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  1. What should I build
  2. leak st20
  3. Wright Audio WPA 3.5 Humpot & schematics
  4. the old light bulb trick
  5. Dynaco ST70 KIT - your opinion please
  6. Wire for tubes using a plate cap?
  7. Lundahl LL1660 OPT Franks 6SN7 linestage
  8. GU-50 PP + 10k:16-8-4 Ohm ,20w OPT..what is the best to do?
  9. Tomiko 10k PP transformer?
  10. Powerdrive for higher grid wattage A2 transmitter tubes
  11. Marantz Model 5 Amps and Model Seven Preamp
  12. How to calculate output transformers
  13. Grounding considerations with external PS
  14. Cathodyne fet buffered balanced line out
  15. 807pp + input phase splitter
  16. leak st 20
  17. Questions about Champ mods, NF loop and more
  18. Does anyone know what this is!..???
  19. Thought Exercise: Submini Circlotron OTL Amp
  20. Preamp Grounding PCB
  21. Manley 440: Tubes red cherry after replacing old tubes with new ones
  22. EL95 Parallel Push Pull design
  23. What is the ideal low-noise heater power for high-power output tubes?
  24. Beijing 6N6T
  25. Tube recomedations for my first tube amp
  26. Tube Load Lines and B+
  27. Hybrid rectifier possible in PSUD?
  28. Hickok calibration
  29. Bias voltage slower to come up
  30. Can You Reccommend a 6922 tube?
  31. Miniblok Resistor Parameter Modulation using Pots
  32. gm70 driver tube tests
  33. 300B Globe physical dimensions
  34. DIY Fisher 800b into a mic pre
  35. OPT Modification Question-Help please?
  36. Cant find origin
  37. Fixing Sneaky Oscillation in P-P Amplifiers
  38. fu-29 Audioromy
  39. Almarro A205A as experimentation platform
  40. Thoughts on layout and potential for improvements
  41. What is the difference between "rectifier tubes" and "power tubes"
  42. uTracer...
  43. EL84/UL84 single valve amp
  44. Mic preamp - strange high frequency roll off problem
  45. Tissbury audio
  46. midification to srpp preamplifier input voltage
  47. DHT SE amp with ultrapath
  48. Tube mic preamp problem
  49. Output transformer: reasons for destruction?
  50. Bewitch KT88
  51. SE OPT Wiring
  52. maggie 185 to stereo guitar amp?
  53. Budget 300b tubes recommendations
  54. Hum problem through one channel
  55. Audio Research LS22 DIY
  56. 300V Tube Power Supply From 120VAC Without Rectifier?
  57. NOS Tube: Black Spot on Getter Flashing? Help
  58. FET Source Follower Distortion
  59. TUBE/MOSFET/BJT hibrid amp
  60. PYE Black Box amplifier
  61. Tube tester
  62. what OPT for 211 parallel SE amp?
  63. Opinions for 6550 bias.
  64. 832A as a Single Ended Tetrode Amp?
