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  1. Edcor GXPP vs. CXPP
  2. Shorting or Non-Shorting Rotary Switch: Hi-Low Z tube headphone amp
  3. Marshall Guitar Conversion 12AX7 Replacement
  4. affordable potted power transformer?
  5. Am I pushing the envelope too far? Layout concerns.
  6. Pete Millet's Uniamp
  7. 6211 for???
  8. Picking an output transformer: power vs. sound quality
  9. Tube emulation with transistors
  10. Altec 1570b Tube Swap
  11. Popping stepped attenuator
  12. 6922 driver/cathodyne - direct coupled
  13. Solid state rectifier with these tubes
  14. Need advice -- Improving an old tube amp
  15. KT88 SE developed a buzz
  16. Guidance on amp design
  17. OTL3 Autograph Series
  18. DAC Tube i/v help!
  19. Need help figuring out a tube amp!
  20. Parallel 12AT7 output stage design?
  21. 6SN7 SRPP
  22. Problem Bi-Amping
  23. Amplifier recommendation
  24. DIY tube amplifier got no sound but all tubes are fired up.
  25. Circuit for Melos 333
  26. DHT Tube regulated power supply
  27. Akai M8 Restoration, newbie questions
  28. Bench Power Supply - what to get?
  29. Telefunken RS241 Design Help
  30. Telefunken Hymnus 5328 MX console
  31. Some Dummy DHT Questions
  32. Inductance loading tube stage questions
  33. Simple tube kit for tube sound ?
  34. Voltage Divider with Capacitor Across Resistor to Ground
  35. FM Demodulator for Tube receivers
  36. The best amp to DIY?
  37. SE Tubelab / EL34b tubes / Transformers
  38. Heath Kit Pre Amp
  39. Preamp hiss noise
  40. Tube preamp?
  41. 417a load line
  42. 6N1 + 6P3P build, need some help.
  43. Caps connected in series in Audio Note kit 4
  44. Ground loop cure?
  45. Dynaco ST-70 Clone
  46. Op Amp Phase Splitter
  47. Idea for ECC85 or EM84?
  48. Why no sound?
  49. single ended tube amp sounds itself
  50. Proper Pentode Usage 717A (713A)
  51. Help with Mullard 5 20 project
  52. Help on Negative Feedback in KT66 PP
  53. Trying to understand 6BM8 regulator (audio note clone)
  54. 6AS7 headphone amp with Sophia Electric Mesh plate 274B rec. tube
  55. CR Kalypso Amp with output stage problem- Please help!
  56. "PEAK INPUT SIGNAL GRID-TO-GRID" question.
  57. EZ81 Load
  58. Rectifier question
  59. 6sn7-300b
  60. Balanced tube phono stage
  61. Your favorite 12B4A for a preamp ?
  62. Voltage rating for output coupling caps in 6J1 tube buffer?
  63. Single stage 845 amp
  64. Eagle tube library
  65. Using Choke in Choke Input Power Supply ?
  66. 6550 wrong high bias...
  67. Floating Bridged CCS Loaded P-P Tube Amp
  68. What to do with a problem Counterpoint SA-12
  69. 6Z9P Mu Stage max anode-cathode voltage
  70. Audio Innovations Series 500 parts
  71. Hagerman Trumpet phonostage
  72. PS design...success or failure?
  73. Kuba Serenade Stereo Console - Part III - Replacing all caps
  74. schematic of Knight KP-70 preamp or anyone having this amp?
  75. 6N6P Cathode Follower design value
  76. Radiotron 32W PP amp from RDH3
  77. Heater filament questions
  78. 46 in ultralinear mode
  79. help needed need transformer prim 230/110 sec 300v appr. 20ma +6,3v or 12,6v
  80. Output transformer confusion
  81. need amp schematic help
  82. reviving an old Randall RGT100
  83. lm317 and heater supply.
