The MESA EL34 STR 450 is a Genuine "A" quality NOS (New Old Stock) German made Siemens EL34 - This is a legendary European EL34 known for its unsurpassed "bell-tone" clarity and touch sensitive sustain & articulation - Premium German engineering provides unsurpassed structural quality that makes this one of the most consistent and reliable EL34s you can buy.
The NOS Siemens EL34 STR 450 tubes are an exceptional upgrade for our Triple Crown TC-100 or TC-50, or any of our amps with EL34 Bias Switches. Using these tubes is a fantastic way to explore new tonal possibilities and impart additional vintage flavor & flare with your amp.
We test and match our tubes while under the stress of actual operating conditions, to the tightest, most demanding specifications in the industry with our proprietary aerospace-designed tube analysis system called Robotube. Only the absolute FINEST tubes are excepted. And then, as evidence, are backed with the best warranty in the business for a minimum of six months! Testing and Matching capacity is where confidence and true value come in. In the case of any MESA tube, you can install with complete confidence of guaranteed premium performance from the world’s leading designer of custom, hand-wired amplifiers.
Please note: These tubes are not recommended for use in amps with plate voltages over 450 volts. It isn't uncommon for a grid leakage indication to appear when testing EL34s in certain tube testers. This does not indicate a failed condition for a guitar amplifier. Not all tube testers test for parameters relevant to a tube guitar amplifier.