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View Full Version : Tubes / Valves


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  1. ss rectifier filter recommendate
  2. Determining plate current with non-standard screen grid voltages
  3. allnic hpa-5000
  4. Hodgepodge build
  5. Power Transformer weirdness/wiring problem
  6. Question trafo for Broskie Janus PSU
  7. Copland CVA-306 tube and output capacitor replacement
  8. Choice of Output Transformer
  9. Jumping in with both feet
  10. Large 9pin socket needed
  11. Line-up of old and currently produced RIAA Stages with tubes wanted (like EAR-834)
  12. Question about 6P31S
  13. 6N16B Aikido Cathode Resistors
  14. 1KV umbilical cords.... and other HV issues
  15. 300b Bewitch Amp Blows Fuses
  16. Dynaco ST-70
  17. Front-end topologies for PP
  18. tranformers
  19. How many LesBox units exist out there?
  20. Old Sylvania black-plate bent getter 12au7s
  21. Phono / pre amp section schematic suggestions
  22. 4P1L in parallel Single Ended
  23. Pair of Ampex 620 amps
  24. My SE 6S4S
  25. chinese ebay 12au7 + 6dj8 white cathode follower preamp boards?
  26. "chirp" when power up amplifier
  27. Modified Dynaco PAS Phono
  28. Filter Chokes wired for CMR
  29. Capacitors / K12G Tube Amp
  30. Sansui SM-30
  31. RCA Phono Preamplifier with 12ax7
  32. separate filament transformer for 5u4g?
  33. EL34 Triode strapped amplifier
  34. Testing emission without risk
  35. Anyone Build the Borbely 15W 6C33C SE?
  36. Cheap and upgradable preamp
  37. Source for least expensive tubes.
  38. 5 Pin Tube Socket Suggestions Please
  39. UXCV-11 plates?
  40. Top 5 Most Popular Tube Base
  41. 6C33C and Computer PSU
  42. Output transformer impedance for a 4P1L PSE
  43. Specs of old output transformer
  44. altec 1570b
  45. Mixed tube and ss stages grounding. Best practice?
  46. Any news from Tribute?
  47. What are this....a tube or lamp or etc?
  48. duff tube? Little Bear P1
  49. Opinion on amp build
  50. K12G For Mom & Dad
  51. RIAA Network Position
  52. 6k5GT - Good Tube Curves?
  53. 5902 pentode datasheet confusion
  54. Hum in one channel on Headphone Amp
  55. KT24 datasheet, help !!!
  56. Chicago Standard Transformer Company OPT's
  57. Help on repairing messed up AMC CVT3030
  58. Anyone traced triode curves for the 6CZ5?
  59. anthem pre-1
  60. split supply for tubes
  61. Rufus p. Turner AC-DC amp
  62. 1937 Philco Radio Amp - Build Thread
  63. Transformers for valve headphone amps
  64. Help with negative feedback
  65. Silicon Diode Measurement Confusion
  66. grommet against vibrations
  67. Help with a Moscode 300
  68. Help Identifying Valve Amplifier
  69. capacitors
  70. Questions about console parts salvaging
  71. Regarding EDCOR Transformer Data
  72. PYE mozart
  73. Tube swapping with my Condensor Mic
  74. found amp - identity unknown
  75. how to low the gain
  76. VTL TL-2 tube preamp
  77. Need Advice for Bi-amping
  78. Baldwin organ amp
  79. Octal Aikido with gain/buffer switch?
  80. Harman Kardon Stereo Tube Amp Oscillator Help!
  81. Electro-Harmonex 6973 Question
  82. Power and plate current in a SE amp
  83. 6883B for use as a audio output tube
  84. "Distortionless" Tube Oscillator -Cutting Edge Technology
  85. Feedback RH84 6v6
  86. copper wire from socket bolts to exhaust tip?
  87. What KT88 brands can handle high B+ triode connected?
  88. Williamson-style circuit with Schade feedback using pentode driver stage?
  89. GM70 tube copper vs graphite plate???
  90. About Dark Heater Tubes.
  91. Sylvania 5692 Black base tubes
  92. Tube Tester in Montreal
  93. tubelab.com's super tube SE
  94. Unsual use of triode?
  95. What the hell is Class A3 ?
  96. High voltage triodes (true triodes)
  97. Ceramic Filter Selection
  98. Eagle library for CMC teflon 9-pin tube socket?
  99. Power supply mosfet vs choke filter
  100. Capacitors used in Conrad Johnson PV7
  101. HH Scott 299A center out to subwoofer
  102. PP Amplifier Advice Sought: EL34/KT88 UL/Triode
  103. Search for StepUp 12V->142V @ 6mA
  104. Magnavox 8802 upgrade suggestions?
  105. filament supply using two bridges
  106. 6N2P-EV gain factor ??
  107. Talking tube replacements
  108. Audi Institute VR70E amp
  109. Share Fixed Bias using Diodes
  110. Finished my Tube DI/Preamp
  111. Arcturus Blue Tubes
  112. share your experience on sound of hybrid amps
  113. ideas for a simple ECL82/86 p-p amp?
