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In Reply to: RE: Beg to differ. posted by Dave Pogue on September 06, 2014 at 05:12:03
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: 09/06/14Follow Ups:
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)
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