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  1. PP Output Trafo Measurement
  2. push pull balancing
  3. New issue Mullard Tubes
  4. Help on triode
  5. 5 Volt Damper Diodes?
  6. Please help diagnose preamp problem
  7. 6N1/6N3 substitution
  8. Cathode feedback and input impedance
  9. Optimal ripple voltage on b+ supply
  10. Setup suggestion between DAC-AH and ST-70
  11. Simple Low Voltage Tube Preamp?
  12. Anyone built this 100W GEC amp? How is the sound?
  13. Does anyone have VT150 schematic?
  14. Ignition Coil Toobe Amplifier
  15. Voltage swing of Heffa?
  16. All pentode PP amp?
  17. GZ34 anode load resistor calculation - help?
  18. Capacitor choice for attached schematic
  19. The sound of... tubes !
  20. All quiet on the SN front - recommended choice of tubes
  21. Moscode 600 hum/turn off thump
  22. Tube Tester Resto Basics
  23. Marshall 100v 8100U Guitar Amp Hums
  24. What's the simple killer tube amp? Anyone?
  25. Help - CFB in a KT88 SE amp
  26. Any Russian speakers here?
  27. 6av6 Diode use?
  28. Power Supply
  29. Choke rating for choke input duty
  30. drawing a loadline for a power stage EL34 tube.
  31. Experiencing problems to insert tubes
  32. Preamp signal wiring ideas ?
  33. el34PP circuit evaluation!!
  34. "Re-Forming" Caps on Old Tube Amp
  35. Gary Pimm website?
  36. Haltron (UK), Trigon (UK) and Ultron (germany) ECC83 tubes info request.
  37. Audio Research D150 bias setting
  38. Cathodyne phase splitter with CCS?
  39. Has anyone tried 2 x 6550 100W amp?
  40. modelling PSU for Aikido
  41. 27 head phone amp or.??
  42. New Chassis Fabrication Pics and Capacitor Question
  43. Replacing old caps in the SP8 pre-amp
  44. Tube choice for Class A2
  45. hybrid graetz in PSUDII
  46. 6C45P Spud
  47. Philips ECG 12AX7WA or GE 5751 ?? Opinions, please.
  48. Single Ended EL34 Amp
  49. Rp / Rk on Aikido preamp
  50. hum in amp!
  51. Looking for a 83 rectifier model
  52. Advice wanted on ebay SET amps
  53. Resistors for ultralinear-to-triode conversion
  54. Gary Pimm
  55. resistor values for lifting ground AND LED
  56. output transformer impedance choices
  57. Feedback disc recording amp
  58. 6bm8/ECL82 vs EL84
  59. B+ filter caps
  60. (Newbie) CSS Question
  61. 6P15P Tubes: Push Pull Possible?
  62. Tube X-ref list ??
  63. AVO tube tester spares
  64. Add gain before or after the phase splitter?
  65. ping SY: Red Light LED question
  66. Greinacher voltage multiplier
  67. Dead channel
  68. Euphonia is back!
  69. What's the best 417A & 437A?
  70. Eico ST70 OPT / Schematic Question
  71. Is this feasible?
  72. Repairing 805 tubes
  73. jadis defy 7 help
  74. 6n1p Screen
  75. Mc275ce
  76. Are these tubes are the same?
  77. "King of tube(s) for line-stages"
  78. Acoustic Plan PhonoMaster
  79. Heathkit AA-81 schematic
  80. has anyone kept a copy of gpimm's latest self-biasing CCS?
  81. How to wire inductor - s and n
  82. Rogers Cadet III schematics Corrections
  83. Hickok TV-7/U restoration advice needed.
  84. Rogers Cadet III to SY's Red Light District or Gingertubes's Baby Huey
  85. 24v Aikido for newb.
  86. Powering Up Old Tube Amps/Receivers
  87. preliminary schematic drawing rev.1a
  88. Not a typical MKIII Dynaco.
  89. mosfet buffer for power stage
  90. EI KT-90 news
  91. 304TL based Class A
  92. Purchasing NOS Tubes
  93. tube power supply design resources
  94. High Voltage Regulator Design
  95. max. output for two 5881 tubes?
  96. Excessive current draw in Fender Deville
  97. driving your power stage
  98. Need schematic Cary Audio SLP-70 preamp
  99. Bridge-balanced amplifiers
  100. Tell-tale signs of good feedback usage?
  101. Any mid priced SE transformers around?
  102. Bias resistor
  103. Some sneek peeks
  104. Old radio with 4 pin sockets, info?
  105. need help on pot tapers
  106. A typical KT88 tubes
  107. amplifier for unknown output transformers?
