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  1. Need advice -- Improving an old tube amp
  2. KT88 SE developed a buzz
  3. Guidance on amp design
  4. OTL3 Autograph Series
  5. DAC Tube i/v help!
  6. Need help figuring out a tube amp!
  7. Parallel 12AT7 output stage design?
  8. 6SN7 SRPP
  9. Problem Bi-Amping
  10. Amplifier recommendation
  11. DIY tube amplifier got no sound but all tubes are fired up.
  12. Circuit for Melos 333
  13. DHT Tube regulated power supply
  14. Akai M8 Restoration, newbie questions
  15. Bench Power Supply - what to get?
  16. Telefunken RS241 Design Help
  17. Telefunken Hymnus 5328 MX console
  18. Some Dummy DHT Questions
  19. Inductance loading tube stage questions
  20. Simple tube kit for tube sound ?
  21. Voltage Divider with Capacitor Across Resistor to Ground
  22. FM Demodulator for Tube receivers
  23. The best amp to DIY?
  24. SE Tubelab / EL34b tubes / Transformers
  25. Heath Kit Pre Amp
  26. Preamp hiss noise
  27. Tube preamp?
  28. 417a load line
  29. 6N1 + 6P3P build, need some help.
  30. Caps connected in series in Audio Note kit 4
  31. Ground loop cure?
  32. Dynaco ST-70 Clone
  33. Op Amp Phase Splitter
  34. Idea for ECC85 or EM84?
  35. Why no sound?
  36. single ended tube amp sounds itself
  37. Proper Pentode Usage 717A (713A)
  38. Help with Mullard 5 20 project
  39. Help on Negative Feedback in KT66 PP
  40. Trying to understand 6BM8 regulator (audio note clone)
  41. 6AS7 headphone amp with Sophia Electric Mesh plate 274B rec. tube
  42. CR Kalypso Amp with output stage problem- Please help!
  43. "PEAK INPUT SIGNAL GRID-TO-GRID" question.
  44. EZ81 Load
  45. Rectifier question
  46. 6sn7-300b
  47. Balanced tube phono stage
  48. Your favorite 12B4A for a preamp ?
  49. Voltage rating for output coupling caps in 6J1 tube buffer?
  50. Single stage 845 amp
  51. Eagle tube library
  52. Using Choke in Choke Input Power Supply ?
  53. 6550 wrong high bias...
  54. Floating Bridged CCS Loaded P-P Tube Amp
  55. What to do with a problem Counterpoint SA-12
  56. 6Z9P Mu Stage max anode-cathode voltage
  57. Audio Innovations Series 500 parts
  58. Hagerman Trumpet phonostage
  59. PS design...success or failure?
  60. Kuba Serenade Stereo Console - Part III - Replacing all caps
  61. schematic of Knight KP-70 preamp or anyone having this amp?
  62. 6N6P Cathode Follower design value
  63. Radiotron 32W PP amp from RDH3
  64. Heater filament questions
  65. 46 in ultralinear mode
  66. help needed need transformer prim 230/110 sec 300v appr. 20ma +6,3v or 12,6v
  67. Output transformer confusion
  68. need amp schematic help
  69. reviving an old Randall RGT100
  70. lm317 and heater supply.
  71. BJT Voltage Bootstrap - SLCF
  72. Ideas for a cheap 200mA tube rectified PSU
  73. Need help with tube rectifier
  74. Tube or Circuit Noise?
  75. JE Labs (Angela instr.) : your favorite 2A3 schematic ?
  76. Crack the Code Amp build 1000 Watt Tube Amplifier
  77. 12E1 in fixed bias - too much current!
  78. CD-DVD player vs Notebook-usb soundcard sensitivity issue
  79. photo of Knight KP-70 preamplifier for missing component
  80. heater wear sign?
  81. Musical Fidelty X-10D Clone
  82. 815 amp
  83. Jorgen Schou 31,5 OT connection
  84. Is there such a thing....
  85. Tube Rectifiers and Common Grounds
  86. vt4c.com copper tube socket mounts
  87. 1 Ohm Tap Output tranformers?
