SOLD - FOR SALE: NOS Pair RCA 12AU7 Tektronix Matched Serial Numbers Original Box
Item #649347271Info: NOS Pair RCA 12AU7 Tektronix Matched Serial Numbers Original Box
||Cash, Paypal, Interac/EMT
||11 - New (?)
Apr 11, 17 6:00am (PST)
Edited: Jul 03, 17 5:15pm
Port Hope, ON
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** This Ad is Marked as SOLD by seller and cannot be responded to. **
NOS pair of RCA 12AU7 tubes. Tested with matched serial numbers by Tektronix. February 1976. Original Tektronix tested stickers on tubes. Original box. Both tubes test well over 100%.
EMT or cash.
Ontario and Quebec: $12 shipping.
Rest of Canada slightly higher.
Blurb from internet:
Tektronix was the leader in high MEGAHZ machines. They were doing some really fast switching. Tektronix was building equipment that was on the leading edge of tube technology. They did things that required careful matching of tube characteristics, such as 18 tube distributed vertical amplifiers. Some of their circuits, by virtue of their being flat from DC to 100MHz, or so required tubes that had unusually stable characteristics. They needed the tubes to meet very high standards in some critical circuits. At times only a single manufacturer made tubes that met those standards. Because of these special needs, Tektronix had a department dedicated to testing and matching vacuum tubes. They assigned, special part numbers to these highly tested and selected tubes. These tubes were selected by Tektronix for use in critical sections of precision testing equipment. They were hand selected for GM values and balance (within 2% per section). They also were checked for NOISE. They are the lowest noise tubes you can find for the brand selected. That is what the CHECKED STICKER are all about. Tektronix was very picky about the components that went into their equipment.
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