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  1. Picking an output transformer: power vs. sound quality
  2. Tube emulation with transistors
  3. Altec 1570b Tube Swap
  4. Popping stepped attenuator
  5. 6922 driver/cathodyne - direct coupled
  6. Solid state rectifier with these tubes
  7. Need advice -- Improving an old tube amp
  8. KT88 SE developed a buzz
  9. Guidance on amp design
  10. OTL3 Autograph Series
  11. DAC Tube i/v help!
  12. Need help figuring out a tube amp!
  13. Parallel 12AT7 output stage design?
  14. 6SN7 SRPP
  15. Problem Bi-Amping
  16. Amplifier recommendation
  17. DIY tube amplifier got no sound but all tubes are fired up.
  18. Circuit for Melos 333
  19. DHT Tube regulated power supply
  20. Akai M8 Restoration, newbie questions
  21. Bench Power Supply - what to get?
  22. Telefunken RS241 Design Help
  23. Telefunken Hymnus 5328 MX console
  24. Some Dummy DHT Questions
  25. Inductance loading tube stage questions
  26. Simple tube kit for tube sound ?
  27. Voltage Divider with Capacitor Across Resistor to Ground
  28. FM Demodulator for Tube receivers
  29. The best amp to DIY?
  30. SE Tubelab / EL34b tubes / Transformers
  31. Heath Kit Pre Amp
  32. Preamp hiss noise
  33. Tube preamp?
  34. 417a load line
  35. 6N1 + 6P3P build, need some help.
  36. Caps connected in series in Audio Note kit 4
  37. Ground loop cure?
  38. Dynaco ST-70 Clone
  39. Op Amp Phase Splitter
  40. Idea for ECC85 or EM84?
  41. Why no sound?
  42. single ended tube amp sounds itself
  43. Proper Pentode Usage 717A (713A)
  44. Help with Mullard 5 20 project
  45. Help on Negative Feedback in KT66 PP
  46. Trying to understand 6BM8 regulator (audio note clone)
  47. 6AS7 headphone amp with Sophia Electric Mesh plate 274B rec. tube
  48. CR Kalypso Amp with output stage problem- Please help!
  49. "PEAK INPUT SIGNAL GRID-TO-GRID" question.
  50. EZ81 Load
  51. Rectifier question
  52. 6sn7-300b
  53. Balanced tube phono stage
  54. Your favorite 12B4A for a preamp ?
  55. Voltage rating for output coupling caps in 6J1 tube buffer?
  56. Single stage 845 amp
  57. Eagle tube library
  58. Using Choke in Choke Input Power Supply ?
  59. 6550 wrong high bias...
  60. Floating Bridged CCS Loaded P-P Tube Amp
  61. What to do with a problem Counterpoint SA-12
  62. 6Z9P Mu Stage max anode-cathode voltage
  63. Audio Innovations Series 500 parts
  64. Hagerman Trumpet phonostage
  65. PS design...success or failure?
  66. Kuba Serenade Stereo Console - Part III - Replacing all caps
  67. schematic of Knight KP-70 preamp or anyone having this amp?
  68. 6N6P Cathode Follower design value
  69. Radiotron 32W PP amp from RDH3
  70. Heater filament questions
  71. 46 in ultralinear mode
  72. help needed need transformer prim 230/110 sec 300v appr. 20ma +6,3v or 12,6v
  73. Output transformer confusion
  74. need amp schematic help
  75. lm317 and heater supply.
  76. BJT Voltage Bootstrap - SLCF
  77. Ideas for a cheap 200mA tube rectified PSU
  78. Need help with tube rectifier
  79. Tube or Circuit Noise?
  80. JE Labs (Angela instr.) : your favorite 2A3 schematic ?
  81. Crack the Code Amp build 1000 Watt Tube Amplifier
  82. 12E1 in fixed bias - too much current!
  83. CD-DVD player vs Notebook-usb soundcard sensitivity issue
  84. photo of Knight KP-70 preamplifier for missing component
  85. heater wear sign?
