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  1. building Single Ended amps
  2. Higher power amps using 807's or 1625's
  3. Project using Eico ST 70 Iron?
  4. M-1 amplifier kit - full documentation in public domain now
  5. Sus tubes ?
  6. Adjusting BIAS
  7. "Shrine" SE Amp using 6AH6 and 1625
  8. MFA Lumi - possible to "un-darken" the sound signature?
  9. Output transformers resistance
  10. Aikido heaters
  11. Return to Aikido Hum issues
  12. Looking for Schematic 6550 tube amp triode mode more than 35Watt ?
  13. Compare the sound of 6550 amp to a 6L6 amp
  14. Biasing a valve amp
  15. Scoundrel days
  16. Counterpoint SA100 one channel doesn´t work
  17. Hepl me circuit 6h30
  18. 6LR8 Amp Preliminary Questions
  19. Another 6L6 schematic
  20. 6S19P Amplifier
  21. An idea for a PL84 amp with toroidal interstage.
  22. 417A-300B Plate Choke or Interstage Coupled?
  23. Identifying an unknown tube
  24. Looking for EL34 PP Schematic Amp ? at least 35Watt
  25. Help diagnosing noise
  26. st70 blowout
  27. Gu81-m
  28. 6c4 pre-amp circuit
  29. 6SN7 6.3 V heater supply
  30. 2C26 &E1148's
  31. First ECL82 amp probs.
  32. JE Labs ST2A3DX
  33. Punchy 813 Poweramp
  34. Hum in AE K502 or K12m
  35. SE 6SN7 amp....
  36. Audio Innovations 800C schematic or even better service manual?
  37. Music angel amps
  38. Low gain 9-pin tubes for Aikido?
  39. JADIS ORCHESTRA IN PCB (original is hardwire)
  40. Blown Valve in ARC VT50 - help
  41. LAMM ML3 *Signature*
  42. Diode for DC heater
  43. Calculating shunt reg source impedance
  44. Marant 7c preamp diyzone project
  45. PSU Caps for an EL34 SET
  46. high gain 12ax7 preamp from scratch?
  47. IXYS 10M45 chip CCS
  48. Octal Aikido? What tubes?
  49. Tube power supply questions
  50. 6J5 input swing
  51. Checking spice model plate curve accuracy
  52. How many Ohm for triode strapping?
  53. Power supply for Heathkit WA-P2 pre-amplifier
  54. Bogen MX-60a tune-up
  55. dynaco st35 clone problem
  56. Edcor OPT's
  57. ECC40 cascode
  58. Air Vane RIAA Tuning Question
  59. Tube Noob! need help with tubes lots of tubes
  60. bias adjust installation, bogen mo-100a mo 100a quicksilver
  61. 6EM7 Amp
  62. 40mu tube preamp suggestions?
  63. Safe installation of interstage
  64. I've built some amps, need suggestions for a DIY preamp or line stage
  65. CRD diode CCS any good <1mA?
  66. Help fixing a Border Patrol Power Amp
  67. TAD-60 schematics / mods
  68. Selling tube amps
  69. Drd 300b Pse
  70. Hammond Transformer Winding Resistance -- 369GX
  71. The meaning of VA in a TX
  72. Ucl85
  73. Best way to measure cathode follower current
  74. Neuman U47
  75. OT: Season's greetings to all
  76. Anyone have experience with a 6AN4...?
  77. L-pad instead of H-pad??
  78. valve regulated psu
  79. looking for metal enclosure for custom preamps
  80. basie+aikido preamp
  81. Input Switch?
  82. Help me please
  83. Congratulations, you just built a $2K antenna !
  84. Sonic Frontiers Line 2, please help?
  85. Sovtec 12AX7
  86. removing AC Hum on Aikido????
  87. Stereo Build - Mikaels KT88
  88. 6V6GT scematic, any good, comments?
  89. 807 vs 811A output: Sonic preference?
  90. Cheap PP OPTs
  91. Mc C-22 Ce
  92. Transformer Coupled Linestage
  93. 6CY7 Variants
  94. EZ81 rectifier noise
  95. Any good Output Transformers from China?
  96. Solid Core or Multistrand?
  97. Aikido - alive and kicking butt (not mine!)
  98. Dead Copland CTA-501
  99. Is the E86L the industrial sister of the EL86?
  100. Hammond 1630SEA, worth trying?
  101. Using Gas Regulators
  102. Cheap and Chinese KT88 SE amp
  103. Cary v12 -> V12r Conversion Questions
  104. 15 watts loud enough?
