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

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