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  1. Valves replacement for Copland CT402
  2. Changing valve damage
  3. Tube phono preamplifier by 12ax7
  4. Altec 353A oddity
  5. I need to lose that Hummmm
  6. Reduce B+ with zener
  7. Old Marshall plexi clone problem
  8. triode and pentode 6v6 in parallel
  9. How to make mic input transformer 150:50KCT for mic tube preamp???
  10. Webcor 12AU7 is it a Mullard?
  11. Everett AO48
  12. Resurrecting old tubes
  13. Lumley ST70 Output impedance change and other questions
  14. AC Heater reference to B+
  15. Two tube class a2 se trioded el84 with 12dw7 cathode follower driver?
  16. Overly complicated 1.6A CCS Heater Supply
  17. Hibryd amplifier with tube/valve ECC88 (PCC88) and chipamp LM1875
  18. Tube/Valve buffer with ECC88
  19. High(er) gm octal pentodes?
  20. Shielding Characteristics of Copper Clad PCB
  21. Starting a Meixing MC34-A07 modification project
  22. 6V SLA Dropping resistor for a 5VDC Filament Supply
  23. Wind (Thermionic?) noise, and other strange sounds
  24. Suggestions for an tube-amp with KT88
  25. SE-100 Golden Tube Audio - REPAIR
  26. Power amp vs preamp topology
  27. EL34 Characteristics for Ug2 400V
  28. old Heathkit amp
  29. Toroid OPT for 300B
  30. Help: Connecting two Fluke meters in series
  31. Preamp Volume Controls
  32. Output SE Transformer Question
  33. Vintage electrolytic capacitors
  34. Silver bearing grease for tube sockets
  35. Should I try adding a small Tube Preamp to a DTA-100?
  36. IS 6N6P A DIRECT REPLACEMENT FOR ECC88CC ?
  37. Dynaco stereo 70 look alike
  38. Vacuum Tube factory: For Sale!
  39. Does anybody know anything about this German console
  40. Heater dillema for multi chassis phono stage.
  41. Q: lifespan of JJ ECC99 tubes
  42. Cold solder joint?
  43. Input Impedance/Buffers
  44. Old capacitors..Comments..
  45. Shizuki capacitors?
  46. Spectrum Analyzer: What to get ? What to look for in a spectrum analyzer ?
  47. Amperex Orange Globe 12ax7 ,Brimar cv4004
  48. Question about transformer lamination stacking techniques
  49. line preamplifier with 6c10
  50. Homebrew Toroidal Output Transformer
  51. Line output tube
  52. MJK's SSSchadeode
  53. Any one know were to buy the fu-80 tube?
  54. Maida Regulator PCB
  55. Suggestions for 7k output transformers.
  56. Help: Fluke 87V Meter Calibration
  57. Searching for Primaluna Prologue Three schematic
  58. JCM Build - Hum and Crackle
  59. Silvertone radio to Guitar Amp conversion question.
  60. Pentode Regulation Question
  61. pentodes with CCS load?
