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  1. Amplifier using a 833A
  2. Circuit help
  3. How much mis-match can an OT take?
  4. SE load mismatch, 8 or 6 or 4 ohms?
  5. Magnavox 196-BA => RH 84 conversion
  6. Capacitor voltage ratings
  7. 40W class A push pull amp with JJ 2A3-40w possible?
  8. "Designing tube preamplifier" article
  9. Valve Tester Guru Help
  10. 6GB5 and Variants as Screen Driven Amps
  11. Gyrator Question
  12. Suggestion Please - Curcuit Simulation & PCB Design Software
  13. Starting to understand.....
  14. Aureavox Arcana 81
  15. Impedance question
  16. spare transformer wires?
  17. Capacitors and maximum voltage ratings
  18. Do Sweep tubes Glow Blue?
  19. Any way to upgrade this circuit? (V. 40's phono amp.)
  20. About tube "matched pairs"
  21. Testing Gm without tube tester
  22. Best place to get Shuguang 300B tubes
  23. Old metal tubes
  24. LTSpice Simulation template?!
  25. 300B pushpull- A new schematic
  26. Drake transformer
  27. TL Audio VP-5051 Valve voice processor
  28. Vtl 750
  29. DC-coupling of tube stages
  30. ThermalTrak transistor application.
  31. weird old amp:need help
  32. Triode Electronics Mark III
  33. Scavenging a broken oscilloscope to turn it into a preamp ?
  34. Silmic caps in cathode bias. Any experience?
  35. Scott LK150 transformer
  36. With the Simple SE I lost 20lbs w/o diet or excercise and I feel great!
  37. Tube Amp / Pre-amp kit?
  38. anything that can go as a Rp.....
  39. Genelex gold lion el84 reissue - ARCING
  40. diy Ampeg preamp
  41. Bias Current Mythbuster?
  42. Exactness of feedback capacitors?
  43. 5608a
  44. You know that you are having a bad day when.......
  45. 1U5 amplifier design, Newbie
  46. 12AU7 Pre-amp Schematic Question
  47. Capacitor Question...
  48. Beam pentodes and suppressor-grid pentodes of same type
  49. Quick question about CT and FWB
  50. 46 and the Tubelab SE
  51. Frank's 6SN7 line stage / preamp with GlassWare PS-1?
  52. knobs, lights and switches?
  53. SimpleSE OP Hammond bigger than the 125ESE
  54. Speaker impedance linearisation
  55. Differential filter circuit: biasing problem
  56. Curves for 12AH7
  57. Schematic for Audio Note Japan Kassai
  58. Help with schematic understanding
  59. SEPP output transformer
  60. Fixed bias design question
  61. Strange bias circuit. WTF?
  62. 5687 preamp transformer
  63. Anyone know of a dual pentode suitable for a LTP.
  64. Output transformer current and power ratings
  65. Diodes to protect OT's..
  66. Simple SE: ???Dumb Tube Rectifier question???
  67. Speakers for tube amps
  68. Help on power supply
  69. Line output transformer question
  70. Solid vs stranded wire in amplifier circuits
  71. Screen Drive Push Pull ideas
  72. 12AT7/46 Direct Reactance Drive Amp
  73. Bridge rectifier vs Full wave rectifier
  74. Isolation Transformer Question
  75. Glow tubes as series regs ?
  76. Glow tube shunt reg stability
  77. Some interesting reading about Sweep tubes
  78. What is this?
  79. What's A "Timber bulb"?
  80. aikido/807PSE and local feedback
  81. Repairing paper in oil caps.
  82. Optoisolator compressor ideas
  83. Airgap for filament transformer ?
  84. Tube stereo for E 60 including TDA1541 cd player
  85. Bad Boy amplifier Tubelab.com style
  86. is there a typo in the Tubelab SE schematic?
  87. Theta Amp problem
  88. 12A_7 vs 6SN7EH vs EF86?
  89. Mixing two channels in the preamp or at the phase splitter?
  90. amp input cap for crossover
  91. Audio Transformer/Cathode Feedback Info
  92. Determining cathode resistor
  93. Tube Pin Schematic Question
  94. Simple SE blowing fuses
  95. Best looking tube?
  96. Identifying Stancor Power transformers
  97. HT crowbar
  98. "Bevois Valley" in triode, what to do with the feedback?
  99. Purple Glow
  100. When to use a grid leak resistor?
  101. Mcintosh MA 2275
  102. Marshall 18W clone (sort of)
  103. Cathode feedback on the simple SE
  104. Blowing output transformer
  105. Kenwood KW-44 hum
  106. Tube system for classical audio
  107. Novel method to reduce filament hum in SE Amp?
  108. Help with 6SN7 w/ CCS
  109. Fisher X-101-D
  110. best tube (not amp)
  111. Simple SE Cap and layout questions???
  112. Simple SE - one channel intermittent problem
  113. ML4/ML6 British triode
  114. transformer rubbish
  115. Identifying output transformer leads
  116. Grounding Aikido and F4
  117. Determining ratings for unknown Power Transformers
  118. Tube heaven - or tube hell?
  119. Fender "Evil Twin" Hi/Low output = same level
  120. Sub amp/speaker to compliment S5 electronics K 12 G tube amp
  121. Troubleshooting hum in 12b4 preamp.. finally almost done!!
  122. SE cathode bias question
  123. k-12G / K-12M with 4 Ohm speakers
  124. About united electron tube
  125. 6c33c-b & 6c33c-v
  126. would like a substitute for Sowter 3575-C
  127. My first tube project WIP
  128. Tube rectifiede +- supply...
  129. the buzzing from amplifiers
  130. MC prepre with submini tubes
  131. 12AU7 Preamp build
  132. Bias/ Plate dissipation question
  133. Has anyone screen driven an EL84?
  134. tube pre amp for phone stage
  135. 6080 se cathode follower
  136. Amplifier suggestions for EPA OPT please
  137. Which tube? How much power can it produce?
  138. Graaf GM20 mods - help!
  139. xpp amplifier question
  140. 520v in PP UL...?
