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  1. Determing the reason for mystery? cap in schematic.
  2. Dyna ST70 to Dual-differential EL34 triode amp project
  3. Tube Signal to Noise Ratio / Dynamic Range
  4. fluctating bias
  5. Just tried a Wire Wound pot for volume.
  6. LED's in the cathode..
  7. Dr. Arthur Loesch
  8. Counterpoint SA-220 mods
  9. Broskie P-P Bridged Output Stage
  10. Would a member fluent in technical German please have a look at this link?
  11. Damaged tube? EL84
  12. Heathkit AA-161 EL84/6BQ5 PP mono integrated amp mod
  13. vk-2100 mod question please
  14. Heater supply
  15. 6111/6n16b - linestage noise problem
  16. OPT specs
  17. Re: Tube Line gain stage with pcc88 or ecc82
  18. Knight-kit KA-55
  19. Can I delay part of a B supply this way?
  20. Tube Preamp turn on circuit
  21. SE GM-70 for 700-800 euro?
  22. filter cap markings
  23. tube buffer noise cancellation
  24. PSUD 2
  25. Bypassing filter caps with Smaller caps
  26. balancing resister for series capacitor in a power supply
  27. Yaqin MC-100b- TJ Full Music 6sn7
  28. Forgive me for I have sinned. Help with Volume Pot!
  29. Help with diagnoses for leak 20 PLEASE
  30. Suggested Circuit Changes to use EM80 in place of 6E2 Eye
  31. Fred Nachbaur SET amp: input capacitor
  32. Heathkit scu 1 and knight kn924 needed schematics
  33. Journey to the centre of a tube..
  34. RIP Dr Jim Marshall
  35. some questions about an ECL82 SE amp
  36. Heathkit Sine/Square wave Generator Manual needed!
  37. SRPP Signal Output Capacitors
  38. simple se input impedance
  39. Kt120 screen current
  40. New or used output xformers to play around with?
  41. Magnavox amp
  42. Help hooking up panel ammeter for bias adjust
  43. opt A-440
  44. OTL Headphone amplifier with Tube ED8000
  45. NJ7P Gone?
  46. MYSTERY METAL TUBES B-1532
  47. noisy tubes
  48. Old amp hum repair
  49. Traveling with DIY Kit in USA-Airport Security Question
  50. Hammond 1650P vs 1650N For EL34 PP
  51. Calibrate a Hickok 6000?
  52. Blown Output Tubes
  53. Kriesler Radiogram refurbishment questions
  54. 6P15P socket connection
  55. Revision 2. Balanced
  56. 6V6 schematic
  57. 6h23N test setting?
  58. 12AH7GT
  59. TUBE Tape Head record / playback amp....
  60. Strange couple comportament 6L6GC RCA black plates.
  61. Reduce Output Volume
  62. Differential Amp CCS Tail SVCS Plate - Noise Issues
  63. Triode curves for EL/PL519
  64. Is that a SRPP circuit with 6SN7?
  65. KT33 Push Pull
  66. Rogers Cadet III Integrated Amp Capacitor Values help
  67. 2a3 alternative after NOS burning
  68. 6SN7 SRPP - oscillating dc offset
  69. Hickok TV-2 'percent quality'
  70. Another Tube I/V converter/preamp for balanced DACs with SE output:build thread
  71. Aikido LV 48V ECC99 or 6N6p
  72. Project: Ultra Small 6C33 / Hybrid Stereo Headphone Amplifier
  73. Back to the tubes
  74. Any use for these PAECO transformer?
  75. Video lectures on tube amplifier design
  76. Millett PP or Allen Wright's PP-2c or?
  77. Magnavox 8608-10
  78. Time relay
  79. Help with Music Angel XD800MKIII mods!?
  80. Little Dot MKIII ??????
  81. Cathode follower wideband amplifier
  82. Wrong base ???
  83. My first DIY schematic... need eagle eyes.!
  84. Stubborn Noise/Oscillation - Another Call for Help
  85. help with power tranny
  86. Tube Amp Repair - SE Michigan
  87. ST 70 Power on!
  88. given choice of low screen voltage or low bias which sounds better or is it equal
  89. How many various OEM brands come from Shuguang?
  90. Bye for now! :)
  91. general power tube output impedance chart?
  92. Should I ground my ST 70?
  93. What is the biggest 300B tube? (Dimension)
  94. 6N16 Valve break-in time
  95. Mystery Amp.
  96. valves tungsten filament
  97. Musical Machine (triode PP EL34) question(s)
  98. M100 Output Tube Problem!
  99. Need to replace the power switch on an EAR 859
  100. Eico pentode vs triode VA
  101. gold grid 5881 - was I had?
  102. DN2540 CCS questions
  103. Operating point for pp KT88
  104. Low THD of Opt Cathode feedback
  105. No bias in S-5 12K, 8L, 16L, etc?
  106. Wanted...broken Golden Tube Audio SE-40
  107. Precise 116 Data Needed
  108. Can you bi-wire using two different taps
  109. Transient Responce of Williamson Amp build
  110. Tantalum caps in the filament supply?
  111. Assistance needed in reconstructing a Golden Tube Audio SE-40
  112. interesting power tube comparison chart
  113. 833A and 3-500Z Circuits
  114. Pilot SA-260 amp and Fischer 400C advice
  115. Long tailed pair phase inverter issues
  116. advice on changing bridge rectifier
  117. 21st Century Maida Regulator
  118. 6CA7 UL Push Pull Amp Design
  119. Tube recommendations anyone?
  120. WE 2C51 Date codes
  121. T500-1 - any ideas?
  122. hybrid power amp and more questions
  123. Yaqin MC-100B - not as powerful as advertised, but still a good value.
  124. 6CB5 AMP BUILD.
