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  1. Greinacher voltage multiplier
  2. Dead channel
  3. Euphonia is back!
  4. What's the best 417A & 437A?
  5. Eico ST70 OPT / Schematic Question
  6. Is this feasible?
  7. Repairing 805 tubes
  8. jadis defy 7 help
  9. 6n1p Screen
  10. Mc275ce
  11. Are these tubes are the same?
  12. "King of tube(s) for line-stages"
  13. Acoustic Plan PhonoMaster
  14. Heathkit AA-81 schematic
  15. has anyone kept a copy of gpimm's latest self-biasing CCS?
  16. How to wire inductor - s and n
  17. Rogers Cadet III schematics Corrections
  18. Hickok TV-7/U restoration advice needed.
  19. Rogers Cadet III to SY's Red Light District or Gingertubes's Baby Huey
  20. 24v Aikido for newb.
  21. Powering Up Old Tube Amps/Receivers
  22. preliminary schematic drawing rev.1a
  23. Not a typical MKIII Dynaco.
  24. mosfet buffer for power stage
  25. EI KT-90 news
  26. 304TL based Class A
  27. Purchasing NOS Tubes
  28. tube power supply design resources
  29. High Voltage Regulator Design
  30. max. output for two 5881 tubes?
  31. Excessive current draw in Fender Deville
  32. driving your power stage
  33. Need schematic Cary Audio SLP-70 preamp
  34. Bridge-balanced amplifiers
  35. Tell-tale signs of good feedback usage?
  36. Any mid priced SE transformers around?
  37. Bias resistor
  38. Some sneek peeks
  39. Old radio with 4 pin sockets, info?
  40. need help on pot tapers
  41. A typical KT88 tubes
  42. amplifier for unknown output transformers?
  43. vista audio
  44. CV4014 and 5650 - any audio application of these tubes?
  45. SVP-PRO schematic
  46. Looking for a good source for attenuators
  47. Center-tap to ground?
  48. 6n1p-ev operating points
  49. where to find old pot's with switch built in
  50. Maggie refurb project
  51. Parafeed output
  52. Hirtel junior stereo italian tube amp
  53. power supply help
  54. 7189/7189A Problem
  55. Glow modulation tubes
  56. Transformer Hum leaks to Speakers
  57. EAR Yoshino V20 Amplifier
  58. Repair a tube tester?
  59. starting PP - 6p3s
  60. 6BL7 rA in PP
  61. Why such high plate voltage in 2A3 DRD?
  62. to parafeed or not to parafeed that is the question
  63. Lowering voltage output of transformer
  64. Using EL34 in a line stage
  65. peerless transfomer information
  66. Output transformer design for SS amp
  67. CD source fortube amp
  68. What's the SIMPLEST 50W or higher Amp Schematic but best sound you've heard ?
  69. BIG tube amplifier, two qbl5/3500 tubes
  70. EL34 or 6L6 mono help me please!!
  71. Why don't we use output tubes as cathode followers?
  72. 6C33 driver recommendations
  73. 100watt power, fixed gain far cleaner than Marshall amp any sugestion
  74. Minimum Zener Current with Pass Device
  75. Favorite easy 6V6 push-pull circuit?
  76. Tubecad soft-clipping circuit
  77. broskie voltage regulator
  78. E88CC dissipation in Aikido
  79. Magnavox 6BQ5/EL84 and Mr. Gabe
  80. Aikido hum has me stumped !!!!
  81. 5842 and 5842 WA for 300B
  82. Basic tube combination question.
  83. Resistive ps voltage follower
  84. First time DIY tube
  85. Need help with hum and faint left channel on my S5 Electronics kit
  86. grid impedence of paralleled tubes in push pull
  87. Fender Bassman PT Rewind
  88. rectification
  89. 6AU6 Varieties
  90. EMI tubes (British made)
  91. valve wear symptoms?
  92. Standby switch, snap, crackle, pop?
  93. Aikido PSU questions (Bas Boards)
  94. one tube amps
  95. Intermittant Clicking
  96. How to solve noise/storing/on car Tube Amp ? any Schematic ?
  97. Series MOSFET regulator better with just voltage ref on gate or with error amp?
  98. Tube spice models
  99. Audible Illusions Modulus faulty?
  100. Ei Tubes..
  101. more output transformer questions
  102. 6C33 design comments?
  103. Current production EL34
  104. Impedance matching
  105. question about multiple input transformer in same tube mic pre.
  106. One tube preamp
  107. Help 6G-E12A pinout??
  108. DIY Jadis JA 30 power amp PCB
  109. output tube options
  110. wanted: accurate 257 tube tester manual
  111. Developing a "universal" tube power supply PCB
  112. Looking for a Cover....
  113. EL34 Sound
  114. Pinout ECC83 to ECC808
  115. How to convert S5 K-12g kit to dual mono?
  116. EL84 + EF86
  117. Tube amps, power and speaker impedance
  118. How to figure output Z of SRPP?
  119. Rose RV23 preamp
  120. Wanted RIAA stage with 6SN7
  121. Help with PSU Design
  122. Tetrode output stage
  123. New amplifier project -my layout
  124. jadis ja 30
  125. Aikido Attenuator kit question
  126. Fender Delux Reverb AB763
  127. Weird crackling sound without B+ applied
  128. More Aikido questions...........
  129. 6C41C in OTL?