  88. Voltage Specs For Heaters-Is 2.4V Good Enough?
  89. Aikido with 5842
  90. Luxman MQ70
  91. Valve pre-amp schematic help needed
  92. valves' world - tossie Japan
  93. 211 amp , recognize the circuit?
  94. Tube Preamp: Remedy For Digital Glare?
  95. Tubelab SSE without tube rectifier
  96. Counterpoint 7A
  97. Low Z Out Dual Triode
  98. Push Pull circuit - controlling sensitivity
  99. Moto 3 channel to Maggy 175
  100. PMillett Landfall heatsink
  101. lower the gain
  102. KT88?
  103. Sphinx Project Fourteen help wanted
  104. will this work and looking for suggestions
  105. Squeal on shutdown
  106. Newbie to SRPP and Tubes , 1 question.
  107. Question about interconnect transformers
  108. another toy - el84 PP class A
  109. Problem with biasing - no voltage drop on a cathode resistor
  110. EL84 PP current fluctuating
  111. Aikido Preamp Questions (again)
  112. Amp caused crack
  113. OPT performances
  114. Hammond 125ESE in 2A3 SE : better substitutions ?
  115. Headphone Impedance and headphone amplifier
  116. Could this tube be good for audio ?
  117. Output Transformer for SE / headphone amp
  118. pioneer sm-b200a
  119. 12AT7 Tubes ?
