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  1. Tone controls
  2. Vintage Heathkit Electronic Switch as soundcard interface
  3. K-12M extra caps??
  4. Looking for Tube Amp Kit Recommendations
  5. magnatone 280 schematic
  6. high voltage after cap. change
  7. My first tube amp
  8. Recommendations for 6888 triode operating point?
  9. Mullard 12AX7 part uniformity
  10. 6n15n-EB confusion
  11. Noob Question: Phono Preamp
  12. Transformer data required P782
  13. Snubbers on Power Transformer Secondaries
  14. CCS for 6V6 PP amp
  15. screen voltage for triode strapped pentode
  16. New Driver
  17. purpose and value importance of resistor
  18. Values for Vintage Amp's & Preamp's Paragon 12(70's) & More
  19. Help with amp please.
  20. Another Discrete Current Source
  21. 834 Triode amp
  22. Determing the reason for mystery? cap in schematic.
  23. Dyna ST70 to Dual-differential EL34 triode amp project
  24. Tube Signal to Noise Ratio / Dynamic Range
  25. fluctating bias
  26. Just tried a Wire Wound pot for volume.
  27. LED's in the cathode..
  28. Dr. Arthur Loesch
  29. Counterpoint SA-220 mods
  30. Broskie P-P Bridged Output Stage
  31. Would a member fluent in technical German please have a look at this link?
  32. Damaged tube? EL84
  33. Heathkit AA-161 EL84/6BQ5 PP mono integrated amp mod
  34. vk-2100 mod question please
  35. Heater supply
  36. 6111/6n16b - linestage noise problem
  37. OPT specs
  38. Re: Tube Line gain stage with pcc88 or ecc82
  39. Knight-kit KA-55
  40. Can I delay part of a B supply this way?
  41. Tube Preamp turn on circuit
  42. SE GM-70 for 700-800 euro?
  43. filter cap markings
  44. tube buffer noise cancellation
  45. PSUD 2
  46. Bypassing filter caps with Smaller caps
  47. balancing resister for series capacitor in a power supply
  48. Yaqin MC-100b- TJ Full Music 6sn7
  49. Forgive me for I have sinned. Help with Volume Pot!
  50. Help with diagnoses for leak 20 PLEASE
  51. Suggested Circuit Changes to use EM80 in place of 6E2 Eye
  52. Fred Nachbaur SET amp: input capacitor
  53. Heathkit scu 1 and knight kn924 needed schematics
  54. Journey to the centre of a tube..
  55. RIP Dr Jim Marshall
  56. some questions about an ECL82 SE amp
  57. Heathkit Sine/Square wave Generator Manual needed!
  58. SRPP Signal Output Capacitors
  59. simple se input impedance
  60. Kt120 screen current
  61. New or used output xformers to play around with?
  62. Magnavox amp
  63. Help hooking up panel ammeter for bias adjust
  64. opt A-440
  65. OTL Headphone amplifier with Tube ED8000
  66. NJ7P Gone?
  67. MYSTERY METAL TUBES B-1532
  68. noisy tubes
  69. Old amp hum repair
  70. Traveling with DIY Kit in USA-Airport Security Question
  71. Hammond 1650P vs 1650N For EL34 PP
  72. Calibrate a Hickok 6000?
  73. Blown Output Tubes
  74. Kriesler Radiogram refurbishment questions
  75. 6P15P socket connection
  76. Revision 2. Balanced
  77. 6V6 schematic
  78. 6h23N test setting?
