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  1. Help with Preamp/Amp hum
  2. Question about step up in 300B PP amp
  3. How do we reach PMillet?
  4. Please help me with a few questions and a idea for an old PA
  5. nos 5y3wgt in 5e3
  6. Edcor CXSE25-8-2.5K single ended UL transformer
  7. Voltseconds ccs for the K-12 kit
  8. The Torpedo Parafeed Headphone Amplifier
  9. Tube Rectifiers do sound different
  10. 6922, a 6DJ8 replacement??
  11. QB2/250 amplifier
  12. WE 350B and 311A
  13. Single ended 300b's
  14. More power!
  15. How the magnetic affect the sound of tube amplifier
  16. Valves replacement for Copland CT402
  17. Changing valve damage
  18. Tube phono preamplifier by 12ax7
  19. Altec 353A oddity
  20. I need to lose that Hummmm
  21. Reduce B+ with zener
  22. Old Marshall plexi clone problem
  23. triode and pentode 6v6 in parallel
  24. How to make mic input transformer 150:50KCT for mic tube preamp???
  25. Webcor 12AU7 is it a Mullard?
  26. Everett AO48
  27. Resurrecting old tubes
  28. Lumley ST70 Output impedance change and other questions
  29. AC Heater reference to B+
  30. Two tube class a2 se trioded el84 with 12dw7 cathode follower driver?
  31. Overly complicated 1.6A CCS Heater Supply
  32. Hibryd amplifier with tube/valve ECC88 (PCC88) and chipamp LM1875
  33. Tube/Valve buffer with ECC88
  34. High(er) gm octal pentodes?
  35. Shielding Characteristics of Copper Clad PCB
  36. Starting a Meixing MC34-A07 modification project
  37. 6V SLA Dropping resistor for a 5VDC Filament Supply
  38. Wind (Thermionic?) noise, and other strange sounds
  39. Suggestions for an tube-amp with KT88
  40. SE-100 Golden Tube Audio - REPAIR
  41. Power amp vs preamp topology
  42. EL34 Characteristics for Ug2 400V
  43. old Heathkit amp
  44. Toroid OPT for 300B
  45. Help: Connecting two Fluke meters in series
  46. Preamp Volume Controls
  47. Output SE Transformer Question
  48. Vintage electrolytic capacitors
  49. Silver bearing grease for tube sockets
  50. Should I try adding a small Tube Preamp to a DTA-100?
  51. IS 6N6P A DIRECT REPLACEMENT FOR ECC88CC ?
  52. Dynaco stereo 70 look alike
  53. Vacuum Tube factory: For Sale!
  54. Does anybody know anything about this German console
  55. Heater dillema for multi chassis phono stage.
  56. Q: lifespan of JJ ECC99 tubes
  57. Cold solder joint?
  58. Input Impedance/Buffers
  59. Old capacitors..Comments..
  60. Shizuki capacitors?
  61. Spectrum Analyzer: What to get ? What to look for in a spectrum analyzer ?
  62. Amperex Orange Globe 12ax7 ,Brimar cv4004
  63. Question about transformer lamination stacking techniques
  64. line preamplifier with 6c10
  65. Homebrew Toroidal Output Transformer
  66. Line output tube
  67. MJK's SSSchadeode
  68. Any one know were to buy the fu-80 tube?
  69. Maida Regulator PCB
  70. Suggestions for 7k output transformers.
  71. Help: Fluke 87V Meter Calibration
  72. Searching for Primaluna Prologue Three schematic
  73. JCM Build - Hum and Crackle
  74. Silvertone radio to Guitar Amp conversion question.
  75. Pentode Regulation Question
  76. pentodes with CCS load?
