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

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