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| Reviews Summary for Chinese 811A Tubes |
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Reviews: 3
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Average rating: 3.0/5
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MSRP: $15-30
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Description: Available from RFParts, Ameritron and many other vendors at reasonable prices.
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More info: http://
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ZL1PHD
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Rating: 2/5
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Apr 12, 2008 20:27
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High failure rate
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Time owned: 6 to 12 months
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Bought a 3 tube AL811. Very nicely built amp, can't fault it. But the tubes are starting to drive me spare. These are the no name brand from China. 1st tube has a welt you can drive a bus through. On using it that welt was bright enough to read a book from, the other tubes had no anode glow. Got that replaced by Ameritron free of change, A+ for Ameritron for that. 6 months later another tube shorts out between the anode and grid supports on the top insulator. Gas? Getter is still silver. No idea why it shorted to start with. Apart from it now has a carbon track between the anode and grid! If these tubes are to be used in a circuit with a 1000 volt DC supply, ok. But who runs that lower voltage? Their QC needs to be uprated.
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OZ1GCT
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Rating: 5/5
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Jan 15, 2008 01:52
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Good so far
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Time owned: 0 to 3 months
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I have bought 4 matched SHUGUANG 811A from TUBEMAN.COM for my AL-811H, and no problems with them so far. Ken is a real gentleman to deal with
and deliver fast, safe and cheap.
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WD0CT
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Rating: 2/5
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Dec 3, 2006 02:40
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Oh for the good old days
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Time owned: more than 12 months
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My experience with Chinese made 811A tubes has been a learning experience. In one year I have had three of them go bad. Two shorted and one went completely gassy and burnt it's filament up. They are being used in a three hole Ameritron. I bought the amp new and a new set of 811A from Ameritron when I started having problems.
The amp is used strictly on ssb and the remaining three tubes have now lost some emission in less than a year of use.
To Ameritron's credit, they did replace defective tubes free of charge with a requirement to send in the defective tubes at my expense. I believe they are stuck between a rock and a hard place with finding a quality tube supplier.
A bit of research revealed that RFParts lists US made Marshall 811A tubes and makes quite good claims for them.
I don't know how many tube factories in China make 811A tubes but I am not impressed with my experience.
If you have had better luck, please let us know about it.
73 Steve
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