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  1. 6146B
  2. ef86 based preamp
  3. 12FQ7 Why and will it be shortage?
  4. Trouble w/ Maida regulator bias supply
  5. impedance calculations
  6. calibrate stark 8-77?
  7. EZLoad Dummy Load
  8. Best kit for a rookie tube builder
  9. schematic question? 805 feedback
  10. 6av5ga distortion spectrum
  11. Single stage line with anode-cathode feedback
  12. VNAV' SUMO Contest 2011
  13. Direct heated triode (dht) cathode bypass: different options
  14. choice of driver for RS 241
  15. Wiring up 3 6.3 Volt Heaters to a 12V supply
  16. Adding LED's to my tubes4hifi sp6 preamp
  17. Stripped down HK A-300
  18. Westrex 2332A amplifiers
  19. Leak st20
  20. Where could I find these sockets???
  21. Hammond L-112
  22. 4-pin tube socket spring clips
  23. Quad FM1 tuner, could be in wrong section
  24. My first tube amp and speaker build I'm loven it
  25. 211 IT amp, battery vs fixed bias
  26. 300B Tube Failure
  27. how to see if a Mullard 12ax7 reissue is long or short plate
  28. Can capacitors, how do they fail?
  29. Long Preamp to Power Amp Cable Lengths
  30. My time at Hovland - HP-100 Lore
  31. hybrid quad design
  32. TooB NooB: Options?
  33. Preamp grounding
  34. Express PCB and POV-ray
  35. Looking for circuit of SE amp. for 4D32
  36. 865 tetrode in triode mode...WOW !
  37. MP-2A preamp
  38. Is a 7 watt per channel amp enough
  39. Help: Interstage Transformer for 7788 (E810F) Tube in Triode ?
  40. Transformers
  41. Pentode curves for GU 50 SE amp with 700V B+
  42. Valve op-amp pre ?
  43. Use only half of OPT secondary?
  44. On/Off cycling
  45. Tube operating points help
  46. OTL Heater Questions
  47. tube output question
  48. RIAA LCR Mythos
  49. first tube amp
  50. M135 retubing and eventual modification
  51. Taylor 211 vs. GE 211
  52. regulated
  53. What should I do with these eico hf-12's?
  54. Dynaco mk3 clone hum issue
  55. First DIY project, which SE tube amp should I build?
  56. 6n11 tube headphone amp
  57. Kt88 Pin alignement problem=did a mistake
  58. LTspice Frustration...help, please..
  59. Bias mods
  60. Maida tracking preregulator?
  61. 230 VAC to 2*140 VAC transformer - 20VA
  62. Re gettering?
  63. Distortion rise on OPT
  64. How to build a transconductance tester for small driver tubes?
  65. Musical Fidelity X-10D Cap Mod
  66. 6N3 & 6E2 tubes.
  67. help with local nfb
  68. What should I build
  69. leak st20
  70. Wright Audio WPA 3.5 Humpot & schematics
  71. the old light bulb trick
  72. Dynaco ST70 KIT - your opinion please
  73. Wire for tubes using a plate cap?
  74. Lundahl LL1660 OPT Franks 6SN7 linestage
  75. GU-50 PP + 10k:16-8-4 Ohm ,20w OPT..what is the best to do?
  76. Tomiko 10k PP transformer?
  77. Powerdrive for higher grid wattage A2 transmitter tubes
  78. Marantz Model 5 Amps and Model Seven Preamp
  79. How to calculate output transformers
  80. Grounding considerations with external PS
  81. Cathodyne fet buffered balanced line out
  82. 807pp + input phase splitter
  83. leak st 20
  84. Does anyone know what this is!..???
  85. Thought Exercise: Submini Circlotron OTL Amp
  86. Preamp Grounding PCB
  87. Manley 440: Tubes red cherry after replacing old tubes with new ones
  88. EL95 Parallel Push Pull design
  89. What is the ideal low-noise heater power for high-power output tubes?
  90. Beijing 6N6T
  91. Tube recomedations for my first tube amp
  92. Tube Load Lines and B+
  93. Hybrid rectifier possible in PSUD?
  94. Hickok calibration
  95. Bias voltage slower to come up
  96. Can You Reccommend a 6922 tube?
  97. Miniblok Resistor Parameter Modulation using Pots
  98. gm70 driver tube tests
  99. 300B Globe physical dimensions
  100. DIY Fisher 800b into a mic pre
  101. OPT Modification Question-Help please?
  102. Cant find origin
  103. Fixing Sneaky Oscillation in P-P Amplifiers
  104. fu-29 Audioromy
  105. Almarro A205A as experimentation platform
  106. Thoughts on layout and potential for improvements
  107. What is the difference between "rectifier tubes" and "power tubes"
  108. uTracer...
  109. EL84/UL84 single valve amp
  110. Mic preamp - strange high frequency roll off problem
  111. Tissbury audio
  112. midification to srpp preamplifier input voltage
  113. DHT SE amp with ultrapath
  114. Tube mic preamp problem
  115. Output transformer: reasons for destruction?
  116. Bewitch KT88
  117. SE OPT Wiring
  118. Budget 300b tubes recommendations
  119. Hum problem through one channel
  120. Audio Research LS22 DIY
  121. 300V Tube Power Supply From 120VAC Without Rectifier?
  122. NOS Tube: Black Spot on Getter Flashing? Help
  123. FET Source Follower Distortion
  124. TUBE/MOSFET/BJT hibrid amp
  125. PYE Black Box amplifier
  126. Tube tester
  127. what OPT for 211 parallel SE amp?
  128. Opinions for 6550 bias.
  129. 832A as a Single Ended Tetrode Amp?
