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  1. Preamp Grounding PCB
  2. Manley 440: Tubes red cherry after replacing old tubes with new ones
  3. EL95 Parallel Push Pull design
  4. What is the ideal low-noise heater power for high-power output tubes?
  5. Beijing 6N6T
  6. Tube recomedations for my first tube amp
  7. Tube Load Lines and B+
  8. Hybrid rectifier possible in PSUD?
  9. Hickok calibration
  10. Bias voltage slower to come up
  11. Can You Reccommend a 6922 tube?
  12. Miniblok Resistor Parameter Modulation using Pots
  13. gm70 driver tube tests
  14. 300B Globe physical dimensions
  15. DIY Fisher 800b into a mic pre
  16. OPT Modification Question-Help please?
  17. Cant find origin
  18. Fixing Sneaky Oscillation in P-P Amplifiers
  19. fu-29 Audioromy
  20. Almarro A205A as experimentation platform
  21. Thoughts on layout and potential for improvements
  22. What is the difference between "rectifier tubes" and "power tubes"
  23. uTracer...
  24. EL84/UL84 single valve amp
  25. Mic preamp - strange high frequency roll off problem
  26. Tissbury audio
  27. midification to srpp preamplifier input voltage
  28. DHT SE amp with ultrapath
  29. Tube mic preamp problem
  30. Output transformer: reasons for destruction?
  31. Bewitch KT88
  32. SE OPT Wiring
  33. maggie 185 to stereo guitar amp?
  34. Budget 300b tubes recommendations
  35. Hum problem through one channel
  36. Audio Research LS22 DIY
  37. 300V Tube Power Supply From 120VAC Without Rectifier?
  38. NOS Tube: Black Spot on Getter Flashing? Help
  39. FET Source Follower Distortion
  40. TUBE/MOSFET/BJT hibrid amp
  41. PYE Black Box amplifier
  42. Tube tester
  43. what OPT for 211 parallel SE amp?
  44. Opinions for 6550 bias.
  45. 832A as a Single Ended Tetrode Amp?
  46. DCPP - "Engineer's Amplifier" : Need a bit of help
  47. quicky rebuild 6v6 to 807
  48. Old fire bottles.
  49. Regulated Power Supply using 6550
  50. GU50 SE vs 300B SE tube amp??
  51. Help with voltages
  52. New to valves & this forum.
  53. new amp 2a3 pp
  54. Telefunken EL153 SE circuity
  55. RH 84 Variation: Direct Coupled Pentode
  56. Single Transformer, two valve rectifiers
  57. Capacitors for Radio Frequency Amlifier and Converter Oscillator Tubes
  58. Tube Screening Cans
  59. PSU grounding
  60. 6AX4GT TV damper
  61. plate on chinese 6L6 red on one side
  62. FM stereo decoder
  63. Under the Christmas Tree - Valve Amplifiers 4th Ed.
  64. Using those dern 1625 tubes: a simple SEP amplifier
  65. Pairs of resistors in opposite directions
  66. 45 spice model
  67. APEX 460 Tube mic modification
  68. EL84 and 6BQ5 are Same?
  69. Simple hybrid amplifier (35W/8Ohm)
  70. Yaqin mc 10l or qinpu 6000 mkii
  71. Reported attack site?
  72. LCR RIAA Phono with DHTs
  73. New Here -Would Like to Build
  74. 12E1 push pull poweramp
  75. marantz model 9
  76. I would appreciate some helpfull advice from Aikido builders
  77. Dynaco ST70 big Snorting noise.
  78. Good Soft Distortion
  79. magnavox 8301 revamp, need's a second look
  80. Circuit or schematic for current source of 7.5mA
  81. Sakuma's bleeder tubes and series connected transfomers
  82. Tube measurement
  83. adding tone control to SE 6v6 amp
  84. Easy Little 6L6 SE
  85. knight KA-55
  86. Hum in tube amp
  87. Lundahl LL1660 10 mA Alt V
  88. 12au7 valve preamp (again?)
