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  1. purpose and value importance of resistor
  2. Values for Vintage Amp's & Preamp's Paragon 12(70's) & More
  3. Help with amp please.
  4. Another Discrete Current Source
  5. 834 Triode amp
  6. Determing the reason for mystery? cap in schematic.
  7. Dyna ST70 to Dual-differential EL34 triode amp project
  8. Tube Signal to Noise Ratio / Dynamic Range
  9. fluctating bias
  10. Just tried a Wire Wound pot for volume.
  11. LED's in the cathode..
  12. Dr. Arthur Loesch
  13. Counterpoint SA-220 mods
  14. Broskie P-P Bridged Output Stage
  15. Would a member fluent in technical German please have a look at this link?
  16. Damaged tube? EL84
  17. Heathkit AA-161 EL84/6BQ5 PP mono integrated amp mod
  18. vk-2100 mod question please
  19. Heater supply
  20. 6111/6n16b - linestage noise problem
  21. OPT specs
  22. Re: Tube Line gain stage with pcc88 or ecc82
  23. Knight-kit KA-55
  24. Can I delay part of a B supply this way?
  25. Tube Preamp turn on circuit
  26. SE GM-70 for 700-800 euro?
  27. filter cap markings
  28. tube buffer noise cancellation
  29. PSUD 2
  30. Bypassing filter caps with Smaller caps
  31. balancing resister for series capacitor in a power supply
  32. Yaqin MC-100b- TJ Full Music 6sn7
  33. Forgive me for I have sinned. Help with Volume Pot!
  34. Help with diagnoses for leak 20 PLEASE
  35. Suggested Circuit Changes to use EM80 in place of 6E2 Eye
  36. Fred Nachbaur SET amp: input capacitor
  37. Heathkit scu 1 and knight kn924 needed schematics
  38. Journey to the centre of a tube..
  39. RIP Dr Jim Marshall
  40. some questions about an ECL82 SE amp
  41. Heathkit Sine/Square wave Generator Manual needed!
  42. SRPP Signal Output Capacitors
  43. simple se input impedance
  44. Kt120 screen current
  45. New or used output xformers to play around with?
  46. Magnavox amp
  47. Help hooking up panel ammeter for bias adjust
  48. opt A-440
  49. OTL Headphone amplifier with Tube ED8000
  50. NJ7P Gone?
  51. MYSTERY METAL TUBES B-1532
  52. noisy tubes
  53. Old amp hum repair
  54. Traveling with DIY Kit in USA-Airport Security Question
  55. Hammond 1650P vs 1650N For EL34 PP
  56. Calibrate a Hickok 6000?
  57. Blown Output Tubes
  58. Kriesler Radiogram refurbishment questions
  59. 6P15P socket connection
  60. Revision 2. Balanced
  61. 6V6 schematic
  62. 6h23N test setting?
  63. 12AH7GT
  64. TUBE Tape Head record / playback amp....
  65. Strange couple comportament 6L6GC RCA black plates.
  66. Reduce Output Volume
  67. Differential Amp CCS Tail SVCS Plate - Noise Issues
  68. Triode curves for EL/PL519
  69. Is that a SRPP circuit with 6SN7?
  70. KT33 Push Pull
  71. Rogers Cadet III Integrated Amp Capacitor Values help
  72. 2a3 alternative after NOS burning
  73. 6SN7 SRPP - oscillating dc offset
  74. Hickok TV-2 'percent quality'
  75. Another Tube I/V converter/preamp for balanced DACs with SE output:build thread
  76. Aikido LV 48V ECC99 or 6N6p
  77. Project: Ultra Small 6C33 / Hybrid Stereo Headphone Amplifier
  78. Back to the tubes
  79. Any use for these PAECO transformer?
  80. Video lectures on tube amplifier design
  81. Millett PP or Allen Wright's PP-2c or?
  82. Magnavox 8608-10
  83. Time relay
  84. Help with Music Angel XD800MKIII mods!?
  85. Little Dot MKIII ??????
  86. Cathode follower wideband amplifier
  87. Wrong base ???
  88. My first DIY schematic... need eagle eyes.!
  89. Stubborn Noise/Oscillation - Another Call for Help
  90. help with power tranny
  91. Tube Amp Repair - SE Michigan
  92. ST 70 Power on!
  93. given choice of low screen voltage or low bias which sounds better or is it equal
  94. How many various OEM brands come from Shuguang?
  95. Bye for now! :)
  96. general power tube output impedance chart?
  97. Should I ground my ST 70?
  98. What is the biggest 300B tube? (Dimension)
  99. 6N16 Valve break-in time
  100. Mystery Amp.
  101. valves tungsten filament
  102. Musical Machine (triode PP EL34) question(s)
  103. M100 Output Tube Problem!
  104. Need to replace the power switch on an EAR 859
  105. Eico pentode vs triode VA
  106. gold grid 5881 - was I had?
  107. DN2540 CCS questions
  108. Operating point for pp KT88
  109. Low THD of Opt Cathode feedback
  110. No bias in S-5 12K, 8L, 16L, etc?
  111. Wanted...broken Golden Tube Audio SE-40
  112. Precise 116 Data Needed
  113. Can you bi-wire using two different taps
  114. Transient Responce of Williamson Amp build
  115. Tantalum caps in the filament supply?
  116. Assistance needed in reconstructing a Golden Tube Audio SE-40
  117. interesting power tube comparison chart
  118. 833A and 3-500Z Circuits
  119. Pilot SA-260 amp and Fischer 400C advice
  120. Long tailed pair phase inverter issues
  121. advice on changing bridge rectifier
  122. 21st Century Maida Regulator
  123. 6CA7 UL Push Pull Amp Design
  124. Tube recommendations anyone?
  125. WE 2C51 Date codes
  126. T500-1 - any ideas?
  127. hybrid power amp and more questions
  128. Yaqin MC-100B - not as powerful as advertised, but still a good value.
  129. 6CB5 AMP BUILD.
