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  1. Weird oscillation
  2. Tube stash strategy and testing (long)
  3. Choke loaded LTP
  4. LM Ericsson 2C51 help!
  5. Antek TXs??Any use em???
  6. Speaker impedance questions (SE KT88)
  7. Spud-Assist: Totem-Pole Current-Mirror PP Hybrid
  8. my 6922 / E88CC preamp
  9. For the moderator
  10. 3 amps for HE speakers
  11. Pentode sounds great
  12. Shindo claret
  13. james 6123hs
  14. 6550 Amplifier
  15. ARC Ls 15 Schematic
  16. Super spud-amp?
  17. Basic Oscilloscope Usage Questions
  18. Grounded Cathode phase?
  19. Simple SE, how to wire CFB with outputs for different speaker impedances?
  20. PCB Board designer?
  21. Speaker for your low power tube amp?
  22. Tube collection Database.
  23. E288cc value?
  24. Hi End Tube Project
  25. parallel SE 2A3
  26. Want to build a tube/SS hybrid preamp for HT
  27. Do anyone has schematic for Counterpoint SA3000 ?
  28. Thermistor B+ or primary
  29. Measuring AC at Radio Frequencies
  30. The MingDa MC67-HA meets Frankenstein
  31. What's the biggest full wave damper diode?
  32. Maximising Tube Life
  33. Darling power supply calculations
  34. This is nice - Pix Ongen tube RIAA amp
  35. Tubelab SE 45... Super amp!?
  36. DAC - tube gain stage w/ AC heaters
  37. Microphonics?
  38. Insides of Tango Transformers
  39. Thoughts on horizontal sweep tubes?
  40. 2A3 Design Issues (Long)
  41. Design using EL42 output pentodes
  42. Blumlein's Garter Bias question
  43. Original ECL86 "Baby Huey" thread
  44. Too low heater voltage?
  45. Tube and digital?
  46. 807 monoblocks
  47. What to swap a 6AV6 for?
  48. Pot Noise Help
  49. cathode bias circuit question
  50. ECC40 driver stage for 2A3
  51. heater current and 6922 - 6n6p swap
  52. Tube Crystal Clock Oscillator
  53. Decware Zen Plate Model ZSP1
  54. Battery Power Preamp E188CC review please !
  55. 6sl7
  56. Tube sale at AES
  57. 5v3a
  58. 813 trioded Datasheet and curves
  59. Importance of resistor working voltage spec?
  60. TCJ My-Stock DB
  61. 845 Amp
  62. Ripple filtering help... strange slow rise and fall of voltage
  63. Plate and Filament Transformers
  64. Tentlabs Neg Bias Vs Machmat AFB
  65. Looking for 12AT7/ECC81 phonostage schematic
  66. 6AV5 PP amp Design Review
  67. 6sn7 Preamp power supply
  68. Please: tube kit for <$300?
  69. making a load line
  70. Telefunken Consoles: not just for tube and iron scavenging!
  71. Genalex Gold Lion KT77
  72. driving HD600
  73. Counterpoint SA-3000
  74. Phono stage for 2 7F7s (stereo) plus buffer?
  75. Help and your input on YAQIN MC10L EL34
  76. EL Cheapo Quad amplifier???
  77. Noob questions about a K-12/K-502 kit
  78. 3 quick transformer questions
  79. Push Pull Output tranies for SE amp?
  80. Tube Rectifier Capacitance?
  81. rca 189 b console amps need more info
  82. upgrade transformer?
  83. Parasitic oscillation? (picture)
  84. newbie question : driver/output relationship, input sensitivity
  85. Unknown tube logo
  86. Impedance, the 10x rule, losses & bandwidth
  87. el84/6bq5 PSE
  88. A very odd phase inverter- comments?
  89. Please check my work :)
  90. NOS purchase, should I be concerned?
  91. Strange splitter in the Audio Research D4
  92. 6ak5/5654 plate resistance
  93. Further Troubleshooting Simple SE
  94. What is the purpose of the g2 bypass cap?
  95. questionable 2a3 schematic
  96. overdrive circuit for hammond organs(need help)
  97. A singular experiment with a unheated tube.
  98. Limited bass response in one channel
  99. Show me your fave phonostage circuits.
  100. tube heater voltage, how much is too much?
  101. Para feed choke
  102. Dynaco ST35 power?
  103. Tips/comments for upcoming 300B build
  104. page Eli Duttman's Simple p-p with 5965 MQ EXO-173 and 6AQ5
  105. DHT cathode follower idea
  106. GK71 Output Transformer
  107. Schematics for A.I. Mod 2D
  108. Determing Battery Voltage for cathode bias
  109. OT for audio but still tube
  110. Getting transfer characteristics
  111. Pentodes and Choke Loading
  112. Stepped airgap choke ?
  113. Noob question
  114. SE 300B Integrated Amp: Help choose circuit design
  115. SunAudio 2A3 to 300B
  116. Filament Snubber Cap Explodes! What happened?
  117. Alot of 12AX7's about
  118. DIY tube microphone preamp
  119. Tube tester and PSUD II questions
  120. Wurlitzer/Fisher Amp Musings
  121. please check my work
  122. How to get cathode bias info from grid bias info?
  123. SE 300B Integrated Amp: Transformers
  124. Positive feedback, improperly drawn screen, or WTF?
  125. GE Console RC 7100 A - need some help!
  126. Output tube for 600V B+, 5800 ohm primary PP, tertiary 25% UL taps?
  127. Still tring to find a couple 100uf motor runs
  128. small push-pull amp to preamp
  129. Electraprint EL84 PP with PSA-2N
  130. OpAmp Swap?
  131. Bogen MX-60A- output transformer bandwidth?
  132. 6AS7 Parallel Feed Amp
  133. PSpice model of output transformer
  134. simple guitar push pull amp
  135. Siemens capacitor
  136. Super 6BG6 vs. 6550
  137. 5687 line stage
  138. Audio Standards
  139. 4 x used 5867A (TB3/750) triodes
  140. 12au7 who has the best ultra low noise ???
