter and height of the paired tubes are basically the same.
- Second, vacuum tube stability screening
- Third, vacuum tube plate current screening
- Fourth, pairing screening
FQ level: plate current pairing, the pairing standard is consistent with the factory. (We use this kind of matching method by default)
PQ level: plate current + transconductance pairing, paired product plate current error Ia < 5%, transconductance GM < 5%. This level of matching products needs to be booked in advance and an additional handling fee will be charged usd 5.0 / pc.
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Finally, thanks to the OP for his excellent information... it is going in the vaunt of audio reference material. I agree with Tomic, without reservation. I am put off with the arrogance of the large tube seller in SoCal, but he has excellent tubes. Jim McShane is always reliable and sells well-tested tubes at very fair prices. To tell you the truth, nearly all my power tube purchases are from Shuguang. They are much better than nearly all my NOS vintage tubes, albeit pricey. |
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https://orangeamps.com/products/accessories/amplifier-management/valve-tester/ I do not know anything in tubes but I have just received an Email from a McIntosh dealer about that product. |