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  1. Data sheet confusion for 12BY7-A
  2. sound city 120 - I may have 'highlighted' a fault !!!
  3. high screen voltage
  4. Preamp tubes with different triodes
  5. Help me Identify these Tubes!
  6. 6F12P
  7. Suggestions for 30-40v power supply for micro tubes.
  8. Laney IronHeart
  9. Matching tubes at home Q?
  10. Guild thunder 1 help
  11. Dropping B+ substantially
  12. tube /valve Biasing
  13. 6CA7 Current Draw Increases
  14. Viking tube radio to guitar amp
  15. JJ 6v6s spare pins.
  16. high gain amp attenuating
  17. Will this output transformer work?
  18. Homemade Tube Tester
  19. Eico HF-20 50's 6L6 UL HIFI amp, convert for guitar or just try to sell it?
  20. 6v6 Grid Bias Circuit.
  21. Bias test points.
  22. Antique Sound Lab 6L6 Tube Up For Adoption
  23. Fender Twin Reverb 65 Reissue 6L6 Tube Replacement
  24. Any new EL84's lately with better reject rates?
  25. Tung-Sol 5881 - Hard, Medium, Soft?
  26. Can someone look over my biasing data to see if I've got it right.
  27. Help with tube data sheet, ecll800
  28. Help with tube data sheet, ecll800
  29. resistors as inrush limiters before full-wave diodes?
  30. Calibrating Tube Testers
  31. 6L6 Build Suggestions
  32. 5R4GY longevity in tube amps
  33. 5U4GB tube rectifier flash
  34. 6j6 & similar...
  35. Re-bonding tube bases
  36. replacing 6w8's with separate pre and output tubes
  37. Replacing 6L6 with 6V6?
  38. One of these things is not like the others...
  39. Russian made Groove Tubes?
  40. Awesome tube tester/curve tracer
  41. Tone stack Mod for Bogen H30
  42. help identifying this tube
  43. 6L6--- which brand best keeps the fenders sound
  44. More Bass/Less Mid mod for a Sovtek Mig 50h
  45. EL84 tubes
  46. Source for 9-pin (preamp) tube bases???
  47. Just used a 16 years old new tubes.
  48. Shuguang 6L6WGC - any info
  49. hardware for blackface fender fix
  50. Model t tubes
  51. Anybody looked at tube perveance values?
  52. Tube Storage
  53. When did the American Tung Sol factory cease production?
  54. New production 12AX7
  55. CE Distribution - policy change coming for defective tubes
  56. Sinorussotubeaphobia
  57. Triplett 3444 testing of a 12AX7
  58. Variations in Filament intensity
  59. Used power tubes
  60. New production Mullard El34's
  61. Origin of the 6L6GC?
  62. Sovtek 6CA7 fat bottle 90s era
  63. ID tubes from 1968 Traynor YVM-1
  64. Thoughts on Tung Sol reissue 12AX7 and reliability?
  65. Plate voltage of NOS RCA and NOS Tung Sol??
  66. Old Sovtek EL34G, similar tube?
  67. Current production Sovtek EL84M
  68. 12AX7 tube for overdriven analog organ
  69. ECC83 clipping
  70. Can KT88's be used in my amp?
  71. JJ 6L6GCs... WTF?
  72. Please suggest KT88 tubes
  73. wurlitzer branded general electric grey plate 12ax7
  74. Power Tube Swap Extravaganza!
  75. need a source for 6KG6A/ EL509 tubes
  76. how long do these last?
  77. What is this tube ID?
  78. Avo valve tester questions.
  79. winged C vs Svetlana el34s?
  80. Mercury Rectifier Tubes
  81. boutique/back yard tube maker in Japan [Youtube]
  82. cathode by-pass in push pull six tube hifi amp
  83. Nuvistors - what do you think?
  84. Bias question - 6L6
  85. Adhesive for Repairing 6V6GT Base?
  86. 5763 Tetrode - what do you think?
  87. NOS Metal Can 6V6 Tube Quesiton
  88. Franks Electron Tube Data Sheets site down?
  89. Tube amps
  90. rf/audio screen voltage ratings
  91. Help with value vintage Line Transformer Altec 2282
  92. Suggest preamp tube (12AX7)
  93. Anyone used Sovtek 12ax7wa - Had one crack
  94. ID this Tube?
  95. what power amp is this and who made it ????need schmatic
  96. Recommendations for EL34 for 520V on the plate
  97. Anyone else having issues with Winged C EL34's?
  98. JJ 5Y3?
  99. Retrovalves
  100. Question For Other NOS Tube Junkies
  101. mismatched 6v6 pairs; cathode bias
  102. Article - Return of the Vacuum Tube
  103. Tube-Based Boiler Controller / Thermostat?
  104. Any experience with this tube vendor?
  105. Blackface Deluxe Reverb No bias current reading
  106. Fender Bassman 10 Bias adjust conversion
  107. Proper Tube Removal Process?
  108. dead output transformer
  109. Shuguang data sheets
  110. Ordered JJ's for my Bugera 333XL
  111. The Tube Shop - anyone shopped there?
  112. Which 12AX7 for my 18 watt plexi build ?
  113. 12AH7A info
  114. Changing tubes in a Crate vc5310
  115. Winged C 6L6GC + TubeDepot
  116. WANTED: 2 6N6 "metal can" vacuum tubes
  117. 50Watt Vintage tube PA Tubes?
  118. Northern Electric Tubes
  119. Fooprints (symbols) for tubes for Orcad PCB designer
  120. Sovtek 12AX7s
  121. Octal tubes and microphonics?
  122. Tube amplifier for headphones
  123. Any Opinions on Octal Preamp Tubes?
  124. Cryo treatment of metal things with music coming out of them
  125. JJ EL84 failure
  126. Anybody Know About Ballast Tubes?
  127. 21.5 watts from a Pair of EL84's?
