View Full Version : Tubes (Valves)

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  1. Sovtek EL84m tests poor in Orange valve tester??
  2. Is a halo the sign of a bad tube?
  3. Beam Pentode orientation in relation to mains transformer
  4. Help Id holland made tube ,looks like el84 not sure though
  5. Tube ID?
  6. Found this old schematic
  7. amperex tubes and mesa tri-axis
  8. Any love for the Mazda 6/30L2?
  9. Static Shield in isolation transformer
  10. Modifying Widow makers with an isolation transformer
  11. Uh Oh I think I blew it
  12. Vintage Tube Amp Modification
  13. TNT brand?
  14. Triode / Pentode Loadline Simulator
  15. Modern 5y3s
  16. 6V6 Screen Voltage in 5E1 Champ
  17. Mod'ing a tube circuit (from early 60's stereo turntable)
  18. Tube blog
  19. 6EU7 tube
  20. Telefunken Tubes?
  21. Which current production 12AX7 have short plates and spiral filaments?
  22. JJ 6CA7 a better option for 6L6 amps w/ excessive B+?
  23. 12AX7 What is Mu?
  24. Handy List of Links to New-Sensor Tube Data Sheets
  25. Cool old tubes for tone gurus
  26. 5G9 'clone' build question
  27. Blues Junior Buzzing
  28. JJ Tubes 12AX7/ECC83S Hum Problems Anyone?
  29. Off kilter 6v6.. any prob?
  30. Help identifying Hughes & Kettner CM3 Vacuum tube
  31. How tall are kt66 tubes in real life?
  32. Check this out
  33. Are new production EL34's just this bad or is there a problem in my amp I don't see?
  34. So I need some help for a new prototype.....
  35. Probably a really simple bias question
  36. Is JAN Sylvania 6L6WGB under rated the same as JAN Philips 6L6WGB?
  37. Fender pro junior bad transformer and red plating v3 tube
  38. Idea: singleton power tube trading forum?
  39. Aaron C
  40. Data sheet confusion for 12BY7-A
  41. sound city 120 - I may have 'highlighted' a fault !!!
  42. high screen voltage
  43. Preamp tubes with different triodes
  44. Help me Identify these Tubes!
  45. 6F12P
  46. Suggestions for 30-40v power supply for micro tubes.
  47. Laney IronHeart
  48. Matching tubes at home Q?
  49. Guild thunder 1 help
  50. Dropping B+ substantially
  51. tube /valve Biasing
  52. 6CA7 Current Draw Increases
  53. Viking tube radio to guitar amp
  54. JJ 6v6s spare pins.
  55. high gain amp attenuating
  56. Will this output transformer work?
  57. Homemade Tube Tester
  58. Eico HF-20 50's 6L6 UL HIFI amp, convert for guitar or just try to sell it?
  59. 6v6 Grid Bias Circuit.
  60. Bias test points.
  61. Antique Sound Lab 6L6 Tube Up For Adoption
  62. Fender Twin Reverb 65 Reissue 6L6 Tube Replacement
  63. Any new EL84's lately with better reject rates?
  64. Tung-Sol 5881 - Hard, Medium, Soft?
  65. Can someone look over my biasing data to see if I've got it right.
  66. Help with tube data sheet, ecll800
  67. Help with tube data sheet, ecll800
  68. resistors as inrush limiters before full-wave diodes?
  69. Calibrating Tube Testers
  70. 6L6 Build Suggestions
  71. 5R4GY longevity in tube amps
  72. 5U4GB tube rectifier flash
  73. 6j6 & similar...
