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  1. The Mullard 3-3
  2. Audio Research D125 Schematic?
  3. Glass B1. Need advise
  4. Eagle Library for OPT?
  5. Computing or measuring anode curves w/ CFB
  6. Northlake PT ??
  7. Greatest circuit ever (or weirdest)
  8. Advise for nervous EL84 user
  9. K-12G problems
  10. Changing AC heaters to DC
  11. Phase change when adding gain stage?
  12. XiangSheng Amplifier
  13. Grid stopper resistor for 12B4A?
  14. Lundahl LL1620 SE-OPT : Ultra linear ?
  15. Thordarson transformers
  16. Ampeg SVT cloners, chime in!
  17. Electra Print & SAC ( Silk )?
  18. Audio Transformer articles I would like copies of !
  19. K-12 with headphones?
  20. cap wire lead covers
  21. Single ended amp, EL34, KT88 ideas??
  22. Kt-66 and Simple SE
  23. Wavebourn Pyramid - VII driver stage
  24. Mysterious OPT winding tap
  25. DHT…. Get rid of the Hum Pot!
  26. Operating Amp Without Load
  27. Tube choices for Simple SE?
  28. Looking for information on old thread
  29. Tube Leveling Amplifier
  30. Anyone with knowledge of the 12b4?
  31. 7695...useful audio tube??
  32. simple se blowing rectifier and fuse
  33. PSUD - How do interpret the results?
  34. Solder station
  35. TubeLab SE blowing fuse on B+ ramp up
  36. preamp for pl504 amp
  37. Resistor after volume pot
  38. 6021 Amp project..looking for some input
  39. 807 SE project started....
  40. Fun with glow tubes, a success story
  41. OPT question
  42. Sources for Replacement Fender Filter Caps
  43. Cheap and easy vacuum impregnation
  44. How to measure mains waveform safely?
  45. Wanted - High Power, High Voltage, Audio Frequency Transformer Manual.
  46. Aikido Resistor Help
  47. Changing 6SQ7 to 6SL7 in SE amp
  48. Multi-tap OT
  49. harmon kardon a700 amp output trafo impedance
  50. An SE 813 OPT?? SP. Wound??who zat?
  51. Tube rectifier to diode
  52. The Trioderizer
  53. increasing coupling capacitor value in we 91
  54. diy SE Tube Amp
  55. Max power possible from 6L6 with 6.6k load?
  56. OPT grounding question
  57. Tubelab sse transformer wires
  58. SE sound vs Ultra Linear sound
  59. Modify & build out (2) Western Electric 300B / 2A3 Hammond monoblock amps & UTC LS-5
  60. 6N6P or E182cc spice
  61. Ecl82
  62. Zeiss Ikon Dominar L Amplifier
  63. Beginners attempt at SE 6EM7
  64. Changing 300B Tubelab SE to accomidate 50 triodes
  65. Subbing a 5751 with a 5755
  66. HELP repair a Yamaha T100C combo
  67. Sophia Electric 300B tube
  68. Screen drive and other P-P experiments
  69. Amplifier using a 833A
  70. Circuit help
  71. How much mis-match can an OT take?
  72. SE load mismatch, 8 or 6 or 4 ohms?
  73. Magnavox 196-BA => RH 84 conversion
  74. Capacitor voltage ratings
  75. 40W class A push pull amp with JJ 2A3-40w possible?
  76. "Designing tube preamplifier" article
  77. Valve Tester Guru Help
  78. 6GB5 and Variants as Screen Driven Amps
  79. Gyrator Question
  80. Suggestion Please - Curcuit Simulation & PCB Design Software
  81. Starting to understand.....
  82. Aureavox Arcana 81
  83. Impedance question
  84. spare transformer wires?
  85. Capacitors and maximum voltage ratings
  86. Do Sweep tubes Glow Blue?
  87. Any way to upgrade this circuit? (V. 40's phono amp.)
  88. About tube "matched pairs"
  89. Testing Gm without tube tester
  90. Best place to get Shuguang 300B tubes
  91. Old metal tubes
  92. LTSpice Simulation template?!
  93. 300B pushpull- A new schematic
  94. Drake transformer
  95. TL Audio VP-5051 Valve voice processor
  96. Vtl 750
  97. DC-coupling of tube stages
  98. ThermalTrak transistor application.
  99. weird old amp:need help
  100. Triode Electronics Mark III
  101. Scavenging a broken oscilloscope to turn it into a preamp ?
  102. Silmic caps in cathode bias. Any experience?
  103. Scott LK150 transformer
  104. With the Simple SE I lost 20lbs w/o diet or excercise and I feel great!
  105. Tube Amp / Pre-amp kit?
  106. anything that can go as a Rp.....
  107. Genelex gold lion el84 reissue - ARCING
  108. diy Ampeg preamp
  109. Bias Current Mythbuster?
  110. Exactness of feedback capacitors?
  111. 5608a
  112. You know that you are having a bad day when.......
  113. 1U5 amplifier design, Newbie
  114. 12AU7 Pre-amp Schematic Question
  115. Capacitor Question...
  116. Beam pentodes and suppressor-grid pentodes of same type
  117. Quick question about CT and FWB
  118. 46 and the Tubelab SE
  119. Frank's 6SN7 line stage / preamp with GlassWare PS-1?
  120. knobs, lights and switches?