  65. DCPP - "Engineer's Amplifier" : Need a bit of help
  66. quicky rebuild 6v6 to 807
  67. Old fire bottles.
  68. Regulated Power Supply using 6550
  69. GU50 SE vs 300B SE tube amp??
  70. Help with voltages
  71. New to valves & this forum.
  72. new amp 2a3 pp
  73. Telefunken EL153 SE circuity
  74. RH 84 Variation: Direct Coupled Pentode
  75. Single Transformer, two valve rectifiers
  76. Capacitors for Radio Frequency Amlifier and Converter Oscillator Tubes
  77. Tube Screening Cans
  78. PSU grounding
  79. 6AX4GT TV damper
  80. plate on chinese 6L6 red on one side
  81. FM stereo decoder
  82. Under the Christmas Tree - Valve Amplifiers 4th Ed.
  83. Using those dern 1625 tubes: a simple SEP amplifier
  84. Pairs of resistors in opposite directions
  85. 45 spice model
  86. APEX 460 Tube mic modification
  87. EL84 and 6BQ5 are Same?
  88. Simple hybrid amplifier (35W/8Ohm)
  89. Yaqin mc 10l or qinpu 6000 mkii
  90. Reported attack site?
  91. LCR RIAA Phono with DHTs
  92. New Here -Would Like to Build
  93. 12E1 push pull poweramp
  94. marantz model 9
  95. I would appreciate some helpfull advice from Aikido builders
  96. Dynaco ST70 big Snorting noise.
  97. Good Soft Distortion
  98. magnavox 8301 revamp, need's a second look
  99. Circuit or schematic for current source of 7.5mA
  100. Sakuma's bleeder tubes and series connected transfomers
  101. Tube measurement
  102. adding tone control to SE 6v6 amp
  103. Easy Little 6L6 SE
  104. knight KA-55
  105. Hum in tube amp
  106. Lundahl LL1660 10 mA Alt V
  107. 12au7 valve preamp (again?)
  108. Simple DC heating question
  109. 6146B?
  110. Reduce gain on power amp?
  111. ES9023 DAC(subbu) + Tube Preamp with Remote and R2R volume control(Danzup)
  112. AC heaters question
  113. Anyone tried this Mcintosh c22 knock off.
  114. Help me to find pins for tube socket
  115. HT delay pcb...
  116. Power supply, heater questions...
  117. Heathkit AA-151, to separate pre-amp advise needed?
  118. grounding
  119. 2 Stage GM-70 amp in A2... possible?
  120. GlassWare Janus Shunt Rectifier Tube Swap
  121. Schematics
  122. SE 6B4G driver tube options?
  123. seeking datasheet of 6J2B-V in english
  124. Nailing Hum in my Phono Stage
  125. Shaving voltage off HV supply?
  126. LEAK T12 and POINT ONE - worth having ?
  127. Quicksilvers Mid Mono Schematic?
  128. Russian & East European Tube Factory Logos
  129. Lampizator Channel
  130. RIAA triode or pentode
  131. Cute Little Tube Oscilloscope, Thought I'd share.
  132. Is it really possible to deliver 2W into 40 ohms with an SET ?
  133. se
  134. Connecting Two Amps to Common Input
  135. Wiring Aikido using LSA/HPA switch
  136. Most exotic SET power amplifier
  137. Help with rogers cadet 3 integrated
  138. Opamps for servos in tube amps - Christmas gift from LT, 12-12-12!
  139. tube amp hum........normal or suggested fix?
  140. Building a beast: Stereo EL84 auto bias PP tube amp
  141. Becker Brescia auto radio
  142. Double feedback pentode Power Stage
  143. Anyone Using Guiguang 300b tubes?
  144. Where to get Audio Note Gaku-On service manual?
  145. Sanity Check - Input Transformer Overshoot
  146. TOA HA-355 vintage tube PA amp schematic
  147. EL34 PushPull UL Amp
  148. 6L6G emission too high
  149. Need help designing BIAS circuit for old Bell amp
  150. Heathkit A-5A 6L6 PP Integrated Amp
  151. Where to put the meter
  152. Radii GS-40pp
  153. Concept dilemma (pre/pwr/spud content)
  154. What to do with these Eimac tubes?
  155. Driving 211 with VT25 or EL34?
  156. DIY AMP start project - Help choosing one
  157. Pilot 248B Amp with weak channel
  158. 6H30 VA stage?
  159. What is the best way to connect DC filaments?
  160. suggestions for a parallel feed 45 amp?
  161. Counterpoint SA 5.1 repairs
  162. The Morgan Jones mini tube headphone Amplifier
  163. Borbely headphone amp
  164. Found An Amplifier In My Basement I'd Forgotten About & Learn It's Sought After
  165. Floating OPT oscilloscope measuraments
  166. I Wasn't Away That Long, What's WIth The Price Hikes On All My Old Toys?
  167. Channel voltage mismatch
  168. OS70/1750 datasheets
  169. Beautiful Chassis
  170. 6A4, 46 and 47...excellent sound tubes !!!!