  120. Gold Lion kt77 bias help?
  121. Need some bias control help
  122. Lafayette LA-224a/b modernization?
  123. Need help completing vintage 6L6 amp
  124. Direct Russian equivilent for 5687, is there one ?
  125. Attenuation for 0.5dBs
  126. Dynaco ST-120 Impedance Concern Martin Logan
  127. Some 1626 Darling Amp Questions
  128. Choosing a SE 2A3 shematic : hum as a criteria...
  129. Rectifier question, voltage across diode.
  130. Angela simple 2A3
  131. Cathode follower - resistor calculations/software
  132. Desperately Seeking OPT Covers
  133. Modified Tube Cricket Amp Questions
  134. Best sounding DIY amp kits for 45, 2A3 or 300B
  135. Pentode's screen voltage/current
  136. KT88 Cathode Current Runaway/Oscillations?
  137. O'netics, Electra Print: anyone have both?
  138. How to maximize power transfer in tube circuit designs, damping is not the question!
  139. Inexpensive 2.5k primary SET OPT with 90mA+ DC bias rating?
  140. 4p1L Ultralinear
  141. RH300B 12W with 1% THD
  142. This is where the adventure begins
  143. 12AU7 pre rebuild suggestions
  144. Subwoofer Channel on Tube Amp
  145. Changing input tube from 12ax7 to 6AU6A on OTL project
  146. Yaqin MC5881a
  147. Humming Sound from tube amp
  148. Level Five 2A3 SE schematic : opinions ?
  149. My screwup = free PCBs...
  150. New stuff on the website: A2 buffer, isolated current sensor
  151. 12.6vDC Heaters, looking for a shortcut
  152. Fisher 80-AZ bias milliamps?
  153. Can shed some light on this EL 34 schematic diagram
  154. Solid State Rectifier in Dynaco Tube Amp
  155. Big chassis designs!
  156. 12ax7 LP
  157. plitron output w/ cfb usage ideas
  158. 390 ohm should have been 390k ohm
  159. Advice sought re what tube power amp
  160. EL34 SED Winged C Black Prints: original??
  161. OPTx from Ogonowski
  162. Aikido cathode follower (ACF) with 12au7
  163. Ampeg vt60 tri ax (did it really exist?)
  164. SEP EL-34 to 6L6GC?
  165. Volume Pot Spec
  166. My Tube Pre-Amp Picking up an AM radio station?
  167. Philips 6SN7 GTA & GTB
  168. ST-120 Problem With Rectifier Tube
  169. New Yaqin VK-2100
  170. Electronic parts and sub-zero temperature
  171. Bendix 6384 as EL34: Experience anyone?
  172. Audioresearch LS2B schematic needed
  173. input noise - too simple - but need explaination
  174. Plate voltage with/without tube (for fine tune bias adjustemnt)
  175. Using trimmers / potentiometers to adjust tube operating points
  176. KT88 SED winged C tolerance tall for quad
  177. Power Transformer Tolerances
  178. 12E1 Ultra Linear
  179. Comparison KT150 versus KT120
  180. 6sn7: GT GTA GTB sono differences for HIFI
  181. Audio Research LS5 Power Supply Problem
  182. Vintage grundig vs. new Yaqin. Advice?
  183. 5AR4 PSU
  184. What tube is this ?
  185. Need Schematic
  186. Budget PP Iron: Transcendar or Edcor?
  187. Yaqin MC-10L buzz
  188. Transformer buzzing when filament section is loaded
  189. Grid Stopper v Grid Leak on el84
  190. 2.5V Heater Tranformer-Best to Use One Per Channel?
  191. Amp: KT88 push-pull shunt feedback output via p-channel fet
  192. My biggest fear....
  193. I've made an awful mess...
  194. Any input for a tube noob's first attempt? Flea Watt 12b4, 6dj8, low B+
  195. HV scope use
  196. Kolster-Brandes er30
  197. Buzz that goes away when input grounded.
  198. Hovland HP-100 tube replacement
  199. Dynaco ST-120 Turn On Pop or Problem
  200. Grounding two channel preamp sharing a psu.
  201. Convert hybrid amp to pure tube output?
  202. Please Help me with this tubes
  203. resistor maximum voltage rating
  204. 211- 6e5p full amp. The first setps
  205. E810F and general pentodes design question
  206. Pop goes the bias cap.
  207. High Power Single Ended Triode, Design
  208. Yaqin MS-6V6 vs. Markhill MS-6V6
  209. Schematic please: Luxman MQ-70?
  210. Aikido tube preamp with Tortuga LDR volume control
  211. Type 37 tube preamp
  212. Figuring out a KT88 datasheet?
  213. Power supply 260V for tube preamp
  214. Aikido Tube with Tortuga volume control project
  215. Adding a pre out to amp
  216. One or two ECC82 for two channels (crosstalk)!
  217. Red Pilot (240)
  218. 77:1 Output Transformer Question
  219. Power transformer recommendation Kt88 SE and JE labs Riaa
  220. Tube output power for OPT calculation
  221. 6sn7 tube anode folower question?????
  222. Goldox 9300
  223. good quality/sounding preamp advice
  224. PL84 schematic question.
  225. YouTube Video: 12AX7 comparisons.
  226. How many volts ???
  227. Greetings all/ (newbie) Need Advice!
  228. Psud and Single Ended Amplifier
  229. Socket Combiniations
  230. From Potentiometer to Stepped Attenuator
  231. No need for bleed resistors on Fisher 90-T
  232. Sophia 300B+ carbon
  233. Capacitor Temperature
  234. PL519 amp SE
  235. C3g Headphone design - will this work?
  236. Luxman 2A3 amp SE
  237. Capacitor on Aikido Power Supply Sampling Circuit
  238. Well, what have I done now?
  239. Aikido CF cathode resistor?
  240. D3A - 6P45S/El519 SE "The staircase" my first h-end amplifier.
  241. SET Cathode Biased vs. Fixed Bias?
  242. JAN6418 pre-amp advise
  243. SOHA II amp tripping
  244. 6JN6 LTspice model?
  245. unusual output transformers, what are they for?
  246. Cheap power amp kit with 6N2 + 6P3
  247. KT88 AMP I'm not sure about power supply
  248. buzz from tubes
  249. Good Power Supply??
  250. HK guitar amp - help with repair

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