  130. DCPP - "Engineer's Amplifier" : Need a bit of help
  131. quicky rebuild 6v6 to 807
  132. Old fire bottles.
  133. Regulated Power Supply using 6550
  134. GU50 SE vs 300B SE tube amp??
  135. Help with voltages
  136. New to valves & this forum.
  137. new amp 2a3 pp
  138. Telefunken EL153 SE circuity
  139. RH 84 Variation: Direct Coupled Pentode
  140. Single Transformer, two valve rectifiers
  141. Capacitors for Radio Frequency Amlifier and Converter Oscillator Tubes
  142. Tube Screening Cans
  143. PSU grounding
  144. 6AX4GT TV damper
  145. plate on chinese 6L6 red on one side
  146. FM stereo decoder
  147. Under the Christmas Tree - Valve Amplifiers 4th Ed.
  148. Using those dern 1625 tubes: a simple SEP amplifier
  149. Pairs of resistors in opposite directions
  150. 45 spice model
  151. APEX 460 Tube mic modification
  152. EL84 and 6BQ5 are Same?
  153. Simple hybrid amplifier (35W/8Ohm)
  154. Yaqin mc 10l or qinpu 6000 mkii
  155. Reported attack site?
  156. LCR RIAA Phono with DHTs
  157. New Here -Would Like to Build
  158. 12E1 push pull poweramp
  159. marantz model 9
  160. I would appreciate some helpfull advice from Aikido builders
  161. Dynaco ST70 big Snorting noise.
  162. Good Soft Distortion
  163. magnavox 8301 revamp, need's a second look
  164. Circuit or schematic for current source of 7.5mA
  165. Sakuma's bleeder tubes and series connected transfomers
  166. Tube measurement
  167. adding tone control to SE 6v6 amp
  168. Easy Little 6L6 SE
  169. knight KA-55
  170. Hum in tube amp
  171. Lundahl LL1660 10 mA Alt V
  172. 12au7 valve preamp (again?)
  173. Simple DC heating question
  174. 6146B?
  175. Reduce gain on power amp?
  176. ES9023 DAC(subbu) + Tube Preamp with Remote and R2R volume control(Danzup)
  177. AC heaters question
  178. Anyone tried this Mcintosh c22 knock off.
  179. Help me to find pins for tube socket
  180. HT delay pcb...
  181. Power supply, heater questions...
  182. Heathkit AA-151, to separate pre-amp advise needed?
  183. grounding
  184. 2 Stage GM-70 amp in A2... possible?
  185. GlassWare Janus Shunt Rectifier Tube Swap
  186. Schematics
  187. SE 6B4G driver tube options?
  188. seeking datasheet of 6J2B-V in english
  189. Nailing Hum in my Phono Stage
  190. Shaving voltage off HV supply?
  191. LEAK T12 and POINT ONE - worth having ?
  192. Quicksilvers Mid Mono Schematic?
  193. Russian & East European Tube Factory Logos
  194. Lampizator Channel
  195. RIAA triode or pentode
  196. Cute Little Tube Oscilloscope, Thought I'd share.
  197. Is it really possible to deliver 2W into 40 ohms with an SET ?
  198. se
  199. Connecting Two Amps to Common Input
  200. Wiring Aikido using LSA/HPA switch
  201. Most exotic SET power amplifier
  202. Help with rogers cadet 3 integrated
  203. Opamps for servos in tube amps - Christmas gift from LT, 12-12-12!
  204. tube amp hum........normal or suggested fix?
  205. Building a beast: Stereo EL84 auto bias PP tube amp
  206. Becker Brescia auto radio
  207. Double feedback pentode Power Stage
  208. Anyone Using Guiguang 300b tubes?
  209. Where to get Audio Note Gaku-On service manual?
  210. Sanity Check - Input Transformer Overshoot
  211. TOA HA-355 vintage tube PA amp schematic
  212. EL34 PushPull UL Amp
  213. 6L6G emission too high
  214. Need help designing BIAS circuit for old Bell amp
  215. Heathkit A-5A 6L6 PP Integrated Amp
  216. Where to put the meter
  217. Radii GS-40pp
  218. Concept dilemma (pre/pwr/spud content)
  219. What to do with these Eimac tubes?
  220. Driving 211 with VT25 or EL34?
  221. DIY AMP start project - Help choosing one
  222. Pilot 248B Amp with weak channel
  223. 6H30 VA stage?
  224. What is the best way to connect DC filaments?
  225. suggestions for a parallel feed 45 amp?
  226. Counterpoint SA 5.1 repairs
  227. The Morgan Jones mini tube headphone Amplifier
  228. Borbely headphone amp
  229. Found An Amplifier In My Basement I'd Forgotten About & Learn It's Sought After
  230. Floating OPT oscilloscope measuraments
  231. I Wasn't Away That Long, What's WIth The Price Hikes On All My Old Toys?
  232. Channel voltage mismatch
  233. OS70/1750 datasheets
  234. Beautiful Chassis
  235. 6A4, 46 and 47...excellent sound tubes !!!!
  236. Is it Overkill to use Duelund Caps in Power Stage (Counterpoint SA-5.1)
  237. Quicksilver M135 Schematic?
  238. recognize this old amp?
  239. grey fogging inside 6sn7
  240. Point to point or pcb?
  241. Quad query
  242. Fixing a Velleman K4040 - Buzz HIss Crackle Blown Tubes
  243. Found Original Genalex 12AX7..Need Advice..
  244. OPT power rating and amplifier power
  245. 6BG6-GA
  246. EL84 driving EL84 SET with fixed bias
  247. P2P 6CG7 Input Buffer
  248. 865 in triode mode...anyone ever tried it?
  249. PP KT88 Amp Low frequency Ringing
  250. World audio designs kel34

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