  89. Simple DC heating question
  90. 6146B?
  91. Reduce gain on power amp?
  92. ES9023 DAC(subbu) + Tube Preamp with Remote and R2R volume control(Danzup)
  93. AC heaters question
  94. Anyone tried this Mcintosh c22 knock off.
  95. Help me to find pins for tube socket
  96. HT delay pcb...
  97. Power supply, heater questions...
  98. Heathkit AA-151, to separate pre-amp advise needed?
  99. grounding
  100. 2 Stage GM-70 amp in A2... possible?
  101. GlassWare Janus Shunt Rectifier Tube Swap
  102. Schematics
  103. SE 6B4G driver tube options?
  104. seeking datasheet of 6J2B-V in english
  105. Nailing Hum in my Phono Stage
  106. Shaving voltage off HV supply?
  107. LEAK T12 and POINT ONE - worth having ?
  108. Quicksilvers Mid Mono Schematic?
  109. Russian & East European Tube Factory Logos
  110. Lampizator Channel
  111. RIAA triode or pentode
  112. Cute Little Tube Oscilloscope, Thought I'd share.
  113. Is it really possible to deliver 2W into 40 ohms with an SET ?
  114. se
  115. Connecting Two Amps to Common Input
  116. Wiring Aikido using LSA/HPA switch
  117. Most exotic SET power amplifier
  118. Help with rogers cadet 3 integrated
  119. Opamps for servos in tube amps - Christmas gift from LT, 12-12-12!
  120. tube amp hum........normal or suggested fix?
  121. Building a beast: Stereo EL84 auto bias PP tube amp
  122. Becker Brescia auto radio
  123. Double feedback pentode Power Stage
  124. Anyone Using Guiguang 300b tubes?
  125. Where to get Audio Note Gaku-On service manual?
  126. Sanity Check - Input Transformer Overshoot
  127. TOA HA-355 vintage tube PA amp schematic
  128. EL34 PushPull UL Amp
  129. 6L6G emission too high
  130. Need help designing BIAS circuit for old Bell amp
  131. Heathkit A-5A 6L6 PP Integrated Amp
  132. Where to put the meter
  133. Radii GS-40pp
  134. Concept dilemma (pre/pwr/spud content)
  135. What to do with these Eimac tubes?
  136. Driving 211 with VT25 or EL34?
  137. DIY AMP start project - Help choosing one
  138. Pilot 248B Amp with weak channel
  139. 6H30 VA stage?
  140. What is the best way to connect DC filaments?
  141. suggestions for a parallel feed 45 amp?
  142. Counterpoint SA 5.1 repairs
  143. The Morgan Jones mini tube headphone Amplifier
  144. Borbely headphone amp
  145. Found An Amplifier In My Basement I'd Forgotten About & Learn It's Sought After
  146. Floating OPT oscilloscope measuraments
  147. I Wasn't Away That Long, What's WIth The Price Hikes On All My Old Toys?
  148. Channel voltage mismatch
  149. OS70/1750 datasheets
  150. Beautiful Chassis
  151. 6A4, 46 and 47...excellent sound tubes !!!!
  152. Is it Overkill to use Duelund Caps in Power Stage (Counterpoint SA-5.1)
  153. Quicksilver M135 Schematic?
  154. recognize this old amp?
  155. grey fogging inside 6sn7
  156. Point to point or pcb?
  157. Quad query
  158. Fixing a Velleman K4040 - Buzz HIss Crackle Blown Tubes
  159. Found Original Genalex 12AX7..Need Advice..
  160. OPT power rating and amplifier power
  161. 6BG6-GA
  162. EL84 driving EL84 SET with fixed bias
  163. P2P 6CG7 Input Buffer
  164. 865 in triode mode...anyone ever tried it?
