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  1. Transconductance amplifier for headphones.
  2. El Cheapo information?
  3. Aikido 9-Pin Configuration
  4. Strange motorboating issue
  5. Lumley M120 Monoblocks - Need Manual, schematic or anything !!!
  6. Substituting higher wattage resistors
  7. cap coupling to interstage transformer or direct coupling?
  8. A question of feedback..
  9. Two Monoblocks "Dying" Within Days Of Each Other
  10. Russian 1Zh24B Pentods / design assistance.
  11. What Tubes for 5.8k PP transformers
  12. Problem with a power transformer.
  13. 300B OTL Preamp/Headphone Amp
  14. tantalum resistors
  15. 6BM8 in STC mode
  16. My Moscode again: What is the bias current?
  17. OTL WCF headphone amp build + awesome prototype material
  18. Type 42 single ended ideas
  19. Help with my Moscode 300 amp
  20. Thoughts on this volume potentiometer?
  21. Optimum load impedance for PCL85?
  22. Croatian triode Festival 2014.
  23. Old ekco tv transformers
  24. vacuum tube score.. what to do with
  25. Valve based disco mixer.
  26. Webcor ceramic phono input circuitry suggestions?
  27. Position of OPT windings
  28. sd2 seven pin??
  29. Help design a Small 250VDC PSU for tube preamp
  30. Bright Driver Tubes 12AU7, 12BH7, 5814...
  31. Question about using tube socket center hole for star ground
  32. Heathkit UA-2 clone project
  33. Schematic CAD Program
  34. Latest on the RH amps..
  35. Transformer design program
  36. 807 "Musicians Amplifier" help
  37. J.E. LABS PP2A3 POWER SUPPLY ?
  38. Mono Block Building Project
  39. EL34 CCS ideas
  40. Magnavox 8601-20
  41. wood/metal vs all-metal chassis
  42. Design data on dry battery tubes
  43. Differential tube with a gain stage 1178
  44. 6C4C tube ...Good to buy ?
  45. Including a C- winding on a filament transformer
  46. CINEMAG 15B TRANSFORMERS balanced>unbalanced
  47. Rebuilt Heathkit AA32 with hum on MAG PHONO input
  48. Electrolytic cap question
  49. Tube Socket ID
  50. JJ 5Y3S is too tall...need smaller tube
  51. Uniamp 2A3
  52. buzz noise from paraphase circuit
  53. Benefits of Enhanced Triode Connection
  54. Working out a valves load resistance?
  55. 813 Alternatives
  56. Help 6N6T pinout
  57. Very large parafeed cap
  58. Bright purple flash 6N1P
  59. Harman Kardon Citation II - rebuild questions
  60. Stoetkit junior mk2
  61. 1619 Push pull output stage
  62. Tube getter
  63. The sensation of the 21st Century. Galvanic SUPER HIGH END PP power for all types of
  64. Audible Illusions and 6922
  65. quick access tube amp protection
  66. Identifying Genalex KT66 matched pair question
  67. Hunting 100Hz noise in SRPP+ stage
  68. JJ ECC83S Biasing conditions
  69. Audiophiletalk - Dirt Cheap SE
  70. 12AL8 Head-Amp with UTC Output Transformer
  71. SET monoblocks?
  72. EL84 Push Pull design from left over parts
  73. Strange UL Transformers
  74. Stabilization balanced currents in the PP stage.
  75. Current mirror stage in PP
  76. EL34 SE ultralinear schematic
  77. Question: Acceptable DC current in push-pull output transformer due to tube mismatch?
  78. Toroid Power Transformer For GM-70 845 211 1000V
  79. Building the "Crystal Palace" Amp
  80. Improved Sound Card Interface - Ideas and Suggestions?
  81. Upgrading OPTs in production amp? (Yaquin MC-10L)
  82. any good Triode 6H8C preamp schematics out there???
  83. pushpull 6aq5 distortion
  84. Mr. Lian 845 SET more kit rather than commercial product.
  85. Opinion for otl ocl headphone amp
  86. Tube-newby wanting to make a good tube amp
  87. Anyone used a voltage tripler PS?
  88. Audioromy 828A / FU-29 tube layout
  89. Choosing Cathode Bypass Capacitor
  90. Ground loop gremlins
  91. Crackling Amp after Accident
  92. New CCS/ depletion mode MOSFETs available... experience anyone?
  93. Mengyue Mini
  94. Parafeed quest
  95. Determining linearity - differential gain stage
  96. 6HB6 - Any pratical experience?
  97. 27 Tube Preamp design questions
  98. Output Transformers Mount Position
  99. Critique please: Fixed bias 7591 SE
  100. Coupling Cap Improvements?
  101. RL 12T 15
  102. Tube instead of anode resistor
  103. HELP!! Terrible 50Hz hum in Mullard 10W DIY amp
  104. My New 45 SET (choke-loaded 6SN7, direct-coupled)
  105. Hf31 fidelity valve type
  106. Design of transformers for valve amplifiers.Part2
  107. Harman Kardon ta5000X alignment/manual
  108. Help with an analog meter hack
  109. dirkwright phono
  110. Zener Voltage Regulator
  111. Fisher X-101-B Substitute for 7591
  112. UNU-pnono riaa mm preamp
  113. My old amps
  114. Switching regulator on Kickstarter
  115. my yaqin 100b will not bias on v1 v3
  116. Zenith model B835R
  117. Want to build 2a3 amp for old radio
  118. Preamp Advice
  119. simple 5687 pre amp help
  120. Pulling TV From 61 Maggie Imperial Console?
  121. I can buy some 6U9's cheap - are they any good, and what could I build?
  122. K8011/K8010 PCB build thread
  123. Choosing an op point when using a tube 'off label'
  124. Choke inputs
  125. Unbalanced In > Balanced Out line amp - How To Do It?
  126. 6146b output transformer. I'm new and I need help.
