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  1. RH 84 Variation: Direct Coupled Pentode
  2. Single Transformer, two valve rectifiers
  3. Capacitors for Radio Frequency Amlifier and Converter Oscillator Tubes
  4. Tube Screening Cans
  5. PSU grounding
  6. 6AX4GT TV damper
  7. plate on chinese 6L6 red on one side
  8. FM stereo decoder
  9. Under the Christmas Tree - Valve Amplifiers 4th Ed.
  10. Using those dern 1625 tubes: a simple SEP amplifier
  11. Pairs of resistors in opposite directions
  12. 45 spice model
  13. APEX 460 Tube mic modification
  14. EL84 and 6BQ5 are Same?
  15. Simple hybrid amplifier (35W/8Ohm)
  16. Yaqin mc 10l or qinpu 6000 mkii
  17. Reported attack site?
  18. LCR RIAA Phono with DHTs
  19. New Here -Would Like to Build
  20. 12E1 push pull poweramp
  21. marantz model 9
  22. I would appreciate some helpfull advice from Aikido builders
  23. Dynaco ST70 big Snorting noise.
  24. Good Soft Distortion
  25. magnavox 8301 revamp, need's a second look
  26. Circuit or schematic for current source of 7.5mA
  27. Sakuma's bleeder tubes and series connected transfomers
  28. Tube measurement
  29. adding tone control to SE 6v6 amp
  30. Easy Little 6L6 SE
  31. knight KA-55
  32. Hum in tube amp
  33. Lundahl LL1660 10 mA Alt V
  34. 12au7 valve preamp (again?)
  35. Simple DC heating question
  36. 6146B?
  37. Reduce gain on power amp?
  38. ES9023 DAC(subbu) + Tube Preamp with Remote and R2R volume control(Danzup)
  39. AC heaters question
  40. Anyone tried this Mcintosh c22 knock off.
  41. Help me to find pins for tube socket
  42. HT delay pcb...
  43. Power supply, heater questions...
  44. Heathkit AA-151, to separate pre-amp advise needed?
  45. grounding
  46. 2 Stage GM-70 amp in A2... possible?
  47. GlassWare Janus Shunt Rectifier Tube Swap
  48. Schematics
  49. SE 6B4G driver tube options?
  50. seeking datasheet of 6J2B-V in english
  51. Nailing Hum in my Phono Stage
  52. Shaving voltage off HV supply?
  53. LEAK T12 and POINT ONE - worth having ?
  54. Quicksilvers Mid Mono Schematic?
  55. Russian & East European Tube Factory Logos
  56. Lampizator Channel
  57. RIAA triode or pentode
  58. Cute Little Tube Oscilloscope, Thought I'd share.
  59. Is it really possible to deliver 2W into 40 ohms with an SET ?
  60. se
  61. Connecting Two Amps to Common Input
  62. Wiring Aikido using LSA/HPA switch
  63. Most exotic SET power amplifier
  64. Help with rogers cadet 3 integrated
  65. Opamps for servos in tube amps - Christmas gift from LT, 12-12-12!
  66. tube amp hum........normal or suggested fix?
  67. Building a beast: Stereo EL84 auto bias PP tube amp
  68. Becker Brescia auto radio
  69. Double feedback pentode Power Stage
  70. Anyone Using Guiguang 300b tubes?
  71. Where to get Audio Note Gaku-On service manual?
  72. Sanity Check - Input Transformer Overshoot
  73. TOA HA-355 vintage tube PA amp schematic
  74. EL34 PushPull UL Amp
  75. 6L6G emission too high
  76. Need help designing BIAS circuit for old Bell amp
  77. Heathkit A-5A 6L6 PP Integrated Amp
  78. Where to put the meter
  79. Radii GS-40pp
  80. Concept dilemma (pre/pwr/spud content)
  81. What to do with these Eimac tubes?
  82. Driving 211 with VT25 or EL34?
  83. DIY AMP start project - Help choosing one
  84. Pilot 248B Amp with weak channel
  85. 6H30 VA stage?
  86. What is the best way to connect DC filaments?
  87. suggestions for a parallel feed 45 amp?
  88. Counterpoint SA 5.1 repairs
  89. The Morgan Jones mini tube headphone Amplifier
  90. Borbely headphone amp
  91. Found An Amplifier In My Basement I'd Forgotten About & Learn It's Sought After
  92. Floating OPT oscilloscope measuraments
  93. I Wasn't Away That Long, What's WIth The Price Hikes On All My Old Toys?
  94. Channel voltage mismatch
  95. OS70/1750 datasheets
  96. Beautiful Chassis
  97. 6A4, 46 and 47...excellent sound tubes !!!!
  98. Is it Overkill to use Duelund Caps in Power Stage (Counterpoint SA-5.1)
  99. Quicksilver M135 Schematic?
  100. recognize this old amp?
  101. grey fogging inside 6sn7
  102. Point to point or pcb?
  103. Quad query
  104. Fixing a Velleman K4040 - Buzz HIss Crackle Blown Tubes
  105. Found Original Genalex 12AX7..Need Advice..
  106. OPT power rating and amplifier power
  107. 6BG6-GA
  108. EL84 driving EL84 SET with fixed bias
  109. P2P 6CG7 Input Buffer
  110. 865 in triode mode...anyone ever tried it?
