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  1. how to calculate lower operating point?
  2. Anyone on the tube forum ever heard a Bride Of Zen preamp?
  3. Audio Innovations 800 mk1
  4. Field of Dreams (a pair of FRT502 modulators)
  5. cathode follower
  6. ECC808- what is it more like?
  7. Help needed to find these rare values!
  8. New PP amp just completed - a few unusual features (long)
  9. MKP VS Electrolyte
  10. is 5mA too low???
  11. Dynaco FM3 220v-120v
  12. does plate current/voltage effect tube sound????
  13. Any opinions on the ECC81?
  14. #26 line stage help
  15. coupling caps? RTX vs Jupiter wax
  16. MC275 Hum Conundrum
  17. We91a
  18. Is 50 degrees C too hot?
  19. Using LEDs to bias grid voltage?
  20. DIY Hybride amplifiers
  21. wa i popped a tube lol
  22. 6C33C substitute
  23. Resistor popped...need help for replacement in Yaqin amp
  24. Check this eye candy out....
  25. Russian 5U4GB
  26. simple phono preamp circuit needed
  27. Black gate PS capacitors
  28. amp troubles
  29. Instruments Of Amplification - DIY
  30. my EL84 pre-amp with schematic
  31. Radical (insane) PSU ideas
  32. First Tube Amp Considerations...
  33. hardcore tube night light?
  34. Frankenstein tube amp
  35. Can I use this tube?
  36. help for DHT bias in PP
  37. Multiple projects
  38. recommend operating point for EL84?
  39. First time builder, need advice.
  40. Tube Depot...
  41. schematics
  42. BOGEN MX60A Schematic
  43. Help with 1626 PSE Amp needed
  44. OTL question.
  45. diy tube amp
  46. Load line for CF
  47. DIY Vacuum tube amp
  48. Hammond or James OPT for SE 300B ?
  49. PSE 6550 schematic needed
  50. Schematic for Siemens "Table" Amplifier
  51. power supply for 6922 mu follower
  52. Dead simple tube circuit
  53. Any info on a Musical Fidelity X-Pre?
  54. Autoformer CF amp
  55. 2a3 or otl on an fullrange coral
  56. My New Project Completed
  57. SE el84
  58. Many thanks!
  59. Switching power supply & filament
  60. tube phono amp req'd
  61. Had a strange problem today...
  62. wsw siemens ultralinear 815 410 G !!?!
  63. Bottlehead Gear
  64. Amp, Stange temporary buzz, what is that?
  65. 2a3 schematic
  66. NEWBIE needs help-static in one channel of preamp
  67. Vintage speaker screw outs to 1/4" plug
  68. Flashing EL34
  69. Sovtek 2A3 tolerances / defected tube?
  70. Massive Parallel Operating
  71. filter circuit for 866a
  72. reasonable powered simple amp
  73. 6c19pi ?
  74. S5 Electronics 139 $ tube amp
  75. 12AU7 or 12AT7 instead of 12AX7 ?
  76. Tube Pre-Amp < $200
  77. Modification of 2A3 SE Circuit
  78. beta followers
  79. Q: Stereo Amp / Dual PS Chokes
  80. using Mosfets as diode in PS
  81. Sonic Frontiers Power 2SE
  82. Curcio daniel
  83. Ecc89 / Ecc189
  84. Magnavox
  85. Tube Preamp 'Clone' PCB copys on ebay (Marantz, McIntosh, etc)
  86. tube rectifier life expectancy
  87. Metal VS Glass
  88. does anybody know this transfo?
  89. need help finding tube make
  90. VTL deluxe 300 amps - adjustment question
  91. help converting conrad johnson MV-55 into triode!
  92. Does more tubes = more filter capacitors?
  93. 6V6 GT, Do they worth playing with them ??
  94. 12ax7 > 6sn7 > 300b
  95. calculating NFB dB
  96. PCL806 is equivalen to PCL86?
  97. anti digitalizing process
  98. Telefunken?
  99. Bogen MX30A
  100. base for amp
  101. Unbalanced - Balanced Tube Preamplifier wanted
  102. rusty iron- need help :)
  103. A new/old CCS?
  104. Rogers Cadet III - balance control
  105. Anyone tried Van Alstine's OmegaStar Bridge?
  106. Plasma/ion tweeters
  107. PP 6B4G stereo amp filament question
  108. tube tone control?
  109. trio amp up in smoke-ya really up
  110. Ideas for SE amp with this tube
  111. regulated PS - with Zener diode
  112. Filament voltage of PP2A3
  113. Dennis Boyle, Alliance Audio
  114. How do I replace this 40+ year old selenium rectifier?
  115. please advise on operating point of a 5687
  116. Output Transformer Question
  117. Stepped attenuator
  118. PP2A3 amp options
  119. Need advice: Want to learn Vacuum tubes
  120. AVO CT-160 --- Help
  121. Needed schematic....
  122. Az1 mounted on wood!
  123. Dynaco A450 specs
  124. Ecc186= SQ Ecc82
  125. tube amp kit on 230 v???
