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  1. NOS Tube: Black Spot on Getter Flashing? Help
  2. FET Source Follower Distortion
  3. TUBE/MOSFET/BJT hibrid amp
  4. PYE Black Box amplifier
  5. Tube tester
  6. what OPT for 211 parallel SE amp?
  7. Opinions for 6550 bias.
  8. 832A as a Single Ended Tetrode Amp?
  9. DCPP - "Engineer's Amplifier" : Need a bit of help
  10. quicky rebuild 6v6 to 807
  11. Old fire bottles.
  12. Regulated Power Supply using 6550
  13. GU50 SE vs 300B SE tube amp??
  14. Help with voltages
  15. New to valves & this forum.
  16. new amp 2a3 pp
  17. Telefunken EL153 SE circuity
  18. RH 84 Variation: Direct Coupled Pentode
  19. Single Transformer, two valve rectifiers
  20. Capacitors for Radio Frequency Amlifier and Converter Oscillator Tubes
  21. Tube Screening Cans
  22. PSU grounding
  23. 6AX4GT TV damper
  24. plate on chinese 6L6 red on one side
  25. FM stereo decoder
  26. Under the Christmas Tree - Valve Amplifiers 4th Ed.
  27. Using those dern 1625 tubes: a simple SEP amplifier
  28. Pairs of resistors in opposite directions
  29. 45 spice model
  30. APEX 460 Tube mic modification
  31. EL84 and 6BQ5 are Same?
  32. Simple hybrid amplifier (35W/8Ohm)
  33. Yaqin mc 10l or qinpu 6000 mkii
  34. Reported attack site?
  35. LCR RIAA Phono with DHTs
  36. New Here -Would Like to Build
  37. 12E1 push pull poweramp
  38. marantz model 9
  39. I would appreciate some helpfull advice from Aikido builders
  40. Dynaco ST70 big Snorting noise.
  41. Good Soft Distortion
  42. magnavox 8301 revamp, need's a second look
  43. Circuit or schematic for current source of 7.5mA
  44. Sakuma's bleeder tubes and series connected transfomers
  45. Tube measurement
  46. adding tone control to SE 6v6 amp
  47. Easy Little 6L6 SE
  48. knight KA-55
  49. Hum in tube amp
  50. Lundahl LL1660 10 mA Alt V
  51. 12au7 valve preamp (again?)
  52. Simple DC heating question
  53. 6146B?
  54. Reduce gain on power amp?
  55. ES9023 DAC(subbu) + Tube Preamp with Remote and R2R volume control(Danzup)
  56. AC heaters question
  57. Anyone tried this Mcintosh c22 knock off.
  58. Help me to find pins for tube socket
  59. HT delay pcb...
  60. Power supply, heater questions...
  61. Heathkit AA-151, to separate pre-amp advise needed?
  62. grounding
  63. 2 Stage GM-70 amp in A2... possible?
  64. GlassWare Janus Shunt Rectifier Tube Swap
  65. Schematics
  66. SE 6B4G driver tube options?
  67. seeking datasheet of 6J2B-V in english
  68. Nailing Hum in my Phono Stage
  69. Shaving voltage off HV supply?
  70. LEAK T12 and POINT ONE - worth having ?
  71. Quicksilvers Mid Mono Schematic?
  72. Russian & East European Tube Factory Logos
  73. Lampizator Channel
  74. RIAA triode or pentode
  75. Cute Little Tube Oscilloscope, Thought I'd share.
  76. Is it really possible to deliver 2W into 40 ohms with an SET ?
  77. se
  78. Connecting Two Amps to Common Input
  79. Wiring Aikido using LSA/HPA switch
  80. Most exotic SET power amplifier
  81. Help with rogers cadet 3 integrated
  82. Opamps for servos in tube amps - Christmas gift from LT, 12-12-12!
  83. tube amp hum........normal or suggested fix?
  84. Building a beast: Stereo EL84 auto bias PP tube amp
  85. Becker Brescia auto radio
  86. Double feedback pentode Power Stage
  87. Anyone Using Guiguang 300b tubes?
  88. Where to get Audio Note Gaku-On service manual?
  89. Sanity Check - Input Transformer Overshoot
  90. TOA HA-355 vintage tube PA amp schematic
  91. EL34 PushPull UL Amp
  92. 6L6G emission too high
  93. Need help designing BIAS circuit for old Bell amp
  94. Heathkit A-5A 6L6 PP Integrated Amp
  95. Where to put the meter
  96. Radii GS-40pp
  97. Concept dilemma (pre/pwr/spud content)
  98. What to do with these Eimac tubes?
  99. Driving 211 with VT25 or EL34?
  100. DIY AMP start project - Help choosing one
  101. Pilot 248B Amp with weak channel
  102. 6H30 VA stage?
  103. What is the best way to connect DC filaments?
  104. suggestions for a parallel feed 45 amp?
  105. Counterpoint SA 5.1 repairs
  106. The Morgan Jones mini tube headphone Amplifier
  107. Borbely headphone amp
  108. Found An Amplifier In My Basement I'd Forgotten About & Learn It's Sought After
  109. Floating OPT oscilloscope measuraments
  110. I Wasn't Away That Long, What's WIth The Price Hikes On All My Old Toys?
  111. Channel voltage mismatch
  112. OS70/1750 datasheets
  113. Beautiful Chassis
  114. 6A4, 46 and 47...excellent sound tubes !!!!
  115. Is it Overkill to use Duelund Caps in Power Stage (Counterpoint SA-5.1)
  116. Quicksilver M135 Schematic?
  117. recognize this old amp?
