jimjimbo Posted August 16, 2019 Share Posted August 16, 2019 I am almost out of the RCA cleartops offered earlier (3 pairs left at $29/pair shipped), however, I do have 15 pairs of Conn organ marked (Sylvania) green label 12AU7 tubes available. These were specially selected by the manufacturers for low noise and microphonics, and they sound great. They are a bit dusty and I have cleaned them up as best I can without trashing the labels. Long grey plates, copper rod supports, chrome top, and top getter. Pins are clean and straight. All have been tested on my calibrated TV-7 tester and I have put together very closely matched pairs. All pairs test at NOS levels. Only $19 per pair, shipped to your door in the US. I usually ship next day. Please PM me with interest. Quote Link to comment Share on other sites More sharing options...
BigStewMan Posted August 16, 2019 Share Posted August 16, 2019 i don’t have a tube amp; but, do love them. just curious, how many hours can you get out of pair of tubes? if you listen at loud levels does that reduce tube life? go ahead and laugh if those are stupid questions .. i’m asking for a friend. Quote Link to comment Share on other sites More sharing options...
jimjimbo Posted August 16, 2019 Author Share Posted August 16, 2019 No, not bad questions at all. Several factors come into play, so it's hard to answer exactly. Not necessarily in order or all inclusive..... 1. Type of tube, ex. Power (6L6, 6550, etc.) small signal (12AX7, 12AU7, etc), rectifier (5U4, 5Y3, etc). 2. How hard they are driven 3. Number of on/off cycles 4. Type of circuit 5. Ambient temperature within and around the amp 6. Manufacturer and construction Perhaps @tube fanatic and/or others could add to this. Quote Link to comment Share on other sites More sharing options...
thebes Posted August 16, 2019 Share Posted August 16, 2019 Small tubes can last up to 10,000 hours and beyond. Power tubes much less. These are small tubes. Quote Link to comment Share on other sites More sharing options...
joessportster Posted August 17, 2019 Share Posted August 17, 2019 "tube cheapskates" I resemble that remark Quote Link to comment Share on other sites More sharing options...
jimjimbo Posted August 18, 2019 Author Share Posted August 18, 2019 Sunday bump Quote Link to comment Share on other sites More sharing options...
jimjimbo Posted December 16, 2019 Author Share Posted December 16, 2019 Still got a bunch of these. Buy some for stocking stuffers....... Quote Link to comment Share on other sites More sharing options...
jimjimbo Posted April 27, 2020 Author Share Posted April 27, 2020 Bump for some great value tubes. Quote Link to comment Share on other sites More sharing options...
joessportster Posted June 6, 2020 Share Posted June 6, 2020 bump Quote Link to comment Share on other sites More sharing options...
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