View Full Version : Tubes (Valves)

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  1. Are new production EL34's just this bad or is there a problem in my amp I don't see?
  2. So I need some help for a new prototype.....
  3. Probably a really simple bias question
  4. Is JAN Sylvania 6L6WGB under rated the same as JAN Philips 6L6WGB?
  5. Fender pro junior bad transformer and red plating v3 tube
  6. Idea: singleton power tube trading forum?
  7. Aaron C
  8. Data sheet confusion for 12BY7-A
  9. sound city 120 - I may have 'highlighted' a fault !!!
  10. high screen voltage
  11. Preamp tubes with different triodes
  12. Help me Identify these Tubes!
  13. 6F12P
  14. Suggestions for 30-40v power supply for micro tubes.
  15. Laney IronHeart
  16. Matching tubes at home Q?
  17. Guild thunder 1 help
  18. Dropping B+ substantially
  19. tube /valve Biasing
  20. 6CA7 Current Draw Increases
  21. Viking tube radio to guitar amp
  22. JJ 6v6s spare pins.
  23. high gain amp attenuating
  24. Will this output transformer work?
  25. Homemade Tube Tester
  26. Eico HF-20 50's 6L6 UL HIFI amp, convert for guitar or just try to sell it?
  27. 6v6 Grid Bias Circuit.
  28. Bias test points.
  29. Antique Sound Lab 6L6 Tube Up For Adoption
  30. Fender Twin Reverb 65 Reissue 6L6 Tube Replacement
  31. Any new EL84's lately with better reject rates?
  32. Tung-Sol 5881 - Hard, Medium, Soft?
  33. Can someone look over my biasing data to see if I've got it right.
  34. Help with tube data sheet, ecll800
  35. Help with tube data sheet, ecll800
  36. resistors as inrush limiters before full-wave diodes?
  37. Calibrating Tube Testers
  38. 6L6 Build Suggestions
  39. 5R4GY longevity in tube amps
  40. 5U4GB tube rectifier flash
  41. 6j6 & similar...
  42. Re-bonding tube bases
  43. replacing 6w8's with separate pre and output tubes
  44. Replacing 6L6 with 6V6?
  45. One of these things is not like the others...
  46. Russian made Groove Tubes?
  47. Awesome tube tester/curve tracer
  48. Tone stack Mod for Bogen H30
  49. help identifying this tube
  50. 6L6--- which brand best keeps the fenders sound
  51. More Bass/Less Mid mod for a Sovtek Mig 50h
  52. EL84 tubes
  53. Source for 9-pin (preamp) tube bases???
  54. Just used a 16 years old new tubes.
  55. Shuguang 6L6WGC - any info
  56. hardware for blackface fender fix
  57. Model t tubes
  58. Anybody looked at tube perveance values?
  59. Tube Storage
  60. When did the American Tung Sol factory cease production?
  61. New production 12AX7
  62. CE Distribution - policy change coming for defective tubes
  63. Sinorussotubeaphobia
  64. Triplett 3444 testing of a 12AX7
  65. Variations in Filament intensity
  66. Used power tubes
  67. New production Mullard El34's
  68. Origin of the 6L6GC?
  69. Sovtek 6CA7 fat bottle 90s era
  70. ID tubes from 1968 Traynor YVM-1
  71. Thoughts on Tung Sol reissue 12AX7 and reliability?
  72. Plate voltage of NOS RCA and NOS Tung Sol??
  73. Old Sovtek EL34G, similar tube?
  74. Current production Sovtek EL84M
  75. 12AX7 tube for overdriven analog organ
  76. ECC83 clipping
  77. Can KT88's be used in my amp?
  78. JJ 6L6GCs... WTF?
  79. Please suggest KT88 tubes
  80. wurlitzer branded general electric grey plate 12ax7
  81. Power Tube Swap Extravaganza!
  82. need a source for 6KG6A/ EL509 tubes
  83. how long do these last?
  84. What is this tube ID?
  85. Avo valve tester questions.
  86. winged C vs Svetlana el34s?
  87. Mercury Rectifier Tubes
  88. boutique/back yard tube maker in Japan [Youtube]
  89. cathode by-pass in push pull six tube hifi amp
  90. Nuvistors - what do you think?
  91. Bias question - 6L6
  92. Adhesive for Repairing 6V6GT Base?
  93. 5763 Tetrode - what do you think?
  94. NOS Metal Can 6V6 Tube Quesiton
  95. Franks Electron Tube Data Sheets site down?
  96. Tube amps
  97. rf/audio screen voltage ratings
  98. Help with value vintage Line Transformer Altec 2282
  99. Suggest preamp tube (12AX7)
  100. Anyone used Sovtek 12ax7wa - Had one crack
  101. ID this Tube?
  102. what power amp is this and who made it ????need schmatic
  103. Recommendations for EL34 for 520V on the plate
  104. Anyone else having issues with Winged C EL34's?
  105. JJ 5Y3?
  106. Retrovalves
  107. Question For Other NOS Tube Junkies
  108. mismatched 6v6 pairs; cathode bias
  109. Article - Return of the Vacuum Tube
  110. Tube-Based Boiler Controller / Thermostat?
  111. Any experience with this tube vendor?
  112. Blackface Deluxe Reverb No bias current reading
  113. Fender Bassman 10 Bias adjust conversion
  114. Proper Tube Removal Process?
  115. dead output transformer
  116. Shuguang data sheets
  117. Ordered JJ's for my Bugera 333XL
  118. The Tube Shop - anyone shopped there?
  119. Which 12AX7 for my 18 watt plexi build ?
  120. 12AH7A info
  121. Changing tubes in a Crate vc5310
  122. Winged C 6L6GC + TubeDepot
  123. WANTED: 2 6N6 "metal can" vacuum tubes
  124. 50Watt Vintage tube PA Tubes?
