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  1. tube amp hum........normal or suggested fix?
  2. Building a beast: Stereo EL84 auto bias PP tube amp
  3. Becker Brescia auto radio
  4. Double feedback pentode Power Stage
  5. Anyone Using Guiguang 300b tubes?
  6. Where to get Audio Note Gaku-On service manual?
  7. Sanity Check - Input Transformer Overshoot
  8. TOA HA-355 vintage tube PA amp schematic
  9. EL34 PushPull UL Amp
  10. 6L6G emission too high
  11. Need help designing BIAS circuit for old Bell amp
  12. Heathkit A-5A 6L6 PP Integrated Amp
  13. Where to put the meter
  14. Radii GS-40pp
  15. Concept dilemma (pre/pwr/spud content)
  16. What to do with these Eimac tubes?
  17. Driving 211 with VT25 or EL34?
  18. DIY AMP start project - Help choosing one
  19. Pilot 248B Amp with weak channel
  20. 6H30 VA stage?
  21. What is the best way to connect DC filaments?
  22. suggestions for a parallel feed 45 amp?
  23. Counterpoint SA 5.1 repairs
  24. The Morgan Jones mini tube headphone Amplifier
  25. Borbely headphone amp
  26. Found An Amplifier In My Basement I'd Forgotten About & Learn It's Sought After
  27. Floating OPT oscilloscope measuraments
  28. I Wasn't Away That Long, What's WIth The Price Hikes On All My Old Toys?
  29. Channel voltage mismatch
  30. OS70/1750 datasheets
  31. Beautiful Chassis
  32. 6A4, 46 and 47...excellent sound tubes !!!!
  33. Is it Overkill to use Duelund Caps in Power Stage (Counterpoint SA-5.1)
  34. Quicksilver M135 Schematic?
  35. recognize this old amp?
  36. grey fogging inside 6sn7
  37. Point to point or pcb?
  38. Quad query
  39. Fixing a Velleman K4040 - Buzz HIss Crackle Blown Tubes
  40. Found Original Genalex 12AX7..Need Advice..
  41. OPT power rating and amplifier power
  42. 6BG6-GA
  43. EL84 driving EL84 SET with fixed bias
  44. P2P 6CG7 Input Buffer
  45. 865 in triode mode...anyone ever tried it?
  46. PP KT88 Amp Low frequency Ringing
  47. World audio designs kel34
  48. Glassware Audio Design
  49. 2A3 mounted horizontally
  50. from tube amp to fm reciever
  51. diy tube amp
  52. Cary 805ae xlr option
  53. ST-70 mono makeover
  54. breaking in audio capacitors
  55. Question about 6V6GT amp schematic
  56. Sherwood Schematic
  57. Ever hear of a D7L1 or D7L3 YR7 tube?
  58. Psvane Replica RCA 2A3 tube - WR2A3
  59. 845 Driver Circuit
  60. ADJUSTABLE BIAS MOD KIT
  61. Gold Lion B749 12au7 Thoughts?
  62. Siliconray SRK 09 tube amp kit help
  63. Quantum minstrel
  64. Does anyone know how John Lee Hooker recorded this? (1949)
  65. Please Identify these black capacitors.
  66. New Tubes too silent (6P15P)
  67. best sounding & value amp kits/designs?
  68. Custom Woodwork For Tube Amp
  69. Tube 2E22 in triode mode
  70. Has anyone built an OTL amp with switch mode power supplies.
  71. Altec 15067 transformers
  72. Some interesting findings with transformers
  73. Bogen KO-60 Output Iron
  74. What would you do with Scott 222D IRON?
  75. Aikido vs CCDA
  76. wiring color code
  77. Maverick Audio TubeMagic D1 DAC
  78. Is one gz34 enough
  79. Edcor OPT opinions
  80. mengyue mini/ming da el34b
  81. I need a tube buffer circuit using a 12au7
  82. Stereo Amplifier Wood Enclosure
  83. What is the theoretical advantage of direct heated triodes?
  84. 6AS6 is useful for audio ?
  85. GM-70 design approach
  86. Ultimate emotion core material ( types of silicon steel , Permalloy or Amorphous etc)
  87. Looking to build my first tube amplifier
  88. Tube/SS opamp
  89. Biasing 6CA7/EL34 in Luxman LX33
  90. John Broskie MIA again?
  91. combine filament winding for rectifier
  92. HYBRID TUBE CFP
  93. 9302 Maggie Rebuild
  94. Pyramid-IX monoblock, 200W from 4x GU-50
  95. Suggestions of phono stage to build
  96. Do power transformers affect sound quality?
  97. Help with a Velleman K4040 ...
  98. Capacitor replacement confusion
  99. RCA PA Amplifer, Input Transformers
  100. Channel imbalance Xiang Sheng DAC-01
  101. ARC M100s
  102. pros & cons of current mirror to balance a push-pull ?
  103. Wright Audio WLA10 help needed
  104. The Best tube/valve sound!?
  105. Mcintosh MC1000 and Ming Da MC300-PRE
  106. Operating Modern 845s
  107. The Transcendent Sound Son of Beast OTL Master/Mod Thread.
  108. Neutralizing An Amplifier
  109. Stacked speakers driven by an SEP amp?
  110. Tube buffer suggestion for LM4702 amplifier?
  111. FWB Voltage Doubler with -Bias supply
  112. 500V SE pentode design
  113. single ended transformer driving 32ohm speaker
  114. uC based Tube Curve Tracer Kit - Experts Opinion ?
