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  1. What is the theoretical advantage of direct heated triodes?
  2. 6AS6 is useful for audio ?
  3. GM-70 design approach
  4. Ultimate emotion core material ( types of silicon steel , Permalloy or Amorphous etc)
  5. Looking to build my first tube amplifier
  6. Tube/SS opamp
  7. Biasing 6CA7/EL34 in Luxman LX33
  8. John Broskie MIA again?
  9. combine filament winding for rectifier
  10. HYBRID TUBE CFP
  11. 9302 Maggie Rebuild
  12. Pyramid-IX monoblock, 200W from 4x GU-50
  13. Suggestions of phono stage to build
  14. Do power transformers affect sound quality?
  15. Help with a Velleman K4040 ...
  16. Capacitor replacement confusion
  17. RCA PA Amplifer, Input Transformers
  18. Channel imbalance Xiang Sheng DAC-01
  19. ARC M100s
  20. pros & cons of current mirror to balance a push-pull ?
  21. Wright Audio WLA10 help needed
  22. The Best tube/valve sound!?
  23. Mcintosh MC1000 and Ming Da MC300-PRE
  24. Operating Modern 845s
  25. The Transcendent Sound Son of Beast OTL Master/Mod Thread.
  26. Neutralizing An Amplifier
  27. Stacked speakers driven by an SEP amp?
  28. Tube buffer suggestion for LM4702 amplifier?
  29. FWB Voltage Doubler with -Bias supply
  30. 500V SE pentode design
  31. single ended transformer driving 32ohm speaker
  32. uC based Tube Curve Tracer Kit - Experts Opinion ?
  33. 250K Attenuator
  34. Possible to drive PP EL34-triodes with a cathodyne phase-splitter?
  35. Daughters POD amp 13EM7 Pics
  36. Calculating Ripple Current with PSUD2
  37. Channel problem on 45 converted amp
  38. Want to make a tube preamp
  39. Marantz TC-5 choke value
  40. diference between schematics and pcb layout
  41. Would this work?
  42. Can old resistors go bad?
  43. Strange output tube behaviour
  44. Practical question: toroidal transformer / heater current / kt120
  45. Morgan Jones Power supply cap values
  46. Can use a ballast for a PSU??
  47. Looking for a OTL tube headphone amp design
  48. Relative Humidity Attenuating HF
  49. Parallel Output transformer question
  50. Need help to ID a tube...
  51. Modifications to Sennheiser VKS 203
  52. Onix SP3 integrated amp latest schematic
  53. Omit sp3 integrated amp latest schematic
  54. Help: Western Electric 102A Tube Datasheet and Test Settings
  55. Power and output transformer separated from amplifier
  56. discrete and simple VCCS
  57. heater wiring question
  58. What is the deal with Welborne Labs?
  59. Center Channel
  60. input stage problem help please!
  61. Tube Tips/Tricks for beginners
  62. Any skilled custom tube amplifier builders out there?
  63. Are these tubes really matched?
  64. Single Ended Amp
  65. Mighty Midget Problems
  66. Run the tube stuff in your car
  67. Jackson 648 test for 6973
  68. Space-charge tetrodes in Inverted Mode
  69. choosing input valve
  70. Rectifier characteristics
  71. Glass-ware?
  72. 5751 Mil spec tubes vrs 12AX7
  73. 47 pentode...fabulous sound !!!!
  74. Aikido preamp transformer question
  75. 40's tube receiver question
  76. W5m transformer
  77. Dual voltage PS filtering.
  78. OD3 150V tube regulator
  79. Fisher 500c
  80. Help with quad cap upgrade
  81. low voltage hybrid power amplifier
  82. Morgan Jones Kapacitors
  83. Which IR LED?
  84. Tube Frequency Response
  85. Big B+ voltage drop using diode rectifier.
  86. Triode ST70 kit schematic?
  87. 6AU6 replacement
  88. IT in cathode for driver class A2 tube
  89. Bogen MX30 Output Transformers
  90. Worlds Most Expensive Tube Amp !!!
  91. Blown screen resistor
  92. Blown screen resistor
  93. To ground plane or not?
  94. 5Z4PA Alternative?
  95. Question about chassis ground
  96. 6337- wtf is it?
  97. need ideers for a 6 channel amp
  98. sv572 transformer headache
  99. 6C33C / 6EM7
  100. 6146 TUBES ?
  101. Impedance matching
  102. QRP03 - Tube Buffered Gainclone
  103. Amp Cage Fababricators?
  104. PP KT88, Need help!
  105. Question regarding rectifier tube replacement
  106. Harmon Kardon A500
  107. Double triode 6SN7
  108. Tank's DIY tube preamp
  109. C core OPT for PP EL84
  110. amp diagram for KT88 and 300B on the same circuit
  111. Yaqin MS 34 D
  112. Tube buffer for amplifier with LM1875
  113. What is the best ?
  114. Fender DRRI tone
  115. DUKANE tube PA help
  116. Old tube? HELP RSE NP-7V-12 168810
  117. My first tube power amp
  118. Another mystery tube:
  119. Quad 22 Wiring
  120. Radford phase splitter again
  121. hookup wire source
  122. MCU adjustable fixed bias
  123. vr tube / glow tube as filter?
