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  1. Need to run heaters in output tubes, remove plate and screen safe?
  2. 1AG4 Direct Heated Pentode, Output
  3. grid stopper and grid choke on pentode input
  4. unusual noise on AB763 Super reverb clone
  5. Has anyone tryied the GuiGuang 300B?
  6. Honeywell Mercury Tube?
  7. Tube audio-phoolery -- more teats on bulls
  8. Strange tube
  9. Adding a Headphone output to my amp.
  10. 6CG7 Phono/ linestage
  11. RH84 Build from old Dumont console
  12. 6N16 12x preamp srpp/cathode follower with printed circuit board design.
  13. Long Tail Pair
  14. Hickok 752A 5AR4 rectifier test?
  15. Shunt Capacitance in Output Transformer
  16. LTP vs single first stage
  17. 6n23 v. 6dj8 v. 6fq7
  18. newer than noob looking for advice on RH84
  19. 300B failed again
  20. No output transformer tube amp
  21. curious about a curious connection
  22. tube crossover project - http://www.pmillett.com/tube_active_crossover.htm
  23. My new "vintage" tube radio
  24. help designing 6L6G S.E. amplifier
  25. SVT output iron as single ended
  26. is 6s2p actually equiv to 8532?
  27. Grundig H&B 6007 tube power supply - Repair or gut for parts?
  28. Quad 22 stereo balance/ filter problem
  29. KR 2A3: problems?
  30. Philco F-1801
  31. KT88 Stereo Schematic and help
  32. Where should I connect ground reference for heater supply?
  33. Chassis size and layout question
  34. May tubes amps
  35. 12SX7 coin base tubes? Fake?
  36. Toroidal transformer on tube amp
  37. Current Mirrors in a balanced preamp
  38. Half-mu stage (or SRPP) w/6DJ8/6922/ECC88 tubes at Low B+ voltage?
  39. High-end Tube amp kits (all-included)
  40. High Current Maida
  41. High Current Maida
  42. Balanced tube preamp schematic or kit?
  43. Trying to find tube component supplier, lost webite ...VT42.com or something like it.
  44. 2A3 PP Can my OPT do the job?
  45. 1626 / 6j4 tube amp
  46. suggestions for driver tube for 2A3
  47. Does anyone know the specs for this Chinese pentode
  48. SiliconRay Kits
  49. Advice needed for hum reduction
  50. low voltage dc tube phase splitter/12AU7
  51. Damper rectifier tubes & voltage doubler
  52. Overheating Resistors on DAC board- "HELP NEEDED"
  53. opt primary inductance and secondary load
  54. SOS-HELP-AIDE-HILFE on " DAC dilema"
  55. Transformer Mounting Direction
  56. HELP! new to working on tube amps and need help with project im going to take on
  57. Fisher 500c radio hum
  58. Modify Power supply for Tube Amp
  59. Unusual amps..
  60. Anyone make a guitar amp from an EA-3?
  61. Help with Preamp/Amp hum
  62. Question about step up in 300B PP amp
  63. How do we reach PMillet?
  64. Please help me with a few questions and a idea for an old PA
  65. nos 5y3wgt in 5e3
  66. Edcor CXSE25-8-2.5K single ended UL transformer
  67. Voltseconds ccs for the K-12 kit
  68. The Torpedo Parafeed Headphone Amplifier
  69. Tube Rectifiers do sound different
  70. 6922, a 6DJ8 replacement??
