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  1. tube basics: computing mu and transconductance
  2. Aluminium vs steel chassis
  3. Etf06 & 07
  4. FU 13 tubes
  5. Good Souinding Direct Replacement For 325 / OP 37
  6. how to wire 6.3VDC heater on a heater with center tap (12.6V series, 6.3V parallel)?
  7. The Russian 5U4M is a 5AR4 equivalent ?
  8. WE427A Cold Cathode Diode
  9. reversing polarity in regulated B+ and other question
  10. Anthem Integrated 1
  11. Hickok 800 settings
  12. Advice/Help - Cap upgrade
  13. question on old tube sockets
  14. fisher sa-16 very red tube and?
  15. pros/cons of a 845 VS 211
  16. Preamp Power and Voltage Output
  17. Anyone seen these 6L6GCs before?
  18. online transformer info for newbies
  19. High voltage pseudo-triode
  20. Yes, again: mains-powered KILLER amp without a power transformer.
  21. Quicksilver 300b monoblock (KT88 conversion)
  22. Output transformer (SE) - DIY
  23. is Gary Pimm still around?
  24. carbon composition - 2 types
  25. Input attenuation on Leak amp
  26. 101D Sockets
  27. PC86, '88 RF Amplifiers
  28. Jolida SJ-302A tube swap
  29. Inductance for tweeter OPT
  30. Help me.......What is the 6SN7 ???????
  31. high DCR secondary (power transformer)
  32. Transformer power formula Help???
  33. 2A3 OTL 800 Ohm Speaker
  34. Trying to find specs on transformer core material
  35. 12AX7 suggestions?
  36. power supply (cap input)
  37. is it safe to connect these secondaries in series?
  38. Peter Millett's Uniamp with KT88
  39. Mystery transformer
  40. Can I phase split like this?
  41. How to model psud2 using tube regulator?
  42. Choke-loaded 6C33C stage
  43. EL84 as both driver and output stage.
  44. Silvertone (Sears) stereo amp
  45. Chasing hum in a new tube amp
  46. Zenith K731 AM/FM radio audio random cracking sound in FM mode
  47. 6bx7gt Se Amp
  48. Beard P100 Bias Lights
  49. Metasonix TS-21 modulator
  50. help with diyparadiso schematics
  51. electrostatic shield - nice to have or recommended or doesn't matter?
  52. Simple method for 240V from 240V line
  53. Audiophile bibliophilia nervosa
  54. Help with amp layout
  55. Why triode Mk3 is louder than stock Mk3
  56. Seduction or Cornet for phono???
  57. Please review my 6AQ5 Amp
  58. 832A PP Amp LTP
  59. Checklist to observe before applying the mains
  60. C3g driving 2a3: Triode or pentode?
  61. psud2 question and Fi Primer's 211 circuit
  62. Jolida JD-301A & Jadis DPL
  63. Headphones with a Tube Amp
  64. 6S3B-V Wire-Ended Single-Triode tube
  65. Anode stoppers
  66. Weird Quad II mains transformer help
  67. Mullard 5-20 parts list
  68. has anyone DIYed a Citation 2?
  69. Bogen/plexi conversion question
  70. Matched pair - different brands
  71. ERIC Mod 3460P Restore
  72. PV12 Preamplifier
  73. Grandma's old Capitol Console
  74. Music Angel
  75. What is the version of 45
  76. Aikido for guitar?
  77. Heathkit potted power transformer question
  78. Thermionic Cooling?
  79. What have the finest sound, the PX4 or the 45 ?
  80. value of a cap between driver tube and output tubes
  81. do matched pair (or maybe a quad) output tubes "aged" at the same rate?
  82. Mini EL84 Amp Done
  83. Overcoming Miller
  84. Heathkit Schematic model AA-50 needed
  85. Help me choose please
  86. Mono Class A SE Schematics
  87. Irish DIY Meet.
  88. Sizing PP OPT
  89. 6BQ5/EL90 guitar amp schematics wanted
  90. Do SE transfomers get hot?
  91. Aikido Questions
  92. LTP with interstage trafo
  93. 6BQ5 Push-Pull amplifier
  94. Amplifier input
  95. C#@$ quality 6L6EH's
  96. Mains toroids appear to be great for audio
  97. High bias point.
  98. ebay amp
  99. GU 50 output modification
  100. 6C41Cs Class-A PP
  101. My First Big Amp
  102. sv572-10
  103. Stupid PAS-2 Pot Questions
  104. Old electronics articles
  105. UL Feedback
  106. who know fd23 and fd422 tubes?
  107. Laptop amplifier
  108. Thoughts Of Modifying My First Tube Amp.
  109. Quick question for Eli Duttman (or others!)
  110. Blackened GZ32 glass envelopes
  111. Are these vintage vacuum tubes suitable.....
  112. Tube XP8109-02?!
  113. peak current 300B heater with start up
  114. Microphonic phono preamplifier
  115. Pentode Plate Load
  116. what monoblocks to build?
  117. All tube direct box
  118. max b+ for 6V6
  119. What speakers to go with tubes ??
  120. Bluenote Koala Tube CD Player
  121. OPTs and power for bi-amping
  122. Quick And Dirty ~75W Guitar Amp
  123. Old Diodes
  124. Father, I abused my Leak S/20
  125. 6688/E180F line stage?