  124. Using phono stage only of preamp
  125. Correct settings for EBL21 and other tube on Hickok 539C
  126. Decca Portable Record Player model DPS8 Filter cap replacment
  127. 6V6 vs EL84 for output
  128. Realistic HK 210/Acrosound Stereo 120 Amp Schmatic/Manual Needed
  129. 2A3 with 12AT7
  130. Voltage rating of plate gyrator MOSFET
  131. Quad22 like preamplifier kit
  132. Push-pull implemented with KT88
  133. My QUAD 2 Restoration
  134. DIY High Power Car Tube Amp
  135. Perished insulation on transformer secondary - seems shorted. What can I do here?
  136. Need advice and help with new build
  137. Suggestions for a cheap Stereo Phono tube preamp based upon this power transformer?
  138. Determining imput impedence of a preamp line stage
  139. Newb question on 12AU7 gain stage
  140. Valve Preamplifier Help
  141. OPT choices - 6L6 PPP
  142. MESA STRATEGY 400
  143. Shuguang, Beijing or Shanghai EL84 ?
  144. CJ PV-5 tubes
  145. Reference tube amp kit, <20 watts for under $1,000?
  146. ccs power supply 310a
  147. At what point does it become a "hybrid" ?
  148. Line filters
  149. Step-up MC transformer for Audio Research SP 6C
  150. Psud help.
  151. MC Step-Up OTL Stage (grounded-grid) for MM RIAA Head Amps
  152. Repurposing heathkit s-2 electronic switch
  153. output cap bypass?
  154. 6e5p & 6c41 tube amplifier
  155. Looking for my first tube amp...
  156. Acceptable variance in plate voltage?
  157. SRPP bias calculation
  158. 6A3 test, what am I doing wrong?
  159. Goldline Phono Tube Pre Amp PCB - Analog Metric
  160. New Copper Nanoparticle Solder - Breakthrough?
  161. SRPP as a final stage? What do you think?
  162. Troughline Transmissionline theory explanation needed
  163. Help with odd bias method on Crown tube amp
  164. preamp output impedance matching
  165. KT66 Woes
  166. Help with Calibration: Hickok Western Electric KS-15750-L1 Tubes Tester
  167. Cascode driver
  168. 2a3 DC coupled
  169. ECF/PCF 200, 201 B10B 10Pin Tubes
  170. Homemade EL84 Push-Pull amp doesn't work
  171. Tamradio Transformer
  172. Variable HF oscilator
  173. eico st70 dimming house lights and slowing turntable`
  174. Amplifier Calculators
  175. Are any of these tubes useful for audio
  176. Modifying a J Sound Lab 2A3 amplifier
  177. Experimentation - Power transformer as output
  178. Mullard with ECC99 Phase Splitter
  179. Killed an Edcor OPT. How?
  180. Silvertone 1482 Fuse Troubleshooter help
  181. If it ain't broke....
  182. Silly DHT question VaMax
  183. Recommendations for preamps with PCC88
  184. 6h23n same as 6n23p
  185. Mighty Midget Amplifier and speaker requirements.
  186. Bias Supply protection
  187. Tube Amp Schematics
  188. POWER TRANSFORMER IDENTIFICATION NEEDED "26R90"
  189. 6sn7 driving Push Pull Parallel kt88's?
  190. help with an old Peak ST-100 - single ended 6GW8
  191. Designing an 801 SET Class A2 Amp
  192. Grid choke considerations for 300b
  193. SE poweramp with best bass performance
  194. 45 Tube IN SET Amp
  195. what will happen?
  196. ECL86 PP Amp - Very low frequency clicking
  197. motor run cap question
  198. Power Switch/Indicator Lamp Mod to S-5 Electronics K-501
  199. EL34 SET With No Driver Tube?
  200. Filter capacitors - motor run?
  201. Microwave transformers
  202. Capacitors in the cathode of preamp tubes
  203. How Many Tubes to a Rackspace?
  204. selenium diodes
  205. Is it possible to Oversize an SE OPT?
  206. questions about my ecc83 phono pre build
  207. PSU resistor temperature
  208. QE08-200
  209. Adding heater transformer to my 6b4g amp. help a noob please.
  210. Bogen CHB-35a Troubleshooting: Distortion, Power Tubes Very Hot
  211. Big Cap in luxman MB3045
  212. Question about 4x12 cabinet wiring
  213. What happened to Sakuma-san's website ?
  214. Should I ???
  215. Can you classify condition of tubes?
  216. Help: Hickok Western Electric KS-15750-L1 Tubes Tester Maintenance and Calibration
  217. ecc99 preamp into an amp
  218. AI 500 Volume pot advice wanted.
  219. eico st70 input impedance question
  220. Tube Preamp or Power Amp?
  221. pmillett "Engineer's Amplifier" to mono?
  222. Advice/schematics wanted for HF-81 opt project
  223. 7591 tube, can't find that number on tester.
  224. valve upgrade
  225. has anyone known about Ming Da amplifiers
  226. A nice little valve amplifier
  227. Use rectifier winding for 6.3V DC heater?
  228. Voltage Regulators Zener / Gas Reg
  229. Looking for first tube amp kit.
  230. Which choke is better ?
  231. UK input voltage question
  232. 1sh29b
  233. 6G2 amp - volume and tone play up on one input only
  234. One channel grainy sound
  235. anybody know 6BY5 plate resistance ?
  236. SE 6550
  237. Yaqin MC-100b Volume pot
  238. Pair of possible MC step ups - octal mount
  239. My Mighty Midget
  240. Conrad Johnson MV75 "update circuit drawing"
  241. Cheap Red LED bias on ecc83/12ax7
  242. stoneAmp
  243. Project thread: KT88 PP amp
  244. I need the voltages or schematic for a Magnavox 177.55 amp
  245. Different PSE output designs - which to use?
  246. Toroidal (adding a winding)
  247. Kondo Souga - audition
  248. Electrocube Polyestyrene caps
  249. a incar tube/valve line driver
  250. Before I punch the holes.. A quartet of EL84?

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