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  1. Front-end topologies for PP
  2. tranformers
  3. How many LesBox units exist out there?
  4. Old Sylvania black-plate bent getter 12au7s
  5. Phono / pre amp section schematic suggestions
  6. 4P1L in parallel Single Ended
  7. Pair of Ampex 620 amps
  8. My SE 6S4S
  9. chinese ebay 12au7 + 6dj8 white cathode follower preamp boards?
  10. "chirp" when power up amplifier
  11. Modified Dynaco PAS Phono
  12. Filter Chokes wired for CMR
  13. Capacitors / K12G Tube Amp
  14. Sansui SM-30
  15. RCA Phono Preamplifier with 12ax7
  16. separate filament transformer for 5u4g?
  17. EL34 Triode strapped amplifier
  18. Testing emission without risk
  19. Anyone Build the Borbely 15W 6C33C SE?
  20. Cheap and upgradable preamp
  21. Source for least expensive tubes.
  22. 5 Pin Tube Socket Suggestions Please
  23. UXCV-11 plates?
  24. Top 5 Most Popular Tube Base
  25. 6C33C and Computer PSU
  26. Output transformer impedance for a 4P1L PSE
  27. Specs of old output transformer
  28. altec 1570b
  29. Mixed tube and ss stages grounding. Best practice?
  30. Any news from Tribute?
  31. What are this....a tube or lamp or etc?
  32. duff tube? Little Bear P1
  33. Opinion on amp build
  34. K12G For Mom & Dad
  35. RIAA Network Position
  36. 6k5GT - Good Tube Curves?
  37. 5902 pentode datasheet confusion
  38. Hum in one channel on Headphone Amp
  39. KT24 datasheet, help !!!
  40. Chicago Standard Transformer Company OPT's
  41. Help on repairing messed up AMC CVT3030
  42. Anyone traced triode curves for the 6CZ5?
  43. anthem pre-1
  44. split supply for tubes
  45. Rufus p. Turner AC-DC amp
  46. 1937 Philco Radio Amp - Build Thread
  47. Transformers for valve headphone amps
  48. Help with negative feedback
  49. Silicon Diode Measurement Confusion
  50. grommet against vibrations
  51. Help with a Moscode 300
  52. Help Identifying Valve Amplifier
  53. capacitors
  54. Questions about console parts salvaging
  55. Regarding EDCOR Transformer Data
  56. PYE mozart
  57. Tube swapping with my Condensor Mic
  58. found amp - identity unknown
  59. how to low the gain
  60. VTL TL-2 tube preamp
  61. Need Advice for Bi-amping
  62. Baldwin organ amp
  63. Octal Aikido with gain/buffer switch?
  64. Harman Kardon Stereo Tube Amp Oscillator Help!
  65. Electro-Harmonex 6973 Question
  66. Power and plate current in a SE amp
  67. 6883B for use as a audio output tube
  68. "Distortionless" Tube Oscillator -Cutting Edge Technology
  69. Feedback RH84 6v6
  70. copper wire from socket bolts to exhaust tip?
  71. What KT88 brands can handle high B+ triode connected?
  72. Williamson-style circuit with Schade feedback using pentode driver stage?
  73. potentiometer for blackface deluxe reverb
  74. GM70 tube copper vs graphite plate???
  75. +/-floating tube PSU for guitar ?! Schematic error ?
  76. About Dark Heater Tubes.
  77. Sylvania 5692 Black base tubes
  78. Tube Tester in Montreal
  79. tubelab.com's super tube SE
  80. Unsual use of triode?
  81. What the hell is Class A3 ?
  82. High voltage triodes (true triodes)
  83. Ceramic Filter Selection
  84. Eagle library for CMC teflon 9-pin tube socket?
  85. Power supply mosfet vs choke filter
  86. Capacitors used in Conrad Johnson PV7
  87. HH Scott 299A center out to subwoofer
  88. PP Amplifier Advice Sought: EL34/KT88 UL/Triode
  89. Search for StepUp 12V->142V @ 6mA
  90. Magnavox 8802 upgrade suggestions?
  91. filament supply using two bridges
  92. 6N2P-EV gain factor ??
  93. Talking tube replacements
  94. Audi Institute VR70E amp
  95. Share Fixed Bias using Diodes
  96. Finished my Tube DI/Preamp
  97. Arcturus Blue Tubes
  98. share your experience on sound of hybrid amps
  99. ideas for a simple ECL82/86 p-p amp?
  100. Tube replacements or substitution
  101. 12ax7 / 12au7
  102. Triode/Pentode Loadline Calculator
  103. Troubleshooting a Fender Champion 600
  104. High Voltage Derived Bias Supply
  105. Universal hybrid triode-mosfet input/drive stage
  106. IT coupled 1624 or 807 amp
  107. Raytheon / Western Electric JW-5755 / 420A
  108. Calculate unknown operating point from known cathode resistor
  109. 5763 triode curves
  110. HICKOK 539a QUESTION
  111. Constant current heaters
  112. max G2 voltage 1624 tube (Tabor)
  113. Need reference for Dynaco MKIV amp build
  114. Biasing Valve on Bipolar Power Supply
  115. Tubelab sse choke input 6v6
  116. $1800 tube amp
  117. Testing a 6N3 5670 etc on a B&K 600 tester
  118. Could anyone shed any light on this amp for me?
  119. Translation Russian EL84SE design please?
  120. Determining plate and screen voltage
  121. I Don't want to set the forum on fire . . .
  122. Valab Ultra Low Noise Regulatible
  123. Westinghouse 6973 Tube
  124. Which is worth burning or keeping
  125. OPT position
  126. Remove volume pot
  127. Headphone amp ideas?
  128. Good Looking 6SN7
  129. UTC Transformer
  130. Cap substitution help
  131. Edcor replacement for w5m peerless opt
  132. Audyn True copper caps.
  133. No Feedback Balanced Line Design
  134. KT120 PP - "low power" baptized Vitruvian amplifier
  135. Senior Design Project
  136. Hovland Sapphire guidance needed
  137. Question about specialized OPT
  138. My first build tubelab SE
  139. k16ls tube amp on/off switch?
