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  1. EL34 PushPull UL Amp
  2. 6L6G emission too high
  3. Need help designing BIAS circuit for old Bell amp
  4. Heathkit A-5A 6L6 PP Integrated Amp
  5. Where to put the meter
  6. Radii GS-40pp
  7. Concept dilemma (pre/pwr/spud content)
  8. What to do with these Eimac tubes?
  9. Driving 211 with VT25 or EL34?
  10. DIY AMP start project - Help choosing one
  11. Pilot 248B Amp with weak channel
  12. 6H30 VA stage?
  13. What is the best way to connect DC filaments?
  14. suggestions for a parallel feed 45 amp?
  15. Counterpoint SA 5.1 repairs
  16. The Morgan Jones mini tube headphone Amplifier
  17. Borbely headphone amp
  18. Found An Amplifier In My Basement I'd Forgotten About & Learn It's Sought After
  19. Floating OPT oscilloscope measuraments
  20. I Wasn't Away That Long, What's WIth The Price Hikes On All My Old Toys?
  21. Channel voltage mismatch
  22. OS70/1750 datasheets
  23. Beautiful Chassis
  24. 6A4, 46 and 47...excellent sound tubes !!!!
  25. Is it Overkill to use Duelund Caps in Power Stage (Counterpoint SA-5.1)
  26. Quicksilver M135 Schematic?
  27. recognize this old amp?
  28. grey fogging inside 6sn7
  29. Point to point or pcb?
  30. Quad query
  31. Fixing a Velleman K4040 - Buzz HIss Crackle Blown Tubes
  32. Found Original Genalex 12AX7..Need Advice..
  33. OPT power rating and amplifier power
  34. 6BG6-GA
  35. EL84 driving EL84 SET with fixed bias
  36. P2P 6CG7 Input Buffer
  37. 865 in triode mode...anyone ever tried it?
  38. PP KT88 Amp Low frequency Ringing
  39. World audio designs kel34
  40. Glassware Audio Design
  41. 2A3 mounted horizontally
  42. from tube amp to fm reciever
  43. diy tube amp
  44. Cary 805ae xlr option
  45. ST-70 mono makeover
  46. breaking in audio capacitors
  47. Question about 6V6GT amp schematic
  48. Sherwood Schematic
  49. Ever hear of a D7L1 or D7L3 YR7 tube?
  50. Psvane Replica RCA 2A3 tube - WR2A3
  51. 845 Driver Circuit
  52. ADJUSTABLE BIAS MOD KIT
  53. Gold Lion B749 12au7 Thoughts?
  54. Siliconray SRK 09 tube amp kit help
  55. Quantum minstrel
  56. Does anyone know how John Lee Hooker recorded this? (1949)
  57. Please Identify these black capacitors.
  58. New Tubes too silent (6P15P)
  59. best sounding & value amp kits/designs?
  60. Custom Woodwork For Tube Amp
  61. Tube 2E22 in triode mode
  62. Has anyone built an OTL amp with switch mode power supplies.
  63. Altec 15067 transformers
  64. Some interesting findings with transformers
  65. Bogen KO-60 Output Iron
  66. What would you do with Scott 222D IRON?
  67. Aikido vs CCDA
  68. wiring color code
  69. Maverick Audio TubeMagic D1 DAC
  70. Is one gz34 enough
  71. Edcor OPT opinions
  72. mengyue mini/ming da el34b
  73. I need a tube buffer circuit using a 12au7
  74. Stereo Amplifier Wood Enclosure
  75. What is the theoretical advantage of direct heated triodes?
  76. 6AS6 is useful for audio ?
  77. GM-70 design approach
  78. Ultimate emotion core material ( types of silicon steel , Permalloy or Amorphous etc)
  79. Looking to build my first tube amplifier
  80. Tube/SS opamp
  81. Biasing 6CA7/EL34 in Luxman LX33
  82. John Broskie MIA again?
  83. combine filament winding for rectifier
  84. HYBRID TUBE CFP
  85. 9302 Maggie Rebuild
  86. Pyramid-IX monoblock, 200W from 4x GU-50
  87. Suggestions of phono stage to build
  88. Do power transformers affect sound quality?
  89. Help with a Velleman K4040 ...
  90. Capacitor replacement confusion
  91. RCA PA Amplifer, Input Transformers
  92. Channel imbalance Xiang Sheng DAC-01
  93. ARC M100s
  94. pros & cons of current mirror to balance a push-pull ?
  95. Wright Audio WLA10 help needed
  96. The Best tube/valve sound!?
  97. Mcintosh MC1000 and Ming Da MC300-PRE
  98. Operating Modern 845s
  99. The Transcendent Sound Son of Beast OTL Master/Mod Thread.
  100. Neutralizing An Amplifier
  101. Stacked speakers driven by an SEP amp?
  102. Tube buffer suggestion for LM4702 amplifier?
  103. FWB Voltage Doubler with -Bias supply
  104. 500V SE pentode design
  105. single ended transformer driving 32ohm speaker
  106. uC based Tube Curve Tracer Kit - Experts Opinion ?