  126. some tubes
  127. ppp el84 fixed bias schematics
  128. Tube buffered NIGC trafo thoughs?
  129. driver stage
  130. PS cap placement/type
  131. Vintage OPT
  132. simple, single-ended project
  133. 6sn7 - 6bx7 - sv811-3 amp
  134. I look for a correct driver stage
  135. PCB tubes amp?
  136. XLR to 1/4" TRS?
  137. Umbilical Connector Suggestions
  138. Good Inexpensive Starter Amp Kit
  139. tube rectified preamp schematic
  140. oxygen free interconnects
  141. how to calculate feedback resistor
  142. Topaz Isolation Tranny
  143. 4E27A monster se amp??
  144. 6V6 Parafeed?
  145. Old Tranny Potting Material
  146. Brimar ECC81
  147. PCB mounting B7G sockets
  148. Directly heated cathodes, but why?
  149. SET kit for newbie
  150. High Power 805 Triode based amplifier
  151. DigitalSignalProcessing -&gt; future?
  152. 5v Damper Diode?
  153. Tubes in Class D amplifiers
  154. Universal power supply UIP-1 from former USSR schematics
  155. First project for Proac loudspeakers
  156. transformers
  157. cathode battery bias questions
  158. tube amp project
  159. AN DacKit 1.2 Upgrade Ideas
  160. What are the requirements for driving a 300B?
  161. 900v. 100ma. Power supply for 813 tube amplifier
  162. Chassis Internal Height / Pot Clearance
  163. Bogen help
  164. Tube tester questions
  165. 211 VT-4C Good Simple SE Schematic
  166. mosfet in regulated PS.
  167. Hammond Transformer in Toronto
  168. 6n30pi plate resistance ?
  169. balanced input stage
  170. A better triode strap?
  171. Chinese new 845
  172. what tube manufacture of 6550??
  173. Low frequency noise in a 12B4 preamp
  174. Difference between CK6528 and 6528A ?
  175. 6L6 help needed
  176. Hawksford style error correcting output
  177. SE UL OT - primary wired in reverse
  178. tube bias pot question
  179. Transformer supplier in Australia
  180. Newb here
  181. Anyone familiar with James output transformers?
  182. What Limits Freqency response in a simple tube amp like the zen?
  183. Grid driven (ETM) KT88 SE amp design - final works on paper
  184. Sansui 1000 outputs?
  185. The overlooked is often cheaper
  186. Tube amp design characteristics?
  187. ecc40 or 76 as driver for 2A3
  188. toroids on top of each other ?
  189. Out Of Order
  190. Pinging JAX (Sweden)
  191. Common Cathode 6922 output impedance?
  192. Blue Velvet Preamp
  193. Has anyone got any plans for a car amp?
  194. Tube Radio Kit
  195. New Tube Porn!!
  196. Need someone to host my "TUBE PORN" images.
  197. Trying to understand preamp schematic...
  198. 6C33C schematic
  199. We have liftoff!!!! Houston, all systems are go!
  200. Dynaco ST70
  201. Is Tesla still going?
  202. yet another 12b4a
  203. Tubes load resistance and output trans impedance
  204. Antique schematic help please.
  205. 12b4a wiring question
  206. $1 AMP find
  207. Heater winding load question.
  208. Direct Coupling Modulated Bias (SET)
  209. Amp with 6c33
  210. Ideas for amp rebuild...
  211. simple tube amp
  212. What's the ideal tube amplifier for me for max. $660 , maybe a kit ?
  213. CCS design help!!
  214. Proposed Transfomer/Valve Layout
  215. My darling is giving me hell!
  216. EL84 or 6v6 or something else?
  217. Borbely hybrid phono
  218. SS power supply question
  219. RCA Tube Radio...circa 1930-40
  220. New project on 807
  221. SE design using 10k OPTs
  222. Biasing a cathode follower?
  223. Lower Distortion Alternatives to 12AT7 & 12AU7 ?
  224. Oil in Paper in oil capacitor.
  225. Information needed
  226. Hybrid
  227. found two boxes of GE 6CL6 tubes
  228. Please help me compare 2 cattle of fish...
  229. Vacuum Tube Valley 6SN7 preamp
  230. SET Power Supply Regulation
  231. TubeCAD
  232. 60 Hz noise in modified Audible Illusions M2B
  233. Anodized Aluminum and Glue/Epoxy
  234. shared parts between channels
  235. May I use 5K transformer for Dynaco III amp?
  236. First amp build questions
  237. Help needed changing from srpp5814a to srpp12bh7a
  238. ok, i'll try and make it simple.
  239. Sure, copy an amp. . . It'd work but I'm looking for something different.
  240. Half a bee Philosophically. . . Er sorry Its actually about ECC83 amps
  241. Bogan schematic for HO 50 power Amp
  242. Can VT-185 be applied in audio circuit?
  243. Best PP transformer for 2A3 amp?
  244. help in finding tubetester meter value
  245. B+ Voltage
  246. CCS Conceptual Qs, Using Gary Pimm CCS as Example
  247. Is there a no/gain preamplifier schematic using high-distortion EC90?
  248. Klystron??
  249. single ended 2a3 project
  250. Visit Shuguang tube factory(many pics)

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