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  1. ST-70 mono makeover
  2. breaking in audio capacitors
  3. Question about 6V6GT amp schematic
  4. Sherwood Schematic
  5. Ever hear of a D7L1 or D7L3 YR7 tube?
  6. Psvane Replica RCA 2A3 tube - WR2A3
  7. 845 Driver Circuit
  8. ADJUSTABLE BIAS MOD KIT
  9. Gold Lion B749 12au7 Thoughts?
  10. Siliconray SRK 09 tube amp kit help
  11. Quantum minstrel
  12. Does anyone know how John Lee Hooker recorded this? (1949)
  13. Please Identify these black capacitors.
  14. New Tubes too silent (6P15P)
  15. best sounding & value amp kits/designs?
  16. Custom Woodwork For Tube Amp
  17. Tube 2E22 in triode mode
  18. Has anyone built an OTL amp with switch mode power supplies.
  19. Altec 15067 transformers
  20. Some interesting findings with transformers
  21. Bogen KO-60 Output Iron
  22. What would you do with Scott 222D IRON?
  23. Aikido vs CCDA
  24. wiring color code
  25. Maverick Audio TubeMagic D1 DAC
  26. Is one gz34 enough
  27. Edcor OPT opinions
  28. mengyue mini/ming da el34b
  29. I need a tube buffer circuit using a 12au7
  30. Stereo Amplifier Wood Enclosure
  31. What is the theoretical advantage of direct heated triodes?
  32. 6AS6 is useful for audio ?
  33. GM-70 design approach
  34. Ultimate emotion core material ( types of silicon steel , Permalloy or Amorphous etc)
  35. Looking to build my first tube amplifier
  36. Tube/SS opamp
  37. Biasing 6CA7/EL34 in Luxman LX33
  38. John Broskie MIA again?
  39. combine filament winding for rectifier
  40. HYBRID TUBE CFP
  41. 9302 Maggie Rebuild
  42. Pyramid-IX monoblock, 200W from 4x GU-50
  43. Suggestions of phono stage to build
  44. Do power transformers affect sound quality?
  45. Help with a Velleman K4040 ...
  46. Capacitor replacement confusion
  47. RCA PA Amplifer, Input Transformers
  48. Channel imbalance Xiang Sheng DAC-01
  49. ARC M100s
  50. pros & cons of current mirror to balance a push-pull ?
  51. Wright Audio WLA10 help needed
  52. The Best tube/valve sound!?
  53. Mcintosh MC1000 and Ming Da MC300-PRE
  54. Operating Modern 845s
  55. The Transcendent Sound Son of Beast OTL Master/Mod Thread.
  56. Neutralizing An Amplifier
  57. Stacked speakers driven by an SEP amp?
  58. Tube buffer suggestion for LM4702 amplifier?
  59. FWB Voltage Doubler with -Bias supply
  60. 500V SE pentode design
  61. single ended transformer driving 32ohm speaker
  62. uC based Tube Curve Tracer Kit - Experts Opinion ?
  63. 250K Attenuator
  64. Possible to drive PP EL34-triodes with a cathodyne phase-splitter?
  65. Daughters POD amp 13EM7 Pics
  66. Calculating Ripple Current with PSUD2
  67. Channel problem on 45 converted amp
  68. Want to make a tube preamp
  69. Marantz TC-5 choke value
  70. diference between schematics and pcb layout
  71. Would this work?
  72. Can old resistors go bad?
  73. Strange output tube behaviour
  74. Practical question: toroidal transformer / heater current / kt120
  75. Morgan Jones Power supply cap values
  76. Can use a ballast for a PSU??
  77. Looking for a OTL tube headphone amp design
  78. Relative Humidity Attenuating HF
  79. Parallel Output transformer question
  80. Need help to ID a tube...
  81. Modifications to Sennheiser VKS 203
  82. Onix SP3 integrated amp latest schematic
  83. Omit sp3 integrated amp latest schematic
  84. Help: Western Electric 102A Tube Datasheet and Test Settings
  85. Power and output transformer separated from amplifier
  86. discrete and simple VCCS
  87. heater wiring question
  88. What is the deal with Welborne Labs?
  89. Center Channel
  90. input stage problem help please!
  91. Tube Tips/Tricks for beginners
  92. Any skilled custom tube amplifier builders out there?
  93. Are these tubes really matched?
  94. Single Ended Amp
  95. Mighty Midget Problems
  96. Run the tube stuff in your car
  97. Jackson 648 test for 6973
  98. Space-charge tetrodes in Inverted Mode
  99. choosing input valve
  100. Rectifier characteristics
  101. Glass-ware?
  102. 5751 Mil spec tubes vrs 12AX7
  103. 47 pentode...fabulous sound !!!!
  104. Aikido preamp transformer question
  105. 40's tube receiver question
  106. W5m transformer
  107. Dual voltage PS filtering.
  108. OD3 150V tube regulator
  109. Fisher 500c
  110. Help with quad cap upgrade
  111. low voltage hybrid power amplifier
  112. Morgan Jones Kapacitors
  113. Which IR LED?
  114. Tube Frequency Response
  115. Big B+ voltage drop using diode rectifier.
  116. Triode ST70 kit schematic?
  117. 6AU6 replacement
  118. IT in cathode for driver class A2 tube
  119. Bogen MX30 Output Transformers
  120. Worlds Most Expensive Tube Amp !!!
  121. Blown screen resistor
  122. Blown screen resistor
  123. To ground plane or not?
  124. 5Z4PA Alternative?
  125. Question about chassis ground
  126. 6337- wtf is it?
  127. need ideers for a 6 channel amp
  128. sv572 transformer headache
  129. 6C33C / 6EM7
  130. 6146 TUBES ?
