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Read the Post in new Window Read the Post in Threaded view  Post #159: "End of Live" tube set by AlexBerger on 2011-11-22 
Browse the content of the threads in new Window  Thread: The last phonocorrector: “End of Life" Phonostage in Analog Playback  310 Replies 
Romy,Thank you.I think I should to give some break-in time to Sylvania 0a2.50 hours is enough? Previously I used in my EAR the next set of tubes ECC83: 1-Amperex (red print), 2-Amperex (red print), 3-Sylvania 7025 (yellow print).When I built "End of ...

Read the Post in new Window Read the Post in Threaded view  Post #161: That crazy 7025. by Romy the Cat on 2011-11-22 
Browse the content of the threads in new Window  Thread: The last phonocorrector: “End of Life" Phonostage in Analog Playback  310 Replies 
[quote user="AlexBerger"]I think I should to give some break-in time to Sylvania 0a2.50 hours is enough? Previously I used in my EAR the next set of tubes ECC83: 1-Amperex (red print), 2-Amperex (red print), 3-Sylvania 7025 (yellow print).When I ...

Read the Post in new Window Read the Post in Threaded view  Post #21: 150V Gas Tubes survival guide. by Romy the Cat on 2006-09-01 
Browse the content of the threads in new Window  Thread: Gas voltage reference 0A2 tubes. in Melquiades Amplifier  42 Replies 
I remember when I built Melquiades I detected that quietly of wire that feeds the grid of output stage with bias, quality of soldering or any other minute detail on this  wire was very auditable. I also detected that the proximity of this wire t...

Read the Post in new Window Read the Post in Threaded view  Post #1: Gas voltage reference 0A2 tubes. by Romy the Cat on 2005-08-21 
Browse the content of the threads in new Window  Thread: Gas voltage reference 0A2 tubes. in Melquiades Amplifier  42 Replies 
Would anybody recognize who manufactured those 0A2 regulators? Since I use them quite aggressively, I picked at MIT's fleamarket a few dozens of them dirt-cheap. The tube looked suspensions. Then marked as Amperex, Made in England and National Elect...

Read the Post in new Window Read the Post in Threaded view  Post #302: Valvo mesh 0A2 by N-set on 2020-07-09 
Browse the content of the threads in new Window  Thread: The last phonocorrector: “End of Life" Phonostage in Analog Playback  310 Replies 
[quote user="N-set"] Other changes to come: - looking for Amperex 0A2 with mesh plates - will rewire MM input in silver with silver WBT RCA's - it now welcomes my top cart, Decca London Reference with silver AQ Leopard ph...

Read the Post in new Window Read the Post in Threaded view  Post #41: The external shields on the gas tubes. by Romy the Cat on 2009-09-24 
Browse the content of the threads in new Window  Thread: Gas voltage reference 0A2 tubes. in Melquiades Amplifier  42 Replies 
This post is a derivation from the following post: http://www.romythecat.com/Forums/ShowPost.aspx?postID=11797#11797 What is interesting is that I have a few the same types of shields for small 7 pin gas tubes and I have tried tho...

Read the Post in new Window Read the Post in Threaded view  Post #158: Gas tubes in the phonostage by Romy the Cat on 2011-11-22 
Browse the content of the threads in new Window  Thread: The last phonocorrector: “End of Life" Phonostage in Analog Playback  310 Replies 
[quote user="AlexBerger"]Hello Romy, What brand of 0A2 do you use in your phonostage?I used RCA, but after 1.5 years of work it began to spark when phonostage is switched on.I tried Siemens, Mazda and now Sylvania 0A2.Siemens has "disco sound"...

Read the Post in new Window Read the Post in Threaded view  Post #290: Capacitors & updates by N-set on 2020-03-15 
Browse the content of the threads in new Window  Thread: The last phonocorrector: “End of Life" Phonostage in Analog Playback  310 Replies 
I think industrial grade Arcotronics KP172 (from RS components ?), film and foil. I use them also as output coupling caps (2x0,47u) Other changes I've made, not commented in my posts here: ...
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