  111. PP KT88 Amp Low frequency Ringing
  112. World audio designs kel34
  113. Glassware Audio Design
  114. 2A3 mounted horizontally
  115. from tube amp to fm reciever
  116. diy tube amp
  117. Cary 805ae xlr option
  118. ST-70 mono makeover
  119. breaking in audio capacitors
  120. Question about 6V6GT amp schematic
  121. Sherwood Schematic
  122. Ever hear of a D7L1 or D7L3 YR7 tube?
  123. Psvane Replica RCA 2A3 tube - WR2A3
  124. 845 Driver Circuit
  125. ADJUSTABLE BIAS MOD KIT
  126. Gold Lion B749 12au7 Thoughts?
  127. Siliconray SRK 09 tube amp kit help
  128. Quantum minstrel
  129. Does anyone know how John Lee Hooker recorded this? (1949)
  130. Please Identify these black capacitors.
  131. New Tubes too silent (6P15P)
  132. best sounding & value amp kits/designs?
  133. Custom Woodwork For Tube Amp
  134. Tube 2E22 in triode mode
  135. Has anyone built an OTL amp with switch mode power supplies.
  136. Altec 15067 transformers
  137. Some interesting findings with transformers
  138. Bogen KO-60 Output Iron
  139. What would you do with Scott 222D IRON?
  140. Aikido vs CCDA
  141. wiring color code
  142. Maverick Audio TubeMagic D1 DAC
  143. Is one gz34 enough
  144. Edcor OPT opinions
  145. mengyue mini/ming da el34b
  146. I need a tube buffer circuit using a 12au7
  147. Stereo Amplifier Wood Enclosure
  148. What is the theoretical advantage of direct heated triodes?
  149. 6AS6 is useful for audio ?
  150. GM-70 design approach
  151. Ultimate emotion core material ( types of silicon steel , Permalloy or Amorphous etc)
  152. Looking to build my first tube amplifier
  153. Tube/SS opamp
  154. Biasing 6CA7/EL34 in Luxman LX33
  155. John Broskie MIA again?
  156. combine filament winding for rectifier
  157. HYBRID TUBE CFP
  158. 9302 Maggie Rebuild
  159. Pyramid-IX monoblock, 200W from 4x GU-50
  160. Suggestions of phono stage to build
  161. Do power transformers affect sound quality?
  162. Help with a Velleman K4040 ...
  163. Capacitor replacement confusion
  164. RCA PA Amplifer, Input Transformers
  165. Channel imbalance Xiang Sheng DAC-01
  166. ARC M100s
  167. pros & cons of current mirror to balance a push-pull ?
  168. Wright Audio WLA10 help needed
  169. The Best tube/valve sound!?
  170. Mcintosh MC1000 and Ming Da MC300-PRE
  171. Operating Modern 845s
  172. The Transcendent Sound Son of Beast OTL Master/Mod Thread.
  173. Neutralizing An Amplifier
  174. Stacked speakers driven by an SEP amp?
  175. Tube buffer suggestion for LM4702 amplifier?
  176. FWB Voltage Doubler with -Bias supply
  177. 500V SE pentode design
  178. single ended transformer driving 32ohm speaker
  179. uC based Tube Curve Tracer Kit - Experts Opinion ?
  180. 250K Attenuator
  181. Possible to drive PP EL34-triodes with a cathodyne phase-splitter?
  182. Daughters POD amp 13EM7 Pics
  183. Calculating Ripple Current with PSUD2
  184. Channel problem on 45 converted amp
  185. Want to make a tube preamp
  186. Marantz TC-5 choke value
  187. diference between schematics and pcb layout
  188. Would this work?
  189. Can old resistors go bad?
  190. Strange output tube behaviour
  191. Practical question: toroidal transformer / heater current / kt120
  192. Morgan Jones Power supply cap values
  193. Can use a ballast for a PSU??
  194. Looking for a OTL tube headphone amp design
  195. Relative Humidity Attenuating HF
  196. Parallel Output transformer question
  197. Need help to ID a tube...
  198. Modifications to Sennheiser VKS 203
  199. Onix SP3 integrated amp latest schematic
  200. Omit sp3 integrated amp latest schematic
  201. Help: Western Electric 102A Tube Datasheet and Test Settings
  202. Power and output transformer separated from amplifier
  203. discrete and simple VCCS
  204. heater wiring question
  205. What is the deal with Welborne Labs?
  206. Center Channel
  207. input stage problem help please!
  208. Tube Tips/Tricks for beginners
  209. Any skilled custom tube amplifier builders out there?
  210. Are these tubes really matched?
  211. Single Ended Amp
  212. Mighty Midget Problems
  213. Run the tube stuff in your car
  214. Jackson 648 test for 6973
  215. Space-charge tetrodes in Inverted Mode
  216. choosing input valve
  217. Rectifier characteristics
  218. Glass-ware?
  219. 5751 Mil spec tubes vrs 12AX7
  220. 47 pentode...fabulous sound !!!!
  221. Aikido preamp transformer question
  222. 40's tube receiver question
  223. W5m transformer
  224. Dual voltage PS filtering.
  225. OD3 150V tube regulator
  226. Fisher 500c
  227. Help with quad cap upgrade
  228. low voltage hybrid power amplifier
  229. Morgan Jones Kapacitors
  230. Which IR LED?
  231. Tube Frequency Response
  232. Big B+ voltage drop using diode rectifier.
  233. Triode ST70 kit schematic?
  234. 6AU6 replacement
  235. IT in cathode for driver class A2 tube
  236. Bogen MX30 Output Transformers
  237. Worlds Most Expensive Tube Amp !!!
  238. Blown screen resistor
  239. Blown screen resistor
  240. To ground plane or not?
  241. 5Z4PA Alternative?
  242. Question about chassis ground
  243. 6337- wtf is it?
  244. need ideers for a 6 channel amp
  245. sv572 transformer headache
  246. 6C33C / 6EM7
  247. 6146 TUBES ?
  248. Impedance matching
  249. QRP03 - Tube Buffered Gainclone
  250. Amp Cage Fababricators?

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