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  1. Mic preamp - strange high frequency roll off problem
  2. Tissbury audio
  3. midification to srpp preamplifier input voltage
  4. DHT SE amp with ultrapath
  5. Tube mic preamp problem
  6. Output transformer: reasons for destruction?
  7. Bewitch KT88
  8. SE OPT Wiring
  9. Budget 300b tubes recommendations
  10. Hum problem through one channel
  11. Audio Research LS22 DIY
  12. 300V Tube Power Supply From 120VAC Without Rectifier?
  13. NOS Tube: Black Spot on Getter Flashing? Help
  14. FET Source Follower Distortion
  15. TUBE/MOSFET/BJT hibrid amp
  16. PYE Black Box amplifier
  17. Tube tester
  18. what OPT for 211 parallel SE amp?
  19. Opinions for 6550 bias.
  20. 832A as a Single Ended Tetrode Amp?
  21. DCPP - "Engineer's Amplifier" : Need a bit of help
  22. quicky rebuild 6v6 to 807
  23. Old fire bottles.
  24. Regulated Power Supply using 6550
  25. GU50 SE vs 300B SE tube amp??
  26. Help with voltages
  27. New to valves & this forum.
  28. new amp 2a3 pp
  29. Telefunken EL153 SE circuity
  30. RH 84 Variation: Direct Coupled Pentode
  31. Single Transformer, two valve rectifiers
  32. Capacitors for Radio Frequency Amlifier and Converter Oscillator Tubes
  33. Tube Screening Cans
  34. PSU grounding
  35. 6AX4GT TV damper
  36. plate on chinese 6L6 red on one side
  37. FM stereo decoder
  38. Under the Christmas Tree - Valve Amplifiers 4th Ed.
  39. Using those dern 1625 tubes: a simple SEP amplifier
  40. Pairs of resistors in opposite directions
  41. 45 spice model
  42. APEX 460 Tube mic modification
  43. EL84 and 6BQ5 are Same?
  44. Simple hybrid amplifier (35W/8Ohm)
  45. Yaqin mc 10l or qinpu 6000 mkii
  46. Reported attack site?
  47. LCR RIAA Phono with DHTs
  48. New Here -Would Like to Build
  49. 12E1 push pull poweramp
  50. marantz model 9
  51. I would appreciate some helpfull advice from Aikido builders
  52. Dynaco ST70 big Snorting noise.
  53. Good Soft Distortion
  54. magnavox 8301 revamp, need's a second look
  55. Circuit or schematic for current source of 7.5mA
  56. Sakuma's bleeder tubes and series connected transfomers
  57. Tube measurement
  58. adding tone control to SE 6v6 amp
  59. Easy Little 6L6 SE
  60. knight KA-55
  61. Hum in tube amp
  62. Lundahl LL1660 10 mA Alt V
  63. 12au7 valve preamp (again?)
  64. Simple DC heating question
  65. 6146B?
  66. Reduce gain on power amp?
  67. ES9023 DAC(subbu) + Tube Preamp with Remote and R2R volume control(Danzup)
  68. AC heaters question
  69. Anyone tried this Mcintosh c22 knock off.
  70. Help me to find pins for tube socket
  71. HT delay pcb...
  72. Power supply, heater questions...
  73. Heathkit AA-151, to separate pre-amp advise needed?
  74. grounding
  75. 2 Stage GM-70 amp in A2... possible?
  76. GlassWare Janus Shunt Rectifier Tube Swap
  77. Schematics
  78. SE 6B4G driver tube options?
  79. seeking datasheet of 6J2B-V in english
  80. Nailing Hum in my Phono Stage
  81. Shaving voltage off HV supply?
  82. LEAK T12 and POINT ONE - worth having ?
  83. Quicksilvers Mid Mono Schematic?
  84. Russian & East European Tube Factory Logos
  85. Lampizator Channel
  86. RIAA triode or pentode
  87. Cute Little Tube Oscilloscope, Thought I'd share.
  88. Is it really possible to deliver 2W into 40 ohms with an SET ?
  89. se
  90. Connecting Two Amps to Common Input
  91. Wiring Aikido using LSA/HPA switch
  92. Most exotic SET power amplifier
  93. Help with rogers cadet 3 integrated
  94. Opamps for servos in tube amps - Christmas gift from LT, 12-12-12!
  95. tube amp hum........normal or suggested fix?