  86. Musical Fidelty X-10D Clone
  87. 815 amp
  88. Jorgen Schou 31,5 OT connection
  89. Is there such a thing....
  90. Tube Rectifiers and Common Grounds
  91. vt4c.com copper tube socket mounts
  92. 1 Ohm Tap Output tranformers?
  93. Voltage Specs For Heaters-Is 2.4V Good Enough?
  94. Aikido with 5842
  95. Luxman MQ70
  96. Valve pre-amp schematic help needed
  97. valves' world - tossie Japan
  98. 211 amp , recognize the circuit?
  99. Tube Preamp: Remedy For Digital Glare?
  100. Tubelab SSE without tube rectifier
  101. Counterpoint 7A
  102. Low Z Out Dual Triode
  103. Push Pull circuit - controlling sensitivity
  104. Moto 3 channel to Maggy 175
  105. PMillett Landfall heatsink
  106. lower the gain
  107. KT88?
  108. Sphinx Project Fourteen help wanted
  109. will this work and looking for suggestions
  110. Squeal on shutdown
  111. Newbie to SRPP and Tubes , 1 question.
  112. Question about interconnect transformers
  113. another toy - el84 PP class A
  114. Problem with biasing - no voltage drop on a cathode resistor
  115. EL84 PP current fluctuating
  116. Aikido Preamp Questions (again)
  117. Amp caused crack
  118. OPT performances
  119. Hammond 125ESE in 2A3 SE : better substitutions ?
  120. Headphone Impedance and headphone amplifier
  121. Could this tube be good for audio ?
  122. Output Transformer for SE / headphone amp
  123. pioneer sm-b200a
  124. 12AT7 Tubes ?
