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  1. Parallel 12AT7 output stage design?
  2. 6SN7 SRPP
  3. Problem Bi-Amping
  4. Amplifier recommendation
  5. DIY tube amplifier got no sound but all tubes are fired up.
  6. Circuit for Melos 333
  7. DHT Tube regulated power supply
  8. Akai M8 Restoration, newbie questions
  9. Bench Power Supply - what to get?
  10. Telefunken RS241 Design Help
  11. Telefunken Hymnus 5328 MX console
  12. Some Dummy DHT Questions
  13. Inductance loading tube stage questions
  14. Simple tube kit for tube sound ?
  15. Voltage Divider with Capacitor Across Resistor to Ground
  16. FM Demodulator for Tube receivers
  17. The best amp to DIY?
  18. SE Tubelab / EL34b tubes / Transformers
  19. Heath Kit Pre Amp
  20. Preamp hiss noise
  21. Tube preamp?
  22. 417a load line
  23. 6N1 + 6P3P build, need some help.
  24. Caps connected in series in Audio Note kit 4
  25. Ground loop cure?
  26. Dynaco ST-70 Clone
  27. Op Amp Phase Splitter
  28. Idea for ECC85 or EM84?
  29. Why no sound?
  30. single ended tube amp sounds itself
  31. Proper Pentode Usage 717A (713A)
  32. Help with Mullard 5 20 project
  33. Help on Negative Feedback in KT66 PP
  34. Trying to understand 6BM8 regulator (audio note clone)
  35. 6AS7 headphone amp with Sophia Electric Mesh plate 274B rec. tube
  36. CR Kalypso Amp with output stage problem- Please help!
  37. "PEAK INPUT SIGNAL GRID-TO-GRID" question.
  38. EZ81 Load
  39. Rectifier question
  40. 6sn7-300b
  41. Balanced tube phono stage
  42. Your favorite 12B4A for a preamp ?
  43. Voltage rating for output coupling caps in 6J1 tube buffer?
  44. Single stage 845 amp
  45. Eagle tube library
  46. Using Choke in Choke Input Power Supply ?
  47. 6550 wrong high bias...
  48. Floating Bridged CCS Loaded P-P Tube Amp
  49. What to do with a problem Counterpoint SA-12
  50. 6Z9P Mu Stage max anode-cathode voltage
  51. Audio Innovations Series 500 parts
  52. Hagerman Trumpet phonostage
  53. PS design...success or failure?
  54. Kuba Serenade Stereo Console - Part III - Replacing all caps
  55. schematic of Knight KP-70 preamp or anyone having this amp?
  56. 6N6P Cathode Follower design value
  57. Radiotron 32W PP amp from RDH3
  58. Heater filament questions
  59. 46 in ultralinear mode
  60. help needed need transformer prim 230/110 sec 300v appr. 20ma +6,3v or 12,6v
  61. Output transformer confusion
  62. need amp schematic help
  63. reviving an old Randall RGT100
  64. lm317 and heater supply.
  65. BJT Voltage Bootstrap - SLCF
  66. Ideas for a cheap 200mA tube rectified PSU
  67. Need help with tube rectifier
  68. Tube or Circuit Noise?
  69. JE Labs (Angela instr.) : your favorite 2A3 schematic ?
  70. Crack the Code Amp build 1000 Watt Tube Amplifier
  71. 12E1 in fixed bias - too much current!
  72. CD-DVD player vs Notebook-usb soundcard sensitivity issue
  73. photo of Knight KP-70 preamplifier for missing component
  74. heater wear sign?
  75. Musical Fidelty X-10D Clone
  76. 815 amp
  77. Jorgen Schou 31,5 OT connection
  78. Is there such a thing....
  79. Tube Rectifiers and Common Grounds
  80. vt4c.com copper tube socket mounts
  81. 1 Ohm Tap Output tranformers?