  74. Re-bonding tube bases
  75. replacing 6w8's with separate pre and output tubes
  76. Replacing 6L6 with 6V6?
  77. One of these things is not like the others...
  78. Russian made Groove Tubes?
  79. Awesome tube tester/curve tracer
  80. Tone stack Mod for Bogen H30
  81. help identifying this tube
  82. 6L6--- which brand best keeps the fenders sound
  83. More Bass/Less Mid mod for a Sovtek Mig 50h
  84. EL84 tubes
  85. Source for 9-pin (preamp) tube bases???
  86. Just used a 16 years old new tubes.
  87. Shuguang 6L6WGC - any info
  88. hardware for blackface fender fix
  89. Model t tubes
  90. Anybody looked at tube perveance values?
  91. Tube Storage
  92. When did the American Tung Sol factory cease production?
  93. New production 12AX7
  94. CE Distribution - policy change coming for defective tubes
  95. Sinorussotubeaphobia
  96. Triplett 3444 testing of a 12AX7
  97. Variations in Filament intensity
  98. Used power tubes
  99. New production Mullard El34's
  100. Origin of the 6L6GC?
  101. Sovtek 6CA7 fat bottle 90s era
  102. ID tubes from 1968 Traynor YVM-1
  103. Thoughts on Tung Sol reissue 12AX7 and reliability?
  104. Plate voltage of NOS RCA and NOS Tung Sol??
  105. Old Sovtek EL34G, similar tube?
  106. Current production Sovtek EL84M
  107. 12AX7 tube for overdriven analog organ
  108. ECC83 clipping
  109. Can KT88's be used in my amp?
  110. JJ 6L6GCs... WTF?
  111. Please suggest KT88 tubes
  112. wurlitzer branded general electric grey plate 12ax7
  113. Power Tube Swap Extravaganza!
  114. need a source for 6KG6A/ EL509 tubes
  115. how long do these last?
  116. What is this tube ID?
  117. Avo valve tester questions.
  118. winged C vs Svetlana el34s?
  119. Mercury Rectifier Tubes
  120. boutique/back yard tube maker in Japan [Youtube]
  121. cathode by-pass in push pull six tube hifi amp
  122. Nuvistors - what do you think?
  123. Bias question - 6L6
  124. Adhesive for Repairing 6V6GT Base?
  125. 5763 Tetrode - what do you think?
  126. NOS Metal Can 6V6 Tube Quesiton
  127. Franks Electron Tube Data Sheets site down?
  128. Tube amps
  129. rf/audio screen voltage ratings
  130. Help with value vintage Line Transformer Altec 2282
  131. Suggest preamp tube (12AX7)
  132. Anyone used Sovtek 12ax7wa - Had one crack
  133. ID this Tube?
  134. what power amp is this and who made it ????need schmatic
  135. Recommendations for EL34 for 520V on the plate
  136. Anyone else having issues with Winged C EL34's?
  137. JJ 5Y3?
  138. Retrovalves
  139. Question For Other NOS Tube Junkies
  140. mismatched 6v6 pairs; cathode bias
  141. Article - Return of the Vacuum Tube
  142. Tube-Based Boiler Controller / Thermostat?
  143. Any experience with this tube vendor?
  144. Blackface Deluxe Reverb No bias current reading
  145. Fender Bassman 10 Bias adjust conversion
  146. Proper Tube Removal Process?
  147. dead output transformer
  148. Shuguang data sheets
  149. Ordered JJ's for my Bugera 333XL
  150. The Tube Shop - anyone shopped there?
  151. Which 12AX7 for my 18 watt plexi build ?
  152. 12AH7A info
  153. Changing tubes in a Crate vc5310
  154. Winged C 6L6GC + TubeDepot
  155. WANTED: 2 6N6 "metal can" vacuum tubes
  156. 50Watt Vintage tube PA Tubes?
  157. Northern Electric Tubes
  158. Fooprints (symbols) for tubes for Orcad PCB designer
  159. Sovtek 12AX7s
  160. Octal tubes and microphonics?
  161. Tube amplifier for headphones
  162. Any Opinions on Octal Preamp Tubes?
  163. Cryo treatment of metal things with music coming out of them
  164. JJ EL84 failure
  165. Anybody Know About Ballast Tubes?
  166. 21.5 watts from a Pair of EL84's?
