Excellent feedback both here and on our other site!! Superb matching pair!This pair matches extremely well internally and externally 4% at running high voltage, not just low tester voltages . Average internally for most 6900 tubes is 8-10% and higher. ULTRA Rare Replacements for 5687 and 7119,7044 tubes. EXCELLENT NOS PAIR of 6900 Tungsten Pin made in USA by Tung Sol in the 1960's . Bendix also purchased the vast majority of its 2nd generation 6900 stock from Tung Sol. Tung Sol's are less prone to gassy issues than are the original Bendix version. Extremely rare and the best small signal tubes you will ever own. Original Tung Sol's are the cream of the crop for 6900 types and very difficult to find. Both of the tubes have been relabled by MU Inc in California. This was from the batch that MU purchased from Tung Sol and retested yet again when they recieved them. Our last gold pair went for $725, Tungsten pair for $600. Great for Audionote, Loesch, an many other amps and preamps. Truly the very best sounding all all the twin triodes we've ever auditioned. They best the ECC32,33,34,35 all the 5687 and 7119 (7044) types, as well as any 6SN7 we've heard, 7788 triode wired, any E88CC, EC8010, 417A, 437A's etc. Ceramic insulators, heavy Nomex glass, gold grid wire, tungsten pins , microphonic reducing springs, etc. These are tested at 500G's and rated at 300G's / 300 degrees C. Heater to cathode rating is a whopping 450v. Excellent as an output tube as well as a driver or line stage tube. Soundstage is breathtaking. Very low tight deep bass, tons of micro detail and subtle shadings flow from the stage with sweet smooth highs that extend higher, effortless dynamics , these tubes do everything correctly. As for measurements>> We compared them to 6SN7 's without feedback , or 12AX7's without feedback >> 12AX7 frequency response is flat to only 11,000hz or so. The 6SN7 typically will do 25 to 30,000hz. The 6900's are flat without feedback to nearly 100,000 hz!. Tested on Tek scope with Tek frequency generator. These are rated at 10,000hours in a pulse application. Audio circuits will see longer life. Great tubes!!! We have singles for sale as well. We also have a plain pin pair listed and we also have a quad of these. A total of 6pcs will be sold from our collection. Tested on a Hickok 15750 tester as well as a TV10 and an A-118B , these tubes all test in the 10,000 to 11,000 umho range . These are from our personal collection. Zero gas or grid current. Perfect tubes.
These are rare tubes and getting rarer by the day, because we USE them , unlike most antiques that just collect dust. NOS , PAIR but shipping will be combined if you purchase other items. Call if you need more info on this or other tubes or would like us to list something that you are searching for with a Buy it Now. Thank you for looking! .Items will be packed extra well so that they do not incur damage and will be sent Priority US Mail. Buyer may choose Parcel Post or other shipping as well. Ask if buying requires another method than the one shown. Buyer is responsible for insurance if required.