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  1. 2A3 PSE 'Arcadia' by SJS, or sorta
  2. John Swenson's (In my eyes revolutionary) preamp!
  3. tube opamps
  4. Help please with rare tube cd player
  5. OT impedance problem
  6. Amperex 6DJ8
  7. tiny amp
  8. 6C33 Internal Impedance (rp)?
  9. increasing o/p impedance to match IT??
  10. Grundig TK-60 Reel to Reel Questions
  11. Michaelson and Austin Oddysee
  12. 6gk6 tubes
  13. Anyone know anything about a 6AV5GA?
  14. A safe (?) DC coupled amp
  15. amp in trouble
  16. how to calculate lower operating point?
  17. Anyone on the tube forum ever heard a Bride Of Zen preamp?
  18. Audio Innovations 800 mk1
  19. Field of Dreams (a pair of FRT502 modulators)
  20. cathode follower
  21. ECC808- what is it more like?
  22. Help needed to find these rare values!
  23. New PP amp just completed - a few unusual features (long)
  24. MKP VS Electrolyte
  25. is 5mA too low???
  26. Dynaco FM3 220v-120v
  27. does plate current/voltage effect tube sound????
  28. Any opinions on the ECC81?
  29. #26 line stage help
  30. MC275 Hum Conundrum
  31. We91a
  32. Is 50 degrees C too hot?
  33. Using LEDs to bias grid voltage?
  34. DIY Hybride amplifiers
  35. wa i popped a tube lol
  36. 6C33C substitute
  37. Resistor popped...need help for replacement in Yaqin amp
  38. Check this eye candy out....
  39. Russian 5U4GB
  40. simple phono preamp circuit needed
  41. amp troubles
  42. Instruments Of Amplification - DIY
  43. my EL84 pre-amp with schematic
  44. Radical (insane) PSU ideas
  45. First Tube Amp Considerations...
  46. hardcore tube night light?
  47. Frankenstein tube amp
  48. Can I use this tube?
  49. help for DHT bias in PP
  50. Multiple projects
  51. recommend operating point for EL84?
  52. First time builder, need advice.
  53. Tube Depot...
  54. schematics
  55. BOGEN MX60A Schematic
  56. Help with 1626 PSE Amp needed
  57. OTL question.
  58. diy tube amp
  59. Load line for CF
  60. DIY Vacuum tube amp
  61. Hammond or James OPT for SE 300B ?
  62. PSE 6550 schematic needed
  63. Schematic for Siemens "Table" Amplifier
  64. power supply for 6922 mu follower
  65. Dead simple tube circuit
  66. Any info on a Musical Fidelity X-Pre?
  67. Autoformer CF amp
  68. 2a3 or otl on an fullrange coral
  69. My New Project Completed
  70. SE el84
  71. Many thanks!
  72. Switching power supply & filament
  73. tube phono amp req'd
  74. Had a strange problem today...
  75. wsw siemens ultralinear 815 410 G !!?!
  76. Bottlehead Gear
  77. Amp, Stange temporary buzz, what is that?
  78. 2a3 schematic
  79. NEWBIE needs help-static in one channel of preamp
  80. Vintage speaker screw outs to 1/4" plug
  81. Flashing EL34
  82. Sovtek 2A3 tolerances / defected tube?
  83. Massive Parallel Operating
  84. filter circuit for 866a
  85. reasonable powered simple amp
  86. 6c19pi ?
  87. S5 Electronics 139 $ tube amp
  88. 12AU7 or 12AT7 instead of 12AX7 ?
  89. Tube Pre-Amp < $200
  90. Modification of 2A3 SE Circuit
  91. beta followers
  92. Q: Stereo Amp / Dual PS Chokes
  93. using Mosfets as diode in PS
  94. Sonic Frontiers Power 2SE
  95. Curcio Daniel
  96. Ecc89 / Ecc189
  97. Magnavox
  98. Tube Preamp 'Clone' PCB copys on ebay (Marantz, McIntosh, etc)
  99. tube rectifier life expectancy
  100. Metal VS Glass
  101. does anybody know this transfo?
  102. need help finding tube make
  103. VTL deluxe 300 amps - adjustment question
  104. help converting conrad johnson MV-55 into triode!
  105. Does more tubes = more filter capacitors?
  106. 6V6 GT, Do they worth playing with them ??
  107. 12ax7 > 6sn7 > 300b
  108. calculating NFB dB
  109. PCL806 is equivalen to PCL86?
  110. anti digitalizing process
  111. Telefunken?
  112. Bogen MX30A
  113. base for amp
  114. Unbalanced - Balanced Tube Preamplifier wanted
  115. rusty iron- need help :)
  116. A new/old CCS?
  117. Rogers Cadet III - balance control
  118. Anyone tried Van Alstine's OmegaStar Bridge?
  119. Plasma/ion tweeters
  120. PP 6B4G stereo amp filament question
  121. tube tone control?