  105. ST70 hybrid finally up and running !!
  106. The Making of a Triode
  107. Spice models
  108. HV SS bench top power supply, advice needed
  109. A new Aikido is born - and kicking butt!
  110. Preamp - DIY vs Audio Research (or similar)
  111. Stromberg-Carlson 433 : Add standby or not?
  112. All-tube digital clock
  113. audible illusions dual mono preamp
  114. Siemens/Klangfim 6.4 mono question..?
  115. James 6123 OPT Wiring Help
  116. Next Bogen Conversion soon - need phase splitter advice
  117. A basic question regarding transformer laminations
  118. TOO many volts ????!!!!
  119. Dynaco Mark VI
  120. Frankenstein
  121. Unity buffer from 7-pin triode?
  122. Heathkit WA-P2 preamp
  123. Internal shield on 6922 dual triode
  124. 6cl3, 6cj3, 6dw4, 6ck3, 6ay3
  125. 418a
  126. Is it worth biasing with a distortion analyzer ???
  127. Usefulness of 6X8 tube?
  128. reducing hum in SET amps
  129. dynamic loadline
  130. Designing Transformer-Coupled Circuits...
  131. Tube-amp power issues
  132. SCA-35 Dynaco
  133. Q on voltage swing
  134. Buzz on preamp
  135. Help- I'm new!
  136. tube phono stage
  137. Schematic for Gm70!Where to find it!
  138. getting the specs on a transformer
  139. Nixie bargraph as a audio VU-meter
  140. Unique or odd uses for the diyAudio CCS boards
  141. Balanced tube preamp for class D power amps.
  142. 117v heater tube 117n7
  143. bypassing the plate-load
  144. Is this OK for a heater supply?
  145. which gauge wire for PSU????
  146. Citation II OPT?
  147. A new project, Blue Velvet Pre Amp is ready and rocks ! ! !
  148. Suggested budget pwr sply topologies?
  149. Battery for Cathode Voltage?
  150. Calbest help
  151. PO'ed at RFI
  152. 12B4-A Linestage
  153. Relay Attenuator for tube amp
  154. Aikido and K-1000 headphones?
  155. post poweramp power attenuator
  156. preamp tube for metal
  157. Favorite Output Tube?
  158. CCS Grid Bias
  159. Ring of two CCS for differential triode amp - stability?
  160. Unstacking a transformer...
  161. interconnect cable 15' long
  162. Citation II oscillating, Uh oh
  163. Regulated PowerSupply for Frank's 6SN7 Preamp
  164. Regulating G2 in Pentode Operation
  165. WE310A, a confusing issue
  166. Naming conventions
  167. Newbie: Powering up Tube Amp
  168. preference between 5842 and 6c45pi
  169. Help! first tube pre-amp with 12ax7
  170. S11E12 / 12E1: best operating point ?
  171. 6j5 trasformer coupled driver/splitter
  172. A new audio tube
  173. heretical unity gain OUTPUT stage...
  174. LL1630 Pre amp
  175. New Jensen caps has no bass in..Simple EL84PP
  176. EIMAC toobz : What sort of PSU ?
  177. Filament Transformer for 26 DHT
  178. Valve Pre for Chip Amp
  179. To hell with pride. I need help w. Grounded grid Pre-amp
  180. signal wiring / chassis grounding - Aikido
  181. Power rating for triode/pentode resistors
  182. Unity coupled power amp
  183. 6BX7 Outputs
  184. DIY Preamp for use with Dynaco ST70
  185. +B Power Supply Basics
  186. Tubes and their sweet spots.
  187. How to accomplish local feedback in pp amp ?
  188. Telefunken 5094
  189. Coupling caps size with grid choke?
  190. My first audio project
  191. Relationship Between Inductance And Current In Filter Choke
  192. Harmony H303A
  193. 6C4C - 6S4S - 6B4G op points?
  194. anyone mod a tube ultragain in here?
  195. EL84s glowing red
  196. Found a power transformer, what to do with it?
  197. Output section on preamp questions/breakdown.
  198. Transformer coupled 6AS7/6080
  199. Single Tube RIAA preamp too good to be true?
  200. What to make?
  201. LPT with low µ triodes?
  202. Ground questions
  203. Help! Upgrade a Music Angel KT88
  204. Need schematic for EL84 PSE
  205. Old OTL circuite question
  206. sub out in my 300b se? Help me please.
  207. Interstage OPT to drive 6V6 pp amplifier
  208. Voltage label on schematics...
  209. mystery purchase of the day
  210. What about the Eimac 3-500z?
  211. How much DC offset can a tube preamp take?
  212. Low voltage drop pass tube
  213. Convergent Legend Preamp
  214. vintage tube amp repair help
  215. Lasers, Tubes, and PCB
  216. 76 operating point/max plate rating?
  217. Mullard Made Tube Source Query
  218. SE Amp with NO HUM
  219. Frrank's 6Sn7 preamp...take out coupling cap??
  220. Need Schematic or help Newcomb AV-10 turntable tube amp
  221. Tube kits for beginners
  222. Lectron JH50 Tube Bias
  223. Removing LEDs from chinese amp
  224. Project madness
  225. chinese and tube Depot amps?
  226. eml 520 v2 info
  227. Potted Transformer Enclosure Suppliers?
  228. Rogers Cadet III Phono Stage
  229. Modding Roberts/Akai mono block tube amps
  230. Full-wave bridge
  231. Output transformers and frequency response
  232. Class A2 SET using source follower driver
  233. Rectifier that drops lots of volts?
  234. switch snubber on preamp
  235. HV supply please comment before building
  236. This is cool
  237. Gold Lion KT88 Reissues
  238. 6F8G's any good?
  239. Matching capacitors
  240. Tung-Sol (new production) 6550s
  241. Curves, curves, and more curves
  242. Help for new design..
  243. OTL SE - Help Wanted with Idea
  244. OPTs causing crosstalk?
  245. KT88 Usable range
  246. How to change tubes ??? (NEWBIE)
  247. Do I need a Trafo for the HV in my 12AU7 (ECC82)?
  248. Need some help with potentiometer.
  249. Pinout of a UTC CG-422 power transformer
  250. Simple EL34 SET; advice?

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