  121. SimpleSE OP Hammond bigger than the 125ESE
  122. Speaker impedance linearisation
  123. Differential filter circuit: biasing problem
  124. Curves for 12AH7
  125. Schematic for Audio Note Japan Kassai
  126. Help with schematic understanding
  127. SEPP output transformer
  128. Fixed bias design question
  129. Strange bias circuit. WTF?
  130. 5687 preamp transformer
  131. Anyone know of a dual pentode suitable for a LTP.
  132. Output transformer current and power ratings
  133. Diodes to protect OT's..
  134. Simple SE: ???Dumb Tube Rectifier question???
  135. Speakers for tube amps
  136. Help on power supply
  137. Line output transformer question
  138. Solid vs stranded wire in amplifier circuits
  139. Screen Drive Push Pull ideas
  140. 12AT7/46 Direct Reactance Drive Amp
  141. Bridge rectifier vs Full wave rectifier
  142. Isolation Transformer Question
  143. Glow tubes as series regs ?
  144. Glow tube shunt reg stability
  145. Some interesting reading about Sweep tubes
  146. What is this?
  147. What's A "Timber bulb"?
  148. aikido/807PSE and local feedback
  149. Repairing paper in oil caps.
  150. Optoisolator compressor ideas
  151. Airgap for filament transformer ?
  152. Tube stereo for E 60 including TDA1541 cd player
  153. Bad Boy amplifier Tubelab.com style
  154. is there a typo in the Tubelab SE schematic?
  155. Theta Amp problem
  156. 12A_7 vs 6SN7EH vs EF86?
  157. Mixing two channels in the preamp or at the phase splitter?
  158. amp input cap for crossover
  159. Audio Transformer/Cathode Feedback Info
  160. Determining cathode resistor
  161. Tube Pin Schematic Question
  162. Simple SE blowing fuses
  163. Best looking tube?
  164. Identifying Stancor Power transformers
  165. HT crowbar
  166. "Bevois Valley" in triode, what to do with the feedback?
  167. Purple Glow
  168. When to use a grid leak resistor?
  169. Mcintosh MA 2275
  170. Marshall 18W clone (sort of)
  171. Cathode feedback on the simple SE
  172. Blowing output transformer
  173. Kenwood KW-44 hum
  174. Tube system for classical audio
  175. Novel method to reduce filament hum in SE Amp?
  176. Help with 6SN7 w/ CCS
  177. Fisher X-101-D
  178. best tube (not amp)
  179. Simple SE Cap and layout questions???
  180. Simple SE - one channel intermittent problem
  181. ML4/ML6 British triode
  182. transformer rubbish
  183. Identifying output transformer leads
  184. Grounding Aikido and F4
  185. Determining ratings for unknown Power Transformers
  186. Tube heaven - or tube hell?
  187. Fender "Evil Twin" Hi/Low output = same level
  188. Sub amp/speaker to compliment S5 electronics K 12 G tube amp
  189. Troubleshooting hum in 12b4 preamp.. finally almost done!!
  190. SE cathode bias question
  191. k-12G / K-12M with 4 Ohm speakers
  192. About united electron tube
  193. 6c33c-b & 6c33c-v
  194. would like a substitute for Sowter 3575-C
  195. My first tube project WIP
  196. Tube rectifiede +- supply...
  197. the buzzing from amplifiers
  198. MC prepre with submini tubes
  199. 12AU7 Preamp build
  200. Bias/ Plate dissipation question
  201. Has anyone screen driven an EL84?
  202. tube pre amp for phone stage
  203. 6080 se cathode follower
  204. Amplifier suggestions for EPA OPT please
  205. Which tube? How much power can it produce?
  206. Graaf GM20 mods - help!
  207. xpp amplifier question
  208. 520v in PP UL...?
  209. New ST-70 blowing 3 amp slow blow fuse
  210. Was There a Heathkit W-1M or WM?
  211. 8ohm speakers 4ohm tap
  212. Upgrading the Conrad Johnson Premier Fourteen preamp
  213. Noob's first build !!!!
  214. 6sf5gt ??
  215. Measuring technics practical, the allaround reference method?
  216. 2A3 or KT88 ?
  217. What to build with these tubes?
  218. line output transformer help
  219. 6L6GC Options and Flavors
  220. Chinese Buffer Amp, Useful?
  221. 6C33C SE Amp - Ideas on refinement?
  222. 6BM8 Equivalent
  223. Newbie wants to rebuild a Stromberg Carlson ASR-433
  224. RH84 questions
  225. VTL Manley 807 push pull ultra linear
  226. Seeking Pentode-Triode with a 12AX7 half...
  227. Modern tube amplifier designs?
  228. 6n6p transformer output impedance
  229. 814 triode curves
  230. Bias Question
  231. Building a variac
  232. Is my 300B tube dead?
  233. One channel quiet - any bright ideas?
  234. Saw them coming (stupid prices on ebay)
  235. EL36/6CM5 pp design critique
  236. Driving Raven R2 with tubes
  237. Does Anyone Know What This Is?
  238. Need help with tubes problem...
  239. 6V6GT push pull NFB resistor value
  240. Power cord for single ended triode
  241. Virtual chokes
  242. 12AU7 based preamp hums when output cable is touched!
  243. Possible Test equipment find.
  244. 6ak5-45
  245. Using coax for signal wiring?
  246. Chassis Plate Finish
  247. Schade84
  248. Fisher 800c selenium rectifier pictures
  249. Bass amp from spare parts
  250. Looking for tips on operating points for tubes in anode follower ...

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