the sonic top echelon from siemens germany! w/ siemens box this 1959 earliest edition is a very rare tone type
first run 1950s siemens sonics surpass all later production via higher resolution and warmer frame grid internals
incredibly popular 6dj8 6922 plugin sub, these have more: head room, low-end bass kick, and upper register detail reveal
siemens tubes are also regarded as reference grade, musical warm involving and less sibilant than amperex bugle boys
this brings more extension depth especially important for instrument delineation, vocal fidelity, and lush cymbal splashes
the crimped getter neck delivers holographic linear transparency and bass extension, pure uncolored sound reproduction
 dj4=9k etch code germany seam top authentic collectible w/ siemens box and free postage!
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often compared to telefunken, siemens tubes have less compression and more depth resolution, phenomenal mid-band imaging
top ranked must-listen lively upgrades for stereos, preamps, rode k2 ntk mics + hifidelity apps... upgrade your sound today!
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well balanced for gm conductance, fully tested 95/90 % mutual gm (65 % good) 
our unique mutual gm output test applies 225 vdc simulating actual circuit operations w/ filtered dc!
all tubes also undergo an important life test, a key longetivity indicator often overlooked by other sellers
mutual gm scores = current transfer ability, especially important for push pull amps
also twice tested for unparalleled accurary! via legendary tv7/hickok 539c
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full sound auditioned w/ closed back high resolution monitors and aira preamps
give 100+ session hours w/ your specific amps voltage to fully cure (break-in is important)
we pride ourselves on a proprietary complimentary value-added complete refurb screen and deox process
ships well packed worldwide
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also see our official site! reserve/request options and new part number list below
authentic vintage hifidelity audiophile / preamp / mic tube curation by caliacoustics
including limited special editions + rare true-nos sealed box + pinched waist
also high-resolution headphones + premium vocal stage and studio mics
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6dj8 7dj8 6922 7308 / ecc88 pcc88 e88cc e188cc cca
12ax7 12at7 12au7 12bh7 / ecc83 ecc82 ecc81 e82cc
6bq5 6au6 6267 6ca7 6ca4 6aq5 / 6v6 6l6 6sl7 6sn7 5y3 5u4 5ar4
5814 5751 5965 6189 6201 7062 7189 / cv2492 cv4004 cv455 cv4085
el34 el84 ef86 ef94 ez81 ecc85 e180cc e80cf gz34