  71. QB2/250 amplifier
  72. WE 350B and 311A
  73. Single ended 300b's
  74. More power!
  75. How the magnetic affect the sound of tube amplifier
  76. Valves replacement for Copland CT402
  77. Changing valve damage
  78. Tube phono preamplifier by 12ax7
  79. Altec 353A oddity
  80. I need to lose that Hummmm
  81. Reduce B+ with zener
  82. Old Marshall plexi clone problem
  83. triode and pentode 6v6 in parallel
  84. How to make mic input transformer 150:50KCT for mic tube preamp???
  85. Webcor 12AU7 is it a Mullard?
  86. Everett AO48
  87. Resurrecting old tubes
  88. Lumley ST70 Output impedance change and other questions
  89. AC Heater reference to B+
  90. Two tube class a2 se trioded el84 with 12dw7 cathode follower driver?
  91. Overly complicated 1.6A CCS Heater Supply
  92. Hibryd amplifier with tube/valve ECC88 (PCC88) and chipamp LM1875
  93. Tube/Valve buffer with ECC88
  94. High(er) gm octal pentodes?
  95. Shielding Characteristics of Copper Clad PCB
  96. Starting a Meixing MC34-A07 modification project
  97. 6V SLA Dropping resistor for a 5VDC Filament Supply
  98. Wind (Thermionic?) noise, and other strange sounds
  99. Suggestions for an tube-amp with KT88
  100. SE-100 Golden Tube Audio - REPAIR
  101. Power amp vs preamp topology
  102. EL34 Characteristics for Ug2 400V
  103. old Heathkit amp
  104. Toroid OPT for 300B
  105. Help: Connecting two Fluke meters in series
  106. Preamp Volume Controls
  107. Output SE Transformer Question
  108. Vintage electrolytic capacitors
  109. Silver bearing grease for tube sockets
  110. Should I try adding a small Tube Preamp to a DTA-100?
  111. IS 6N6P A DIRECT REPLACEMENT FOR ECC88CC ?
  112. Dynaco stereo 70 look alike
  113. Vacuum Tube factory: For Sale!
  114. Does anybody know anything about this German console
  115. Heater dillema for multi chassis phono stage.
  116. Q: lifespan of JJ ECC99 tubes
  117. Cold solder joint?
  118. My Experience with a Jolida 202s (SoFar..)
  119. Input Impedance/Buffers
  120. Old capacitors..Comments..
  121. Shizuki capacitors?
  122. Spectrum Analyzer: What to get ? What to look for in a spectrum analyzer ?
  123. Amperex Orange Globe 12ax7 ,Brimar cv4004
  124. Question about transformer lamination stacking techniques
  125. line preamplifier with 6c10
  126. Homebrew Toroidal Output Transformer
  127. Line output tube
  128. MJK's SSSchadeode
  129. Any one know were to buy the fu-80 tube?
  130. Maida Regulator PCB
  131. Suggestions for 7k output transformers.
  132. Help: Fluke 87V Meter Calibration
  133. Searching for Primaluna Prologue Three schematic
  134. JCM Build - Hum and Crackle
  135. Silvertone radio to Guitar Amp conversion question.
  136. Pentode Regulation Question
  137. pentodes with CCS load?