  126. Variable feedback to enhance damping factor at low frequency
  127. Need assistance with picking the right Edcor audio transformer
  128. Critique my first design
  129. Biamping, phase of output?
  130. Ground star
  131. op-points for 27 pre...?
  132. Opinions/Experience of Toroidal valve amps
  133. hum, no way to get rid of it
  134. How to adjust my circuit for frequency response?
  135. Input Tubes?
  136. 6BG6 = 6L6GC with top cap - cheap!
  137. Maida Regulators Redux
  138. ground of DC bias supply
  139. does anyone the website for yaqin/mr. liung/music angel amps?
  140. plate load ccs ala gary p question
  141. Books for newbe
  142. 6AS7 OTL
  143. n00b phono preamp troubleshooting..
  144. TubelabSE - Anyone built?
  145. any example of SE designs using GM70?
  146. Shunt regulator question
  147. Any RH807 builders?
  148. Replacing multi-section caps with multiple caps?
  149. Recycle an Eico HFT-90 for a preamp
  150. EL84 PP output transformer for 6L6 PP class A
  151. Jensen PIO capacitor burn in
  152. toroid psu, weird results...
  153. Squeaky Noise in ARC Dual 75
  154. EL84 mod questions
  155. Measuring DC at preamp output
  156. Is Northern Electric the NEW W.E.?
  157. Burnt Woodside STA35 valve amp... Help!
  158. My tube preamplifier project
  159. Ponderings on hybrid 300B
  160. Maida Regulator Parts
  161. anyone familiar with the 211/vt4c circuit from Fi Primer?
  162. Calculating operating points of two DC stages
  163. Advice for retubing VTL Ichiban`s
  164. Need help
  165. Art Audio Kit on Common Ground Magazine
  166. Advice for retubing VTL Ichiban`s
  167. fisher 800c intermitant hum
  168. calling Yves....
  169. X10 Pre
  170. NEW KT66 - 6AU6 single ended
  171. mechanical hum
  172. Big valve preamp
  173. Question about biasing heater above cathode in a direct coupled circuit.
  174. center tapped choke inverter
  175. Guitar tube pre DIY suggestions..?
  176. Which One Of These Tube Amps Should I Buy?
  177. Tube Info
  178. Circuit/Equipment Designer
  179. help needed with noise in phono preamp
  180. Pentode driver and IT?
  181. Plate Caps for 832A
  182. 300b advice
  183. Designs on your noob, err, tube
  184. 7788 Triode Curves
  185. EL81/6CJ6 operating point
  186. Separate cathode resistors in push pull output
  187. C3m linestage
  188. Anyone know this 13E1 design...
  189. LTP w/ positive only supply
  190. 6V6 line preamp
  191. The 6P43P russian tube is a EL84 equivalent ??
  192. Ixys IXCP10M45s IC
  193. Help with hybrid mosfet valve amp
  194. Substitute for 6gw8 in Heathkit aa-32
  195. U-Follower: Output from Cathode or Plate?
  196. Getting rid of oscillations in the preamp
  197. has anyone used the 4-125A in SE amp ?
  198. line preamp using 6SN7 instead of 12AU7
  199. 3-pong conversion for Acoustic amplifier
  200. 6v6pp design
  201. CCS Plate Load
  202. All tube voltage doubler
  203. best value/performance ECC83 on market
  204. Help needed for my preamp
  205. 6H6p cascode differential driving 2A3 PP
  206. Best phono / line preamp
  207. Point to Point
  208. gain curve questions
  209. Questions concerning Aikido Line amp
  210. Partial cathode bypass to effect a treble boost.
  211. SE bass
  212. choke orientation
  213. Musical Fidelity X-PRE schematic
  214. Circuitmaker Spice question
  215. Trouble with a paraphase PI
  216. 27 pre PS question..
  217. 6AV5 g2 driver
  218. Calculate PSU output impedance?
  219. Output stage biasing, with the driver stage
  220. tube pedal plate voltages?
  221. grounding and 12AV6 diodes
  222. 6as7 Pse
  223. Looking for datasheets
  224. Ping Albert from Canada
  225. Old Tektronix booklet
  226. fisher 800c phase inverter adjustment 2
  227. Quick Transformer Question
  228. Power supply for Heathkit
  229. low-power output tube quality
  230. Conn Caprice organ
  231. Conservation of tubes
  232. Brimar EM87
  233. Tube sockets without the ceramic carrier.
  234. SET with tube-based CCS???
  235. fisher 800c modifications
  236. Bottlehead meet.
  237. Tie cathode to heater??
  238. anyone seen it tried like this?
  239. What do people think of the SETH 2A3 PP?
  240. Very high plate voltage EL34 amp
  241. How About Bridging SE
  242. Fisher 800c Has Odd Cathode Reading
  243. What part of DIY do you LOVE?
  244. Priboi tweakers ?
  245. 5751 and 12ax7
  246. LM317 + ceramic cap Q
  247. Derive Triode Curves from Pentode Curves?
  248. 7701 distortion device?
  249. Looking for the perfect giftshop
  250. 300b

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