  122. trio amp up in smoke-ya really up
  123. Ideas for SE amp with this tube
  124. regulated PS - with Zener diode
  125. Filament voltage of PP2A3
  126. Dennis Boyle, Alliance Audio
  127. How do I replace this 40+ year old selenium rectifier?
  128. please advise on operating point of a 5687
  129. Output Transformer Question
  130. Stepped attenuator
  131. PP2A3 amp options
  132. Need advice: Want to learn Vacuum tubes
  133. Needed schematic....
  134. Az1 mounted on wood!
  135. Dynaco A450 specs
  136. Ecc186= SQ Ecc82
  137. tube amp kit on 230 v???
  138. some tubes
  139. ppp el84 fixed bias schematics
  140. Tube buffered NIGC trafo thoughs?
  141. driver stage
  142. PS cap placement/type
  143. Vintage OPT
  144. simple, single-ended project
  145. 6sn7 - 6bx7 - sv811-3 amp
  146. I look for a correct driver stage
  147. PCB tubes amp?
  148. XLR to 1/4" TRS?
  149. Umbilical Connector Suggestions
  150. Good Inexpensive Starter Amp Kit
  151. tube rectified preamp schematic
  152. oxygen free interconnects
  153. how to calculate feedback resistor
  154. Topaz Isolation Tranny
  155. 4E27A monster se amp??
  156. 6V6 Parafeed?
  157. Old Tranny Potting Material
  158. Brimar ECC81
  159. PCB mounting B7G sockets
  160. Directly heated cathodes, but why?
  161. SET kit for newbie
  162. High Power 805 Triode based amplifier
  163. DigitalSignalProcessing -&gt; future?
  164. 5v Damper Diode?
  165. Tubes in Class D amplifiers
  166. Universal power supply UIP-1 from former USSR schematics
  167. First project for Proac loudspeakers
  168. transformers
  169. cathode battery bias questions
  170. tube amp project
  171. AN DacKit 1.2 Upgrade Ideas
  172. What are the requirements for driving a 300B?
  173. 900v. 100ma. Power supply for 813 tube amplifier
  174. Chassis Internal Height / Pot Clearance
  175. Bogen help
  176. 211 VT-4C Good Simple SE Schematic
  177. mosfet in regulated PS.
  178. Hammond Transformer in Toronto
  179. 6n30pi plate resistance ?
  180. balanced input stage
  181. A better triode strap?
  182. Chinese new 845
  183. what tube manufacture of 6550??
  184. Low frequency noise in a 12B4 preamp
  185. Difference between CK6528 and 6528A ?
  186. 6L6 help needed
  187. Hawksford style error correcting output
  188. SE UL OT - primary wired in reverse
  189. tube bias pot question
  190. Transformer supplier in Australia
  191. Newb here
  192. Anyone familiar with James output transformers?
  193. What Limits Freqency response in a simple tube amp like the zen?
  194. Grid driven (ETM) KT88 SE amp design - final works on paper
  195. Sansui 1000 outputs?
  196. The overlooked is often cheaper
  197. Tube amp design characteristics?
  198. ecc40 or 76 as driver for 2A3
  199. toroids on top of each other ?
  200. Out Of Order
  201. Pinging JAX (Sweden)
  202. Common Cathode 6922 output impedance?
  203. Blue Velvet Preamp
  204. Has anyone got any plans for a car amp?
  205. Tube Radio Kit
  206. New Tube Porn!!
  207. Need someone to host my "TUBE PORN" images.
  208. Trying to understand preamp schematic...
  209. 6C33C schematic
  210. We have liftoff!!!! Houston, all systems are go!
  211. Dynaco ST70
  212. Is Tesla still going?
  213. yet another 12b4a
  214. Tubes load resistance and output trans impedance
  215. Antique schematic help please.
  216. 12b4a wiring question
  217. $1 AMP find
  218. Heater winding load question.
  219. Direct Coupling Modulated Bias (SET)
  220. Amp with 6c33
  221. Ideas for amp rebuild...
  222. simple tube amp
  223. What's the ideal tube amplifier for me for max. $660 , maybe a kit ?
  224. CCS design help!!
  225. Proposed Transfomer/Valve Layout
  226. My darling is giving me hell!
  227. EL84 or 6v6 or something else?
  228. Borbely hybrid phono
  229. SS power supply question
  230. RCA Tube Radio...circa 1930-40
  231. New project on 807
  232. SE design using 10k OPTs
  233. Biasing a cathode follower?
  234. Lower Distortion Alternatives to 12AT7 & 12AU7 ?
  235. Information needed
  236. Hybrid
  237. found two boxes of GE 6CL6 tubes
  238. Please help me compare 2 cattle of fish...
  239. Vacuum Tube Valley 6SN7 preamp
  240. SET Power Supply Regulation
  241. TubeCAD
  242. 60 Hz noise in modified Audible Illusions M2B
  243. Anodized Aluminum and Glue/Epoxy
  244. shared parts between channels
  245. May I use 5K transformer for Dynaco III amp?
  246. First amp build questions
  247. Help needed changing from srpp5814a to srpp12bh7a
  248. ok, i'll try and make it simple.
  249. Sure, copy an amp. . . It'd work but I'm looking for something different.
  250. Half a bee Philosophically. . . Er sorry Its actually about ECC83 amps

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