BBZink Posted May 28, 2016 Share Posted May 28, 2016 Good Day, i have a Dynaco st-70 back-up amp, but i learn this week, that my preamp tube are now discontinued. Any upgraded possible? 12ax7? price for 7199 are skyrocketing? so i am searching alternative and if possible, better sound? Also i have el34 Mullard, new stuff, will it sound better with 6ca7 big bottle E-Harmonix? regards Tpjrs Quote Link to comment Share on other sites More sharing options...
djk Posted May 28, 2016 Share Posted May 28, 2016 https://d1sjrnpi226dnf.cloudfront.net/spree/attached_files/7199_6u8.pdf?1382390378 2 Quote Link to comment Share on other sites More sharing options...
Marvel Posted May 28, 2016 Share Posted May 28, 2016 (edited) https://www.tubedepot.com/products?utf8=%E2%9C%93&keywords=7199 You could swal out the front end with something better. Edited May 28, 2016 by Marvel Quote Link to comment Share on other sites More sharing options...
BBZink Posted May 28, 2016 Author Share Posted May 28, 2016 https://www.tubedepot.com/products?utf8=%E2%9C%93&keywords=7199 You could swal out the front end with something better. Expensive, if i had, shipping, taxes (15%) and exchange (30%)+ custom... Quote Link to comment Share on other sites More sharing options...
BBZink Posted May 28, 2016 Author Share Posted May 28, 2016 https://d1sjrnpi226dnf.cloudfront.net/spree/attached_files/7199_6u8.pdf?1382390378 Like it, but no 12ax7, solution? Quote Link to comment Share on other sites More sharing options...
djk Posted May 28, 2016 Share Posted May 28, 2016 (edited) "Like it, but no 12ax7, solution?" A 12AX7 is a dual triode, a 7199 has a triode and a pentode in the same tube (as does the 6U8A). In the Dynaco the pentode is for voltage gain, the triode is the phase-splitter. Edited May 28, 2016 by djk 1 Quote Link to comment Share on other sites More sharing options...
BBZink Posted May 28, 2016 Author Share Posted May 28, 2016 (edited) Ok next question, is the 6ca7 better than the mullard el34? regards Edited May 28, 2016 by tapajeurs Quote Link to comment Share on other sites More sharing options...
Wingfield Posted May 28, 2016 Share Posted May 28, 2016 In my CJ MV60, I prefer the EH6CA7 over the Mullard EL34. The 6CA7 sounds more extended on top and lively. 1 Quote Link to comment Share on other sites More sharing options...
petercapo Posted June 17, 2017 Share Posted June 17, 2017 Dynakitparts sells an adapter for the more readily available and less expensive 6GH8 http://www.dynakitparts.com/dynakit-products/tube-sockets-adapters/9-PIN-SOCKET-ADAPTER Here's an interesting video about replacing 7199 With 6GH8 https://youtu.be/hol6ZEv7fR4 Quote Link to comment Share on other sites More sharing options...
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