  84. BJT Voltage Bootstrap - SLCF
  85. Ideas for a cheap 200mA tube rectified PSU
  86. Need help with tube rectifier
  87. Tube or Circuit Noise?
  88. JE Labs (Angela instr.) : your favorite 2A3 schematic ?
  89. Crack the Code Amp build 1000 Watt Tube Amplifier
  90. 12E1 in fixed bias - too much current!
  91. CD-DVD player vs Notebook-usb soundcard sensitivity issue
  92. photo of Knight KP-70 preamplifier for missing component
  93. heater wear sign?
  94. Musical Fidelty X-10D Clone
  95. 815 amp
  96. Jorgen Schou 31,5 OT connection
  97. Is there such a thing....
  98. Tube Rectifiers and Common Grounds
  99. vt4c.com copper tube socket mounts
  100. 1 Ohm Tap Output tranformers?
  101. Voltage Specs For Heaters-Is 2.4V Good Enough?
  102. Aikido with 5842
  103. Luxman MQ70
  104. Valve pre-amp schematic help needed
  105. valves' world - tossie Japan
  106. 211 amp , recognize the circuit?
  107. Tube Preamp: Remedy For Digital Glare?
  108. Tubelab SSE without tube rectifier
  109. Counterpoint 7A
  110. Low Z Out Dual Triode
  111. Push Pull circuit - controlling sensitivity
  112. Moto 3 channel to Maggy 175
  113. PMillett Landfall heatsink
  114. lower the gain
  115. KT88?
  116. Sphinx Project Fourteen help wanted
  117. will this work and looking for suggestions
  118. Squeal on shutdown
  119. Newbie to SRPP and Tubes , 1 question.
  120. Question about interconnect transformers
  121. another toy - el84 PP class A
  122. Problem with biasing - no voltage drop on a cathode resistor
  123. EL84 PP current fluctuating
  124. Aikido Preamp Questions (again)
  125. Amp caused crack
  126. OPT performances
  127. Hammond 125ESE in 2A3 SE : better substitutions ?
  128. Headphone Impedance and headphone amplifier
  129. Could this tube be good for audio ?
  130. Output Transformer for SE / headphone amp
  131. pioneer sm-b200a
  132. 12AT7 Tubes ?