  130. Looking for Voss-Ellis article
  131. 807 E-Linear
  132. ECC86 model
  133. Tube ID & Code Help Needed
  134. PS Decoupling question
  135. Need help in trouble-shooting my AES Sixpacs amp
  136. Space between power tubes
  137. Schematic please? SRPP with current source cathode follower
  138. Series connecting output Transformers.
  139. 6C45-Pi battery RIAA/Pre sugestions?
  140. Good News For EI Tube Fans
  141. My 300B project...
  142. building Single Ended amps
  143. Higher power amps using 807's or 1625's
  144. Project using Eico ST 70 Iron?
  145. M-1 amplifier kit - full documentation in public domain now
  146. Sus tubes ?
  147. Adjusting BIAS
  148. "Shrine" SE Amp using 6AH6 and 1625
  149. MFA Lumi - possible to "un-darken" the sound signature?
  150. Output transformers resistance
  151. Aikido heaters
  152. Return to Aikido Hum issues
  153. Looking for Schematic 6550 tube amp triode mode more than 35Watt ?
  154. Compare the sound of 6550 amp to a 6L6 amp
  155. Biasing a valve amp
  156. Scoundrel days
  157. Counterpoint SA100 one channel doesn´t work
  158. Hepl me circuit 6h30
  159. 6LR8 Amp Preliminary Questions
  160. Another 6L6 schematic
  161. 6S19P Amplifier
  162. An idea for a PL84 amp with toroidal interstage.
  163. 417A-300B Plate Choke or Interstage Coupled?
  164. Identifying an unknown tube
  165. Looking for EL34 PP Schematic Amp ? at least 35Watt
  166. ADVICE on Valvestate crunch, but all tube instead.
  167. Help diagnosing noise
  168. st70 blowout
  169. Gu81-m
  170. 6c4 pre-amp circuit
  171. 6SN7 6.3 V heater supply
  172. 2C26 &E1148's
  173. First ECL82 amp probs.
  174. JE Labs ST2A3DX
  175. Punchy 813 Poweramp
  176. Hum in AE K502 or K12m
  177. SE 6SN7 amp....
  178. Audio Innovations 800C schematic or even better service manual?
  179. Music angel amps
  180. Low gain 9-pin tubes for Aikido?
  181. JADIS ORCHESTRA IN PCB (original is hardwire)
  182. Blown Valve in ARC VT50 - help
  183. LAMM ML3 *Signature*
  184. Diode for DC heater
  185. Calculating shunt reg source impedance
  186. Marant 7c preamp diyzone project
  187. PSU Caps for an EL34 SET
  188. high gain 12ax7 preamp from scratch?
  189. IXYS 10M45 chip CCS
  190. Octal Aikido? What tubes?
  191. Tube power supply questions
  192. 6J5 input swing
  193. Checking spice model plate curve accuracy
  194. How many Ohm for triode strapping?
  195. Power supply for Heathkit WA-P2 pre-amplifier
  196. Bogen MX-60a tune-up
  197. dynaco st35 clone problem
  198. Edcor OPT's
  199. ECC40 cascode
  200. Air Vane RIAA Tuning Question
  201. Tube Noob! need help with tubes lots of tubes
  202. bias adjust installation, bogen mo-100a mo 100a quicksilver
  203. 6EM7 Amp
  204. 40mu tube preamp suggestions?
  205. Safe installation of interstage
  206. I've built some amps, need suggestions for a DIY preamp or line stage
  207. CRD diode CCS any good <1mA?
  208. Help fixing a Border Patrol Power Amp
  209. TAD-60 schematics / mods
  210. Selling tube amps
  211. Drd 300b Pse
  212. Hammond Transformer Winding Resistance -- 369GX
  213. The meaning of VA in a TX
  214. Ucl85
  215. Best way to measure cathode follower current
  216. Neuman U47
  217. OT: Season's greetings to all
  218. Anyone have experience with a 6AN4...?
  219. L-pad instead of H-pad??
  220. valve regulated psu
  221. looking for metal enclosure for custom preamps
  222. basie+aikido preamp
  223. Input Switch?
  224. Help me please
  225. Congratulations, you just built a $2K antenna !
  226. Sonic Frontiers Line 2, please help?
  227. Sovtec 12AX7
  228. removing AC Hum on Aikido????
  229. Stereo Build - Mikaels KT88
  230. 6V6GT scematic, any good, comments?
  231. 807 vs 811A output: Sonic preference?
  232. Cheap PP OPTs
  233. Mc C-22 Ce
  234. Transformer Coupled Linestage
  235. 6CY7 Variants
  236. EZ81 rectifier noise
  237. Any good Output Transformers from China?
  238. Solid Core or Multistrand?
  239. Aikido - alive and kicking butt (not mine!)
  240. Dead Copland CTA-501
  241. Is the E86L the industrial sister of the EL86?
  242. Hammond 1630SEA, worth trying?
  243. Using Gas Regulators
  244. Cheap and Chinese KT88 SE amp
  245. Cary v12 -> V12r Conversion Questions
  246. 15 watts loud enough?
  247. ST70 hybrid finally up and running !!
  248. The Making of a Triode
  249. Spice models
  250. HV SS bench top power supply, advice needed