  130. ABB France SE OPT??
  131. heater wiring
  132. Audioromy FU29 improvement and upgrades?
  133. Need VFD display filament driver
  134. Power Transformer Limitations
  135. Yaqin 100b channel imbalance
  136. Grid stoppers in class AB2 push-pull arrangenets?
  137. Glass bead inside of KT88
  138. Find tube tester!
  139. mono block amps with 2 x 833C overkill ? even possible to DIY?
  140. happiness is a box of 6550 NOS tubes
  141. Taming the 83
  142. 6550 tube bias characters
  143. Tube Amp Squeel
  144. Bias help Music Angel L$, EL84
  145. Stubborn Oscillation
  146. Moderm "high watt" resistors seem too small
  147. Thyratron based emergency switch?
  148. vT4C.com out of business....
  149. Maggie 8802 6V6
  150. Need Counterpoint SA-3 Board Photo
  151. Diodes in a Graetz Hybrid
  152. Tube Noob with a few questions
  153. KT88 Push Pull Idea... Questions
  154. Superior Instruments tv11 restore question?
  155. Superior Instruments tv11 restore question?
  156. Frequency Response of Output Tubes
  157. symptom of a dying (gain) tube
  158. Grounding in monoblock amps
  159. Seeking 6ME5 data and connection diagram
  160. 12BK5 UL tracing gone boosted triode?
  161. Difference between OPT
  162. Tweaking PP AMP Suggestions Please
  163. DC coupled Sand 'n Glass with Current Feedback
  164. Yaqin 100B fire and spares
  165. Pls help with a preamp
  166. Questions about Aikdo all in one octal
  167. Did I get used to my amp's sound?
  168. Michaelson and Austin TVA1 revB
  169. Joy of birth - a new preamp brought to the world
  170. 5U4G
  171. 6N6P best musicality? Help with modes.
  172. Identifying this capacitor in my Cayin TA-30 amp
  173. GU50 Push-Pull version1
  174. Common mode feedback
  175. Stuck with repair ;(
  176. active hum cancellation. PCB idea?
  177. Why this huge cap is so light?
  178. OPT performance
  179. Capacitor WVDC. is higher really better?
  180. Tung Sol ECC803S reissue - thumbs down
  181. Biasing Marshall 9200
  182. In a search for a 6CG7 line stage schematic
  183. Output stage for a Mono FM tube tuner
  184. Want to use El Cheapo P.I. for Scott LK72 rebuild
  185. Ansar caps
  186. TO220 isolation kits breakdown
  187. Schematic for Sony TC-200 tape unit
  188. HV power supply with serial chokes
  189. no logo on tube
  190. Tango XE-20-600S SE OPT for preamp ?
  191. RF Voltage Amplifier
  192. Anyone deal with psvane member here?
  193. Op Amp
  194. Imbalanced LTP using 6922/E88CC
  195. OPT choice for PP1C
  196. Drawing software for P2P layout?
  197. A hybrid amplifier with PCC88 and IRFP240/9240
  198. ARC D-75A Regulator tube
  199. cap upgrade worth it?
  200. valve/tube output transformer construction
  201. 300B (or other DHT) biasing options
  202. Cathode Bypass Capacitor concern
  203. Phase splitter into push pull front end - possible?
  204. Question on push-pull OT LEads
  205. Importance of Screen Voltage of Pentode???
  206. measuring dc offset in OTL headphone amp
  207. Seeking comments on Russian KBG-MN for PS
  208. Joe List Archive
  209. grundig tk45
  210. Grid bias - sound quality of battery or PSU?
  211. Help: Western Electric 418A tubes wire in triode ?
  212. Scott 355 Tuner-Preamp
  213. 6550 internal resistance hit parade
  214. Max anode voltage and srpp/aikido amps
  215. Effect of IERC coolers on SQ
  216. Tube standoff ?
  217. YAQIN MS-650B vs Yarland PRO 845 mkIV ?
  218. New Harman Kardon Citation II
  219. Conrad johnson Preamp Volume
  220. What's the benefit of dual NFB?
  221. Over-Spec'd PT as replacement.
  222. pp KT88, IT phase splitter
  223. ID this for me?
  224. 12AX7 in starving mode Dynaco PAS3X
  225. YAQIN MS-22B. Any thoughts, please?
  226. Heathkit A7E phono section
  227. Dyna-Quik 500
  228. Driving balanced outputs
  229. Primary current feedback - any good? Help!
  230. 3C30 tube...datasheet...help !!!
  231. LEDs on input valve cathodes
  232. Help with Conrad Johnson
  233. Output Transformer Power Rating Question
  234. Little piece of glass in tube.
  235. ASL Preamp Help
  236. Start to Salivate - My Tube Amp Candidates - Your thoughts welcome
  237. Citation V OPT Diagnosis/Question...
  238. Cossor BT185 Beam tetrode
  239. Using a non-bridge (2 diode) full wave rectifier in bias supply.
  240. Amp making phase shifter noise
  241. Help, Amp distortion after on/off/on???
  242. TDO 5w resistors?
  243. Audio Research Dual 75 - Low Bias
  244. 6N3 SRPP + 6N5P Cathode Follower HPA Testing
  245. 6N16 headphone amplifier
  246. 5k plate to plate, el34 triode strapped, 400v b+
  247. russian penthodes 6J2P-EB and 6J9P.
  248. mA meter drags the circuit down
  249. Valve stage coupling capacitor leakage?
  250. Carvin Transformer

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