  96. Building a beast: Stereo EL84 auto bias PP tube amp
  97. Becker Brescia auto radio
  98. Double feedback pentode Power Stage
  99. Anyone Using Guiguang 300b tubes?
  100. Where to get Audio Note Gaku-On service manual?
  101. Sanity Check - Input Transformer Overshoot
  102. TOA HA-355 vintage tube PA amp schematic
  103. EL34 PushPull UL Amp
  104. 6L6G emission too high
  105. Need help designing BIAS circuit for old Bell amp
  106. Heathkit A-5A 6L6 PP Integrated Amp
  107. Where to put the meter
  108. Radii GS-40pp
  109. Concept dilemma (pre/pwr/spud content)
  110. What to do with these Eimac tubes?
  111. Driving 211 with VT25 or EL34?
  112. DIY AMP start project - Help choosing one
  113. Pilot 248B Amp with weak channel
  114. 6H30 VA stage?
  115. What is the best way to connect DC filaments?
  116. suggestions for a parallel feed 45 amp?
  117. Counterpoint SA 5.1 repairs
  118. The Morgan Jones mini tube headphone Amplifier
  119. Borbely headphone amp
  120. Found An Amplifier In My Basement I'd Forgotten About & Learn It's Sought After
  121. Floating OPT oscilloscope measuraments
  122. I Wasn't Away That Long, What's WIth The Price Hikes On All My Old Toys?
  123. Channel voltage mismatch
  124. OS70/1750 datasheets
  125. Beautiful Chassis
  126. 6A4, 46 and 47...excellent sound tubes !!!!
  127. Is it Overkill to use Duelund Caps in Power Stage (Counterpoint SA-5.1)
  128. Quicksilver M135 Schematic?
  129. recognize this old amp?
  130. grey fogging inside 6sn7
  131. Point to point or pcb?
  132. Quad query
  133. Fixing a Velleman K4040 - Buzz HIss Crackle Blown Tubes
  134. Found Original Genalex 12AX7..Need Advice..
  135. OPT power rating and amplifier power
  136. 6BG6-GA
  137. EL84 driving EL84 SET with fixed bias
  138. P2P 6CG7 Input Buffer
  139. 865 in triode mode...anyone ever tried it?
  140. PP KT88 Amp Low frequency Ringing
  141. World audio designs kel34
  142. Glassware Audio Design
  143. 2A3 mounted horizontally
  144. from tube amp to fm reciever
  145. diy tube amp
  146. Cary 805ae xlr option
  147. ST-70 mono makeover
  148. breaking in audio capacitors
  149. Question about 6V6GT amp schematic
  150. Sherwood Schematic
  151. Ever hear of a D7L1 or D7L3 YR7 tube?
  152. Psvane Replica RCA 2A3 tube - WR2A3
  153. 845 Driver Circuit
  154. ADJUSTABLE BIAS MOD KIT
  155. Gold Lion B749 12au7 Thoughts?
  156. Siliconray SRK 09 tube amp kit help
  157. Quantum minstrel
  158. Does anyone know how John Lee Hooker recorded this? (1949)
  159. Please Identify these black capacitors.
  160. New Tubes too silent (6P15P)
  161. best sounding & value amp kits/designs?
