Jeg testede selv et læs NOS indgangsrør her i vinters...
Alle var fabriksnye NOS
Jeg har skrevet kort om deres konstruktion, idet der er mange måder at lave et rør af samme type på. Min test drejer sig om 12au7/5814/ecc82 røret.
De står beskrevet på engelsk da jeg oprindeligt har omtalt testen på et internationalt forum 
Rørene var:
Siemens E82CC – short ribbed plates, triple mica, round getter.
RCA 12au7a – short ribbed plates, 100% clear glas top! Side mounted square getter.
Siemens ECC82 – short smoothed plates, round getter.
Valvo ECC82 - short ribbed plates, round getter.
GE 5814A - short ribbed plates, round getter.
Tesla ECC82 - very short smooth plates, combined double square/round getter!
RCA 12au7 Mexico - long ribbed plates, round getter.
Electronk ECC82 - very short smooth plates, oversized body, very small round getter.
Sylvania 12au7 – long Black ribbed plates, square getter.
Tungsol ECC82 – short smooth plates, Black top! And massive round getter.
Lorenz ECC82 – long ribbed plates, round getter.
Mazda ECC82/XII-6 – totally smooth plates, round getter.
Sylvania 6189 JAN - long ribbed plates, round getter.
Matsush*ta 12au7 2L+2L – short ribbed plates, oversized 45 degree angled round getter!
Mullard 12AU7 – 1960 model, short ribbed plates, round getter, black top.
Minwatt 12au7 DARIO, short ribbed plates, round getter mounted with 20 degree angle.
Brimar 12au7 bva – 1960 model, long ribbed plates, round getter.
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Rigtige højttalere er lavet af massivt ægte træ!