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  1. Rockola juke box amp - unusual features
  2. 3.5 watt ECL82 Amp
  3. 12BH7 Headphone Amp
  4. White Cathode Follower Quandary
  5. help in aikido for sennheiser hd580
  6. Home brew more economical than an ST-35
  7. Modeling Pull-Push transformer in LTspice
  8. The Fisher 400-C "Fixer-upper"
  9. Power Transformer question/concern
  10. Nice little schematic drawing app w/ tube symbols
  11. best budget diy kit?
  12. Transconductance amplifier for headphones.
  13. El Cheapo information?
  14. Aikido 9-Pin Configuration
  15. Strange motorboating issue
  16. Lumley M120 Monoblocks - Need Manual, schematic or anything !!!
  17. Substituting higher wattage resistors
  18. cap coupling to interstage transformer or direct coupling?
  19. A question of feedback..
  20. Two Monoblocks "Dying" Within Days Of Each Other
  21. Russian 1Zh24B Pentods / design assistance.
  22. What Tubes for 5.8k PP transformers
  23. Problem with a power transformer.
  24. 300B OTL Preamp/Headphone Amp
  25. tantalum resistors
  26. 6BM8 in STC mode
  27. My Moscode again: What is the bias current?
  28. OTL WCF headphone amp build + awesome prototype material
  29. Type 42 single ended ideas
  30. Help with my Moscode 300 amp
  31. Thoughts on this volume potentiometer?
  32. Optimum load impedance for PCL85?
  33. Croatian triode Festival 2014.
  34. Old ekco tv transformers
  35. vacuum tube score.. what to do with
  36. Valve based disco mixer.
  37. Webcor ceramic phono input circuitry suggestions?
  38. Position of OPT windings
  39. sd2 seven pin??
  40. Help design a Small 250VDC PSU for tube preamp
  41. Bright Driver Tubes 12AU7, 12BH7, 5814...
  42. Question about using tube socket center hole for star ground
  43. Heathkit UA-2 clone project
  44. Schematic CAD Program
  45. Latest on the RH amps..
  46. Transformer design program
  47. 807 "Musicians Amplifier" help
  48. J.E. LABS PP2A3 POWER SUPPLY ?
  49. Mono Block Building Project
  50. EL34 CCS ideas
  51. Magnavox 8601-20
  52. wood/metal vs all-metal chassis
  53. Design data on dry battery tubes
  54. Differential tube with a gain stage 1178
  55. 6C4C tube ...Good to buy ?
  56. Including a C- winding on a filament transformer
  57. CINEMAG 15B TRANSFORMERS balanced>unbalanced
  58. Rebuilt Heathkit AA32 with hum on MAG PHONO input
  59. Electrolytic cap question
  60. Tube Socket ID
  61. JJ 5Y3S is too tall...need smaller tube
  62. Uniamp 2A3
  63. buzz noise from paraphase circuit
  64. Benefits of Enhanced Triode Connection
  65. Working out a valves load resistance?
  66. 813 Alternatives
  67. Help 6N6T pinout
  68. Very large parafeed cap
  69. Bright purple flash 6N1P
  70. Harman Kardon Citation II - rebuild questions
  71. Stoetkit junior mk2
  72. 1619 Push pull output stage
  73. Tube getter
  74. The sensation of the 21st Century. Galvanic SUPER HIGH END PP power for all types of
  75. Audible Illusions and 6922
  76. quick access tube amp protection
  77. Identifying Genalex KT66 matched pair question
  78. Hunting 100Hz noise in SRPP+ stage
  79. JJ ECC83S Biasing conditions
  80. Audiophiletalk - Dirt Cheap SE
  81. 12AL8 Head-Amp with UTC Output Transformer
  82. SET monoblocks?
  83. EL84 Push Pull design from left over parts
  84. Strange UL Transformers
  85. Stabilization balanced currents in the PP stage.
  86. Current mirror stage in PP
  87. EL34 SE ultralinear schematic
  88. Question: Acceptable DC current in push-pull output transformer due to tube mismatch?
  89. Toroid Power Transformer For GM-70 845 211 1000V
  90. Building the "Crystal Palace" Amp
  91. Improved Sound Card Interface - Ideas and Suggestions?
  92. Upgrading OPTs in production amp? (Yaquin MC-10L)
  93. any good Triode 6H8C preamp schematics out there???
  94. pushpull 6aq5 distortion
  95. Mr. Lian 845 SET more kit rather than commercial product.
  96. Opinion for otl ocl headphone amp
  97. Tube-newby wanting to make a good tube amp
  98. Anyone used a voltage tripler PS?
  99. Audioromy 828A / FU-29 tube layout
  100. Choosing Cathode Bypass Capacitor
  101. Ground loop gremlins
  102. Crackling Amp after Accident
  103. New CCS/ depletion mode MOSFETs available... experience anyone?
  104. Mengyue Mini
  105. Parafeed quest
  106. Determining linearity - differential gain stage
  107. 6HB6 - Any pratical experience?
  108. 27 Tube Preamp design questions
  109. Output Transformers Mount Position
  110. Critique please: Fixed bias 7591 SE
  111. Coupling Cap Improvements?
  112. RL 12T 15
  113. Tube instead of anode resistor
  114. HELP!! Terrible 50Hz hum in Mullard 10W DIY amp
  115. My New 45 SET (choke-loaded 6SN7, direct-coupled)
  116. Hf31 fidelity valve type
  117. Design of transformers for valve amplifiers.Part2
  118. Harman Kardon ta5000X alignment/manual
  119. Help with an analog meter hack
  120. dirkwright phono
  121. Zener Voltage Regulator
  122. Fisher X-101-B Substitute for 7591
  123. UNU-pnono riaa mm preamp
  124. My old amps
  125. Switching regulator on Kickstarter
  126. my yaqin 100b will not bias on v1 v3
  127. Zenith model B835R
  128. Want to build 2a3 amp for old radio
  129. Preamp Advice
  130. simple 5687 pre amp help
  131. Pulling TV From 61 Maggie Imperial Console?
  132. I can buy some 6U9's cheap - are they any good, and what could I build?
  133. K8011/K8010 PCB build thread
  134. Choosing an op point when using a tube 'off label'
  135. Choke inputs
  136. Unbalanced In > Balanced Out line amp - How To Do It?
  137. 6146b output transformer. I'm new and I need help.