  77. Are these tube PCBs any good ?
  78. china 6L6 SEdiy
  79. What are your opinions of the ST-70 and St-120
  80. Baffle Step Compensation Tube Circuit
  81. 6L6 to 7027 cathode resistor value
  82. PCB to mount snapmout electrolytic capacitors
  83. Dared MC-7P Upgrades
  84. adapter to go from 6L6 to 807
  85. My Experience with a Jolida 202s (SoFar..)
  86. Cathodyne gain calculator link
  87. Dynakit ST-35?
  88. PSUD modeling old amp PS fails.
  89. Fisher 800 push-pull output stage not symmetrical. Why?
  90. Question of D3a driving 300B
  91. old console amp
  92. st35 vs millett DCPP vs tubelab simple SE
  93. New Tim Mellows OTL project
  94. Melted my mains transformer - Where to find replacement ?
  95. Strange.................
  96. Effect of high mains voltage?
  97. Kent SL 21 Tube head need help!!
  98. Hexfred or SIC rectifiers in choke supplies
  99. 'Strange' bass boost with impedance transformer
  100. Did my tubes go south ?
  101. Use of Tango NN-600-600 Transformers ?
  102. Anyone have an explanation for break(burn)in
  103. The Right Tube & TRannie
  104. 6SL7 / 6SN7 Phono
  105. Tube integrated amp in China.
  106. Power supply issues with Borbely style 12AU7/MOSFET hybrid
  107. heater elevation ground point
  108. Edison 12, can anyone help?
  109. Delay B+ using relay?
  110. New Schematic Linestage Tube Preamp using EF86 & 12AX7
  111. Phonostage (WAD clone) and 12B4A Preamp Build
  112. Interstage coupling feedback
  113. Just received a Yaqin MC-10T and have a couple of questions.
  114. Amplifier Troubleshooting
  115. Audio Preamplifier with PCC88
  116. Need Help With These TriodeDick Preamp Scematics
  117. I need help with my amp project
  118. Looking for unbalanced to balanced transformer
  119. Power Transformer Question
  120. My First Tube Amp Project S5 K-12G
  121. 6E2 vacuum tube compatibility
  122. Tube condenser microphone help!
  123. Audio transformer feedback loop
  124. yaqin vk amp without the loudness button uk version
  125. PP driver stage with local feedback
  126. Leader LAG-120B Audio Generator Manual Wanted
  127. Transformer brand question
  128. Single ended at 24Vcc 1+1W @ 8 ohm - three tubes
  129. EL41 PP power supply questions
  130. Reduce output on a ECC88CC class A pre-amp !
  131. SE OT impedance question
  132. DIY Tube amp book?
  133. 6P6P tubes?? will 6V6's work?
  134. RH84 amplifier build, but very weak distorted output
  135. Paralleling filament transformers
  136. 6ak5 triode mode disipation
  137. Equalize or Not Equilize when driving a tube amp ?
  138. How to retire from DIY and sell off all your workshop contents?
  139. New to tubes and diyaudio here, question about torrids and tube amps...
  140. PC Based Oscilliscope for Tube Curcuits
  141. Lamp in HV Centre Tap - why?
  142. EL156 PP
  143. 300B resistor
  144. Has anyone here bought from ussr-tubes.com ?
  145. Which cathode bypass capacitor?
  146. RIAA Schematic for-6SL7,7308 or?
  147. Chassis' for Tube Gear
  148. Convergent Audio Tech SL1 preamp
  149. Buy Them While You Can Not When You...
  150. Does anyone know of Thomas Martens?
  151. OTL for 40-80ohm speakers
  152. Morrison Dinosaur
  153. pcl86=14gw8 ??
  154. My little SE with GU50
  155. Source follower in a DC-coupled pp amp?
  156. Tube chassis for retail sale.
  157. Poor man's power supply
  158. High voltage driver for AB2 operation GU81m tubes
  159. 5AR4 rectified power supply question
  160. Direct Coupled Amp
  161. Is this EL84 kit from Germany worth fooling with?
  162. 6v6 PP Pentode mode
  163. 5 pin octal tube socket
  164. RCA Manual Typo?
  165. pete millet low mu preamp
  166. Capability to drive the 211 PP
  167. 6BG6G SE advice needed.