  125. Gold Lion kt77 bias help?
  126. Need some bias control help
  127. Lafayette LA-224a/b modernization?
  128. Need help completing vintage 6L6 amp
  129. Direct Russian equivilent for 5687, is there one ?
  130. Attenuation for 0.5dBs
  131. Dynaco ST-120 Impedance Concern Martin Logan
  132. Some 1626 Darling Amp Questions
  133. Choosing a SE 2A3 shematic : hum as a criteria...
  134. Rectifier question, voltage across diode.
  135. Angela simple 2A3
  136. Cathode follower - resistor calculations/software
  137. Desperately Seeking OPT Covers
  138. Modified Tube Cricket Amp Questions
  139. Best sounding DIY amp kits for 45, 2A3 or 300B
  140. Pentode's screen voltage/current
  141. KT88 Cathode Current Runaway/Oscillations?
  142. O'netics, Electra Print: anyone have both?
  143. How to maximize power transfer in tube circuit designs, damping is not the question!
  144. Inexpensive 2.5k primary SET OPT with 90mA+ DC bias rating?
  145. 4p1L Ultralinear
  146. RH300B 12W with 1% THD
  147. This is where the adventure begins
  148. 12AU7 pre rebuild suggestions
  149. Subwoofer Channel on Tube Amp
  150. Changing input tube from 12ax7 to 6AU6A on OTL project
  151. Yaqin MC5881a
  152. Humming Sound from tube amp
  153. Level Five 2A3 SE schematic : opinions ?
  154. My screwup = free PCBs...
  155. New stuff on the website: A2 buffer, isolated current sensor
  156. 12.6vDC Heaters, looking for a shortcut
  157. Fisher 80-AZ bias milliamps?
  158. Can shed some light on this EL 34 schematic diagram
  159. Solid State Rectifier in Dynaco Tube Amp
  160. Big chassis designs!
  161. 12ax7 LP
  162. plitron output w/ cfb usage ideas
  163. 390 ohm should have been 390k ohm
  164. Advice sought re what tube power amp
  165. EL34 SED Winged C Black Prints: original??
  166. OPTx from Ogonowski
  167. Aikido cathode follower (ACF) with 12au7
  168. SEP EL-34 to 6L6GC?
  169. Volume Pot Spec
  170. My Tube Pre-Amp Picking up an AM radio station?
  171. Philips 6SN7 GTA & GTB
  172. ST-120 Problem With Rectifier Tube
  173. New Yaqin VK-2100
  174. Electronic parts and sub-zero temperature
  175. Bendix 6384 as EL34: Experience anyone?
  176. Audioresearch LS2B schematic needed
  177. input noise - too simple - but need explaination
  178. Plate voltage with/without tube (for fine tune bias adjustemnt)
  179. Using trimmers / potentiometers to adjust tube operating points
  180. KT88 SED winged C tolerance tall for quad
  181. Power Transformer Tolerances
  182. 12E1 Ultra Linear
  183. Comparison KT150 versus KT120
  184. 6sn7: GT GTA GTB sono differences for HIFI
  185. Audio Research LS5 Power Supply Problem
  186. Vintage grundig vs. new Yaqin. Advice?
  187. 5AR4 PSU
  188. What tube is this ?
  189. Need Schematic
  190. Budget PP Iron: Transcendar or Edcor?
  191. Yaqin MC-10L buzz
  192. Transformer buzzing when filament section is loaded
  193. Grid Stopper v Grid Leak on el84
  194. 2.5V Heater Tranformer-Best to Use One Per Channel?
  195. Amp: KT88 push-pull shunt feedback output via p-channel fet
  196. My biggest fear....
  197. I've made an awful mess...
  198. Any input for a tube noob's first attempt? Flea Watt 12b4, 6dj8, low B+
  199. HV scope use
  200. Kolster-Brandes er30
  201. Buzz that goes away when input grounded.
  202. Hovland HP-100 tube replacement
  203. Dynaco ST-120 Turn On Pop or Problem
  204. Grounding two channel preamp sharing a psu.
  205. Convert hybrid amp to pure tube output?
  206. Please Help me with this tubes
  207. resistor maximum voltage rating
  208. 211- 6e5p full amp. The first setps
  209. E810F and general pentodes design question
  210. Pop goes the bias cap.
  211. High Power Single Ended Triode, Design
  212. Yaqin MS-6V6 vs. Markhill MS-6V6
  213. Schematic please: Luxman MQ-70?
  214. Aikido tube preamp with Tortuga LDR volume control
  215. Type 37 tube preamp
  216. Figuring out a KT88 datasheet?
  217. Power supply 260V for tube preamp
  218. Aikido Tube with Tortuga volume control project
  219. Adding a pre out to amp
  220. One or two ECC82 for two channels (crosstalk)!
  221. Red Pilot (240)
  222. 77:1 Output Transformer Question
  223. Power transformer recommendation Kt88 SE and JE labs Riaa
  224. Tube output power for OPT calculation
  225. 6sn7 tube anode folower question?????
  226. Goldox 9300
  227. good quality/sounding preamp advice
  228. PL84 schematic question.
  229. YouTube Video: 12AX7 comparisons.
  230. How many volts ???
  231. Greetings all/ (newbie) Need Advice!
  232. Psud and Single Ended Amplifier
  233. Socket Combiniations
  234. From Potentiometer to Stepped Attenuator
  235. No need for bleed resistors on Fisher 90-T
  236. Sophia 300B+ carbon
  237. PL519 amp SE
  238. C3g Headphone design - will this work?
  239. Luxman 2A3 amp SE
  240. Capacitor on Aikido Power Supply Sampling Circuit
  241. Well, what have I done now?
  242. Aikido CF cathode resistor?
  243. D3A - 6P45S/El519 SE "The staircase" my first h-end amplifier.
  244. SET Cathode Biased vs. Fixed Bias?
  245. JAN6418 pre-amp advise
  246. SOHA II amp tripping
  247. 6JN6 LTspice model?
  248. unusual output transformers, what are they for?
  249. Cheap power amp kit with 6N2 + 6P3
  250. KT88 AMP I'm not sure about power supply

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