> Classifieds > > > RCA 12ax7 Black Plate Vacuum Tubes 17mm Pair

FOR SALE: RCA 12ax7 Black Plate Vacuum Tubes 17mm Pair

Item #649443414
Info: RCA 12ax7 Black Plate Vacuum Tubes 17mm Pair

Asking Price:
USD $85.00 Buy It Now
Payment method: Paypal
Shipping weight: 0.45 (kg) Calculate Shipping
Condition: 9 - Excellent (?)
Date Posted: Jun 13, 18 2:10pm (PST)
Edited: Jun 13, 18 2:10pm
About Seller: directmetalmonster
BROOKLYN, NY
United States
[other classified ads]
External Feedback: justin3414 (258)
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Days in System:7
Ships to: United States, Canada, Worldwide
Shipping Cost:
  • Worldwide: $15 (standard
  • United States: FREE
  • Canada: $12 (standard)
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Description

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Purchased for my Primaluna Prologue Four amp and performed exceptionally well. Both are in great shape with plenty of life left in them. No longer need them so they must go to a new home/amp.


This matched pair RCA 17MM plate, slant-, square-getter, black-plate 12AX7 dual triodes was tested on a Hickok 600A for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 1000/1000 micromhos for Tube One and 1020/1100 micromhos for Tube Two. (12AX7s typically test within one standard deviation of 1250 micromhos).


"They are dead quiet when the preamp is muted and have excellent frequency response, sound-staging, and dynamics. These are among the earliest 12AX7s made and both appear to have been made in 1956, perhaps at the very moment President Eisenhower was golfing..."



This ad was originally posted on US Audio Mart US Audio Mart and the seller ships to the United States, Canada, Worldwide.



Includes:

1 pair of 12ax7s RCA



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