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In Reply to: RE: Did I miss any of the 12AX7 replacements? posted by BCR on September 02, 2014 at 13:07:10
The 7058 is a direct drop in. A lot of 7058's are identical to RCA 12AX7. All 7058 tubes were made by RCA.
"What this country needs is a good 5 watt amplifier!" (Paul Klipsch)
Follow Ups:
A true 7058 is a drop-in 12AX7 replacement in many but not all circuits. One of my favorite tubes, I have 7058s branded RCA, GE, Sylvania, Westinghouse, and Raytheon. If they were all made by RCA, why is the construction different? 'Tis said that many 7058s, and specifically RCA, are actually disguised 12AX7s, in which case they are DEFINITELY drop-in replacements :-)
Because they are not true 7058's. Jim Cross, who is a member of a tube historical group (and a very good tube dealer) provided to me the history of the 7058. He told me that all of the real 7058's were made by RCA. Tubes are well known to be mis-marked on occasion.
"What this country needs is a good 5 watt amplifier!" (Paul Klipsch)
Edits: 09/06/14
Did he also tell you that a true 7058 is a drop-in replacement for 12AX7 tubes in all circuits, in which case I would definitely question his bona fides, at least from what I have read in numerous places.
Edits: 09/06/14
No, he did not. The 7058 does not have a center tap, which means it cannot work in a 6.3V setup. (I) should have made that clear in the original post.:-)BTW, I agree with you on the fact that it is also one of my favorite 12AX7 types.
"What this country needs is a good 5 watt amplifier!" (Paul Klipsch)
Edits: 09/06/14
Yeah, the only problem with 7058s is that they seem to have been "discovered." I used to get sleeves of 5 or batches of 15 on Ebay -- NOS at that -- for under two bucks a tube. Now they go for ridiculous prices. Good thing they're rugged and long-lasting. I gather they were originally produced to serve in car and truck radios, way before the solid state era.
They were indeed designed for mobile applications. The 6681 is another tube that has been discovered. If you look hard, you can still get them for less than 12AX7's
"What this country needs is a good 5 watt amplifier!" (Paul Klipsch)
Thanks, I missed that one.
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