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  1. 5687 Preamp as I plan to build it.
  2. Hoekstra DC-Coupled 300B ... oooooh!
  3. 5687_6n1p_6p1p_gary pimm
  4. How lucky are we? TJ type 50 triode to be made. Make your preferences known now!
  5. Biasing DC heaters
  6. EL34 SE amp schematics
  7. Negative Voltage with Tube Rectification?
  8. Tube Amp on eBay
  9. Experiences with White CF/CCS CF output stage
  10. Holes in the anode plate?
  11. 5687 pre?
  12. tube design literature
  13. Trace Elliott schematic
  14. tube choice?
  15. Choke identity
  16. spotted this on ebay - 700w triodes anyone?
  17. HELP!!! for tube lovers
  18. How do you properly ground a Tamura OPT?
  19. Akihabara shopping
  20. Might be interested in this distortion thread
  21. PSE Active Loaded 12B4A anyone?
  22. Set 6080/6as7
  23. solid state just isn't doing it for me!!
  24. Where can I use this tubes
  25. Interesting math conundrum.
  26. schematic from this amp 45/717a/5u4..
  27. Strange Tube
  28. power supply help!!!!
  29. se tubeamp with px4
  30. Fixed bias PP questions
  31. Identifying Eico transformers
  32. metal shield
  33. why multi pins ?
  34. 2A3 PSE 'Arcadia' by SJS, or sorta
  35. John Swenson's (In my eyes revolutionary) preamp!
  36. tube opamps
  37. Help please with rare tube cd player
  38. OT impedance problem
  39. Amperex 6DJ8
  40. tiny amp
  41. 6C33 Internal Impedance (rp)?
  42. increasing o/p impedance to match IT??
  43. Grundig TK-60 Reel to Reel Questions
  44. Michaelson and Austin Oddysee
  45. 6gk6 tubes
  46. Anyone know anything about a 6AV5GA?
  47. A safe (?) DC coupled amp
  48. amp in trouble
  49. how to calculate lower operating point?
  50. Anyone on the tube forum ever heard a Bride Of Zen preamp?
  51. Audio Innovations 800 mk1
  52. Field of Dreams (a pair of FRT502 modulators)
  53. cathode follower
  54. ECC808- what is it more like?
  55. Help needed to find these rare values!
  56. New PP amp just completed - a few unusual features (long)
  57. MKP VS Electrolyte
  58. is 5mA too low???
  59. Dynaco FM3 220v-120v
  60. does plate current/voltage effect tube sound????
  61. Any opinions on the ECC81?
  62. #26 line stage help
  63. MC275 Hum Conundrum
  64. We91a
  65. Is 50 degrees C too hot?
  66. Using LEDs to bias grid voltage?
  67. DIY Hybride amplifiers
  68. wa i popped a tube lol
  69. 6C33C substitute
  70. Resistor popped...need help for replacement in Yaqin amp
  71. Check this eye candy out....
  72. Russian 5U4GB
  73. simple phono preamp circuit needed
  74. amp troubles
  75. Instruments Of Amplification - DIY
  76. my EL84 pre-amp with schematic
  77. Radical (insane) PSU ideas
  78. First Tube Amp Considerations...
  79. hardcore tube night light?
  80. Frankenstein tube amp
  81. Can I use this tube?
  82. help for DHT bias in PP
  83. Multiple projects
  84. recommend operating point for EL84?
  85. First time builder, need advice.
  86. Tube Depot...
  87. schematics
  88. BOGEN MX60A Schematic
  89. Help with 1626 PSE Amp needed
  90. OTL question.
  91. diy tube amp
  92. Load line for CF
  93. DIY Vacuum tube amp
  94. Hammond or James OPT for SE 300B ?
  95. PSE 6550 schematic needed
  96. Schematic for Siemens "Table" Amplifier
  97. power supply for 6922 mu follower
  98. Dead simple tube circuit
  99. Any info on a Musical Fidelity X-Pre?
  100. Autoformer CF amp
  101. 2a3 or otl on an fullrange coral
  102. My New Project Completed
  103. SE el84
  104. Many thanks!
  105. Switching power supply & filament
  106. tube phono amp req'd
  107. Had a strange problem today...
  108. wsw siemens ultralinear 815 410 G !!?!
  109. Bottlehead Gear
  110. Amp, Stange temporary buzz, what is that?
  111. 2a3 schematic
  112. NEWBIE needs help-static in one channel of preamp
  113. Vintage speaker screw outs to 1/4" plug
  114. Flashing EL34
  115. Sovtek 2A3 tolerances / defected tube?
  116. Massive Parallel Operating
  117. filter circuit for 866a
  118. reasonable powered simple amp
  119. 6c19pi ?
  120. S5 Electronics 139 $ tube amp
  121. 12AU7 or 12AT7 instead of 12AX7 ?