  127. Your first DiY Low Cost/Low Voltage tube AMP
  128. Need some advice on OPT for kt88/6l6
  129. 1:1:1 transformers
  130. Output transformer in the cathode?
  131. Popping DC
  132. Power transformer wiring issues
  133. easy question - Magnavox 86-01 owners...
  134. Mic preamp input transformer alternative?
  135. What's the Best Way to Reduce Gain in a Preamp
  136. safety with high voltage input capacitor ?
  137. SE EL84 amp - reducing 100Hz hum
  138. Photos of large DHT preamps? (Or large amps in general)
  139. Minimum pin length (noval)
  140. Biasing of KT120
  141. SE to balanced transformer
  142. Decoupling Cap value - How Much?
  143. Cathode bypass Cap vs. No Bypass Cap
  144. Interesting circuit I thought.
  145. Yet another K12G thread
  146. 6N3 tube preamp question
  147. Driver vs Power tube
  148. Help in Bias tube amp for Adis Devy 7
  149. Tubes and HT
  150. HiFiMan EF-2A schematic sought
  151. Please, help with a WE91 project on behalf of a friend
  152. Proposed Headphone Amp Overhaul?
  153. protection of downstream line amp
  154. Is the 6E6P suitable for audio?
  155. me clone proto EL/PL 504
  156. Improving headphone amplifier
  157. 5902 LSTPICE Model
  158. Canary CA-301 PSU
  159. 3B28 oscilator
  160. A lot of schematics
  161. V8 amp
  162. market by Jac music
  163. 6P3C-1 SE ? .
  164. Cary slp70: Worth to upgrade?
  165. Hickok 123B tube tester
  166. Adding NFB makes headphone amp sound AWFUL!!!
  167. Filaments hard wired to B+ on EZ81 base
  168. What the bird is OS 18/600?
  169. ccs 10m90s what is wrong?
  170. Topology for balanced preamp
  171. 6v6 vs. 6l6 vs. 807 soundwise..
  172. Opinions/Advice on Triode Strap method
  173. Something like a Miniwatt N3 or APPJ PA0901A
  174. Extraordinary harmonics. Type 47 # tube amp.
  175. Made a new tube amp, 6J5 +27 +45
  176. Anyone ever play around with a GU-72?
  177. Possibility of using a UTC LMI-500 transformer...
  178. Aikido transformer
  179. Can someone explain why you need to re-adjust the balance on a tube amp every time
  180. Which factory made these tubes ?
  181. 813 and gm70
  182. 13E1 Push Pull
  183. dump find.
  184. ...6SN7GT operating points tube help.......
  185. 6L6 6SJ7 Amp please pick faults if any
  186. Updated DIY EL34B 6SJ7 SE Amp
  187. 6C18 x 6C33
  188. Vintage tube amp find
  189. any benefit to screen-grid drive a 6V6?
  190. Brown face Scott LK72
  191. Pilot 1060 integrated - make it better!
  192. Should I ground my K12G or my Bugle 2?
  193. 6c33 amp convert to 6c41
  194. STA-LEVEL thumbs problem
  195. Amp motorboating at power up
  196. Spice models for AL4 and RS242 tubes
  197. Mains Switch
  198. Suggestions for big output stage needed
  199. Very Good (or best?) 12B4 schematic?
  200. Amplifier for active bookshelf speakers
  201. Olson AM-240 schematic needed
  202. Valve amp - maintenance
  203. Your opinion about Rotel 930AX to hyrbid mod
  204. Weston Tube Tester 774-5
  205. Tube circuit sim software for free?
  206. 6v6 family tubes
  207. Troublesome bias resistor, cathodyne stage
  208. 6AQ5 excellent for line stage?
  209. Datasheet 6P42s and 6P45C
  210. Quad / Cyrus impedance matching
  211. Zobel network at primary audio trafo?
  212. ECL86 question
  213. 500c buzzing power transformer
  214. LM4702+6L6GB/807
  215. TubeAudio Mixer Blog
  216. Finally started on my 6L6 amp. Need tube suggestions.
  217. Just another Scott thread
  218. Design for overdriven output stage
  219. Seeking Articals On Audio Transformer Design & Construction.
  220. Bias el34 pp
  221. Photo Gallery.
  222. Precision S35
  223. 6L6WGB
  224. 6BQ7A Driver
  225. Advise for Simpson 340 signal generator problem
  226. Armaco TTHF or Calrad AP 15 What to do What to do?...
  227. Screen Power and Warmup
  228. Wanting copies of Prof. Alexander Bereskin's transformer winding pictures.
  229. what's the brand of this capacitor sounds great ?
  230. Edcor CXSE25-8-3.2K or Transcendar TT-017-OT?
  231. PP 2A3 Fixed Bias
  232. RL12P35 convert to el34
  233. Statistical regulator from VA 4rd edition
  234. Matching Impedances (the Math behind it) Please Advise if you have a grasp. Xfmrs etc
  235. Help 6AQ5 pushpull
  236. HV Logic Control Approach
  237. Valve heater question
  238. Phase inverter adjustment - Fisher 80AZ
  239. Repurposing a Bogen CHB-35A
  240. SMPS
  241. Interstage and bias failure
  242. Grid 2 current for GU19-1
  243. 6x5 tube
  244. IT coupled 6BG6GA
  245. Mystery noise has got me baffled
  246. Dynaco PAS: too much liposuction?
  247. LP Tape Noise
  248. YAKOV ARONOV MA-100
  249. Help for balance-tone control-mode selector bypass
  250. Opinions please: seeking a first class DIY SET amp design

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