  125. ABB France SE OPT??
  126. heater wiring
  127. Audioromy FU29 improvement and upgrades?
  128. Need VFD display filament driver
  129. Power Transformer Limitations
  130. Yaqin 100b channel imbalance
  131. Grid stoppers in class AB2 push-pull arrangenets?
  132. Glass bead inside of KT88
  133. Find tube tester!
  134. mono block amps with 2 x 833C overkill ? even possible to DIY?
  135. happiness is a box of 6550 NOS tubes
  136. Taming the 83
  137. 6550 tube bias characters
  138. Tube Amp Squeel
  139. Bias help Music Angel L$, EL84
  140. Stubborn Oscillation
  141. Moderm "high watt" resistors seem too small
  142. Thyratron based emergency switch?
  143. vT4C.com out of business....
  144. Maggie 8802 6V6
  145. Need Counterpoint SA-3 Board Photo
  146. Diodes in a Graetz Hybrid
  147. Tube Noob with a few questions
  148. KT88 Push Pull Idea... Questions
  149. Superior Instruments tv11 restore question?
  150. Superior Instruments tv11 restore question?
  151. Frequency Response of Output Tubes
  152. symptom of a dying (gain) tube
  153. Grounding in monoblock amps
  154. Seeking 6ME5 data and connection diagram
  155. 12BK5 UL tracing gone boosted triode?
  156. Difference between OPT
  157. Tweaking PP AMP Suggestions Please
  158. DC coupled Sand 'n Glass with Current Feedback
  159. Yaqin 100B fire and spares
  160. Pls help with a preamp
  161. Questions about Aikdo all in one octal
  162. Did I get used to my amp's sound?
  163. Michaelson and Austin TVA1 revB
  164. Joy of birth - a new preamp brought to the world
  165. 5U4G
  166. 6N6P best musicality? Help with modes.
  167. Identifying this capacitor in my Cayin TA-30 amp
  168. GU50 Push-Pull version1
  169. Common mode feedback
  170. Stuck with repair ;(
  171. active hum cancellation. PCB idea?
  172. Why this huge cap is so light?
  173. OPT performance
  174. Capacitor WVDC. is higher really better?
  175. Tung Sol ECC803S reissue - thumbs down
  176. Biasing Marshall 9200
  177. In a search for a 6CG7 line stage schematic
  178. Output stage for a Mono FM tube tuner
  179. Want to use El Cheapo P.I. for Scott LK72 rebuild
  180. Ansar caps
  181. TO220 isolation kits breakdown
  182. Schematic for Sony TC-200 tape unit
  183. HV power supply with serial chokes
  184. no logo on tube
  185. Tango XE-20-600S SE OPT for preamp ?
  186. RF Voltage Amplifier
  187. Anyone deal with psvane member here?
  188. Op Amp
  189. Imbalanced LTP using 6922/E88CC
  190. OPT choice for PP1C
  191. Drawing software for P2P layout?
  192. A hybrid amplifier with PCC88 and IRFP240/9240
  193. ARC D-75A Regulator tube
  194. cap upgrade worth it?
  195. valve/tube output transformer construction
  196. 300B (or other DHT) biasing options
  197. Cathode Bypass Capacitor concern
  198. Phase splitter into push pull front end - possible?
  199. Question on push-pull OT LEads
  200. Importance of Screen Voltage of Pentode???
  201. measuring dc offset in OTL headphone amp
  202. Seeking comments on Russian KBG-MN for PS
  203. Joe List Archive
  204. grundig tk45
  205. Grid bias - sound quality of battery or PSU?
  206. Help: Western Electric 418A tubes wire in triode ?
  207. Scott 355 Tuner-Preamp
  208. 6550 internal resistance hit parade
  209. Max anode voltage and srpp/aikido amps
  210. Effect of IERC coolers on SQ
  211. Tube standoff ?
  212. YAQIN MS-650B vs Yarland PRO 845 mkIV ?
  213. New Harman Kardon Citation II
  214. Conrad johnson Preamp Volume
  215. What's the benefit of dual NFB?
  216. Over-Spec'd PT as replacement.
  217. pp KT88, IT phase splitter
  218. ID this for me?
  219. 12AX7 in starving mode Dynaco PAS3X
  220. YAQIN MS-22B. Any thoughts, please?
  221. Heathkit A7E phono section
  222. Dyna-Quik 500
  223. Driving balanced outputs
  224. Primary current feedback - any good? Help!
  225. 3C30 tube...datasheet...help !!!
  226. LEDs on input valve cathodes
  227. Help with Conrad Johnson
  228. Output Transformer Power Rating Question
  229. Little piece of glass in tube.
  230. ASL Preamp Help
  231. Start to Salivate - My Tube Amp Candidates - Your thoughts welcome
  232. Citation V OPT Diagnosis/Question...
  233. Cossor BT185 Beam tetrode
  234. Using a non-bridge (2 diode) full wave rectifier in bias supply.
  235. Amp making phase shifter noise
  236. Help, Amp distortion after on/off/on???
  237. TDO 5w resistors?
  238. Audio Research Dual 75 - Low Bias
  239. 6N3 SRPP + 6N5P Cathode Follower HPA Testing
  240. 6N16 headphone amplifier
  241. 5k plate to plate, el34 triode strapped, 400v b+
  242. russian penthodes 6J2P-EB and 6J9P.
  243. mA meter drags the circuit down
  244. Valve stage coupling capacitor leakage?
  245. Carvin Transformer
  246. Modifying the Lowther Club HK Jazz 6L6 ($449 SET amp)
  247. RCA 6V6PP amp schematic (Schade fb)
  248. 25W Class A Hybrid Amp
  249. help testing gz32 gz34
  250. A BeamKido?

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