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  1. isolation test
  2. Western Electric 437A preamp
  3. solid-state rectrification
  4. Class AB
  5. push-pull
  6. Need help ID tango-lookalike transformers
  7. TV Valves blast from the past..
  8. Tubes suggestions for parafeed headphones amp ?
  9. CCS Loadline
  10. Universal power supply for ECC85 EL84
  11. Conversion Project
  12. Dynaco PAS I/O PCB Grounding
  13. CCS for anode load
  14. OTL Power Supply: Halfwave vs Virtual Ground
  15. Can NOS tubes have emission staining on the glass?
  16. Capacitor Drain for Tube Bench Power Supply ?
  17. Grid leak resistors and dc-coupling
  18. Output transformer at speaker?
  19. Newbie just wondering if this PP amp looks ok
  20. 6P36S push pull HiFi amp
  21. Another Output Transformer Wiring Question
  22. Cathode bias for EL84 PPP
  23. Output Transformer Wiring Question
  24. NJ7P Tube Database
  25. solving my old radiogram sound issues - help
  26. 6H9c Idle Current.
  27. 12E1 SE amp suggestions.
  28. Direct Coupled Output Stage, DC Bias Balance
  29. Pre-amp tube suggestions for 2A3 output tube
  30. AirTight ATM-1 Schematic
  31. Counterpoint SA 5000 Service manual and PSU
  32. Rectifier tube ? - Berman 76 preamp
  33. Cathode feedback (SE amp)
  34. Will anybody interest in stamp size ccs module?
  35. Fairchild voltage questions
  36. Help with a Sylvania 7695 Project
  37. Flicker Noise dominates triode noise in audio (AES)
  38. A tube for SE with 1k-1k5 load
  39. scott stereomaster 233 restoration
  40. Homebrew Dynaco MkIII Problems - PLEASE HELP!
  41. What to do with C3g tubes
  42. Can anyone ID an output transformer's part number?
  43. Nestorovic NA-1 & Alpha-1 Schematics
  44. Data for 6BD2
  45. Ken Shindo R.I.P
  46. HiFi 6n9p EL34 B + 5z3p Class A Tube valve amplifier
  47. Seas Trym with SE KT88 amplifier?
  48. 845-Amp-IT-Coupled
  49. Data for 6RA3
  50. Miniwatt N3 not turning on!
  51. Help with tube for power supply...
  52. AVC vs TVC for 10y line preamp
  53. help needed with Lumley 120 monoblocks + Sonus Fabre speakers
  54. help on 845 amp
  55. High voltage power tube question
  56. Tribute OPT for PSE 300B
  57. Floating Paraphase.
  58. 6Q7G as driver in RH807
  59. Custom tubes4hifi m-125 monoblocks
  60. Antique Audio Preamlifier made in USA
  61. directly heated tube rectifiers
  62. Biasing a 12EA6 low voltage pentode
  63. Power supply doubt
  64. Vinyl Savor's Octal 6GL7 preamp?
  65. 837 tube
  66. Tone control bypass (Kontakt KT-7)
  67. drdwers
  68. Amplifier Sensitivity?
  69. identify nickel laminations
  70. Recapping Vintage EL84 amp
  71. Luxman Active 3-way Tube Crossover
  72. opinion on dynaco mark VI
  73. How can i have 450 Volts ?
  74. Balanced Preamp
  75. ecc99-300b
  76. Question about the tube specs/testing?
  77. Transformer Winding Configuration, Hafler 2,815,402
  78. PSU with Choke for Loftin-White 2A3
  79. HP 8903 Pete Millet's Software on Window 8 ?
  80. Cathode Destruction
  81. More radio shack dissapointment
  82. What to do with transformer secondary when used as a choke?
  83. Slight transformer buzzing in Engineers Amp
  84. Couple Gyrator Questions
  85. Shishido/Loftin-White 2A3/45 Extasy..
  86. When is a tube not a Valve?
  87. Relay Recommendataion
  88. 6080 SE triode amplifier
  89. Tetra Sans PS Phono Stage Power Supply
  90. transformer test
  91. New OTL headphone project with EC88 and 6080
  92. Philips Tube Code
  93. Edcor GXPP vs. CXPP
  94. Shorting or Non-Shorting Rotary Switch: Hi-Low Z tube headphone amp
  95. affordable potted power transformer?
  96. Am I pushing the envelope too far? Layout concerns.
  97. Pete Millet's Uniamp
  98. 6211 for???
  99. Picking an output transformer: power vs. sound quality
  100. Tube emulation with transistors
  101. Altec 1570b Tube Swap
  102. Popping stepped attenuator
  103. 6922 driver/cathodyne - direct coupled
  104. Solid state rectifier with these tubes
  105. Need advice -- Improving an old tube amp
  106. KT88 SE developed a buzz
  107. Guidance on amp design
  108. OTL3 Autograph Series
  109. DAC Tube i/v help!
  110. Need help figuring out a tube amp!
  111. Parallel 12AT7 output stage design?
  112. 6SN7 SRPP
  113. Problem Bi-Amping
  114. Amplifier recommendation
  115. DIY tube amplifier got no sound but all tubes are fired up.
  116. Circuit for Melos 333
  117. DHT Tube regulated power supply
  118. Akai M8 Restoration, newbie questions
  119. Bench Power Supply - what to get?
  120. Telefunken RS241 Design Help
  121. Telefunken Hymnus 5328 MX console
  122. Some Dummy DHT Questions
  123. Inductance loading tube stage questions
  124. Simple tube kit for tube sound ?
  125. Voltage Divider with Capacitor Across Resistor to Ground
  126. FM Demodulator for Tube receivers
  127. The best amp to DIY?
  128. Heath Kit Pre Amp
  129. Preamp hiss noise
  130. Tube preamp?
  131. 417a load line
  132. 6N1 + 6P3P build, need some help.
