RCA 12AX7 (1952) Originals Matched Pair--NOS Test Try the REAL RCA 12AX7
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| Condition | |
| Payment methods |       |
Contact seller after sale to pay viaCertified check | |
| Ships from | West Chester, PA, 19380 |
| Ships to | United States |
| Package dimensions | ?" × ?" × ?" (1.0 lbs.) |
| Shipping carrier | unspecified |
| Shipping cost | Specified after purchase |
 Average | Research Pricing |
CONUSA SALES ONLY, unless you email before hand. Thanks.
RCA invented the 12A*7 series in around 1947-1948. Production ramped up in 1949, when European makes were still in the caves for small preamp tubes. From 1949-1952 or so, RCA kept the structure of the getter the same--a 'stirrup' D getter with a welded cross-bar across the stirrup (think of the manual labor to do this!), rather than a curved D (single piece bend of the metal).
The point is: the later RCA 12AX7 from '54-58 sound poor to my ears. Too warm and fuzzy. These earlier versions are more extended with better focus in the mids and tighter bass.
This is a matched pair with 1952 date codes, with exactly the same construction, so you know their sound will be matched. Test like new--I used these in my Quicksilver M-60 blocks for a couple of hundred hours. These early RCA 12AX7 are very, very long lived tubes!
If you are using 5751 tubes--give these a try; you might be quite surprised how much better they are than later version of RCA 12AX7--or even 5751!
Hickok Dynamic Conductance Gm data (1000 is min and 2,000-2,200 is typically NOS)
2200/2200 RCA 2-48
2100/2100 RCA 2-04
Eico Dynamic Emission %NOS data (80 is the min and 120 is typically new):
140/140 RCA 2-48
134/140 RCA 2-04
Fantastic match of matched 1952 RCA 12AX7 NOS-spec data. Satisfaction guaranteed.
Thanks for looking. Please see my other ads for the best-of-the-best tubes in 12AX7 (and soon others).
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Return Policy
Return Window
Item can be returned within 3 days of receipt.
General Terms
Items must be returned in their original condition, with all included packing materials and no signs of use. Buyer assumes responsibility for all shipping return costs unless the item was not received as described.
Refunds
Buyer will receive a full refund in the original payment method less any shipping charges.
Special Conditions
Buyer will be responsible for all shipping charges and any out-of-pocket expenses on my end if items are as advertised, but returned. Item MUST be returned in same physical/visual condition and for vacuum tubes, must test as originally stated, including original box, if an original box was included. Seller maintains right to decline sales to low or no feedback members, unless we communicate beforehand. Thanks.
