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  1. Driving 211 with VT25 or EL34?
  2. DIY AMP start project - Help choosing one
  3. Pilot 248B Amp with weak channel
  4. 6H30 VA stage?
  5. What is the best way to connect DC filaments?
  6. suggestions for a parallel feed 45 amp?
  7. Counterpoint SA 5.1 repairs
  8. The Morgan Jones mini tube headphone Amplifier
  9. Borbely headphone amp
  10. Found An Amplifier In My Basement I'd Forgotten About & Learn It's Sought After
  11. Floating OPT oscilloscope measuraments
  12. I Wasn't Away That Long, What's WIth The Price Hikes On All My Old Toys?
  13. Channel voltage mismatch
  14. OS70/1750 datasheets
  15. Beautiful Chassis
  16. 6A4, 46 and 47...excellent sound tubes !!!!
  17. Is it Overkill to use Duelund Caps in Power Stage (Counterpoint SA-5.1)
  18. Quicksilver M135 Schematic?
  19. recognize this old amp?
  20. grey fogging inside 6sn7
  21. Point to point or pcb?
  22. Quad query
  23. Fixing a Velleman K4040 - Buzz HIss Crackle Blown Tubes
  24. Found Original Genalex 12AX7..Need Advice..
  25. OPT power rating and amplifier power
  26. 6BG6-GA
  27. EL84 driving EL84 SET with fixed bias
  28. P2P 6CG7 Input Buffer
  29. 865 in triode mode...anyone ever tried it?
  30. PP KT88 Amp Low frequency Ringing
  31. World audio designs kel34
  32. Glassware Audio Design
  33. 2A3 mounted horizontally
  34. from tube amp to fm reciever
  35. diy tube amp
  36. Cary 805ae xlr option
  37. ST-70 mono makeover
  38. breaking in audio capacitors
  39. Question about 6V6GT amp schematic
  40. Sherwood Schematic
  41. Ever hear of a D7L1 or D7L3 YR7 tube?
  42. Psvane Replica RCA 2A3 tube - WR2A3
  43. 845 Driver Circuit
  44. ADJUSTABLE BIAS MOD KIT
  45. Gold Lion B749 12au7 Thoughts?
  46. Siliconray SRK 09 tube amp kit help
  47. Quantum minstrel
  48. Does anyone know how John Lee Hooker recorded this? (1949)
  49. Please Identify these black capacitors.
  50. New Tubes too silent (6P15P)
  51. best sounding & value amp kits/designs?
  52. Custom Woodwork For Tube Amp
  53. Tube 2E22 in triode mode
  54. Has anyone built an OTL amp with switch mode power supplies.
  55. Altec 15067 transformers
  56. Some interesting findings with transformers
  57. Bogen KO-60 Output Iron
  58. What would you do with Scott 222D IRON?
  59. Aikido vs CCDA
  60. wiring color code
  61. Maverick Audio TubeMagic D1 DAC
  62. Is one gz34 enough
  63. Edcor OPT opinions
  64. mengyue mini/ming da el34b
  65. I need a tube buffer circuit using a 12au7
  66. Stereo Amplifier Wood Enclosure
  67. What is the theoretical advantage of direct heated triodes?
  68. 6AS6 is useful for audio ?
  69. GM-70 design approach
  70. Ultimate emotion core material ( types of silicon steel , Permalloy or Amorphous etc)
  71. Looking to build my first tube amplifier
  72. Tube/SS opamp
  73. Biasing 6CA7/EL34 in Luxman LX33
  74. John Broskie MIA again?
  75. combine filament winding for rectifier
  76. HYBRID TUBE CFP
  77. 9302 Maggie Rebuild
  78. Pyramid-IX monoblock, 200W from 4x GU-50
  79. Suggestions of phono stage to build
  80. Do power transformers affect sound quality?
  81. Help with a Velleman K4040 ...
  82. Capacitor replacement confusion
  83. RCA PA Amplifer, Input Transformers
  84. Channel imbalance Xiang Sheng DAC-01
  85. ARC M100s
  86. pros & cons of current mirror to balance a push-pull ?
  87. Wright Audio WLA10 help needed
  88. The Best tube/valve sound!?
  89. Mcintosh MC1000 and Ming Da MC300-PRE
  90. Operating Modern 845s
  91. The Transcendent Sound Son of Beast OTL Master/Mod Thread.
  92. Neutralizing An Amplifier
  93. Stacked speakers driven by an SEP amp?
  94. Tube buffer suggestion for LM4702 amplifier?
  95. FWB Voltage Doubler with -Bias supply
  96. 500V SE pentode design
  97. single ended transformer driving 32ohm speaker
  98. uC based Tube Curve Tracer Kit - Experts Opinion ?
  99. 250K Attenuator
  100. Possible to drive PP EL34-triodes with a cathodyne phase-splitter?
  101. Daughters POD amp 13EM7 Pics
  102. Calculating Ripple Current with PSUD2
  103. Channel problem on 45 converted amp
  104. Want to make a tube preamp
  105. Marantz TC-5 choke value
  106. diference between schematics and pcb layout
  107. Would this work?
  108. Can old resistors go bad?
  109. Strange output tube behaviour
  110. Practical question: toroidal transformer / heater current / kt120
  111. Morgan Jones Power supply cap values
  112. Can use a ballast for a PSU??
  113. Looking for a OTL tube headphone amp design
  114. Relative Humidity Attenuating HF
  115. Parallel Output transformer question
  116. Need help to ID a tube...
  117. Modifications to Sennheiser VKS 203
  118. Onix SP3 integrated amp latest schematic
  119. Omit sp3 integrated amp latest schematic
  120. Help: Western Electric 102A Tube Datasheet and Test Settings
  121. Power and output transformer separated from amplifier
  122. discrete and simple VCCS
  123. heater wiring question
  124. What is the deal with Welborne Labs?
  125. Center Channel
  126. input stage problem help please!