  114. Tube replacements or substitution
  115. 12ax7 / 12au7
  116. Triode/Pentode Loadline Calculator
  117. High Voltage Derived Bias Supply
  118. Universal hybrid triode-mosfet input/drive stage
  119. IT coupled 1624 or 807 amp
  120. Raytheon / Western Electric JW-5755 / 420A
  121. Calculate unknown operating point from known cathode resistor
  122. 5763 triode curves
  123. HICKOK 539a QUESTION
  124. Constant current heaters
  125. max G2 voltage 1624 tube (Tabor)
  126. Need reference for Dynaco MKIV amp build
  127. Biasing Valve on Bipolar Power Supply
  128. Tubelab sse choke input 6v6
  129. $1800 tube amp
  130. Testing a 6N3 5670 etc on a B&K 600 tester
  131. Could anyone shed any light on this amp for me?
  132. Translation Russian EL84SE design please?
  133. Determining plate and screen voltage
  134. I Don't want to set the forum on fire . . .
  135. Valab Ultra Low Noise Regulatible
  136. Westinghouse 6973 Tube
  137. Which is worth burning or keeping
  138. OPT position
  139. Remove volume pot
  140. Headphone amp ideas?
  141. Good Looking 6SN7
  142. UTC Transformer
  143. Cap substitution help
  144. Edcor replacement for w5m peerless opt
  145. No Feedback Balanced Line Design
  146. KT120 PP - "low power" baptized Vitruvian amplifier
  147. Senior Design Project
  148. Hovland Sapphire guidance needed
  149. Question about specialized OPT
  150. My first build tubelab SE
  151. k16ls tube amp on/off switch?
  152. SY Tube Phono Improvements?
  153. Tube newbie, anyone familar with s-5 k-502? Help needed please
  154. TVA-1 Michaelson & Austin with problems
  155. New to HIFI tube need advice
  156. Crosstalk between Triodes in Dual Triode Tubes
  157. 6L6GC instead of EL34
  158. Schade feedback and CFB
  159. Sansui AU-70 - Help Needed
  160. Pentode C.F, where to connect the suppressor grid ?
  161. Separate PSU for PP EL34 / 6SN7GT integrated amp
  162. Simple SE driver with mosfet (6sn7/307A) IRF820
  163. Is it safe to run pentode w/ no screen voltage for a min?
  164. Low B+ and CCS question
  165. Has anyone ever used slate in audio?
  166. Semi-Fixed Bias?
  167. Transformers MIC and Phono
  168. 6L6GC...More Voltage...or More Current?
  169. help me
  170. Anybody built/heard Melquiades amp
  171. Elevated grid bias
  172. Oscillation found in Luxman LX33
  173. RCA phono amp project
  174. Test of 45 Triode with EICO 625?
  175. Standard Silicon Diode Rectifier's VS Ultra Fast
  176. Output Transformer for L3 pre Audio Note
  177. "Boosted" Triode operation?
  178. 6HB6 UL push pull amp
  179. Interstage transformer ratio, spacecharge tubes in PP
  180. 6N6P line stage
  181. Revamping Tube Amp Monoblock - capacitor grounding concern
  182. 845 set bias.
  183. How to improve on a working Hybrid Amp: 832A Tube with MOSFETs
  184. tube outputs
  185. Coupling Cap Consistency
  186. Volume adjustment on 8ch at once
  187. Sub minature tube gain stage question.
  188. DHT PSE 2A3
  189. Plate voltage mic pre
  190. Estimating load for Duncan Amps PSU tool HOWTO?
  191. Shuguang Treasure Series 300B-Z not satisfactory!
  192. Choosing OP of small signal tubes with CCS in the cathode
  193. Aikido help needed
  194. Exploding 300B
  195. power output of EL34
  196. 76 tube into C3M (triode) via LL1660 to PP output stage
  197. best operating points for e182cc tube
  198. Any thoughts about this volume/bal arrangement
  199. Filament tension spring material
  200. DC coupled SE Schade amp
  201. First build 6V6 based
  202. Failed Converting UL to Pentode!?
  203. 1955 kids record player hum puzzle
  204. subwoofer output from my tube preamp
  205. EL84 SE Amp - specific transformer
  206. "GOOD" backup KT-88
  207. New or Old Output Transformer?
  208. Motorola console recap question
  209. Plate voltage on preamp tube too high
  210. Good valve design calculator website
  211. Ultra-on push-pull tetrode 6550
  212. My introduction to tube amps. The good, the bad, and the ugly.
  213. How do I calculate local feedback %?
  214. Newbie greeting & Resource
  215. Tips/Help With a Dying OTL Headphone Amp
  216. 6B4G and ECC83
  217. Maron buys a tube amp
  218. Newbie
  219. 845 AC filaments, my experience
  220. 8552 finals ?
  221. Low voltage 3W S.E. little amp, need comments and suggestions
  222. Single ended push pull ultra linear or?...
  223. Hello and questions about Magnavox SE amp
  224. Amp identification
  225. Millett DCPP No Output.
  226. using a Hammond 835 interstage ?
  227. Recommendation on versitile tube tester
  228. Mullard 6SN7GT
  229. RIAA tube pre amp
  230. Cheapo Ebay voltmeter
  231. Jolida SJ202a Schematic
  232. Tetra All in One Phono Preamp voltage
  233. Console pull advice
  234. Local feedback on IT secondary (PP amp)
  235. Computerized Curve Tracer Project
  236. Is 6w enough and can i use phone power amp?
  237. Yaqin MS-12B preamp - how to get more gain?
  238. Inductor Multiplier Patent
  239. KT90
  240. 6L6GC Hybrid Partial Feedback
  241. 7868 to 7591a conversion help
  242. SOS! 21st Century Regulator Dead!
  243. Transformer Placement - To shield or not to Shield
  244. cap multiplier suggestions wanted
  245. Bridging stereo tube amp to one more powerful mono output
  246. Weird pentode connections
  247. My last S.E. amplifier (pentode driver + Beam Power Tube Ultralinear mode)
  248. Please help info UTC transformer
  249. ARC SP-6B Tube Heaters Glow Very Bright at Startup
  250. SUPER budget DIY tube amp - need help

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