  165. PP KT88 Amp Low frequency Ringing
  166. World audio designs kel34
  167. Glassware Audio Design
  168. 2A3 mounted horizontally
  169. from tube amp to fm reciever
  170. diy tube amp
  171. Cary 805ae xlr option
  172. ST-70 mono makeover
  173. breaking in audio capacitors
  174. Question about 6V6GT amp schematic
  175. Sherwood Schematic
  176. Ever hear of a D7L1 or D7L3 YR7 tube?
  177. Psvane Replica RCA 2A3 tube - WR2A3
  178. 845 Driver Circuit
  179. ADJUSTABLE BIAS MOD KIT
  180. Gold Lion B749 12au7 Thoughts?
  181. Siliconray SRK 09 tube amp kit help
  182. Quantum minstrel
  183. Does anyone know how John Lee Hooker recorded this? (1949)
  184. Please Identify these black capacitors.
  185. New Tubes too silent (6P15P)
  186. best sounding & value amp kits/designs?
  187. Custom Woodwork For Tube Amp
  188. Tube 2E22 in triode mode
  189. Has anyone built an OTL amp with switch mode power supplies.
  190. Altec 15067 transformers
  191. Some interesting findings with transformers
  192. Bogen KO-60 Output Iron
  193. What would you do with Scott 222D IRON?
  194. Aikido vs CCDA
  195. wiring color code
  196. Maverick Audio TubeMagic D1 DAC
  197. Is one gz34 enough
  198. Edcor OPT opinions
  199. mengyue mini/ming da el34b
  200. I need a tube buffer circuit using a 12au7
  201. Stereo Amplifier Wood Enclosure
  202. What is the theoretical advantage of direct heated triodes?
  203. 6AS6 is useful for audio ?
  204. GM-70 design approach
  205. Ultimate emotion core material ( types of silicon steel , Permalloy or Amorphous etc)
  206. Looking to build my first tube amplifier
  207. Tube/SS opamp
  208. Biasing 6CA7/EL34 in Luxman LX33
  209. John Broskie MIA again?
  210. combine filament winding for rectifier
  211. HYBRID TUBE CFP
  212. 9302 Maggie Rebuild
  213. Pyramid-IX monoblock, 200W from 4x GU-50
  214. Suggestions of phono stage to build
  215. Do power transformers affect sound quality?
  216. Help with a Velleman K4040 ...
  217. Capacitor replacement confusion
  218. RCA PA Amplifer, Input Transformers
  219. Channel imbalance Xiang Sheng DAC-01
  220. ARC M100s
  221. pros & cons of current mirror to balance a push-pull ?
  222. Wright Audio WLA10 help needed
  223. The Best tube/valve sound!?
  224. Mcintosh MC1000 and Ming Da MC300-PRE
  225. Operating Modern 845s
  226. The Transcendent Sound Son of Beast OTL Master/Mod Thread.
  227. Neutralizing An Amplifier
  228. Stacked speakers driven by an SEP amp?
  229. Tube buffer suggestion for LM4702 amplifier?
  230. FWB Voltage Doubler with -Bias supply
  231. 500V SE pentode design
  232. single ended transformer driving 32ohm speaker
  233. uC based Tube Curve Tracer Kit - Experts Opinion ?
  234. 250K Attenuator
  235. Possible to drive PP EL34-triodes with a cathodyne phase-splitter?
  236. Daughters POD amp 13EM7 Pics
  237. Calculating Ripple Current with PSUD2
  238. Channel problem on 45 converted amp
  239. Want to make a tube preamp
  240. Marantz TC-5 choke value
  241. diference between schematics and pcb layout
  242. Would this work?
  243. Can old resistors go bad?
  244. Strange output tube behaviour
  245. Practical question: toroidal transformer / heater current / kt120
  246. Morgan Jones Power supply cap values
  247. Can use a ballast for a PSU??
  248. Looking for a OTL tube headphone amp design
  249. Relative Humidity Attenuating HF
  250. Parallel Output transformer question

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