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In guitar amps & hi-fi (CJ, EICO & Dynaco, most recently). The 1990-2000 made Svet's (St Petersburg) and JJ E34L have a much richer texture & good harmonic quality to me (and the owner of those hi-fi amps), than the Siemens (RFT).

All tubes biased to original amp & tube manufacturer's specs. Run in over a good week. Bias rechecked.

My opinion.

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  Michael Percy Audio  

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