  168. Signal Generator: Which one to buy ? What to look for in a signal generator ?
  169. Power booster
  170. I've just build this steroe amplifier
  171. What amp to build? Push Pull, SE? thoughts?
  172. amp sounds bad- fatman itube 252
  173. 6C33 single ended class A2 (cathode network question)
  174. Sweet Peach EL34b Amp - Distortion?
  175. 6C33C socket types, where to buy?
  176. haedphone amp. using 6418< NEED HELP
  177. finished my 6au6/807 amplifier
  178. Thinking about building an S5 16LS 16W amp I've got some questions for the forum./
  179. Broskie "Unbalancer" - transformer specifications
  180. Tube chess.
  181. How Its Made - Vacuum Tubes
  182. Please help me understand power supply load
  183. 12AU7 - How absolute are maximum ratings?
  184. Tube rejuvination
  185. Article: Samsung brings back tubes in audio dock
  186. 1st build suggestions
  187. Parallel SE output
  188. Fixed Bias question
  189. vintage ua 610 schematic
  190. Which KT88 PP and which Transformers?
  191. Some more special small-signal tv tubes
  192. MR 67 Coupling Caps
  193. Help - YAQIN MS-20L schematic
  194. Power and Speaker cables
  195. v1 tube keeps going microphonic help! 5e3 build
  196. Leak TL12+ with triode mode EF86
  197. diy tube dampers
  198. VTVM troubleshooting help
  199. PP amp crossover distortion
  200. Sanity check please? ST-70(-ish) power supply
  201. Thoughts of apparent noise on ground - due to power tx?
  202. hybride circlotron
  203. Clone
  204. 8156 Beam Pentode Compactron
  205. DOUBLE TRIODE (6N16B)
  206. looking for Tube I/V analog for dac schematic ?
  207. NewBee PPEL84
  208. Whooaa! Now we're talking.
  209. Cinema Engineering AT-18
  210. Back from school
  211. Amp ideas for my spare 3.3k output transformers.
  212. HEllo and a few suggestions please
  213. 1SH24B Pre-Amp (or buffer?)
  214. Anode cap for GU 29 / QQE06/40
  215. Back to back autotransformers for B+?
  216. Sound Valves M60 schematics
  217. Volume Pot for RH84
  218. Mengyue mini el34b
  219. Which Chinese integrated tube amp have the power for Rock Song ?
  220. Help on transformers please
  221. 300B alternatives
  222. Anybody using a tube amp in their car?
  223. What is a KT88-98?
  224. 6au6 line stage a bad idea?
  225. Making a Kron tube
  226. AY Symphonies preamp
  227. Need to Upgrade Tube Preamp Volume Pot
  228. Tubelab Simple SE low B+
  229. Filament AC or DC?
  230. rasping sound from Dared VP-16
  231. Anyone have any "small signal" pentode models?
  232. Power amp distortion for modern amps
  233. Help with EL504-based amplifier
  234. Tubes: Are they worth it?
  235. Radio Shack Boston Monobloc (fuse question)
  236. 829B 3E29 Pentode PPP?
  237. Fixed Autobias?
  238. Best wishes
  239. Radiotron A504 amplifier schematic
  240. Blown power tube - a short story
  241. Hickok 752A calibration?
  242. replace EL34 with EL37 !?
  243. Mono push-pull driver PCB
  244. Magnavox 139AA schematics, info?
  245. Anyone knows what driver tube on DowdyLama's GM-70......
  246. Building an amp around the QB5/1750 transmitter tube
  247. Instrument amp from '59 Lowrey donor chassis.
  248. cascoded gyrator loaded 6H9C to low idle.
  249. vacuum tube DAC and connection
  250. Dynaco ST70 II Right Channel Out

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