  107. 250K Attenuator
  108. Possible to drive PP EL34-triodes with a cathodyne phase-splitter?
  109. Daughters POD amp 13EM7 Pics
  110. Calculating Ripple Current with PSUD2
  111. Channel problem on 45 converted amp
  112. Want to make a tube preamp
  113. Marantz TC-5 choke value
  114. diference between schematics and pcb layout
  115. Would this work?
  116. Can old resistors go bad?
  117. Strange output tube behaviour
  118. Practical question: toroidal transformer / heater current / kt120
  119. Morgan Jones Power supply cap values
  120. Can use a ballast for a PSU??
  121. Looking for a OTL tube headphone amp design
  122. Relative Humidity Attenuating HF
  123. Parallel Output transformer question
  124. Need help to ID a tube...
  125. Modifications to Sennheiser VKS 203
  126. Onix SP3 integrated amp latest schematic
  127. Omit sp3 integrated amp latest schematic
  128. Help: Western Electric 102A Tube Datasheet and Test Settings
  129. Power and output transformer separated from amplifier
  130. discrete and simple VCCS
  131. heater wiring question
  132. What is the deal with Welborne Labs?
  133. Center Channel
  134. input stage problem help please!
  135. Tube Tips/Tricks for beginners
  136. Any skilled custom tube amplifier builders out there?
  137. Are these tubes really matched?
  138. Single Ended Amp
  139. Mighty Midget Problems
  140. Run the tube stuff in your car
  141. Jackson 648 test for 6973
  142. Space-charge tetrodes in Inverted Mode
  143. choosing input valve
  144. Rectifier characteristics
  145. Glass-ware?
  146. 5751 Mil spec tubes vrs 12AX7
  147. 47 pentode...fabulous sound !!!!
  148. Aikido preamp transformer question
  149. 40's tube receiver question
  150. W5m transformer
  151. Dual voltage PS filtering.
  152. OD3 150V tube regulator
  153. Fisher 500c
  154. Help with quad cap upgrade
  155. low voltage hybrid power amplifier
  156. Morgan Jones Kapacitors
  157. Which IR LED?
  158. Tube Frequency Response
  159. Big B+ voltage drop using diode rectifier.
  160. Triode ST70 kit schematic?
  161. 6AU6 replacement
  162. IT in cathode for driver class A2 tube
  163. Bogen MX30 Output Transformers
  164. Worlds Most Expensive Tube Amp !!!
  165. Blown screen resistor
  166. Blown screen resistor
  167. To ground plane or not?
  168. 5Z4PA Alternative?
  169. Question about chassis ground
  170. 6337- wtf is it?
  171. need ideers for a 6 channel amp
  172. sv572 transformer headache
  173. 6C33C / 6EM7
  174. 6146 TUBES ?
  175. Impedance matching
  176. QRP03 - Tube Buffered Gainclone
  177. Amp Cage Fababricators?
  178. PP KT88, Need help!
  179. Question regarding rectifier tube replacement
  180. Harmon Kardon A500
  181. Double triode 6SN7
  182. Tank's DIY tube preamp
  183. C core OPT for PP EL84
  184. amp diagram for KT88 and 300B on the same circuit
  185. Yaqin MS 34 D
  186. Tube buffer for amplifier with LM1875
  187. What is the best ?
  188. Fender DRRI tone
  189. DUKANE tube PA help
  190. Old tube? HELP RSE NP-7V-12 168810
  191. My first tube power amp
  192. Another mystery tube:
  193. Quad 22 Wiring
  194. Radford phase splitter again
  195. hookup wire source
  196. MCU adjustable fixed bias
  197. vr tube / glow tube as filter?
  198. Using phono stage only of preamp
  199. Correct settings for EBL21 and other tube on Hickok 539C
  200. Decca Portable Record Player model DPS8 Filter cap replacment
  201. 6V6 vs EL84 for output
  202. Realistic HK 210/Acrosound Stereo 120 Amp Schmatic/Manual Needed
  203. 2A3 with 12AT7
  204. Voltage rating of plate gyrator MOSFET
  205. Quad22 like preamplifier kit
  206. Push-pull implemented with KT88
  207. My QUAD 2 Restoration
  208. DIY High Power Car Tube Amp
  209. Perished insulation on transformer secondary - seems shorted. What can I do here?
  210. Need advice and help with new build
  211. Suggestions for a cheap Stereo Phono tube preamp based upon this power transformer?
  212. Determining imput impedence of a preamp line stage
  213. Newb question on 12AU7 gain stage
  214. Valve Preamplifier Help
  215. OPT choices - 6L6 PPP
  216. MESA STRATEGY 400
  217. Shuguang, Beijing or Shanghai EL84 ?
  218. CJ PV-5 tubes
  219. Reference tube amp kit, <20 watts for under $1,000?
  220. ccs power supply 310a
  221. At what point does it become a "hybrid" ?
  222. Line filters
  223. Step-up MC transformer for Audio Research SP 6C
  224. Psud help.
  225. MC Step-Up OTL Stage (grounded-grid) for MM RIAA Head Amps
  226. Repurposing heathkit s-2 electronic switch
  227. output cap bypass?
  228. 6e5p & 6c41 tube amplifier
  229. Looking for my first tube amp...
  230. Acceptable variance in plate voltage?
  231. SRPP bias calculation
  232. 6A3 test, what am I doing wrong?
  233. Goldline Phono Tube Pre Amp PCB - Analog Metric
  234. New Copper Nanoparticle Solder - Breakthrough?
  235. SRPP as a final stage? What do you think?
  236. Troughline Transmissionline theory explanation needed
  237. Help with odd bias method on Crown tube amp
  238. preamp output impedance matching
  239. KT66 Woes
  240. Help with Calibration: Hickok Western Electric KS-15750-L1 Tubes Tester
  241. Cascode driver
  242. 2a3 DC coupled
  243. ECF/PCF 200, 201 B10B 10Pin Tubes
  244. Homemade EL84 Push-Pull amp doesn't work
  245. Tamradio Transformer
  246. Variable HF oscilator
  247. eico st70 dimming house lights and slowing turntable`
  248. Amplifier Calculators
  249. Are any of these tubes useful for audio
  250. Modifying a J Sound Lab 2A3 amplifier

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