  125. Northern Electric Tubes
  126. Fooprints (symbols) for tubes for Orcad PCB designer
  127. Sovtek 12AX7s
  128. Octal tubes and microphonics?
  129. Tube amplifier for headphones
  130. Any Opinions on Octal Preamp Tubes?
  131. Cryo treatment of metal things with music coming out of them
  132. JJ EL84 failure
  133. Anybody Know About Ballast Tubes?
  134. 21.5 watts from a Pair of EL84's?
  135. Strange 5AR4 "Problem"
  136. Is cathode bias the same thing as "self" bias?
  137. Rectifier tube question
  138. Who made the Groove Tube KT-66HP?
  139. Bugera 333XL 212 Combo Tube Questions
  140. Senior TC130 tube tester chart
  141. Difference between 5AR$ and 5Y3 as Tweed Deluxe rectifier
  142. What to do with one of a pair of matched tubes
  143. Most reliable current production 5AR4/GZ34?
  144. Please recommend me tubes for my Bassman
  145. Peavey classic 30
  146. EF86 too weak. is it true what they say?
  147. JJ 6L6GC
  148. Will changing from a 5U4GB to ? lower my DC voltages?
  149. New 6Sl7
  150. Best New Issue EL34
  151. Upgrading Epiphone Valve Junior to a 7591 SE design?
  152. 6Y6s.....any good for audio?
  153. My Handsome Devil head
  154. 6AR6WA v. 6L6GC?
  155. EF86-type Sonic Differences.....
  156. New Issue 6L6
  157. 12AX7 HUM
  158. 6U8/ECF82 shielding question
  159. 7581a in Fender amps?
  160. 12AY7 as a DC-coupled cathode follower
  161. Vox AC 100 Mk2
  162. Tung-Sol 6L6STR fragile bottle top
  163. ECF80 or ECF82 for AF?
  164. SED Winged C Prices Way Up
  165. Tube Lineage?
  166. 12ax7LP substitute
  167. Chinese tubes
  168. KT66 Pin 1 variations - which one is accurate?
  169. Tung-Sol RI 6V6 - opinions/experience?
  170. Presently manufactured power tubes
  171. Very elementary question/Sovtek etc.
  172. 807s?
  173. Miniwatt, yes or no?
  174. RCA - customers advice wanted
  175. Chinese and Russian tubes
  176. SS Tube replacements...
  177. Telefunken in Fender amps?
  178. 7868-EH tubes any good? (New Electro Harmonix)
  179. What are the best 6550/KT88 tubes for 2011?
  180. Gold Lions (English)____Anyone familiar?
  181. Bench-testing vintage power tubes?
  182. 6v6 and 6v6GT
  183. cleaning old dirty tubes?
  184. Tube labeling: Paint? Etched?
  185. help plz: identifying old tubes
  186. Baldwin 12AX7 Made in USA AMY 31 13 29
  187. tube test just for 12Ax7?
  188. Sovtek 5Y3GT--good tube?
  189. Are you kidding me!? Really!?
  190. 6SQ7 vs. 6SF5
  191. Anybody have a legible TC-142 schematic?
  192. Woolly guitar sound
  193. 12AX7 Mullard/Philips/Amperex NOS
  194. New JJ 5U4GB whines on warm up.
  195. 7591 vs 6V6
  196. Help me identify some 12ax7 tubes, please?
  197. What does it take to break a tube pin?
  198. EZ81, 6CA4, EL84 Question.
  199. Russian 6P3S
  200. 7868 tube
  201. Screens Still weak in EH6V6?
  202. ken-rad 6l6g and 6v6gc from 1948?
  203. Groove Tubes Marshall distortion Confusion!! lol.
  204. New 12AY7 vs 5751, can't hear the difference...!
  205. B&K 707 Tube Tester - Problem with emmissions test
  206. 6550,6L6,12AX7 and distortion question
  207. Tube question
  208. Any reason I shouldn't...
  209. Teonex
  210. Eurotubes=Bad News
  211. Svetlana factory seconds
  212. Free tube datasheets
  213. RCA 6L6's ?
  214. "Soot" Inside EL84/6BQ5
  215. JCM800 Preamp Clone - Wierd Distortion (oscilloscope pic)
  216. "Shield" brand 6BQ5 Torched Screen Resistors
  217. Preamp tubes
  218. Jan Philips 6L6WGB
  219. Mesa Boogie tubes
  220. R.I.P. CV4004.....Any tube sob stories?
  221. 5Y3 EZ81?
  222. Tube Slag
  223. my NOS 5y3 is not working. bad tube?
  224. Old Hammond Tubes??
  225. Cabs suited for Vox AC50
  226. legacy vl100
  227. I need Help with this tube "8CW5/XL86
  228. Amp should be 100 watts but low on power, why?
  229. 6sl7/12sl7 experimentation ?s'
  230. Question about Tube Output Power
  231. I have some general Q's about tubes!
  232. Question about tube glow.
  233. Hiwatt hi-gain 50 head biasing review
  234. Do different make 12AX7 tubes sound different? and why?
  235. 12at7 labeled as 12ax7
  236. Good Sounding Tubes
  237. New Tubes and disaster
  238. ECC 807 Brimar
  239. In at the deep end....
  240. Hiwatt hi-gain 50 head
  241. 6Y6GT in a Champ ?
  242. Bias probe
  243. No Sound on Fender Twin Pro All tube
  244. hammond tubes question
  245. Crate blue voodoo 60 watt 2-12 combo problems need advise
  246. Ampeg V4, maximizing headroom, needing real answers...
  247. Yellow Jacket Power Tube Adapter
  248. Hammond 7247
  249. The difference a tube can make
  250. What to do