  108. vista audio
  109. CV4014 and 5650 - any audio application of these tubes?
  110. SVP-PRO schematic
  111. Looking for a good source for attenuators
  112. Center-tap to ground?
  113. 6n1p-ev operating points
  114. where to find old pot's with switch built in
  115. Maggie refurb project
  116. Parafeed output
  117. Hirtel junior stereo italian tube amp
  118. power supply help
  119. 7189/7189A Problem
  120. Glow modulation tubes
  121. Transformer Hum leaks to Speakers
  122. EAR Yoshino V20 Amplifier
  123. Repair a tube tester?
  124. starting PP - 6p3s
  125. 6BL7 rA in PP
  126. Why such high plate voltage in 2A3 DRD?
  127. to parafeed or not to parafeed that is the question
  128. Lowering voltage output of transformer
  129. Using EL34 in a line stage
  130. peerless transfomer information
  131. Output transformer design for SS amp
  132. CD source fortube amp
  133. What's the SIMPLEST 50W or higher Amp Schematic but best sound you've heard ?
  134. BIG tube amplifier, two qbl5/3500 tubes
  135. EL34 or 6L6 mono help me please!!
  136. Why don't we use output tubes as cathode followers?
  137. 6C33 driver recommendations
  138. 100watt power, fixed gain far cleaner than Marshall amp any sugestion
  139. Minimum Zener Current with Pass Device
  140. Favorite easy 6V6 push-pull circuit?
  141. Tubecad soft-clipping circuit
  142. broskie voltage regulator
  143. E88CC dissipation in Aikido
  144. Magnavox 6BQ5/EL84 and Mr. Gabe
  145. Aikido hum has me stumped !!!!
  146. 5842 and 5842 WA for 300B
  147. Basic tube combination question.
  148. Resistive ps voltage follower
  149. First time DIY tube
  150. Need help with hum and faint left channel on my S5 Electronics kit
  151. grid impedence of paralleled tubes in push pull
  152. Fender Bassman PT Rewind
  153. rectification
  154. 6AU6 Varieties
  155. EMI tubes (British made)
  156. valve wear symptoms?
  157. Standby switch, snap, crackle, pop?
  158. Aikido PSU questions (Bas Boards)
  159. one tube amps
  160. Intermittant Clicking
  161. How to solve noise/storing/on car Tube Amp ? any Schematic ?
  162. Series MOSFET regulator better with just voltage ref on gate or with error amp?
  163. Tube spice models
  164. Audible Illusions Modulus faulty?
  165. Ei Tubes..
  166. more output transformer questions
  167. 6C33 design comments?
  168. Current production EL34
  169. Impedance matching
  170. question about multiple input transformer in same tube mic pre.
  171. One tube preamp
  172. Help 6G-E12A pinout??
  173. DIY Jadis JA 30 power amp PCB
  174. output tube options
  175. wanted: accurate 257 tube tester manual
  176. Developing a "universal" tube power supply PCB
  177. Looking for a Cover....
  178. EL34 Sound
  179. Pinout ECC83 to ECC808
  180. How to convert S5 K-12g kit to dual mono?
  181. EL84 + EF86
  182. Tube amps, power and speaker impedance
  183. How to figure output Z of SRPP?
  184. Rose RV23 preamp
  185. Wanted RIAA stage with 6SN7
  186. Help with PSU Design
  187. Tetrode output stage
  188. New amplifier project -my layout
  189. jadis ja 30
  190. Aikido Attenuator kit question
  191. Fender Delux Reverb AB763
  192. Weird crackling sound without B+ applied
  193. More Aikido questions...........
  194. 6C41C in OTL?
  195. Looking for Voss-Ellis article
  196. 807 E-Linear
  197. ECC86 model
  198. Tube ID & Code Help Needed
  199. PS Decoupling question
  200. Need help in trouble-shooting my AES Sixpacs amp
  201. Space between power tubes
  202. Schematic please? SRPP with current source cathode follower
  203. Series connecting output Transformers.
  204. 6C45-Pi battery RIAA/Pre sugestions?
  205. Good News For EI Tube Fans
  206. My 300B project...
  207. building Single Ended amps
  208. Higher power amps using 807's or 1625's
  209. Project using Eico ST 70 Iron?
  210. M-1 amplifier kit - full documentation in public domain now
  211. Sus tubes ?
  212. Adjusting BIAS
  213. "Shrine" SE Amp using 6AH6 and 1625
  214. MFA Lumi - possible to "un-darken" the sound signature?
  215. Output transformers resistance
  216. Aikido heaters
  217. Return to Aikido Hum issues
  218. Looking for Schematic 6550 tube amp triode mode more than 35Watt ?
  219. Compare the sound of 6550 amp to a 6L6 amp
  220. Biasing a valve amp
  221. Scoundrel days
  222. Counterpoint SA100 one channel doesn´t work
  223. Hepl me circuit 6h30
  224. 6LR8 Amp Preliminary Questions
  225. Another 6L6 schematic
  226. 6S19P Amplifier
  227. An idea for a PL84 amp with toroidal interstage.
  228. 417A-300B Plate Choke or Interstage Coupled?
  229. Identifying an unknown tube
  230. Looking for EL34 PP Schematic Amp ? at least 35Watt
  231. ADVICE on Valvestate crunch, but all tube instead.
  232. Help diagnosing noise
  233. st70 blowout
  234. Gu81-m
  235. 6c4 pre-amp circuit
  236. 6SN7 6.3 V heater supply
  237. 2C26 &E1148's
  238. First ECL82 amp probs.
  239. JE Labs ST2A3DX
  240. Punchy 813 Poweramp
  241. Hum in AE K502 or K12m
  242. SE 6SN7 amp....
  243. Audio Innovations 800C schematic or even better service manual?
  244. Music angel amps
  245. Low gain 9-pin tubes for Aikido?
  246. JADIS ORCHESTRA IN PCB (original is hardwire)
  247. Blown Valve in ARC VT50 - help
  248. LAMM ML3 *Signature*
  249. Diode for DC heater
  250. Calculating shunt reg source impedance

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