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  1. Use only half of OPT secondary?
  2. On/Off cycling
  3. Tube operating points help
  4. OTL Heater Questions
  5. tube output question
  6. RIAA LCR Mythos
  7. first tube amp
  8. M135 retubing and eventual modification
  9. Taylor 211 vs. GE 211
  10. regulated
  11. What should I do with these eico hf-12's?
  12. Dynaco mk3 clone hum issue
  13. First DIY project, which SE tube amp should I build?
  14. 6n11 tube headphone amp
  15. Kt88 Pin alignement problem=did a mistake
  16. LTspice Frustration...help, please..
  17. Bias mods
  18. Maida tracking preregulator?
  19. 230 VAC to 2*140 VAC transformer - 20VA
  20. Re gettering?
  21. Distortion rise on OPT
  22. How to build a transconductance tester for small driver tubes?
  23. Musical Fidelity X-10D Cap Mod
  24. 6N3 & 6E2 tubes.
  25. help with local nfb
  26. What should I build
  27. leak st20
  28. Wright Audio WPA 3.5 Humpot & schematics
  29. the old light bulb trick
  30. Dynaco ST70 KIT - your opinion please
  31. Wire for tubes using a plate cap?
  32. Lundahl LL1660 OPT Franks 6SN7 linestage
  33. GU-50 PP + 10k:16-8-4 Ohm ,20w OPT..what is the best to do?
  34. Tomiko 10k PP transformer?
  35. Powerdrive for higher grid wattage A2 transmitter tubes
  36. Marantz Model 5 Amps and Model Seven Preamp
  37. How to calculate output transformers
  38. Grounding considerations with external PS
  39. Cathodyne fet buffered balanced line out
  40. 807pp + input phase splitter
  41. leak st 20
  42. Questions about Champ mods, NF loop and more
  43. Does anyone know what this is!..???
  44. Thought Exercise: Submini Circlotron OTL Amp
  45. Preamp Grounding PCB
  46. Manley 440: Tubes red cherry after replacing old tubes with new ones
  47. EL95 Parallel Push Pull design
  48. What is the ideal low-noise heater power for high-power output tubes?
  49. Beijing 6N6T
  50. Tube recomedations for my first tube amp
  51. Tube Load Lines and B+
  52. Hybrid rectifier possible in PSUD?
  53. Hickok calibration
  54. Bias voltage slower to come up
  55. Can You Reccommend a 6922 tube?
  56. Miniblok Resistor Parameter Modulation using Pots
  57. gm70 driver tube tests
  58. 300B Globe physical dimensions
  59. DIY Fisher 800b into a mic pre
  60. OPT Modification Question-Help please?
  61. Cant find origin
  62. Fixing Sneaky Oscillation in P-P Amplifiers
  63. fu-29 Audioromy
  64. Almarro A205A as experimentation platform
  65. Thoughts on layout and potential for improvements
  66. What is the difference between "rectifier tubes" and "power tubes"
  67. uTracer...
  68. EL84/UL84 single valve amp
  69. Mic preamp - strange high frequency roll off problem
  70. Tissbury audio
  71. midification to srpp preamplifier input voltage
  72. DHT SE amp with ultrapath
  73. Tube mic preamp problem
  74. Output transformer: reasons for destruction?
  75. Bewitch KT88
  76. SE OPT Wiring
  77. maggie 185 to stereo guitar amp?
  78. Budget 300b tubes recommendations
  79. Hum problem through one channel
  80. Audio Research LS22 DIY
  81. 300V Tube Power Supply From 120VAC Without Rectifier?
  82. NOS Tube: Black Spot on Getter Flashing? Help
  83. FET Source Follower Distortion
  84. TUBE/MOSFET/BJT hibrid amp
  85. PYE Black Box amplifier
  86. Tube tester
  87. what OPT for 211 parallel SE amp?
  88. Opinions for 6550 bias.
  89. 832A as a Single Ended Tetrode Amp?
  90. DCPP - "Engineer's Amplifier" : Need a bit of help
  91. quicky rebuild 6v6 to 807
  92. Old fire bottles.
  93. Regulated Power Supply using 6550
  94. GU50 SE vs 300B SE tube amp??
  95. Help with voltages
  96. New to valves & this forum.
  97. new amp 2a3 pp
  98. Telefunken EL153 SE circuity
  99. RH 84 Variation: Direct Coupled Pentode
  100. Single Transformer, two valve rectifiers
  101. Capacitors for Radio Frequency Amlifier and Converter Oscillator Tubes
  102. Tube Screening Cans
  103. PSU grounding
  104. 6AX4GT TV damper
  105. plate on chinese 6L6 red on one side
  106. FM stereo decoder
  107. Under the Christmas Tree - Valve Amplifiers 4th Ed.
  108. Using those dern 1625 tubes: a simple SEP amplifier
  109. Pairs of resistors in opposite directions
  110. 45 spice model
  111. APEX 460 Tube mic modification
  112. EL84 and 6BQ5 are Same?
  113. Simple hybrid amplifier (35W/8Ohm)
  114. Yaqin mc 10l or qinpu 6000 mkii
  115. Reported attack site?
  116. LCR RIAA Phono with DHTs
  117. New Here -Would Like to Build
  118. 12E1 push pull poweramp
  119. marantz model 9
  120. I would appreciate some helpfull advice from Aikido builders
  121. Dynaco ST70 big Snorting noise.
  122. Good Soft Distortion
  123. magnavox 8301 revamp, need's a second look
  124. Circuit or schematic for current source of 7.5mA
  125. Sakuma's bleeder tubes and series connected transfomers
  126. Tube measurement
  127. adding tone control to SE 6v6 amp
  128. Easy Little 6L6 SE
  129. knight KA-55
  130. Hum in tube amp
  131. Lundahl LL1660 10 mA Alt V
  132. 12au7 valve preamp (again?)
