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  1. 6688/E180F line stage?
  2. Variable feedback to enhance damping factor at low frequency
  3. Need assistance with picking the right Edcor audio transformer
  4. Critique my first design
  5. Biamping, phase of output?
  6. Ground star
  7. op-points for 27 pre...?
  8. Opinions/Experience of Toroidal valve amps
  9. hum, no way to get rid of it
  10. How to adjust my circuit for frequency response?
  11. Input Tubes?
  12. 6BG6 = 6L6GC with top cap - cheap!
  13. Maida Regulators Redux
  14. ground of DC bias supply
  15. does anyone the website for yaqin/mr. liung/music angel amps?
  16. plate load ccs ala gary p question
  17. Books for newbe
  18. 6AS7 OTL
  19. n00b phono preamp troubleshooting..
  20. TubelabSE - Anyone built?
  21. any example of SE designs using GM70?
  22. Shunt regulator question
  23. Any RH807 builders?
  24. Replacing multi-section caps with multiple caps?
  25. Recycle an Eico HFT-90 for a preamp
  26. EL84 PP output transformer for 6L6 PP class A
  27. Jensen PIO capacitor burn in
  28. toroid psu, weird results...
  29. Squeaky Noise in ARC Dual 75
  30. EL84 mod questions
  31. Measuring DC at preamp output
  32. Is Northern Electric the NEW W.E.?
  33. Burnt Woodside STA35 valve amp... Help!
  34. My tube preamplifier project
  35. Ponderings on hybrid 300B
  36. Maida Regulator Parts
  37. anyone familiar with the 211/vt4c circuit from Fi Primer?
  38. Calculating operating points of two DC stages
  39. Advice for retubing VTL Ichiban`s
  40. Need help
  41. Art Audio Kit on Common Ground Magazine
  42. Advice for retubing VTL Ichiban`s
  43. fisher 800c intermitant hum
  44. calling Yves....
  45. X10 Pre
  46. NEW KT66 - 6AU6 single ended
  47. mechanical hum
  48. Big valve preamp
  49. Question about biasing heater above cathode in a direct coupled circuit.
  50. center tapped choke inverter
  51. Guitar tube pre DIY suggestions..?
  52. Which One Of These Tube Amps Should I Buy?
  53. Tube Info
  54. Circuit/Equipment Designer
  55. help needed with noise in phono preamp
  56. Pentode driver and IT?
  57. Plate Caps for 832A
  58. 300b advice
  59. Designs on your noob, err, tube
  60. 7788 Triode Curves
  61. EL81/6CJ6 operating point
  62. Separate cathode resistors in push pull output
  63. C3m linestage
  64. Anyone know this 13E1 design...
  65. LTP w/ positive only supply
  66. 6V6 line preamp
  67. The 6P43P russian tube is a EL84 equivalent ??
  68. Ixys IXCP10M45s IC
  69. Help with hybrid mosfet valve amp
  70. Substitute for 6gw8 in Heathkit aa-32
  71. U-Follower: Output from Cathode or Plate?
  72. Getting rid of oscillations in the preamp
  73. has anyone used the 4-125A in SE amp ?
  74. line preamp using 6SN7 instead of 12AU7
  75. 3-pong conversion for Acoustic amplifier
  76. 6v6pp design
  77. CCS Plate Load
  78. All tube voltage doubler
  79. best value/performance ECC83 on market
  80. Help needed for my preamp
  81. 6H6p cascode differential driving 2A3 PP
  82. Best phono / line preamp
  83. Point to Point
  84. gain curve questions
  85. Questions concerning Aikido Line amp
  86. Partial cathode bypass to effect a treble boost.
  87. SE bass
  88. choke orientation
  89. Musical Fidelity X-PRE schematic
  90. Circuitmaker Spice question
  91. Trouble with a paraphase PI
  92. 27 pre PS question..
  93. 6AV5 g2 driver
  94. Calculate PSU output impedance?
  95. Output stage biasing, with the driver stage
  96. tube pedal plate voltages?
  97. grounding and 12AV6 diodes
  98. 6as7 Pse
  99. Looking for datasheets
  100. Ping Albert from Canada
  101. Old Tektronix booklet
  102. fisher 800c phase inverter adjustment 2
  103. Quick Transformer Question
  104. Power supply for Heathkit
  105. low-power output tube quality
  106. Conn Caprice organ
  107. Conservation of tubes
  108. Brimar EM87
  109. Tube sockets without the ceramic carrier.
  110. SET with tube-based CCS???
  111. fisher 800c modifications
  112. Bottlehead meet.
  113. Tie cathode to heater??
  114. anyone seen it tried like this?
  115. What do people think of the SETH 2A3 PP?
  116. Very high plate voltage EL34 amp
  117. How About Bridging SE
  118. Fisher 800c Has Odd Cathode Reading
  119. What part of DIY do you LOVE?
  120. Priboi tweakers ?
  121. 5751 and 12ax7
  122. LM317 + ceramic cap Q
  123. Derive Triode Curves from Pentode Curves?
  124. 7701 distortion device?