  82. Voltage Specs For Heaters-Is 2.4V Good Enough?
  83. Aikido with 5842
  84. Luxman MQ70
  85. Valve pre-amp schematic help needed
  86. valves' world - tossie Japan
  87. 211 amp , recognize the circuit?
  88. Tube Preamp: Remedy For Digital Glare?
  89. Tubelab SSE without tube rectifier
  90. Counterpoint 7A
  91. Low Z Out Dual Triode
  92. Push Pull circuit - controlling sensitivity
  93. Moto 3 channel to Maggy 175
  94. PMillett Landfall heatsink
  95. lower the gain
  96. KT88?
  97. Sphinx Project Fourteen help wanted
  98. will this work and looking for suggestions
  99. Squeal on shutdown
  100. Newbie to SRPP and Tubes , 1 question.
  101. Question about interconnect transformers
  102. another toy - el84 PP class A
  103. Problem with biasing - no voltage drop on a cathode resistor
  104. EL84 PP current fluctuating
  105. Aikido Preamp Questions (again)
  106. Amp caused crack
  107. OPT performances
  108. Hammond 125ESE in 2A3 SE : better substitutions ?
  109. Headphone Impedance and headphone amplifier
  110. Could this tube be good for audio ?
  111. Output Transformer for SE / headphone amp
  112. pioneer sm-b200a
  113. 12AT7 Tubes ?
