[Amps] Best place/type 3-500Z tube ?

[R.Measures]

€  Is there a problem with the original tubes?

>Can anyone please tell me the best place to buy a pair of new 3-500z tubes 
>for my Henry 2K-4?
>
>What brand should I buy?
>
>TNX and 73, 
>John w5gi
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-  R.L. Measures/Rich..., AG6K, 805.386.3734, www.somis.org