  131. Impedance matching
  132. QRP03 - Tube Buffered Gainclone
  133. Amp Cage Fababricators?
  134. PP KT88, Need help!
  135. Question regarding rectifier tube replacement
  136. Harmon Kardon A500
  137. Double triode 6SN7
  138. Tank's DIY tube preamp
  139. C core OPT for PP EL84
  140. amp diagram for KT88 and 300B on the same circuit
  141. Yaqin MS 34 D
  142. Tube buffer for amplifier with LM1875
  143. What is the best ?
  144. Fender DRRI tone
  145. DUKANE tube PA help
  146. Old tube? HELP RSE NP-7V-12 168810
  147. My first tube power amp
  148. Another mystery tube:
  149. Quad 22 Wiring
  150. Radford phase splitter again
  151. hookup wire source
  152. MCU adjustable fixed bias
  153. vr tube / glow tube as filter?
  154. Using phono stage only of preamp
  155. Correct settings for EBL21 and other tube on Hickok 539C
  156. Decca Portable Record Player model DPS8 Filter cap replacment
  157. 6V6 vs EL84 for output
  158. Realistic HK 210/Acrosound Stereo 120 Amp Schmatic/Manual Needed
  159. 2A3 with 12AT7
  160. Voltage rating of plate gyrator MOSFET
  161. Quad22 like preamplifier kit
  162. Push-pull implemented with KT88
  163. My QUAD 2 Restoration
  164. DIY High Power Car Tube Amp
  165. Perished insulation on transformer secondary - seems shorted. What can I do here?
  166. Need advice and help with new build
  167. Suggestions for a cheap Stereo Phono tube preamp based upon this power transformer?
  168. Determining imput impedence of a preamp line stage
  169. Newb question on 12AU7 gain stage
  170. Valve Preamplifier Help
  171. OPT choices - 6L6 PPP
  172. MESA STRATEGY 400
  173. Shuguang, Beijing or Shanghai EL84 ?
  174. CJ PV-5 tubes
  175. Reference tube amp kit, <20 watts for under $1,000?
  176. ccs power supply 310a
  177. At what point does it become a "hybrid" ?
  178. Line filters
  179. Step-up MC transformer for Audio Research SP 6C
  180. Psud help.
  181. MC Step-Up OTL Stage (grounded-grid) for MM RIAA Head Amps
  182. Repurposing heathkit s-2 electronic switch
  183. output cap bypass?
  184. 6e5p & 6c41 tube amplifier
  185. Looking for my first tube amp...
  186. Acceptable variance in plate voltage?
  187. SRPP bias calculation
  188. 6A3 test, what am I doing wrong?
  189. Goldline Phono Tube Pre Amp PCB - Analog Metric
  190. New Copper Nanoparticle Solder - Breakthrough?
  191. SRPP as a final stage? What do you think?
  192. Troughline Transmissionline theory explanation needed
  193. Help with odd bias method on Crown tube amp
  194. preamp output impedance matching
  195. KT66 Woes
  196. Help with Calibration: Hickok Western Electric KS-15750-L1 Tubes Tester
  197. Cascode driver
  198. 2a3 DC coupled
  199. ECF/PCF 200, 201 B10B 10Pin Tubes
  200. Homemade EL84 Push-Pull amp doesn't work
  201. Tamradio Transformer
  202. Variable HF oscilator
  203. eico st70 dimming house lights and slowing turntable`
  204. Amplifier Calculators
  205. Are any of these tubes useful for audio
  206. Modifying a J Sound Lab 2A3 amplifier
  207. Experimentation - Power transformer as output
  208. Mullard with ECC99 Phase Splitter
  209. Killed an Edcor OPT. How?
  210. Silvertone 1482 Fuse Troubleshooter help
  211. If it ain't broke....
  212. Silly DHT question VaMax
  213. Recommendations for preamps with PCC88
  214. 6h23n same as 6n23p
  215. Mighty Midget Amplifier and speaker requirements.
  216. Bias Supply protection
  217. Tube Amp Schematics
  218. POWER TRANSFORMER IDENTIFICATION NEEDED "26R90"
  219. 6sn7 driving Push Pull Parallel kt88's?
  220. help with an old Peak ST-100 - single ended 6GW8
  221. Designing an 801 SET Class A2 Amp
  222. Grid choke considerations for 300b
  223. SE poweramp with best bass performance
  224. 45 Tube IN SET Amp
  225. what will happen?
  226. ECL86 PP Amp - Very low frequency clicking
  227. motor run cap question
  228. Power Switch/Indicator Lamp Mod to S-5 Electronics K-501
  229. EL34 SET With No Driver Tube?
  230. Filter capacitors - motor run?
  231. Microwave transformers
  232. Capacitors in the cathode of preamp tubes
  233. How Many Tubes to a Rackspace?
  234. selenium diodes
  235. Is it possible to Oversize an SE OPT?
  236. questions about my ecc83 phono pre build
  237. PSU resistor temperature
  238. QE08-200
  239. Adding heater transformer to my 6b4g amp. help a noob please.
  240. Bogen CHB-35a Troubleshooting: Distortion, Power Tubes Very Hot
  241. Big Cap in luxman MB3045
  242. Question about 4x12 cabinet wiring
  243. What happened to Sakuma-san's website ?
  244. Should I ???
  245. Can you classify condition of tubes?
  246. Help: Hickok Western Electric KS-15750-L1 Tubes Tester Maintenance and Calibration
  247. ecc99 preamp into an amp
  248. AI 500 Volume pot advice wanted.
  249. eico st70 input impedance question
  250. Tube Preamp or Power Amp?

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