  138. Are these tube PCBs any good ?
  139. china 6L6 SEdiy
  140. What are your opinions of the ST-70 and St-120
  141. Baffle Step Compensation Tube Circuit
  142. 6L6 to 7027 cathode resistor value
  143. PCB to mount snapmout electrolytic capacitors
  144. Dared MC-7P Upgrades
  145. adapter to go from 6L6 to 807
  146. Tube Rolling a Jolida 202a
  147. Cathodyne gain calculator link
  148. Dynakit ST-35?
  149. PSUD modeling old amp PS fails.
  150. Fisher 800 push-pull output stage not symmetrical. Why?
  151. Question of D3a driving 300B
  152. old console amp
  153. st35 vs millett DCPP vs tubelab simple SE
  154. New Tim Mellows OTL project
  155. Melted my mains transformer - Where to find replacement ?
  156. Strange.................
  157. Effect of high mains voltage?
  158. Kent SL 21 Tube head need help!!
  159. Hexfred or SIC rectifiers in choke supplies
  160. 'Strange' bass boost with impedance transformer
  161. Did my tubes go south ?
  162. Use of Tango NN-600-600 Transformers ?
  163. Anyone have an explanation for break(burn)in
  164. The Right Tube & TRannie
  165. 6SL7 / 6SN7 Phono
  166. Tube integrated amp in China.
  167. Power supply issues with Borbely style 12AU7/MOSFET hybrid
  168. heater elevation ground point
  169. Edison 12, can anyone help?
  170. Delay B+ using relay?
  171. New Schematic Linestage Tube Preamp using EF86 & 12AX7
  172. Phonostage (WAD clone) and 12B4A Preamp Build
  173. Interstage coupling feedback
  174. Just received a Yaqin MC-10T and have a couple of questions.
  175. Amplifier Troubleshooting
  176. Audio Preamplifier with PCC88
  177. Need Help With These TriodeDick Preamp Scematics
  178. I need help with my amp project
  179. Looking for unbalanced to balanced transformer
  180. Power Transformer Question
  181. My First Tube Amp Project S5 K-12G
  182. 6E2 vacuum tube compatibility
  183. Tube condenser microphone help!
  184. Audio transformer feedback loop
  185. yaqin vk amp without the loudness button uk version
  186. PP driver stage with local feedback
  187. Leader LAG-120B Audio Generator Manual Wanted
  188. Transformer brand question
  189. Single ended at 24Vcc 1+1W @ 8 ohm - three tubes
  190. EL41 PP power supply questions
  191. Reduce output on a ECC88CC class A pre-amp !
  192. SE OT impedance question
  193. DIY Tube amp book?
  194. 6P6P tubes?? will 6V6's work?
  195. RH84 amplifier build, but very weak distorted output
  196. Paralleling filament transformers
  197. 6ak5 triode mode disipation
  198. Equalize or Not Equilize when driving a tube amp ?
  199. How to retire from DIY and sell off all your workshop contents?
  200. New to tubes and diyaudio here, question about torrids and tube amps...
  201. PC Based Oscilliscope for Tube Curcuits
  202. Lamp in HV Centre Tap - why?
  203. EL156 PP
  204. 300B resistor
  205. Has anyone here bought from ussr-tubes.com ?
  206. Which cathode bypass capacitor?
  207. RIAA Schematic for-6SL7,7308 or?
  208. Chassis' for Tube Gear
  209. Convergent Audio Tech SL1 preamp
  210. Buy Them While You Can Not When You...
  211. Does anyone know of Thomas Martens?
  212. OTL for 40-80ohm speakers
  213. Morrison Dinosaur
  214. pcl86=14gw8 ??
  215. My little SE with GU50
  216. Source follower in a DC-coupled pp amp?
  217. Tube chassis for retail sale.
  218. Poor man's power supply
  219. High voltage driver for AB2 operation GU81m tubes
  220. 5AR4 rectified power supply question
  221. Direct Coupled Amp
  222. Is this EL84 kit from Germany worth fooling with?
  223. 6v6 PP Pentode mode
  224. 5 pin octal tube socket
  225. RCA Manual Typo?
  226. pete millet low mu preamp
  227. Capability to drive the 211 PP
  228. 6BG6G SE advice needed.
  229. Signal Generator: Which one to buy ? What to look for in a signal generator ?
  230. Power booster
  231. I've just build this steroe amplifier
  232. What amp to build? Push Pull, SE? thoughts?
  233. amp sounds bad- fatman itube 252
  234. 6C33 single ended class A2 (cathode network question)
  235. Sweet Peach EL34b Amp - Distortion?
  236. 6C33C socket types, where to buy?
  237. haedphone amp. using 6418< NEED HELP
  238. finished my 6au6/807 amplifier
  239. Thinking about building an S5 16LS 16W amp I've got some questions for the forum./
  240. Broskie "Unbalancer" - transformer specifications
  241. Tube chess.
  242. How Its Made - Vacuum Tubes
  243. Please help me understand power supply load
  244. 12AU7 - How absolute are maximum ratings?
  245. Tube rejuvination
  246. Article: Samsung brings back tubes in audio dock
  247. 1st build suggestions
  248. Parallel SE output
  249. Fixed Bias question
  250. vintage ua 610 schematic