  122. Tube Pre-Amp < $200
  123. Modification of 2A3 SE Circuit
  124. beta followers
  125. Q: Stereo Amp / Dual PS Chokes
  126. using Mosfets as diode in PS
  127. Sonic Frontiers Power 2SE
  128. Curcio Daniel
  129. Ecc89 / Ecc189
  130. Magnavox
  131. Tube Preamp 'Clone' PCB copys on ebay (Marantz, McIntosh, etc)
  132. tube rectifier life expectancy
  133. Metal VS Glass
  134. does anybody know this transfo?
  135. need help finding tube make
  136. VTL deluxe 300 amps - adjustment question
  137. help converting conrad johnson MV-55 into triode!
  138. Does more tubes = more filter capacitors?
  139. 6V6 GT, Do they worth playing with them ??
  140. 12ax7 > 6sn7 > 300b
  141. calculating NFB dB
  142. PCL806 is equivalen to PCL86?
  143. anti digitalizing process
  144. Telefunken?
  145. Bogen MX30A
  146. base for amp
  147. Unbalanced - Balanced Tube Preamplifier wanted
  148. rusty iron- need help :)
  149. A new/old CCS?
  150. Rogers Cadet III - balance control
  151. Anyone tried Van Alstine's OmegaStar Bridge?
  152. Plasma/ion tweeters
  153. PP 6B4G stereo amp filament question
  154. tube tone control?
  155. trio amp up in smoke-ya really up
  156. Ideas for SE amp with this tube
  157. regulated PS - with Zener diode
  158. Filament voltage of PP2A3
  159. Dennis Boyle, Alliance Audio
  160. How do I replace this 40+ year old selenium rectifier?
  161. please advise on operating point of a 5687
  162. Output Transformer Question
  163. Stepped attenuator
  164. PP2A3 amp options
  165. Need advice: Want to learn Vacuum tubes
  166. Needed schematic....
  167. Az1 mounted on wood!
  168. Dynaco A450 specs
  169. Ecc186= SQ Ecc82
  170. tube amp kit on 230 v???
  171. some tubes
  172. ppp el84 fixed bias schematics
  173. Tube buffered NIGC trafo thoughs?
  174. driver stage
  175. PS cap placement/type
  176. Vintage OPT
  177. simple, single-ended project
  178. 6sn7 - 6bx7 - sv811-3 amp
  179. I look for a correct driver stage
  180. PCB tubes amp?
  181. XLR to 1/4" TRS?
  182. Umbilical Connector Suggestions
  183. Good Inexpensive Starter Amp Kit
  184. tube rectified preamp schematic
  185. oxygen free interconnects
  186. how to calculate feedback resistor
  187. Topaz Isolation Tranny
  188. 4E27A monster se amp??
  189. 6V6 Parafeed?
  190. Old Tranny Potting Material
  191. Brimar ECC81
  192. PCB mounting B7G sockets
  193. Directly heated cathodes, but why?
  194. SET kit for newbie
  195. High Power 805 Triode based amplifier
  196. DigitalSignalProcessing -&gt; future?
  197. 5v Damper Diode?
  198. Tubes in Class D amplifiers
  199. Universal power supply UIP-1 from former USSR schematics
  200. First project for Proac loudspeakers
  201. transformers
  202. cathode battery bias questions
  203. tube amp project
  204. AN DacKit 1.2 Upgrade Ideas
  205. What are the requirements for driving a 300B?
  206. 900v. 100ma. Power supply for 813 tube amplifier
  207. Chassis Internal Height / Pot Clearance
  208. Bogen help
  209. 211 VT-4C Good Simple SE Schematic
  210. mosfet in regulated PS.
  211. Hammond Transformer in Toronto
  212. 6n30pi plate resistance ?
  213. balanced input stage
  214. A better triode strap?
  215. Chinese new 845
  216. what tube manufacture of 6550??
  217. Low frequency noise in a 12B4 preamp
  218. Difference between CK6528 and 6528A ?
  219. 6L6 help needed
  220. Hawksford style error correcting output
  221. SE UL OT - primary wired in reverse
  222. tube bias pot question
  223. Transformer supplier in Australia
  224. Newb here
  225. Anyone familiar with James output transformers?
  226. What Limits Freqency response in a simple tube amp like the zen?
  227. Grid driven (ETM) KT88 SE amp design - final works on paper
  228. Sansui 1000 outputs?
  229. The overlooked is often cheaper
  230. Tube amp design characteristics?
  231. ecc40 or 76 as driver for 2A3
  232. toroids on top of each other ?
  233. Out Of Order
  234. Pinging JAX (Sweden)
  235. Common Cathode 6922 output impedance?
  236. Blue Velvet Preamp
  237. Has anyone got any plans for a car amp?
  238. Tube Radio Kit
  239. New Tube Porn!!
  240. Need someone to host my "TUBE PORN" images.
  241. Trying to understand preamp schematic...
  242. 6C33C schematic
  243. We have liftoff!!!! Houston, all systems are go!
  244. Dynaco ST70
  245. Is Tesla still going?
  246. yet another 12b4a
  247. Tubes load resistance and output trans impedance
  248. Antique schematic help please.
  249. 12b4a wiring question
  250. $1 AMP find

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