NOS Siemens EL84 6BQ5 1961 Matching Quad Excellent!

(One quad remaining)
Very rare, unused in original box, matching quad of Siemens Halske EL84 output tubes, made in Germany 1961. Considered by many to be the finest sounding EL84 6BQ5. 
Manufactured during Siemens golden era of tube manufacturing in the early 60's, these are the real Siemens & Halske not the 80's tubes (RTC) you see offered elsewhere on the web.  They were boxed and branded by Sonotone who sold a select line of premium tubes mostly from Europe in the 60's. Possibly the last cache of these REAL NOS anywhere, I have 3 matched quads available. All have matching Siemens embossed 61 date codes and are closely matched for plate current draw on my Hickok 539C. Great in Shindo Montille, Manley/ VTL, Audio Note, or vintage Scott Fisher, Eico Leak etc. Price is $260 quad FIRM plus shipping. $5 in the US or $15 to Canada. All of our tubes are guaranteed and come with a 6 month warranty.  This is a full contact ad, Please EMAIL me at [email protected]. Thanks.