I purchased the Sovtek 6L6 valves to replace Electro Harmonix 6L6 valves in my Kustom Defender amplifier. My feeling is that there has been an impovement in comparison to the older valves ... this maybe down purely to wear and end of life. The Sovteks have been gigged twice ... excellent !
After reading many tube reviews I replaced the tubes in my 1970s silver face Fender Pro Reverb (tube rectifier) with the Sovtek's. Guitar - Gibson ES355 straight in with no effects amp sounds sweet and musical as ever. Very little noise from tubes even at volume. Tubes appear quite sturdy. I'm no tube expert but I can't see why would you pay more for 6L6 tubes just because they are in a boutique branded box. - Hope this helps someone - Mike
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