  140. SY Tube Phono Improvements?
  141. Tube newbie, anyone familar with s-5 k-502? Help needed please
  142. TVA-1 Michaelson & Austin with problems
  143. New to HIFI tube need advice
  144. Crosstalk between Triodes in Dual Triode Tubes
  145. 6L6GC instead of EL34
  146. Schade feedback and CFB
  147. Sansui AU-70 - Help Needed
  148. Pentode C.F, where to connect the suppressor grid ?
  149. Separate PSU for PP EL34 / 6SN7GT integrated amp
  150. Simple SE driver with mosfet (6sn7/307A) IRF820
  151. Is it safe to run pentode w/ no screen voltage for a min?
  152. Low B+ and CCS question
  153. Has anyone ever used slate in audio?
  154. Semi-Fixed Bias?
  155. Transformers MIC and Phono
  156. Russian capacitor markings
  157. 6L6GC...More Voltage...or More Current?
  158. help me
  159. Anybody built/heard Melquiades amp
  160. Elevated grid bias
  161. Oscillation found in Luxman LX33
  162. RCA phono amp project
  163. Test of 45 Triode with EICO 625?
  164. Standard Silicon Diode Rectifier's VS Ultra Fast
  165. Output Transformer for L3 pre Audio Note
  166. "Boosted" Triode operation?
  167. 6HB6 UL push pull amp
  168. Interstage transformer ratio, spacecharge tubes in PP
  169. 6N6P line stage
  170. Revamping Tube Amp Monoblock - capacitor grounding concern
  171. 845 set bias.
  172. How to improve on a working Hybrid Amp: 832A Tube with MOSFETs
  173. tube outputs
  174. Coupling Cap Consistency
  175. Volume adjustment on 8ch at once
  176. Sub minature tube gain stage question.
  177. DHT PSE 2A3
  178. Plate voltage mic pre
  179. Estimating load for Duncan Amps PSU tool HOWTO?
  180. Shuguang Treasure Series 300B-Z not satisfactory!
  181. Choosing OP of small signal tubes with CCS in the cathode
  182. Aikido help needed
  183. Exploding 300B
  184. power output of EL34
  185. 76tube into C3M (triode) via LL1660 to PP outputstage
  186. best operating points for e182cc tube
  187. Any thoughts about this volume/bal arrangement
  188. Filament tension spring material
  189. DC coupled SE SChade amp
  190. First build 6V6 based
  191. Failed Converting UL to Pentode!?
  192. 1955 kids record player hum puzzle
  193. subwoofer output from my tube preamp
  194. EL84 SE Amp - specific transformer
  195. "GOOD" backup KT-88
  196. New or Old Output Transformer?
  197. Motorola console recap question
  198. Plate voltage on preamp tube too high
  199. Good valve design calculator website
  200. Ultra-on push-pull tetrode 6550
  201. My introduction to tube amps. The good, the bad, and the ugly.
  202. How do I calculate local feedback %?
  203. Newbie greeting & Resource
  204. Tips/Help With a Dying OTL Headphone Amp
  205. 6B4G and ECC83
  206. Maron buys a tube amp
  207. Newbie
  208. 845 AC filaments, my experience
  209. 8552 finals ?
  210. Low voltage 3W S.E. little amp, need comments and suggestions
  211. Single ended push pull ultra linear or?...
  212. Hello and questions about Magnavox SE amp
  213. Amp identification
  214. Millett DCPP No Output.
  215. using a Hammond 835 interstage ?
  216. Recommendation on versitile tube tester
  217. Mullard 6SN7GT
  218. RIAA tube pre amp
  219. Cheapo Ebay voltmeter
  220. Jolida SJ202a Schematic
  221. Tetra All in One Phono Preamp voltage
  222. Console pull advice
  223. Local feedback on IT secundary (PP amp)
  224. Computerized Curve Tracer Project
  225. Is 6w enough and can i use phone power amp?
  226. Yaqin MS-12B preamp - how to get more gain?
  227. Inductor Multiplier Patent
  228. KT90
  229. 6L6GC Hybrid Partial Feedback
  230. 7868 to 7591a conversion help
  231. SOS! 21st Century Regulator Dead!
  232. Transformer Placement - To shield or not to Shield
  233. cap multiplier suggestions wanted
  234. Bridging stereo tube amp to one more powerful mono output
  235. Weird pentode connections
  236. My last S.E. amplifier (pentode driver + Beam Power Tube Ultralinear mode)
  237. Please help info UTC transformer
  238. ARC SP-6B Tube Heaters Glow Very Bright at Startup
  239. SUPER budget DIY tube amp - need help
  240. LEAK TL/12
  241. What decides gain of a valve stage ?
  242. 6AH4 Preamp..A great option for line stage
  243. Kondo M77
  244. 2C22 SRPP
  245. Resistor question
  246. Problem with X10-d as preamp
  247. Pilot One AA-410 1950s
  248. Measuring VAC on coupling cap
  249. Tube phono stage load
  250. ANUBIS - Another Tube-Transistor Hybrid Amplifier

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