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 Post subject: Can someone ID these tubes?
PostPosted: Feb Mon 26, 2018 5:37 pm 
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Joined: Jun Wed 04, 2014 2:56 pm
Posts: 9
These tunes have no marking on them. How would one find out what they are? They look like 3-500 or 4-400 to me.
Can anyone help?


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Last edited by Wiradio on Feb Mon 26, 2018 6:27 pm, edited 1 time in total.
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 Post subject: Re: Can someone ID these tubes?
PostPosted: Feb Mon 26, 2018 5:42 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 37069
Location: Livermore, CA
A photo should help? Could go by internal structure? Check data sheets.

https://frank.pocnet.net/sheets/088/3/3-500Z.pdf

https://frank.pocnet.net/sheets/088/4/4-400A.pdf

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 Post subject: Re: Can someone ID these tubes?
PostPosted: Feb Mon 26, 2018 6:28 pm 
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Joined: Jun Wed 04, 2014 2:56 pm
Posts: 9
Sorry it took me a few moments to get this pic posted....


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 Post subject: Re: Can someone ID these tubes?
PostPosted: Feb Tue 27, 2018 7:45 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1260
Location: Orlando, FL, USA
Most likely Eimac 4-400s, but there is nothing in the picture that gives a good scale.


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