  118. grey fogging inside 6sn7
  119. Point to point or pcb?
  120. Quad query
  121. Fixing a Velleman K4040 - Buzz HIss Crackle Blown Tubes
  122. Found Original Genalex 12AX7..Need Advice..
  123. OPT power rating and amplifier power
  124. 6BG6-GA
  125. EL84 driving EL84 SET with fixed bias
  126. P2P 6CG7 Input Buffer
  127. 865 in triode mode...anyone ever tried it?
  128. PP KT88 Amp Low frequency Ringing
  129. World audio designs kel34
  130. Glassware Audio Design
  131. 2A3 mounted horizontally
  132. from tube amp to fm reciever
  133. diy tube amp
  134. Cary 805ae xlr option
  135. ST-70 mono makeover
  136. breaking in audio capacitors
  137. Question about 6V6GT amp schematic
  138. Sherwood Schematic
  139. Ever hear of a D7L1 or D7L3 YR7 tube?
  140. Psvane Replica RCA 2A3 tube - WR2A3
  141. 845 Driver Circuit
  142. ADJUSTABLE BIAS MOD KIT
  143. Gold Lion B749 12au7 Thoughts?
  144. Siliconray SRK 09 tube amp kit help
  145. Quantum minstrel
  146. Does anyone know how John Lee Hooker recorded this? (1949)
  147. Please Identify these black capacitors.
  148. New Tubes too silent (6P15P)
  149. best sounding & value amp kits/designs?
  150. Custom Woodwork For Tube Amp
  151. Tube 2E22 in triode mode
  152. Has anyone built an OTL amp with switch mode power supplies.
  153. Altec 15067 transformers
  154. Some interesting findings with transformers
  155. Bogen KO-60 Output Iron
  156. What would you do with Scott 222D IRON?
  157. Aikido vs CCDA
  158. wiring color code
  159. Maverick Audio TubeMagic D1 DAC
  160. Is one gz34 enough
  161. Edcor OPT opinions
  162. mengyue mini/ming da el34b
  163. I need a tube buffer circuit using a 12au7
  164. Stereo Amplifier Wood Enclosure
  165. What is the theoretical advantage of direct heated triodes?
  166. 6AS6 is useful for audio ?
  167. GM-70 design approach
  168. Ultimate emotion core material ( types of silicon steel , Permalloy or Amorphous etc)
  169. Looking to build my first tube amplifier
  170. Tube/SS opamp
  171. Biasing 6CA7/EL34 in Luxman LX33
  172. John Broskie MIA again?
  173. combine filament winding for rectifier
  174. HYBRID TUBE CFP
  175. 9302 Maggie Rebuild
  176. Pyramid-IX monoblock, 200W from 4x GU-50
  177. Suggestions of phono stage to build
  178. Do power transformers affect sound quality?
  179. Help with a Velleman K4040 ...
  180. Capacitor replacement confusion
  181. RCA PA Amplifer, Input Transformers
  182. Channel imbalance Xiang Sheng DAC-01
  183. ARC M100s
  184. pros & cons of current mirror to balance a push-pull ?
  185. Wright Audio WLA10 help needed
  186. The Best tube/valve sound!?
  187. Mcintosh MC1000 and Ming Da MC300-PRE
  188. Operating Modern 845s
  189. The Transcendent Sound Son of Beast OTL Master/Mod Thread.
  190. Neutralizing An Amplifier
  191. Stacked speakers driven by an SEP amp?
  192. Tube buffer suggestion for LM4702 amplifier?
  193. FWB Voltage Doubler with -Bias supply
  194. 500V SE pentode design
  195. single ended transformer driving 32ohm speaker
  196. uC based Tube Curve Tracer Kit - Experts Opinion ?
  197. 250K Attenuator
  198. Possible to drive PP EL34-triodes with a cathodyne phase-splitter?
  199. Daughters POD amp 13EM7 Pics
  200. Calculating Ripple Current with PSUD2
  201. Channel problem on 45 converted amp
  202. Want to make a tube preamp
  203. Marantz TC-5 choke value
  204. diference between schematics and pcb layout
  205. Would this work?
  206. Can old resistors go bad?
  207. Strange output tube behaviour
  208. Practical question: toroidal transformer / heater current / kt120
  209. Morgan Jones Power supply cap values
  210. Can use a ballast for a PSU??
  211. Looking for a OTL tube headphone amp design
  212. Relative Humidity Attenuating HF
  213. Parallel Output transformer question
  214. Need help to ID a tube...
  215. Modifications to Sennheiser VKS 203
  216. Onix SP3 integrated amp latest schematic
  217. Omit sp3 integrated amp latest schematic
  218. Help: Western Electric 102A Tube Datasheet and Test Settings
  219. Power and output transformer separated from amplifier
  220. discrete and simple VCCS
  221. heater wiring question
  222. What is the deal with Welborne Labs?
  223. Center Channel
  224. input stage problem help please!
  225. Tube Tips/Tricks for beginners
  226. Any skilled custom tube amplifier builders out there?
  227. Are these tubes really matched?
  228. Single Ended Amp
  229. Mighty Midget Problems
  230. Run the tube stuff in your car
  231. Jackson 648 test for 6973
  232. Space-charge tetrodes in Inverted Mode
  233. choosing input valve
  234. Rectifier characteristics
  235. Glass-ware?
  236. 5751 Mil spec tubes vrs 12AX7
  237. 47 pentode...fabulous sound !!!!
  238. Aikido preamp transformer question
  239. 40's tube receiver question
  240. W5m transformer
  241. Dual voltage PS filtering.
  242. OD3 150V tube regulator
  243. Fisher 500c
  244. Help with quad cap upgrade
  245. low voltage hybrid power amplifier
  246. Morgan Jones Kapacitors
  247. Which IR LED?
  248. Tube Frequency Response
  249. Big B+ voltage drop using diode rectifier.
  250. Triode ST70 kit schematic?

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