  62. Are these tube PCBs any good ?
  63. china 6L6 SEdiy
  64. What are your opinions of the ST-70 and St-120
  65. Baffle Step Compensation Tube Circuit
  66. 6L6 to 7027 cathode resistor value
  67. PCB to mount snapmout electrolytic capacitors
  68. Dared MC-7P Upgrades
  69. adapter to go from 6L6 to 807
  70. My Experience with a Jolida 202s (SoFar..)
  71. Cathodyne gain calculator link
  72. Dynakit ST-35?
  73. PSUD modeling old amp PS fails.
  74. Fisher 800 push-pull output stage not symmetrical. Why?
  75. Question of D3a driving 300B
  76. old console amp
  77. st35 vs millett DCPP vs tubelab simple SE
  78. New Tim Mellows OTL project
  79. Melted my mains transformer - Where to find replacement ?
  80. Strange.................
  81. Effect of high mains voltage?
  82. Kent SL 21 Tube head need help!!
  83. Hexfred or SIC rectifiers in choke supplies
  84. 'Strange' bass boost with impedance transformer
  85. Did my tubes go south ?
  86. Use of Tango NN-600-600 Transformers ?
  87. Anyone have an explanation for break(burn)in
  88. The Right Tube & TRannie
  89. 6SL7 / 6SN7 Phono
  90. Tube integrated amp in China.
  91. Power supply issues with Borbely style 12AU7/MOSFET hybrid
  92. heater elevation ground point
  93. Edison 12, can anyone help?
  94. Delay B+ using relay?
  95. New Schematic Linestage Tube Preamp using EF86 & 12AX7
  96. Phonostage (WAD clone) and 12B4A Preamp Build
  97. Interstage coupling feedback
  98. Just received a Yaqin MC-10T and have a couple of questions.
  99. Amplifier Troubleshooting
  100. Audio Preamplifier with PCC88
  101. Need Help With These TriodeDick Preamp Scematics
  102. I need help with my amp project
  103. Looking for unbalanced to balanced transformer
  104. Power Transformer Question
  105. My First Tube Amp Project S5 K-12G
  106. 6E2 vacuum tube compatibility
  107. Tube condenser microphone help!
  108. Audio transformer feedback loop
  109. yaqin vk amp without the loudness button uk version
  110. PP driver stage with local feedback
  111. Leader LAG-120B Audio Generator Manual Wanted
  112. Transformer brand question
  113. Single ended at 24Vcc 1+1W @ 8 ohm - three tubes
  114. EL41 PP power supply questions
  115. Reduce output on a ECC88CC class A pre-amp !
  116. SE OT impedance question
  117. DIY Tube amp book?
  118. 6P6P tubes?? will 6V6's work?
  119. RH84 amplifier build, but very weak distorted output
  120. Paralleling filament transformers
  121. 6ak5 triode mode disipation
  122. Equalize or Not Equilize when driving a tube amp ?
  123. How to retire from DIY and sell off all your workshop contents?
  124. New to tubes and diyaudio here, question about torrids and tube amps...
  125. PC Based Oscilliscope for Tube Curcuits
  126. Lamp in HV Centre Tap - why?
  127. EL156 PP
  128. 300B resistor
  129. Has anyone here bought from ussr-tubes.com ?
  130. Which cathode bypass capacitor?
  131. RIAA Schematic for-6SL7,7308 or?
  132. Chassis' for Tube Gear
  133. Convergent Audio Tech SL1 preamp
  134. Buy Them While You Can Not When You...
  135. Does anyone know of Thomas Martens?
  136. OTL for 40-80ohm speakers
  137. Morrison Dinosaur
  138. pcl86=14gw8 ??
  139. My little SE with GU50
  140. Source follower in a DC-coupled pp amp?
  141. Tube chassis for retail sale.
  142. Poor man's power supply
  143. High voltage driver for AB2 operation GU81m tubes
  144. 5AR4 rectified power supply question
  145. Direct Coupled Amp
  146. Is this EL84 kit from Germany worth fooling with?
  147. 6v6 PP Pentode mode
  148. 5 pin octal tube socket
  149. RCA Manual Typo?
  150. pete millet low mu preamp
  151. Capability to drive the 211 PP
  152. 6BG6G SE advice needed.
  153. Signal Generator: Which one to buy ? What to look for in a signal generator ?
  154. Power booster
  155. I've just build this steroe amplifier
  156. What amp to build? Push Pull, SE? thoughts?
  157. amp sounds bad- fatman itube 252
  158. 6C33 single ended class A2 (cathode network question)
  159. Sweet Peach EL34b Amp - Distortion?
  160. 6C33C socket types, where to buy?