  138. Your first DiY Low Cost/Low Voltage tube AMP
  139. Need some advice on OPT for kt88/6l6
  140. 1:1:1 transformers
  141. Output transformer in the cathode?
  142. Popping DC
  143. Power transformer wiring issues
  144. easy question - Magnavox 86-01 owners...
  145. Mic preamp input transformer alternative?
  146. What's the Best Way to Reduce Gain in a Preamp
  147. safety with high voltage input capacitor ?
  148. SE EL84 amp - reducing 100Hz hum
  149. Photos of large DHT preamps? (Or large amps in general)
  150. Minimum pin length (noval)
  151. Biasing of KT120
  152. SE to balanced transformer
  153. Decoupling Cap value - How Much?
  154. Cathode bypass Cap vs. No Bypass Cap
  155. Interesting circuit I thought.
  156. Yet another K12G thread
  157. 6N3 tube preamp question
  158. Driver vs Power tube
  159. Help in Bias tube amp for Adis Devy 7
  160. Tubes and HT
  161. HiFiMan EF-2A schematic sought
  162. Please, help with a WE91 project on behalf of a friend
  163. Proposed Headphone Amp Overhaul?
  164. protection of downstream line amp
  165. Is the 6E6P suitable for audio?
  166. me clone proto EL/PL 504
  167. Improving headphone amplifier
  168. 5902 LSTPICE Model
  169. Canary CA-301 PSU
  170. 3B28 oscilator
  171. A lot of schematics
  172. V8 amp
  173. market by Jac music
  174. 6P3C-1 SE ? .
  175. Cary slp70: Worth to upgrade?
  176. Hickok 123B tube tester
  177. Adding NFB makes headphone amp sound AWFUL!!!
  178. Filaments hard wired to B+ on EZ81 base
  179. What the bird is OS 18/600?
  180. ccs 10m90s what is wrong?
  181. Topology for balanced preamp
  182. 6v6 vs. 6l6 vs. 807 soundwise..
  183. Opinions/Advice on Triode Strap method
  184. Something like a Miniwatt N3 or APPJ PA0901A
  185. Extraordinary harmonics. Type 47 # tube amp.
  186. Made a new tube amp, 6J5 +27 +45
  187. Anyone ever play around with a GU-72?
  188. Possibility of using a UTC LMI-500 transformer...
  189. Aikido transformer
  190. Can someone explain why you need to re-adjust the balance on a tube amp every time
  191. Which factory made these tubes ?
  192. 813 and gm70
  193. 13E1 Push Pull
  194. dump find.
  195. ...6SN7GT operating points tube help.......
  196. 6L6 6SJ7 Amp please pick faults if any
  197. Updated DIY EL34B 6SJ7 SE Amp
  198. 6C18 x 6C33
  199. Vintage tube amp find
  200. any benefit to screen-grid drive a 6V6?
  201. Brown face Scott LK72
  202. Pilot 1060 integrated - make it better!
  203. Should I ground my K12G or my Bugle 2?
  204. 6c33 amp convert to 6c41
  205. STA-LEVEL thumbs problem
  206. Amp motorboating at power up
  207. Spice models for AL4 and RS242 tubes
  208. Mains Switch
  209. Suggestions for big output stage needed
  210. Very Good (or best?) 12B4 schematic?
  211. Amplifier for active bookshelf speakers
  212. Olson AM-240 schematic needed
  213. Valve amp - maintenance
  214. Your opinion about Rotel 930AX to hyrbid mod
  215. Weston Tube Tester 774-5
  216. Tube circuit sim software for free?
  217. 6v6 family tubes
  218. Troublesome bias resistor, cathodyne stage
  219. 6AQ5 excellent for line stage?
  220. Datasheet 6P42s and 6P45C
  221. Quad / Cyrus impedance matching
  222. Zobel network at primary audio trafo?
  223. ECL86 question
  224. 500c buzzing power transformer
  225. LM4702+6L6GB/807
  226. TubeAudio Mixer Blog
  227. Finally started on my 6L6 amp. Need tube suggestions.
  228. Just another Scott thread
  229. Design for overdriven output stage
  230. Seeking Articals On Audio Transformer Design & Construction.
  231. Bias el34 pp
  232. Photo Gallery.
  233. Precision S35
  234. 6L6WGB
  235. 6BQ7A Driver
  236. Advise for Simpson 340 signal generator problem
  237. Armaco TTHF or Calrad AP 15 What to do What to do?...
  238. Screen Power and Warmup
  239. Wanting copies of Prof. Alexander Bereskin's transformer winding pictures.
  240. what's the brand of this capacitor sounds great ?
  241. Edcor CXSE25-8-3.2K or Transcendar TT-017-OT?
  242. PP 2A3 Fixed Bias
  243. RL12P35 convert to el34
  244. Statistical regulator from VA 4rd edition
  245. Matching Impedances (the Math behind it) Please Advise if you have a grasp. Xfmrs etc
  246. Help 6AQ5 pushpull
  247. HV Logic Control Approach
  248. Valve heater question
  249. Phase inverter adjustment - Fisher 80AZ
  250. Repurposing a Bogen CHB-35A

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