  127. Tube Tips/Tricks for beginners
  128. Any skilled custom tube amplifier builders out there?
  129. Are these tubes really matched?
  130. Single Ended Amp
  131. Mighty Midget Problems
  132. Run the tube stuff in your car
  133. Jackson 648 test for 6973
  134. Space-charge tetrodes in Inverted Mode
  135. choosing input valve
  136. Rectifier characteristics
  137. Glass-ware?
  138. 5751 Mil spec tubes vrs 12AX7
  139. 47 pentode...fabulous sound !!!!
  140. Aikido preamp transformer question
  141. 40's tube receiver question
  142. W5m transformer
  143. Dual voltage PS filtering.
  144. OD3 150V tube regulator
  145. Fisher 500c
  146. Help with quad cap upgrade
  147. low voltage hybrid power amplifier
  148. Morgan Jones Kapacitors
  149. Which IR LED?
  150. Tube Frequency Response
  151. Big B+ voltage drop using diode rectifier.
  152. Triode ST70 kit schematic?
  153. 6AU6 replacement
  154. IT in cathode for driver class A2 tube
  155. Bogen MX30 Output Transformers
  156. Worlds Most Expensive Tube Amp !!!
  157. Blown screen resistor
  158. Blown screen resistor
  159. To ground plane or not?
  160. 5Z4PA Alternative?
  161. Question about chassis ground
  162. 6337- wtf is it?
  163. need ideers for a 6 channel amp
  164. sv572 transformer headache
  165. 6C33C / 6EM7
  166. 6146 TUBES ?
  167. Impedance matching
  168. QRP03 - Tube Buffered Gainclone
  169. Amp Cage Fababricators?
  170. PP KT88, Need help!
  171. Question regarding rectifier tube replacement
  172. Harmon Kardon A500
  173. Double triode 6SN7
  174. Tank's DIY tube preamp
  175. C core OPT for PP EL84
  176. amp diagram for KT88 and 300B on the same circuit
  177. Yaqin MS 34 D
  178. Tube buffer for amplifier with LM1875
  179. What is the best ?
  180. Fender DRRI tone
  181. DUKANE tube PA help
  182. Old tube? HELP RSE NP-7V-12 168810
  183. My first tube power amp
  184. Another mystery tube:
  185. Quad 22 Wiring
  186. Radford phase splitter again
  187. hookup wire source
  188. MCU adjustable fixed bias
  189. vr tube / glow tube as filter?
  190. Using phono stage only of preamp
  191. Correct settings for EBL21 and other tube on Hickok 539C
  192. Decca Portable Record Player model DPS8 Filter cap replacment
  193. 6V6 vs EL84 for output
  194. Realistic HK 210/Acrosound Stereo 120 Amp Schmatic/Manual Needed
  195. 2A3 with 12AT7
  196. Voltage rating of plate gyrator MOSFET
  197. Quad22 like preamplifier kit
  198. Push-pull implemented with KT88
  199. My QUAD 2 Restoration
  200. DIY High Power Car Tube Amp
  201. Perished insulation on transformer secondary - seems shorted. What can I do here?
  202. Need advice and help with new build
  203. Suggestions for a cheap Stereo Phono tube preamp based upon this power transformer?
  204. Determining imput impedence of a preamp line stage
  205. Newb question on 12AU7 gain stage
  206. Valve Preamplifier Help
  207. OPT choices - 6L6 PPP
  208. MESA STRATEGY 400
  209. Shuguang, Beijing or Shanghai EL84 ?
  210. CJ PV-5 tubes
  211. Reference tube amp kit, <20 watts for under $1,000?
  212. ccs power supply 310a
  213. At what point does it become a "hybrid" ?
  214. Line filters
  215. Step-up MC transformer for Audio Research SP 6C
  216. Psud help.
  217. MC Step-Up OTL Stage (grounded-grid) for MM RIAA Head Amps
  218. Repurposing heathkit s-2 electronic switch
  219. output cap bypass?
  220. 6e5p & 6c41 tube amplifier
  221. Looking for my first tube amp...
  222. Acceptable variance in plate voltage?
  223. SRPP bias calculation
  224. 6A3 test, what am I doing wrong?
  225. Goldline Phono Tube Pre Amp PCB - Analog Metric
  226. New Copper Nanoparticle Solder - Breakthrough?
  227. SRPP as a final stage? What do you think?
  228. Troughline Transmissionline theory explanation needed
  229. Help with odd bias method on Crown tube amp
  230. preamp output impedance matching
  231. KT66 Woes
  232. Help with Calibration: Hickok Western Electric KS-15750-L1 Tubes Tester
  233. Cascode driver
  234. 2a3 DC coupled
  235. ECF/PCF 200, 201 B10B 10Pin Tubes
  236. Homemade EL84 Push-Pull amp doesn't work
  237. Tamradio Transformer
  238. Variable HF oscilator
  239. eico st70 dimming house lights and slowing turntable`
  240. Amplifier Calculators
  241. Are any of these tubes useful for audio
  242. Modifying a J Sound Lab 2A3 amplifier
  243. Experimentation - Power transformer as output
  244. Mullard with ECC99 Phase Splitter
  245. Killed an Edcor OPT. How?
  246. Silvertone 1482 Fuse Troubleshooter help
  247. If it ain't broke....
  248. Silly DHT question VaMax
  249. Recommendations for preamps with PCC88
  250. 6h23n same as 6n23p

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