  128. Strange 5AR4 "Problem"
  129. Is cathode bias the same thing as "self" bias?
  130. Rectifier tube question
  131. Who made the Groove Tube KT-66HP?
  132. Bugera 333XL 212 Combo Tube Questions
  133. Senior TC130 tube tester chart
  134. Difference between 5AR$ and 5Y3 as Tweed Deluxe rectifier
  135. What to do with one of a pair of matched tubes
  136. Most reliable current production 5AR4/GZ34?
  137. Please recommend me tubes for my Bassman
  138. Peavey classic 30
  139. EF86 too weak. is it true what they say?
  140. JJ 6L6GC
  141. Will changing from a 5U4GB to ? lower my DC voltages?
  142. New 6Sl7
  143. Best New Issue EL34
  144. Upgrading Epiphone Valve Junior to a 7591 SE design?
  145. 6Y6s.....any good for audio?
  146. My Handsome Devil head
  147. 6AR6WA v. 6L6GC?
  148. EF86-type Sonic Differences.....
  149. New Issue 6L6
  150. 12AX7 HUM
  151. 6U8/ECF82 shielding question
  152. 7581a in Fender amps?
  153. 12AY7 as a DC-coupled cathode follower
  154. Vox AC 100 Mk2
  155. Tung-Sol 6L6STR fragile bottle top
  156. ECF80 or ECF82 for AF?
  157. SED Winged C Prices Way Up
  158. Tube Lineage?
  159. 12ax7LP substitute
  160. Chinese tubes
  161. KT66 Pin 1 variations - which one is accurate?
  162. Tung-Sol RI 6V6 - opinions/experience?
  163. Presently manufactured power tubes
  164. Very elementary question/Sovtek etc.
  165. 807s?
  166. Miniwatt, yes or no?
  167. RCA - customers advice wanted
  168. Chinese and Russian tubes
  169. SS Tube replacements...
  170. Telefunken in Fender amps?
  171. 7868-EH tubes any good? (New Electro Harmonix)
  172. What are the best 6550/KT88 tubes for 2011?
  173. Gold Lions (English)____Anyone familiar?
  174. Bench-testing vintage power tubes?
  175. 6v6 and 6v6GT
  176. cleaning old dirty tubes?
  177. Tube labeling: Paint? Etched?
  178. help plz: identifying old tubes
  179. Baldwin 12AX7 Made in USA AMY 31 13 29
  180. tube test just for 12Ax7?
  181. Sovtek 5Y3GT--good tube?
  182. Are you kidding me!? Really!?
  183. 6SQ7 vs. 6SF5
  184. Anybody have a legible TC-142 schematic?
  185. Woolly guitar sound
  186. 12AX7 Mullard/Philips/Amperex NOS
  187. New JJ 5U4GB whines on warm up.
  188. 7591 vs 6V6
  189. Help me identify some 12ax7 tubes, please?
  190. What does it take to break a tube pin?
  191. EZ81, 6CA4, EL84 Question.
  192. Russian 6P3S
  193. 7868 tube
  194. Screens Still weak in EH6V6?
  195. ken-rad 6l6g and 6v6gc from 1948?
  196. Groove Tubes Marshall distortion Confusion!! lol.
  197. New 12AY7 vs 5751, can't hear the difference...!
  198. B&K 707 Tube Tester - Problem with emmissions test
  199. 6550,6L6,12AX7 and distortion question
  200. Tube question
  201. Any reason I shouldn't...
  202. Teonex
  203. Eurotubes=Bad News
  204. Svetlana factory seconds
  205. Free tube datasheets
  206. RCA 6L6's ?
  207. "Soot" Inside EL84/6BQ5
  208. JCM800 Preamp Clone - Wierd Distortion (oscilloscope pic)
  209. "Shield" brand 6BQ5 Torched Screen Resistors
  210. Preamp tubes
  211. Jan Philips 6L6WGB
  212. Mesa Boogie tubes
  213. R.I.P. CV4004.....Any tube sob stories?
  214. 5Y3 EZ81?
  215. Tube Slag
  216. my NOS 5y3 is not working. bad tube?
  217. Old Hammond Tubes??
  218. Cabs suited for Vox AC50
  219. legacy vl100
  220. I need Help with this tube "8CW5/XL86
  221. Amp should be 100 watts but low on power, why?
  222. 6sl7/12sl7 experimentation ?s'
  223. Question about Tube Output Power
  224. I have some general Q's about tubes!
  225. Question about tube glow.
  226. Hiwatt hi-gain 50 head biasing review
  227. Do different make 12AX7 tubes sound different? and why?
  228. 12at7 labeled as 12ax7
  229. Good Sounding Tubes
  230. New Tubes and disaster
  231. ECC 807 Brimar
  232. In at the deep end....
  233. Hiwatt hi-gain 50 head
  234. 6Y6GT in a Champ ?
  235. Bias probe
  236. No Sound on Fender Twin Pro All tube
  237. hammond tubes question
  238. Crate blue voodoo 60 watt 2-12 combo problems need advise
  239. Ampeg V4, maximizing headroom, needing real answers...
  240. Yellow Jacket Power Tube Adapter
  241. Hammond 7247
  242. The difference a tube can make
  243. What to do
  244. Laney AOR
  245. Tube Tests and Specs
  246. Duende Criatura?
  247. A Good New 12AY7?
  248. Fender Twin Preamp Question.
  249. Ampeg VL-503 not working tube arent glowing
  250. Ampeg SVT pro 3