  141. Questions about tweaking the Miniblok SET...
  142. The core -sonic reasons
  143. Removing pot from valve pre amp
  144. Power transformer question
  145. Tube construction materials
  146. LTP second grid
  147. How to figure out the bias point of fisher X-100A
  148. Schematic help! (Bell)
  149. Audio Note Soro SE SCHEMATICS
  150. 807 Tube Triode Connected
  151. Would you pls help.
  152. came across this nice 200W tube amp schematic
  153. Anyone seen this amp topology before?
  154. Max. grid resistance
  155. Yaqin mc10l &quot;popping&quot;
  156. Audio Electronics Supply
  157. Alamo Fury 2566
  158. My friends in the USA - tube stores in LA
  159. Can this marraige work?
  160. RJM with 12AY7
  161. Bias winding to power sand
  162. FM Tube radio design
  163. What do you use? Not technical but relative.
  164. looking for a pre-amp schematic
  165. I have waay too many 6DJ8's
  166. Tango NP126
  167. Two 6J5 versus one 6SN7
  168. Bunch of questions regarding plate CCS and some else.
  169. Tube Store in Washington DC (6C33C Triode Buy Where??)
  170. Scott 399 Receiver Schematics?
  171. Need help with 6l6GC choices
  172. Need Hammond/Everett drawings.
  173. 6V6 PP-based Baby Huey/Mullard inspired design needed...
  174. Ecf80
  175. Please Explain difference Mono vs Push Pull vs Single End etc
  176. VU Meters
  177. diy preamps, bottlehead, decware....
  178. Power supply choke help needed
  179. LED cathode biasing in push-pull input stage
  180. applying fixed bias to cathode followers
  181. Battieries for B+
  182. Put amp in chassis, then, right channel doesn't work!
  183. hammond transformers?
  184. Two Rectifiers, One transformer
  185. Cool problem with Marshall TSL!!!
  186. Tubes currently in production
  187. Rachel's Corner - Shuguang
  188. Small 50C5 Amp improvements
  189. Low voltage pentode?
  190. TX distortion
  191. DIY U-L curves
  192. Transformer spacing
  193. Covers for budget output transformers
  194. Correct for bipolar voltage doubler?
  195. Source for 100uf motor run cap.
  196. magnavox 185aa with 4-6v6
  197. Yaqin 300B re-biasing
  198. Line Amp Diy 6j1
  199. Diy Line Amp£_£_6sn7
  200. Diy Line Amp Audio Note M7
  201. Diy Line Amp Cat Sl-1
  202. Diy Line Amp Malanz 7
  203. Diy Line Amp Htm
  204. Diy Line Amp Jp-80
  205. Diy Line Amp 5670
  206. Quality difference between output transformers
  207. A group-build project for a tube power amp in India
  208. pilot light ideas please
  209. Small signal pentode - zener screen regulation - why not ??
  210. Another KT-88
  211. Rod Coleman filament supply circuit boards
  212. Losing the treble and transient response in this PX25 SE amp
  213. Calculating Zout for Pentode amp with NFB?
  214. Bypassing a volume pot
  215. Lab supply for cathode bias experiment question..
  216. Rheostat for adjustable "fixed" bias?
  217. Output transformer Question
  218. Real Cost of Decware Amplifiers
  219. Digitally driven tube pre-amp
  220. Real cost of Dynaco ST 70 Kits
  221. Fake electrolytics?
  222. Oddball Console Amplifier
  223. Transistor phase splitter (Yaqin MC-84L)
  224. Shuguang to stop 845 and 211
  225. first project.
  226. Help on capacitor info...
  227. Se Kt-66
  228. Is there a power supply guru?
  229. Direct Coupling question
  230. What's the best way to hook up an Isolation transformer
  231. Marzio &Jelasi's Direct Coupled SE Amp
  232. 6SN7 or 6SN7GT??
  233. HY40 Power Triode
  234. parallel capacitors in PS question
  235. Looking for feedback on Bottlehead amps
  236. First Watt F3 / Tube Audio Design TAD-125 Hibachi JFET amps
  237. S-5 Push Pull Power Supply Upgrade!
  238. Capacitor voltage rating conversion
  239. Output Transformer Air Gap
  240. PCF80 -Designing a Pentode Constant Current Sink - help needed.
  241. Purity and simplicity of amp design
  242. watt meters
  243. DIY Dynaco ST70
  244. Help need some info on this Raytheon
  245. Isolating parallel feed amplifiers
  246. Please help for B+ problem!
  247. Second Tubelab Simple SE board done
  248. "Sallen-Key" Public domain?
  249. Transformer questions / Good headphones?
  250. Which Spud Amp?

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