  115. 250K Attenuator
  116. Possible to drive PP EL34-triodes with a cathodyne phase-splitter?
  117. Daughters POD amp 13EM7 Pics
  118. Calculating Ripple Current with PSUD2
  119. Channel problem on 45 converted amp
  120. Want to make a tube preamp
  121. Marantz TC-5 choke value
  122. diference between schematics and pcb layout
  123. Would this work?
  124. Can old resistors go bad?
  125. Strange output tube behaviour
  126. Practical question: toroidal transformer / heater current / kt120
  127. Morgan Jones Power supply cap values
  128. Can use a ballast for a PSU??
  129. Looking for a OTL tube headphone amp design
  130. Relative Humidity Attenuating HF
  131. Parallel Output transformer question
  132. Need help to ID a tube...
  133. Modifications to Sennheiser VKS 203
  134. Onix SP3 integrated amp latest schematic
  135. Omit sp3 integrated amp latest schematic
  136. Help: Western Electric 102A Tube Datasheet and Test Settings
  137. Power and output transformer separated from amplifier
  138. discrete and simple VCCS
  139. heater wiring question
  140. What is the deal with Welborne Labs?
  141. Center Channel
  142. input stage problem help please!
  143. Tube Tips/Tricks for beginners
  144. Any skilled custom tube amplifier builders out there?
  145. Are these tubes really matched?
  146. Single Ended Amp
  147. Mighty Midget Problems
  148. Run the tube stuff in your car
  149. Jackson 648 test for 6973
  150. Space-charge tetrodes in Inverted Mode
  151. choosing input valve
  152. Rectifier characteristics
  153. Glass-ware?
  154. 5751 Mil spec tubes vrs 12AX7
  155. 47 pentode...fabulous sound !!!!
  156. Aikido preamp transformer question
  157. 40's tube receiver question
  158. W5m transformer
  159. Dual voltage PS filtering.
  160. OD3 150V tube regulator
  161. Fisher 500c
  162. Help with quad cap upgrade
  163. low voltage hybrid power amplifier
  164. Morgan Jones Kapacitors
  165. Which IR LED?
  166. Tube Frequency Response
  167. Big B+ voltage drop using diode rectifier.
  168. Triode ST70 kit schematic?
  169. 6AU6 replacement
  170. IT in cathode for driver class A2 tube
  171. Bogen MX30 Output Transformers
  172. Worlds Most Expensive Tube Amp !!!
  173. Blown screen resistor
  174. Blown screen resistor
  175. To ground plane or not?
  176. 5Z4PA Alternative?
  177. Question about chassis ground
  178. 6337- wtf is it?
  179. need ideers for a 6 channel amp
  180. sv572 transformer headache
  181. 6C33C / 6EM7
  182. 6146 TUBES ?
  183. Impedance matching
  184. QRP03 - Tube Buffered Gainclone
  185. Amp Cage Fababricators?
  186. PP KT88, Need help!
  187. Question regarding rectifier tube replacement
  188. Harmon Kardon A500
  189. Double triode 6SN7
  190. Tank's DIY tube preamp
  191. C core OPT for PP EL84
  192. amp diagram for KT88 and 300B on the same circuit
  193. Yaqin MS 34 D
  194. Tube buffer for amplifier with LM1875
  195. What is the best ?
  196. DUKANE tube PA help
  197. Old tube? HELP RSE NP-7V-12 168810
  198. My first tube power amp
  199. Another mystery tube:
  200. Quad 22 Wiring
  201. Radford phase splitter again
  202. hookup wire source
  203. MCU adjustable fixed bias
  204. vr tube / glow tube as filter?
  205. Using phono stage only of preamp
  206. Correct settings for EBL21 and other tube on Hickok 539C
  207. Decca Portable Record Player model DPS8 Filter cap replacment
  208. 6V6 vs EL84 for output
  209. Realistic HK 210/Acrosound Stereo 120 Amp Schmatic/Manual Needed
  210. 2A3 with 12AT7
  211. Voltage rating of plate gyrator MOSFET
  212. Quad22 like preamplifier kit
  213. Push-pull implemented with KT88
  214. My QUAD 2 Restoration
  215. DIY High Power Car Tube Amp
  216. Perished insulation on transformer secondary - seems shorted. What can I do here?
  217. Need advice and help with new build
  218. Suggestions for a cheap Stereo Phono tube preamp based upon this power transformer?
  219. Determining imput impedence of a preamp line stage
  220. Newb question on 12AU7 gain stage
  221. Valve Preamplifier Help
  222. OPT choices - 6L6 PPP
  223. MESA STRATEGY 400
  224. Shuguang, Beijing or Shanghai EL84 ?
  225. CJ PV-5 tubes
  226. Reference tube amp kit, <20 watts for under $1,000?
  227. ccs power supply 310a
  228. At what point does it become a "hybrid" ?
  229. Line filters
  230. Step-up MC transformer for Audio Research SP 6C
  231. Psud help.
  232. MC Step-Up OTL Stage (grounded-grid) for MM RIAA Head Amps
  233. Repurposing heathkit s-2 electronic switch
  234. output cap bypass?
  235. 6e5p & 6c41 tube amplifier
  236. Looking for my first tube amp...
  237. Acceptable variance in plate voltage?
  238. SRPP bias calculation
  239. 6A3 test, what am I doing wrong?
  240. Goldline Phono Tube Pre Amp PCB - Analog Metric
  241. New Copper Nanoparticle Solder - Breakthrough?
  242. SRPP as a final stage? What do you think?
  243. Troughline Transmissionline theory explanation needed
  244. Help with odd bias method on Crown tube amp
  245. preamp output impedance matching
  246. KT66 Woes
  247. Help with Calibration: Hickok Western Electric KS-15750-L1 Tubes Tester
  248. Cascode driver
  249. 2a3 DC coupled
  250. ECF/PCF 200, 201 B10B 10Pin Tubes

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