  171. Is it Overkill to use Duelund Caps in Power Stage (Counterpoint SA-5.1)
  172. Quicksilver M135 Schematic?
  173. recognize this old amp?
  174. grey fogging inside 6sn7
  175. Point to point or pcb?
  176. Quad query
  177. Fixing a Velleman K4040 - Buzz HIss Crackle Blown Tubes
  178. Found Original Genalex 12AX7..Need Advice..
  179. OPT power rating and amplifier power
  180. 6BG6-GA
  181. EL84 driving EL84 SET with fixed bias
  182. P2P 6CG7 Input Buffer
  183. 865 in triode mode...anyone ever tried it?
  184. PP KT88 Amp Low frequency Ringing
  185. World audio designs kel34
  186. Glassware Audio Design
  187. 2A3 mounted horizontally
  188. from tube amp to fm reciever
  189. diy tube amp
  190. Cary 805ae xlr option
  191. ST-70 mono makeover
  192. breaking in audio capacitors
  193. Question about 6V6GT amp schematic
  194. Sherwood Schematic
  195. Ever hear of a D7L1 or D7L3 YR7 tube?
  196. Psvane Replica RCA 2A3 tube - WR2A3
  197. 845 Driver Circuit
  198. ADJUSTABLE BIAS MOD KIT
  199. Gold Lion B749 12au7 Thoughts?
  200. Siliconray SRK 09 tube amp kit help
  201. Quantum minstrel
  202. Does anyone know how John Lee Hooker recorded this? (1949)
  203. Please Identify these black capacitors.
  204. New Tubes too silent (6P15P)
  205. best sounding & value amp kits/designs?
  206. Custom Woodwork For Tube Amp
  207. Tube 2E22 in triode mode
  208. Has anyone built an OTL amp with switch mode power supplies.
  209. Altec 15067 transformers
  210. Some interesting findings with transformers
  211. Bogen KO-60 Output Iron
  212. What would you do with Scott 222D IRON?
  213. Aikido vs CCDA
  214. wiring color code
  215. Maverick Audio TubeMagic D1 DAC
  216. Is one gz34 enough
  217. Edcor OPT opinions
  218. mengyue mini/ming da el34b
  219. I need a tube buffer circuit using a 12au7
  220. Stereo Amplifier Wood Enclosure
  221. What is the theoretical advantage of direct heated triodes?
  222. 6AS6 is useful for audio ?
  223. GM-70 design approach
  224. Ultimate emotion core material ( types of silicon steel , Permalloy or Amorphous etc)
  225. Looking to build my first tube amplifier
  226. Tube/SS opamp
  227. Biasing 6CA7/EL34 in Luxman LX33
  228. John Broskie MIA again?
  229. combine filament winding for rectifier
  230. HYBRID TUBE CFP
  231. 9302 Maggie Rebuild
  232. Pyramid-IX monoblock, 200W from 4x GU-50
  233. Suggestions of phono stage to build
  234. Do power transformers affect sound quality?
  235. Help with a Velleman K4040 ...
  236. Capacitor replacement confusion
  237. RCA PA Amplifer, Input Transformers
  238. Channel imbalance Xiang Sheng DAC-01
  239. ARC M100s
  240. pros & cons of current mirror to balance a push-pull ?
  241. Wright Audio WLA10 help needed
  242. The Best tube/valve sound!?
  243. Mcintosh MC1000 and Ming Da MC300-PRE
  244. Operating Modern 845s
  245. The Transcendent Sound Son of Beast OTL Master/Mod Thread.
  246. Neutralizing An Amplifier
  247. Stacked speakers driven by an SEP amp?
  248. Tube buffer suggestion for LM4702 amplifier?
  249. FWB Voltage Doubler with -Bias supply
  250. 500V SE pentode design

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