  133. Gold Lion kt77 bias help?
  134. Need some bias control help
  135. Lafayette LA-224a/b modernization?
  136. Need help completing vintage 6L6 amp
  137. Direct Russian equivilent for 5687, is there one ?
  138. Attenuation for 0.5dBs
  139. Dynaco ST-120 Impedance Concern Martin Logan
  140. Some 1626 Darling Amp Questions
  141. Choosing a SE 2A3 shematic : hum as a criteria...
  142. Rectifier question, voltage across diode.
  143. Angela simple 2A3
  144. Cathode follower - resistor calculations/software
  145. Desperately Seeking OPT Covers
  146. Modified Tube Cricket Amp Questions
  147. Best sounding DIY amp kits for 45, 2A3 or 300B
  148. Pentode's screen voltage/current
  149. KT88 Cathode Current Runaway/Oscillations?
  150. O'netics, Electra Print: anyone have both?
  151. How to maximize power transfer in tube circuit designs, damping is not the question!
  152. Inexpensive 2.5k primary SET OPT with 90mA+ DC bias rating?
  153. 4p1L Ultralinear
  154. RH300B 12W with 1% THD
  155. This is where the adventure begins
  156. 12AU7 pre rebuild suggestions
  157. Subwoofer Channel on Tube Amp
  158. Changing input tube from 12ax7 to 6AU6A on OTL project
  159. Yaqin MC5881a
  160. Humming Sound from tube amp
  161. Level Five 2A3 SE schematic : opinions ?
  162. My screwup = free PCBs...
  163. New stuff on the website: A2 buffer, isolated current sensor
  164. 12.6vDC Heaters, looking for a shortcut
  165. Fisher 80-AZ bias milliamps?
  166. Can shed some light on this EL 34 schematic diagram
  167. Solid State Rectifier in Dynaco Tube Amp
  168. Big chassis designs!
  169. 12ax7 LP
  170. plitron output w/ cfb usage ideas
  171. 390 ohm should have been 390k ohm
  172. Advice sought re what tube power amp
  173. EL34 SED Winged C Black Prints: original??
  174. OPTx from Ogonowski
  175. Aikido cathode follower (ACF) with 12au7
  176. Ampeg vt60 tri ax (did it really exist?)
  177. SEP EL-34 to 6L6GC?
  178. Volume Pot Spec
  179. My Tube Pre-Amp Picking up an AM radio station?
  180. Philips 6SN7 GTA & GTB
  181. ST-120 Problem With Rectifier Tube
  182. New Yaqin VK-2100
  183. Electronic parts and sub-zero temperature
  184. Bendix 6384 as EL34: Experience anyone?
  185. Audioresearch LS2B schematic needed
  186. input noise - too simple - but need explaination
  187. Plate voltage with/without tube (for fine tune bias adjustemnt)
  188. Using trimmers / potentiometers to adjust tube operating points
  189. KT88 SED winged C tolerance tall for quad
  190. Power Transformer Tolerances
  191. 12E1 Ultra Linear
  192. Comparison KT150 versus KT120
  193. 6sn7: GT GTA GTB sono differences for HIFI
  194. Audio Research LS5 Power Supply Problem
  195. Vintage grundig vs. new Yaqin. Advice?
  196. 5AR4 PSU
  197. What tube is this ?
  198. Need Schematic
  199. Budget PP Iron: Transcendar or Edcor?
  200. Yaqin MC-10L buzz
  201. Transformer buzzing when filament section is loaded
  202. Grid Stopper v Grid Leak on el84
  203. 2.5V Heater Tranformer-Best to Use One Per Channel?
  204. Amp: KT88 push-pull shunt feedback output via p-channel fet
  205. My biggest fear....
  206. I've made an awful mess...
  207. Any input for a tube noob's first attempt? Flea Watt 12b4, 6dj8, low B+
  208. HV scope use
  209. Kolster-Brandes er30
  210. Buzz that goes away when input grounded.
  211. Hovland HP-100 tube replacement
  212. Dynaco ST-120 Turn On Pop or Problem
  213. Grounding two channel preamp sharing a psu.
  214. Convert hybrid amp to pure tube output?
  215. Please Help me with this tubes
  216. resistor maximum voltage rating
  217. 211- 6e5p full amp. The first setps
  218. E810F and general pentodes design question
  219. Pop goes the bias cap.
  220. High Power Single Ended Triode, Design
  221. Yaqin MS-6V6 vs. Markhill MS-6V6
  222. Schematic please: Luxman MQ-70?
  223. Aikido tube preamp with Tortuga LDR volume control
  224. Type 37 tube preamp
  225. Figuring out a KT88 datasheet?
  226. Power supply 260V for tube preamp
  227. Aikido Tube with Tortuga volume control project
  228. Adding a pre out to amp
  229. One or two ECC82 for two channels (crosstalk)!
  230. Red Pilot (240)
  231. 77:1 Output Transformer Question
  232. Power transformer recommendation Kt88 SE and JE labs Riaa
  233. Tube output power for OPT calculation
  234. 6sn7 tube anode folower question?????
  235. Goldox 9300
  236. good quality/sounding preamp advice
  237. PL84 schematic question.
  238. YouTube Video: 12AX7 comparisons.
  239. How many volts ???
  240. Greetings all/ (newbie) Need Advice!
  241. Psud and Single Ended Amplifier
  242. Socket Combiniations
  243. From Potentiometer to Stepped Attenuator
  244. No need for bleed resistors on Fisher 90-T
  245. Sophia 300B+ carbon
  246. Capacitor Temperature
  247. PL519 amp SE
  248. C3g Headphone design - will this work?
  249. Luxman 2A3 amp SE
  250. Capacitor on Aikido Power Supply Sampling Circuit

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