  162. Custom Woodwork For Tube Amp
  163. Tube 2E22 in triode mode
  164. Has anyone built an OTL amp with switch mode power supplies.
  165. Altec 15067 transformers
  166. Some interesting findings with transformers
  167. Bogen KO-60 Output Iron
  168. What would you do with Scott 222D IRON?
  169. Aikido vs CCDA
  170. wiring color code
  171. Maverick Audio TubeMagic D1 DAC
  172. Is one gz34 enough
  173. Edcor OPT opinions
  174. mengyue mini/ming da el34b
  175. I need a tube buffer circuit using a 12au7
  176. Stereo Amplifier Wood Enclosure
  177. What is the theoretical advantage of direct heated triodes?
  178. 6AS6 is useful for audio ?
  179. GM-70 design approach
  180. Ultimate emotion core material ( types of silicon steel , Permalloy or Amorphous etc)
  181. Looking to build my first tube amplifier
  182. Tube/SS opamp
  183. Biasing 6CA7/EL34 in Luxman LX33
  184. John Broskie MIA again?
  185. combine filament winding for rectifier
  186. HYBRID TUBE CFP
  187. 9302 Maggie Rebuild
  188. Pyramid-IX monoblock, 200W from 4x GU-50
  189. Suggestions of phono stage to build
  190. Do power transformers affect sound quality?
  191. Help with a Velleman K4040 ...
  192. RCA PA Amplifer, Input Transformers
  193. Channel imbalance Xiang Sheng DAC-01
  194. ARC M100s
  195. pros & cons of current mirror to balance a push-pull ?
  196. Wright Audio WLA10 help needed
  197. The Best tube/valve sound!?
  198. Mcintosh MC1000 and Ming Da MC300-PRE
  199. Operating Modern 845s
  200. The Transcendent Sound Son of Beast OTL Master/Mod Thread.
  201. Neutralizing An Amplifier
  202. Stacked speakers driven by an SEP amp?
  203. Tube buffer suggestion for LM4702 amplifier?
  204. FWB Voltage Doubler with -Bias supply
  205. 500V SE pentode design
  206. single ended transformer driving 32ohm speaker
  207. uC based Tube Curve Tracer Kit - Experts Opinion ?
  208. 250K Attenuator
  209. Possible to drive PP EL34-triodes with a cathodyne phase-splitter?
  210. Daughters POD amp 13EM7 Pics
  211. Calculating Ripple Current with PSUD2
  212. Channel problem on 45 converted amp
  213. Want to make a tube preamp
  214. Marantz TC-5 choke value
  215. diference between schematics and pcb layout
  216. Would this work?
  217. Can old resistors go bad?
  218. Strange output tube behaviour
  219. Practical question: toroidal transformer / heater current / kt120
  220. Morgan Jones Power supply cap values
  221. Can use a ballast for a PSU??
  222. Looking for a OTL tube headphone amp design
  223. Relative Humidity Attenuating HF
  224. Parallel Output transformer question
  225. Need help to ID a tube...
  226. Modifications to Sennheiser VKS 203
  227. Onix SP3 integrated amp latest schematic
  228. Omit sp3 integrated amp latest schematic
  229. Help: Western Electric 102A Tube Datasheet and Test Settings
  230. Power and output transformer separated from amplifier
  231. discrete and simple VCCS
  232. heater wiring question
  233. What is the deal with Welborne Labs?
  234. Center Channel
  235. input stage problem help please!
  236. Tube Tips/Tricks for beginners
  237. Any skilled custom tube amplifier builders out there?
  238. Are these tubes really matched?
  239. Single Ended Amp
  240. Mighty Midget Problems
  241. Run the tube stuff in your car
  242. Jackson 648 test for 6973
  243. Space-charge tetrodes in Inverted Mode
  244. choosing input valve
  245. Rectifier characteristics
  246. Glass-ware?
  247. 5751 Mil spec tubes vrs 12AX7
  248. 47 pentode...fabulous sound !!!!
  249. Aikido preamp transformer question
  250. 40's tube receiver question

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