  167. Strange 5AR4 "Problem"
  168. Is cathode bias the same thing as "self" bias?
  169. Rectifier tube question
  170. Who made the Groove Tube KT-66HP?
  171. Bugera 333XL 212 Combo Tube Questions
  172. Senior TC130 tube tester chart
  173. Difference between 5AR$ and 5Y3 as Tweed Deluxe rectifier
  174. What to do with one of a pair of matched tubes
  175. Most reliable current production 5AR4/GZ34?
  176. Please recommend me tubes for my Bassman
  177. Peavey classic 30
  178. EF86 too weak. is it true what they say?
  179. JJ 6L6GC
  180. Will changing from a 5U4GB to ? lower my DC voltages?
  181. New 6Sl7
  182. Best New Issue EL34
  183. Upgrading Epiphone Valve Junior to a 7591 SE design?
  184. 6Y6s.....any good for audio?
  185. My Handsome Devil head
  186. 6AR6WA v. 6L6GC?
  187. EF86-type Sonic Differences.....
  188. New Issue 6L6
  189. 12AX7 HUM
  190. 6U8/ECF82 shielding question
  191. 7581a in Fender amps?
  192. 12AY7 as a DC-coupled cathode follower
  193. Vox AC 100 Mk2
  194. Tung-Sol 6L6STR fragile bottle top
  195. ECF80 or ECF82 for AF?
  196. SED Winged C Prices Way Up
  197. Tube Lineage?
  198. 12ax7LP substitute
  199. Chinese tubes
  200. KT66 Pin 1 variations - which one is accurate?
  201. Tung-Sol RI 6V6 - opinions/experience?
  202. Presently manufactured power tubes
  203. Very elementary question/Sovtek etc.
  204. 807s?
  205. Miniwatt, yes or no?
  206. RCA - customers advice wanted
  207. Chinese and Russian tubes
  208. SS Tube replacements...
  209. Telefunken in Fender amps?
  210. 7868-EH tubes any good? (New Electro Harmonix)
  211. What are the best 6550/KT88 tubes for 2011?
  212. Gold Lions (English)____Anyone familiar?
  213. Bench-testing vintage power tubes?
  214. 6v6 and 6v6GT
  215. cleaning old dirty tubes?
  216. Tube labeling: Paint? Etched?
  217. help plz: identifying old tubes
  218. Baldwin 12AX7 Made in USA AMY 31 13 29
  219. tube test just for 12Ax7?
  220. Sovtek 5Y3GT--good tube?
  221. Are you kidding me!? Really!?
  222. 6SQ7 vs. 6SF5
  223. Anybody have a legible TC-142 schematic?
  224. Woolly guitar sound
  225. 12AX7 Mullard/Philips/Amperex NOS
  226. New JJ 5U4GB whines on warm up.
  227. 7591 vs 6V6
  228. Help me identify some 12ax7 tubes, please?
  229. What does it take to break a tube pin?
  230. EZ81, 6CA4, EL84 Question.
  231. Russian 6P3S
  232. 7868 tube
  233. Screens Still weak in EH6V6?
  234. ken-rad 6l6g and 6v6gc from 1948?
  235. Groove Tubes Marshall distortion Confusion!! lol.
  236. New 12AY7 vs 5751, can't hear the difference...!
  237. B&K 707 Tube Tester - Problem with emmissions test
  238. 6550,6L6,12AX7 and distortion question
  239. Tube question
  240. Any reason I shouldn't...
  241. Teonex
  242. Eurotubes=Bad News
  243. Svetlana factory seconds
  244. Free tube datasheets
  245. RCA 6L6's ?
  246. "Soot" Inside EL84/6BQ5
  247. JCM800 Preamp Clone - Wierd Distortion (oscilloscope pic)
  248. "Shield" brand 6BQ5 Torched Screen Resistors
  249. Preamp tubes
  250. Jan Philips 6L6WGB