  161. haedphone amp. using 6418< NEED HELP
  162. finished my 6au6/807 amplifier
  163. Thinking about building an S5 16LS 16W amp I've got some questions for the forum./
  164. Broskie "Unbalancer" - transformer specifications
  165. Tube chess.
  166. How Its Made - Vacuum Tubes
  167. Please help me understand power supply load
  168. 12AU7 - How absolute are maximum ratings?
  169. Tube rejuvination
  170. Article: Samsung brings back tubes in audio dock
  171. 1st build suggestions
  172. Parallel SE output
  173. Fixed Bias question
  174. vintage ua 610 schematic
  175. Which KT88 PP and which Transformers?
  176. Some more special small-signal tv tubes
  177. MR 67 Coupling Caps
  178. Help - YAQIN MS-20L schematic
  179. Power and Speaker cables
  180. v1 tube keeps going microphonic help! 5e3 build
  181. Leak TL12+ with triode mode EF86
  182. diy tube dampers
  183. VTVM troubleshooting help
  184. PP amp crossover distortion
  185. Sanity check please? ST-70(-ish) power supply
  186. Thoughts of apparent noise on ground - due to power tx?
  187. hybride circlotron
  188. Clone
  189. 8156 Beam Pentode Compactron
  190. DOUBLE TRIODE (6N16B)
  191. looking for Tube I/V analog for dac schematic ?
  192. NewBee PPEL84
  193. Whooaa! Now we're talking.
  194. Cinema Engineering AT-18
  195. Back from school
  196. Amp ideas for my spare 3.3k output transformers.
  197. HEllo and a few suggestions please
  198. 1SH24B Pre-Amp (or buffer?)
  199. Anode cap for GU 29 / QQE06/40
  200. Back to back autotransformers for B+?
  201. Sound Valves M60 schematics
  202. Volume Pot for RH84
  203. Mengyue mini el34b
  204. Which Chinese integrated tube amp have the power for Rock Song ?
  205. Help on transformers please
  206. 300B alternatives
  207. Anybody using a tube amp in their car?
  208. What is a KT88-98?
  209. 6au6 line stage a bad idea?
  210. Making a Kron tube
  211. AY Symphonies preamp
  212. Need to Upgrade Tube Preamp Volume Pot
  213. Tubelab Simple SE low B+
  214. Filament AC or DC?
  215. rasping sound from Dared VP-16
  216. Anyone have any "small signal" pentode models?
  217. Power amp distortion for modern amps
  218. Help with EL504-based amplifier
  219. Tubes: Are they worth it?
  220. Radio Shack Boston Monobloc (fuse question)
  221. 829B 3E29 Pentode PPP?
  222. Fixed Autobias?
  223. Best wishes
  224. Radiotron A504 amplifier schematic
  225. Blown power tube - a short story
  226. Hickok 752A calibration?
  227. replace EL34 with EL37 !?
  228. Mono push-pull driver PCB
  229. Magnavox 139AA schematics, info?
  230. Anyone knows what driver tube on DowdyLama's GM-70......
  231. Building an amp around the QB5/1750 transmitter tube
  232. Instrument amp from '59 Lowrey donor chassis.
  233. cascoded gyrator loaded 6H9C to low idle.
  234. vacuum tube DAC and connection
  235. Dynaco ST70 II Right Channel Out
  236. ST70 Inrush Issue
  237. ECC88 OTL heaphone amp
  238. Help with deciding to build or buy Tube amp.
  239. Luxman LV-105 static on on channel
  240. equivlent of FU-50
  241. placing the volume control
  242. PP 300B ''transformer coupled''
  243. My First Tube Preamp
  244. Tube amp kit and speaker recommendations?
  245. First design GU81M SE triode
  246. Instruments & Amps forum - where is it?
  247. Power supply capacitor question for tubelab simple ss
  248. EL300 = 6FN5 / PL300 = 35FN5 tube
  249. 6U8 driving 45
  250. very low impedance white follower with 6H13C

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