  133. Simple DC heating question
  134. 6146B?
  135. Reduce gain on power amp?
  136. ES9023 DAC(subbu) + Tube Preamp with Remote and R2R volume control(Danzup)
  137. AC heaters question
  138. Anyone tried this Mcintosh c22 knock off.
  139. Help me to find pins for tube socket
  140. HT delay pcb...
  141. Power supply, heater questions...
  142. Heathkit AA-151, to separate pre-amp advise needed?
  143. grounding
  144. 2 Stage GM-70 amp in A2... possible?
  145. GlassWare Janus Shunt Rectifier Tube Swap
  146. Schematics
  147. SE 6B4G driver tube options?
  148. seeking datasheet of 6J2B-V in english
  149. Nailing Hum in my Phono Stage
  150. Shaving voltage off HV supply?
  151. LEAK T12 and POINT ONE - worth having ?
  152. Quicksilvers Mid Mono Schematic?
  153. Russian & East European Tube Factory Logos
  154. Lampizator Channel
  155. RIAA triode or pentode
  156. Cute Little Tube Oscilloscope, Thought I'd share.
  157. Is it really possible to deliver 2W into 40 ohms with an SET ?
  158. se
  159. Connecting Two Amps to Common Input
  160. Wiring Aikido using LSA/HPA switch
  161. Most exotic SET power amplifier
  162. Help with rogers cadet 3 integrated
  163. Opamps for servos in tube amps - Christmas gift from LT, 12-12-12!
  164. tube amp hum........normal or suggested fix?
  165. Building a beast: Stereo EL84 auto bias PP tube amp
  166. Becker Brescia auto radio
  167. Double feedback pentode Power Stage
  168. Anyone Using Guiguang 300b tubes?
  169. Where to get Audio Note Gaku-On service manual?
  170. Sanity Check - Input Transformer Overshoot
  171. TOA HA-355 vintage tube PA amp schematic
  172. EL34 PushPull UL Amp
  173. 6L6G emission too high
  174. Need help designing BIAS circuit for old Bell amp
  175. Heathkit A-5A 6L6 PP Integrated Amp
  176. Where to put the meter
  177. Radii GS-40pp
  178. Concept dilemma (pre/pwr/spud content)
  179. What to do with these Eimac tubes?
  180. Driving 211 with VT25 or EL34?
  181. DIY AMP start project - Help choosing one
  182. Pilot 248B Amp with weak channel
  183. 6H30 VA stage?
  184. What is the best way to connect DC filaments?
  185. suggestions for a parallel feed 45 amp?
  186. Counterpoint SA 5.1 repairs
  187. The Morgan Jones mini tube headphone Amplifier
  188. Borbely headphone amp
  189. Found An Amplifier In My Basement I'd Forgotten About & Learn It's Sought After
  190. Floating OPT oscilloscope measuraments
  191. I Wasn't Away That Long, What's WIth The Price Hikes On All My Old Toys?
  192. Channel voltage mismatch
  193. OS70/1750 datasheets
  194. Beautiful Chassis
  195. 6A4, 46 and 47...excellent sound tubes !!!!
  196. Is it Overkill to use Duelund Caps in Power Stage (Counterpoint SA-5.1)
  197. Quicksilver M135 Schematic?
  198. recognize this old amp?
  199. grey fogging inside 6sn7
  200. Point to point or pcb?
  201. Quad query
  202. Fixing a Velleman K4040 - Buzz HIss Crackle Blown Tubes
  203. Found Original Genalex 12AX7..Need Advice..
  204. OPT power rating and amplifier power
  205. 6BG6-GA
  206. EL84 driving EL84 SET with fixed bias
  207. P2P 6CG7 Input Buffer
  208. 865 in triode mode...anyone ever tried it?
  209. PP KT88 Amp Low frequency Ringing
  210. World audio designs kel34
  211. Glassware Audio Design
  212. 2A3 mounted horizontally
  213. from tube amp to fm reciever
  214. diy tube amp
  215. Cary 805ae xlr option
  216. ST-70 mono makeover
  217. breaking in audio capacitors
  218. Question about 6V6GT amp schematic
  219. Sherwood Schematic
  220. Ever hear of a D7L1 or D7L3 YR7 tube?
  221. Psvane Replica RCA 2A3 tube - WR2A3
  222. 845 Driver Circuit
  223. ADJUSTABLE BIAS MOD KIT
  224. Gold Lion B749 12au7 Thoughts?
  225. Siliconray SRK 09 tube amp kit help
  226. Quantum minstrel
  227. Does anyone know how John Lee Hooker recorded this? (1949)
  228. Please Identify these black capacitors.
  229. New Tubes too silent (6P15P)
  230. best sounding & value amp kits/designs?
  231. Custom Woodwork For Tube Amp
  232. Tube 2E22 in triode mode
  233. Has anyone built an OTL amp with switch mode power supplies.
  234. Altec 15067 transformers
  235. Some interesting findings with transformers
  236. Bogen KO-60 Output Iron
  237. What would you do with Scott 222D IRON?
  238. Aikido vs CCDA
  239. wiring color code
  240. Maverick Audio TubeMagic D1 DAC
  241. Is one gz34 enough
  242. Edcor OPT opinions
  243. mengyue mini/ming da el34b
  244. I need a tube buffer circuit using a 12au7
  245. Stereo Amplifier Wood Enclosure
  246. What is the theoretical advantage of direct heated triodes?
  247. 6AS6 is useful for audio ?
  248. GM-70 design approach
  249. Ultimate emotion core material ( types of silicon steel , Permalloy or Amorphous etc)
  250. Looking to build my first tube amplifier

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