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Tube Testing

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Escott1377

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Tube Testing
« on: 25 Apr 2022, 09:46 pm »
Does anyone know a vendor that will test tubes - specifically for noise?

Tube Depot will test for operation, but I need to know noise since I would like to sell.

The tubes in question are a pair of EML 300B mesh tubes.

They have been boxed up for a while, maybe 1,000 hours on them???

Also, assuming these are not microphonic, anyone have a gauge on a decent asking price?

I think I paid around $850 or so for the pair when I purchased them.

Thanks in advance -
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FullRangeMan

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Re: Tube Testing
« Reply #1 on: 25 Apr 2022, 11:17 pm »
EML test its tubes for noise before shipping but after long travel tô the user noise may built in any tube.
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Rusty Jefferson

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Re: Tube Testing
« Reply #2 on: 26 Apr 2022, 12:23 am »
Vintage Tube Services will do a complete test service for a reasonable price, especially considering the cost of expensive 300b tubes. It does appear Andy is very busy with the tube hoarding that's going on so it might take a while.
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FullRangeMan

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Re: Tube Testing
« Reply #3 on: 26 Apr 2022, 02:01 am »
These guys have experience with noise testing but it dont require previous expérience just a tube amp with DC heating if you dont mind taking the risk of putting untested valves in your amp.
https://www.youtube.com/watch?v=13n1VCR6UXw
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