  141. New ST-70 blowing 3 amp slow blow fuse
  142. Was There a Heathkit W-1M or WM?
  143. 8ohm speakers 4ohm tap
  144. Upgrading the Conrad Johnson Premier Fourteen preamp
  145. Noob's first build !!!!
  146. 6sf5gt ??
  147. Measuring technics practical, the allaround reference method?
  148. 2A3 or KT88 ?
  149. What to build with these tubes?
  150. line output transformer help
  151. 6L6GC Options and Flavors
  152. Chinese Buffer Amp, Useful?
  153. 6C33C SE Amp - Ideas on refinement?
  154. 6BM8 Equivalent
  155. Newbie wants to rebuild a Stromberg Carlson ASR-433
  156. RH84 questions
  157. VTL Manley 807 push pull ultra linear
  158. Seeking Pentode-Triode with a 12AX7 half...
  159. Modern tube amplifier designs?
  160. 6n6p transformer output impedance
  161. 814 triode curves
  162. Bias Question
  163. Building a variac
  164. Is my 300B tube dead?
  165. One channel quiet - any bright ideas?
  166. Saw them coming (stupid prices on ebay)
  167. EL36/6CM5 pp design critique
  168. Driving Raven R2 with tubes
  169. Does Anyone Know What This Is?
  170. Need help with tubes problem...
  171. 6V6GT push pull NFB resistor value
  172. Power cord for single ended triode
  173. Virtual chokes
  174. 12AU7 based preamp hums when output cable is touched!
  175. Possible Test equipment find.
  176. 6ak5-45
  177. Using coax for signal wiring?
  178. Chassis Plate Finish
  179. Schade84
  180. Fisher 800c selenium rectifier pictures
  181. Bass amp from spare parts
  182. Looking for tips on operating points for tubes in anode follower ...
  183. Transformer in the cathodes ??
  184. Fisher 800c static,crackle
  185. 19J6 replacement
  186. Newbie tube buffer kit
  187. Simple se parts, all needed?
  188. Any recommendations for tube for vari-mu compressor?
  189. AMC CVT 3030 Bias Procedure
  190. Cascading volumes on a 5C3 amp
  191. Anyone used a edcor cxpp100-ms-5k OT
  192. Noisy gain boost
  193. Troubleshooting hum issues with batteries?
  194. Rectifying Heater Supply
  195. tube heater over voltage!please help...
  196. rca 829b bias ? Audioromy 828
  197. 10k winding, 100k pot
  198. What is the definition of a 'good tube'?
  199. 3-stage DC-coupled Ampl
  200. 1946 Philco Tube Receiver
  201. A New Source for James Transformers
  202. Edcor Site Down? Gone? anyone know anything?
  203. Please suggest practical DIY uses for these BIG oil caps
  204. How to calculate DRD amps..
  205. PL-519 Tube - Tell me more please...
  206. Need ideas for amp with 2A3, One Electron UBT-3
  207. Favourites discrete brand for tube amp
  208. Pharmicia EPS500/400 Power supply - tube use
  209. Black Art Audio
  210. 12AX7/12BH7 Hammond Tube Preamp Project
  211. Dampen transformer endbells?
  212. Do I have DC on my AC line?
  213. GM-70 cathode feed SE amplifier
  214. Rogers cadet mk 2 newbie project experience required
  215. Mcintosh amps transformer rewinding, help needed please!
  216. Using an output tranny from a stereo for a single-ended amplifier ?
  217. 6336A Single Ended.
  218. UA 175 Urei 175
  219. Morgan Jones 5842 RIAA
  220. Question about current ratings of Hammond 300 series power transformers.
  221. Cathode Windings
  222. Phono stage for 12B4 amp [from previous thread]
  223. Looking for schematic of 26 WOT Preamp
  224. Transformer Lam Questions
  225. Schottky diode bias
  226. ACROSOUND direct-couple EL84 amplifier question
  227. RH807 CCS loaded
  228. Audio Note Kit 1 PSU question
  229. B&K 500 Tube Tester Calibration
  230. New kt88's or 6550
  231. Bias Supply resistors
  232. Incredible source for used transformers and parts!
  233. Reclaimed Hammond H100 PSU's
  234. Arc Vt-60 Cloned :-)
  235. First Time Pre Amp Build
  236. Tubelab SE 300B low level hum, help
  237. 845 - Progress so far
  238. Nube challange12AX7 to drive 6C4
  239. 7th harmonic distortion from PP pentodes depends on bias?
  240. West Output Transformers?
  241. Help me design my DAC/Line Preamp.
  242. Hybrid preamp tube problemHi,
  243. sweept tubes for simple Se recommendation?
  244. Building RH84 SE tube amp.
  245. Question - THD Measrement/Spectrum Analyzis
  246. What to do with TMC tube radio gear?
  247. Easy & Safe & Good sounding gainclone tube buffer
  248. Compactron (31AL10) Head-Scratcher
  249. blackfacing a twin
  250. What cable do you use from input socket to volume pot

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