  125. Looking for the perfect giftshop
  126. 300b
  127. Choked ripple killer for SE?
  128. Dynaco Kits
  129. Positive bias for tube CF?
  130. need help
  131. Xindak attenuation for use with Leak Stereo 20, help please
  132. Series heaters = small problem?
  133. Recommend an EL84 tube for HIFI
  134. Help - need some info on this valve amp, please
  135. H. Olson's amps
  136. 12AT7 and the Simple EL84
  137. New K-12g only one channel working
  138. Kofi Annan in: "Kofi Makes a 300b DRD... and You Get to Help!"
  139. Rauland Borg 6L6 amp Need Info
  140. Hum Noise!
  141. Tube regulator for solidstate devices
  142. 6gu7 a sub for 6cg7/6fq7?
  143. obsession sd-600 300b mono block
  144. how do you know you need matched pair?
  145. Nobu Shishido's 805 SET interstage
  146. KT88SE, turning OPT
  147. New to tubes.
  148. OB with.......well, TL Audio's iTUBE :)
  149. Matched tubes required?
  150. GU-50 output trafo
  151. Are Hammond power transformers good enough ?
  152. Transformers.
  153. Quicky - magic eye between preamp and power stage
  154. HT to rectifier
  155. 6AV5 spice model
  156. Audio Research LS2 from 110V to 220V
  157. 6V6 PP power xfrmr
  158. I think I've damaged my amp
  159. Which brands apart wyetech uses Grounded grid?
  160. Parallel vs. series filament supply - or another filament idea
  161. 6146W Power Amplifier. Please help!
  162. grommes 511a mono tube amp/reciever
  163. First phono needs QC
  164. Meixing 3008ab problems
  165. protecting a VR tube
  166. what's the purpose of pins 3 and 7 in an 8pin VR tube?
  167. help me i need schematic of Music angel PP el34
  168. How long to pre-heat filaments on 6SN7s?
  169. Amplifier Layout - Help & advice needed
  170. Any good places to shop for diy in beijing?
  171. White CF with 6SN7
  172. Cheapo Guitar Amp
  173. Power Amp
  174. is there any sound in a 30A5 / HL94 ?
  175. the hybrid one
  176. 4-1000a se subwoofer amp
  177. ear 834p output resistance
  178. Output transformer push pull
  179. Cheap Lunch?
  180. Source for Alps RK18 pot's..?
  181. Triode strapped tetrode
  182. ok, help me out here......
  183. Homebrew Toroid O/P Tranny
  184. GIBSON GA-79RVT Stereo Cab plans or dims
  185. strange noises from ECL86 amp
  186. Retouching knicks and scratches on chassis
  187. MingDa MC-7R noise and gain
  188. start-up sequence of Aikido preamp / SS power amp
  189. Driving a 6B4G with a single 5687/7044/E182CC?
  190. phono stage with different replay equalization?
  191. Lprimary variation in pair old opts
  192. 8417 triode connected tube data
  193. 5763 = El84?
  194. 5687 to 6L6 SE ?
  195. TubeCad Feedforward Shunt Regulator
  196. "12EA6" Pentode !
  197. Marshall EL34-100/100
  198. short-circuit rectifier EZ80 !
  199. Good radio tube:6AQ5/6005
  200. Replaced pulled tubes with a resistor?
  201. Choke input PSU, drawbacks?
  202. Heater PS alternative / Redux
  203. Gold or silver dress-up rings for tube amps.
  204. 50C5 conversion
  205. Sa-5.1 blow fuse
  206. Hum problem of preamp
  207. Chassis ground blows fuse
  208. 7193 (2c22) preamp buzz/hum
  209. Se Opt
  210. Does anhone use those switching power supply for the heaters?
  211. Tube Minidoc, featuring New York Noise
  212. Help Choosing A Sowter Trans For My DAC?
  213. fisher 800c clipping at ultra low volume
  214. "audiodigit" tubalizer & tubepre original schematic
  215. Dht Guitar Amps
  216. rating of series caps
  217. F704
  218. tube socket PCB library or dimensions
  219. motorboating
  220. 6AN8 Triode connection + EL 84 PP
  221. Please help amend 6AS7PP circuit
  222. El84 Pp
  223. 6V6 Ultralinear
  224. Dear Moderators
  225. 845 se
  226. Bell 2122-B integrated amp - tube suggestions
  227. Wirewound pot for Rk
  228. KT88/90 F2011 Schematic
  229. United Electric 967
  230. Scott 222c mods...?
  231. Switching supply for 300B filaments
  232. ECF80/6BL8
  233. 24v tube buffer & line stage schematic
  234. Vintage gear hunting
  235. Seperate PSU Transformers? Filament Supplys?
  236. 828 is better
  237. Hum on a choke loaded stage
  238. SE Transformer question
  239. Design question - How to make amp porn visible?
  240. Leak Stereo 20 - Johan's Square Wave Theory
  241. K-12G First Time Build
  242. Vishay vt52-55 resistors in a tube amp
  243. EL84 Push-Pull ccs bias
  244. Eight 807's in Push Pull?
  245. Working with Current O/P DAC Chips
  246. Unison research Preludio schematic
  247. Rewinding Power transformer
  248. Information needed on RCA SPECIAL RED TUBES
  249. Score?
  250. Herron phono

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