  114. Gold Lion kt77 bias help?
  115. Need some bias control help
  116. Lafayette LA-224a/b modernization?
  117. Need help completing vintage 6L6 amp
  118. Direct Russian equivilent for 5687, is there one ?
  119. Attenuation for 0.5dBs
  120. Dynaco ST-120 Impedance Concern Martin Logan
  121. Some 1626 Darling Amp Questions
  122. Choosing a SE 2A3 shematic : hum as a criteria...
  123. Rectifier question, voltage across diode.
  124. Angela simple 2A3
  125. Cathode follower - resistor calculations/software
  126. Desperately Seeking OPT Covers
  127. Modified Tube Cricket Amp Questions
  128. Best sounding DIY amp kits for 45, 2A3 or 300B
  129. Pentode's screen voltage/current
  130. KT88 Cathode Current Runaway/Oscillations?
  131. O'netics, Electra Print: anyone have both?
  132. How to maximize power transfer in tube circuit designs, damping is not the question!
  133. Inexpensive 2.5k primary SET OPT with 90mA+ DC bias rating?
  134. 4p1L Ultralinear
  135. RH300B 12W with 1% THD
  136. This is where the adventure begins
  137. 12AU7 pre rebuild suggestions
  138. Subwoofer Channel on Tube Amp
  139. Changing input tube from 12ax7 to 6AU6A on OTL project
  140. Yaqin MC5881a
  141. Humming Sound from tube amp
  142. Level Five 2A3 SE schematic : opinions ?
  143. My screwup = free PCBs...
  144. New stuff on the website: A2 buffer, isolated current sensor
  145. 12.6vDC Heaters, looking for a shortcut
  146. Fisher 80-AZ bias milliamps?
  147. Can shed some light on this EL 34 schematic diagram
  148. Solid State Rectifier in Dynaco Tube Amp
  149. Big chassis designs!
  150. 12ax7 LP
  151. plitron output w/ cfb usage ideas
  152. 390 ohm should have been 390k ohm
  153. Advice sought re what tube power amp
  154. EL34 SED Winged C Black Prints: original??
  155. OPTx from Ogonowski
  156. Aikido cathode follower (ACF) with 12au7
  157. Ampeg vt60 tri ax (did it really exist?)
  158. SEP EL-34 to 6L6GC?
  159. Volume Pot Spec
  160. My Tube Pre-Amp Picking up an AM radio station?
  161. Philips 6SN7 GTA & GTB
  162. ST-120 Problem With Rectifier Tube
  163. New Yaqin VK-2100
  164. Electronic parts and sub-zero temperature
  165. Bendix 6384 as EL34: Experience anyone?
  166. Audioresearch LS2B schematic needed
  167. input noise - too simple - but need explaination
  168. Plate voltage with/without tube (for fine tune bias adjustemnt)
  169. Using trimmers / potentiometers to adjust tube operating points
  170. KT88 SED winged C tolerance tall for quad
  171. Power Transformer Tolerances
  172. 12E1 Ultra Linear
  173. Comparison KT150 versus KT120
  174. 6sn7: GT GTA GTB sono differences for HIFI
  175. Audio Research LS5 Power Supply Problem
  176. Vintage grundig vs. new Yaqin. Advice?
  177. 5AR4 PSU
  178. What tube is this ?
  179. Need Schematic
  180. Budget PP Iron: Transcendar or Edcor?
  181. Yaqin MC-10L buzz
  182. Transformer buzzing when filament section is loaded
  183. Grid Stopper v Grid Leak on el84
  184. 2.5V Heater Tranformer-Best to Use One Per Channel?
  185. Amp: KT88 push-pull shunt feedback output via p-channel fet
  186. My biggest fear....
  187. I've made an awful mess...
  188. Any input for a tube noob's first attempt? Flea Watt 12b4, 6dj8, low B+
  189. HV scope use
  190. Kolster-Brandes er30
  191. Buzz that goes away when input grounded.
  192. Hovland HP-100 tube replacement
  193. Dynaco ST-120 Turn On Pop or Problem
  194. Grounding two channel preamp sharing a psu.
  195. Convert hybrid amp to pure tube output?
  196. Please Help me with this tubes
  197. resistor maximum voltage rating
  198. 211- 6e5p full amp. The first setps
  199. E810F and general pentodes design question
  200. Pop goes the bias cap.
  201. High Power Single Ended Triode, Design
  202. Yaqin MS-6V6 vs. Markhill MS-6V6
  203. Schematic please: Luxman MQ-70?
  204. Aikido tube preamp with Tortuga LDR volume control
  205. Type 37 tube preamp
  206. Figuring out a KT88 datasheet?
  207. Power supply 260V for tube preamp
  208. Aikido Tube with Tortuga volume control project
  209. Adding a pre out to amp
  210. One or two ECC82 for two channels (crosstalk)!
  211. Red Pilot (240)
  212. 77:1 Output Transformer Question
  213. Power transformer recommendation Kt88 SE and JE labs Riaa
  214. Tube output power for OPT calculation
  215. 6sn7 tube anode folower question?????
  216. Goldox 9300
  217. good quality/sounding preamp advice
  218. PL84 schematic question.
  219. YouTube Video: 12AX7 comparisons.
  220. How many volts ???
  221. Greetings all/ (newbie) Need Advice!
  222. Psud and Single Ended Amplifier
  223. Socket Combiniations
  224. From Potentiometer to Stepped Attenuator
  225. No need for bleed resistors on Fisher 90-T
  226. Sophia 300B+ carbon
  227. Capacitor Temperature
  228. PL519 amp SE
  229. C3g Headphone design - will this work?
  230. Luxman 2A3 amp SE
  231. Capacitor on Aikido Power Supply Sampling Circuit
  232. Well, what have I done now?
  233. Aikido CF cathode resistor?
  234. D3A - 6P45S/El519 SE "The staircase" my first h-end amplifier.
  235. SET Cathode Biased vs. Fixed Bias?
  236. JAN6418 pre-amp advise
  237. SOHA II amp tripping
  238. 6JN6 LTspice model?
  239. unusual output transformers, what are they for?
  240. Cheap power amp kit with 6N2 + 6P3
  241. KT88 AMP I'm not sure about power supply
  242. buzz from tubes
  243. Good Power Supply??
  244. HK guitar amp - help with repair
  245. Audio Research SP6C
  246. Junk Audio Project (pics)
  247. SE SV83 Paralled Tube Amplifer
  248. Hum in SVP preamp circuit
  249. Advice/tips on tube preamplifier wanted
  250. Transformer Windfall. Now what?

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