  133. Caps connected in series in Audio Note kit 4
  134. Ground loop cure?
  135. Dynaco ST-70 Clone
  136. Op Amp Phase Splitter
  137. Idea for ECC85 or EM84?
  138. Why no sound?
  139. single ended tube amp sounds itself
  140. Proper Pentode Usage 717A (713A)
  141. Help with Mullard 5 20 project
  142. Help on Negative Feedback in KT66 PP
  143. Trying to understand 6BM8 regulator (audio note clone)
  144. 6AS7 headphone amp with Sophia Electric Mesh plate 274B rec. tube
  145. CR Kalypso Amp with output stage problem- Please help!
  146. "PEAK INPUT SIGNAL GRID-TO-GRID" question.
  147. EZ81 Load
  148. Rectifier question
  149. 6sn7-300b
  150. Balanced tube phono stage
  151. Your favorite 12B4A for a preamp ?
  152. Voltage rating for output coupling caps in 6J1 tube buffer?
  153. Single stage 845 amp
  154. Eagle tube library
  155. Using Choke in Choke Input Power Supply ?
  156. 6550 wrong high bias...
  157. Floating Bridged CCS Loaded P-P Tube Amp
  158. What to do with a problem Counterpoint SA-12
  159. 6Z9P Mu Stage max anode-cathode voltage
  160. Audio Innovations Series 500 parts
  161. Hagerman Trumpet phonostage
  162. PS design...success or failure?
  163. Kuba Serenade Stereo Console - Part III - Replacing all caps
  164. schematic of Knight KP-70 preamp or anyone having this amp?
  165. 6N6P Cathode Follower design value
  166. Radiotron 32W PP amp from RDH3
  167. Heater filament questions
  168. 46 in ultralinear mode
  169. help needed need transformer prim 230/110 sec 300v appr. 20ma +6,3v or 12,6v
  170. Output transformer confusion
  171. need amp schematic help
  172. lm317 and heater supply.
  173. BJT Voltage Bootstrap - SLCF
  174. Ideas for a cheap 200mA tube rectified PSU
  175. Need help with tube rectifier
  176. Tube or Circuit Noise?
  177. JE Labs (Angela instr.) : your favorite 2A3 schematic ?
  178. Crack the Code Amp build 1000 Watt Tube Amplifier
  179. 12E1 in fixed bias - too much current!
  180. CD-DVD player vs Notebook-usb soundcard sensitivity issue
  181. photo of Knight KP-70 preamplifier for missing component
  182. heater wear sign?
  183. Musical Fidelty X-10D Clone
  184. 815 amp
  185. Jorgen Schou 31,5 OT connection
  186. Is there such a thing....
  187. Tube Rectifiers and Common Grounds
  188. vt4c.com copper tube socket mounts
  189. 1 Ohm Tap Output tranformers?
  190. Voltage Specs For Heaters-Is 2.4V Good Enough?
  191. Aikido with 5842
  192. Luxman MQ70
  193. Valve pre-amp schematic help needed
  194. valves' world - tossie Japan
  195. 211 amp , recognize the circuit?
  196. Tube Preamp: Remedy For Digital Glare?
  197. Counterpoint 7A
  198. Low Z Out Dual Triode
  199. Push Pull circuit - controlling sensitivity
  200. Moto 3 channel to Maggy 175
  201. PMillett Landfall heatsink
  202. lower the gain
  203. KT88?
  204. Sphinx Project Fourteen help wanted
  205. will this work and looking for suggestions
  206. Squeal on shutdown
  207. Newbie to SRPP and Tubes , 1 question.
  208. Question about interconnect transformers
  209. another toy - el84 PP class A
  210. Problem with biasing - no voltage drop on a cathode resistor
  211. EL84 PP current fluctuating
  212. Aikido Preamp Questions (again)
  213. Amp caused crack
  214. OPT performances
  215. Hammond 125ESE in 2A3 SE : better substitutions ?
  216. Headphone Impedance and headphone amplifier
  217. Could this tube be good for audio ?
  218. Output Transformer for SE / headphone amp
  219. pioneer sm-b200a
  220. 12AT7 Tubes ?
  221. Gold Lion kt77 bias help?
  222. Need some bias control help
  223. Lafayette LA-224a/b modernization?
  224. Need help completing vintage 6L6 amp
  225. Direct Russian equivilent for 5687, is there one ?
  226. Attenuation for 0.5dBs
  227. Dynaco ST-120 Impedance Concern Martin Logan
  228. Some 1626 Darling Amp Questions
  229. Choosing a SE 2A3 shematic : hum as a criteria...
  230. Rectifier question, voltage across diode.
  231. Angela simple 2A3
  232. Cathode follower - resistor calculations/software
  233. Desperately Seeking OPT Covers
  234. Modified Tube Cricket Amp Questions
  235. Best sounding DIY amp kits for 45, 2A3 or 300B
  236. Pentode's screen voltage/current
  237. KT88 Cathode Current Runaway/Oscillations?
  238. O'netics, Electra Print: anyone have both?
  239. How to maximize power transfer in tube circuit designs, damping is not the question!
  240. Inexpensive 2.5k primary SET OPT with 90mA+ DC bias rating?
  241. 4p1L Ultralinear
  242. RH300B 12W with 1% THD
  243. This is where the adventure begins
  244. 12AU7 pre rebuild suggestions
  245. Subwoofer Channel on Tube Amp
  246. Changing input tube from 12ax7 to 6AU6A on OTL project
  247. Yaqin MC5881a
  248. Humming Sound from tube amp
  249. Level Five 2A3 SE schematic : opinions ?
  250. My screwup = free PCBs...

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