  79. 12AH7GT
  80. TUBE Tape Head record / playback amp....
  81. Strange couple comportament 6L6GC RCA black plates.
  82. Reduce Output Volume
  83. Differential Amp CCS Tail SVCS Plate - Noise Issues
  84. Triode curves for EL/PL519
  85. Is that a SRPP circuit with 6SN7?
  86. KT33 Push Pull
  87. Rogers Cadet III Integrated Amp Capacitor Values help
  88. 2a3 alternative after NOS burning
  89. 6SN7 SRPP - oscillating dc offset
  90. Hickok TV-2 'percent quality'
  91. Another Tube I/V converter/preamp for balanced DACs with SE output:build thread
  92. Aikido LV 48V ECC99 or 6N6p
  93. Project: Ultra Small 6C33 / Hybrid Stereo Headphone Amplifier
  94. Back to the tubes
  95. Any use for these PAECO transformer?
  96. Video lectures on tube amplifier design
  97. Millett PP or Allen Wright's PP-2c or?
  98. Magnavox 8608-10
  99. Time relay
  100. Help with Music Angel XD800MKIII mods!?
  101. Little Dot MKIII ??????
  102. Cathode follower wideband amplifier
  103. Wrong base ???
  104. My first DIY schematic... need eagle eyes.!
  105. Stubborn Noise/Oscillation - Another Call for Help
  106. help with power tranny
  107. Tube Amp Repair - SE Michigan
  108. ST 70 Power on!
  109. given choice of low screen voltage or low bias which sounds better or is it equal
  110. How many various OEM brands come from Shuguang?
  111. Bye for now! :)
  112. general power tube output impedance chart?
  113. Should I ground my ST 70?
  114. What is the biggest 300B tube? (Dimension)
  115. 6N16 Valve break-in time
  116. Mystery Amp.
  117. valves tungsten filament
  118. Musical Machine (triode PP EL34) question(s)
  119. M100 Output Tube Problem!
  120. Need to replace the power switch on an EAR 859
  121. Eico pentode vs triode VA
  122. gold grid 5881 - was I had?
  123. DN2540 CCS questions
  124. Operating point for pp KT88
  125. Low THD of Opt Cathode feedback
  126. No bias in S-5 12K, 8L, 16L, etc?
  127. Wanted...broken Golden Tube Audio SE-40
  128. Precise 116 Data Needed
  129. Can you bi-wire using two different taps
  130. Transient Responce of Williamson Amp build
  131. Tantalum caps in the filament supply?
  132. Assistance needed in reconstructing a Golden Tube Audio SE-40
  133. interesting power tube comparison chart
  134. 833A and 3-500Z Circuits
  135. Pilot SA-260 amp and Fischer 400C advice
  136. Long tailed pair phase inverter issues
  137. advice on changing bridge rectifier
  138. 21st Century Maida Regulator
  139. 6CA7 UL Push Pull Amp Design
  140. Tube recommendations anyone?
  141. WE 2C51 Date codes
  142. T500-1 - any ideas?
  143. hybrid power amp and more questions
  144. Yaqin MC-100B - not as powerful as advertised, but still a good value.
  145. 6CB5 AMP BUILD.
  146. ABB France SE OPT??
  147. heater wiring
  148. Audioromy FU29 improvement and upgrades?
  149. Need VFD display filament driver
  150. Power Transformer Limitations
  151. Yaqin 100b channel imbalance
  152. Grid stoppers in class AB2 push-pull arrangenets?
  153. Glass bead inside of KT88
  154. Find tube tester!
  155. mono block amps with 2 x 833C overkill ? even possible to DIY?
  156. happiness is a box of 6550 NOS tubes
  157. Taming the 83
  158. 6550 tube bias characters
  159. Tube Amp Squeel
  160. Bias help Music Angel L$, EL84
  161. Stubborn Oscillation
  162. Moderm "high watt" resistors seem too small
  163. Thyratron based emergency switch?
  164. vT4C.com out of business....
  165. Maggie 8802 6V6
  166. Need Counterpoint SA-3 Board Photo
  167. Diodes in a Graetz Hybrid
  168. Tube Noob with a few questions
  169. KT88 Push Pull Idea... Questions
  170. Superior Instruments tv11 restore question?
  171. Superior Instruments tv11 restore question?
  172. Frequency Response of Output Tubes
  173. symptom of a dying (gain) tube
  174. Grounding in monoblock amps
  175. Seeking 6ME5 data and connection diagram
  176. 12BK5 UL tracing gone boosted triode?
  177. Difference between OPT
  178. Tweaking PP AMP Suggestions Please
  179. DC coupled Sand 'n Glass with Current Feedback
  180. Yaqin 100B fire and spares
  181. Pls help with a preamp
  182. Questions about Aikdo all in one octal
  183. Did I get used to my amp's sound?
  184. Michaelson and Austin TVA1 revB
  185. Joy of birth - a new preamp brought to the world
  186. 5U4G
  187. 6N6P best musicality? Help with modes.
  188. Identifying this capacitor in my Cayin TA-30 amp
  189. GU50 Push-Pull version1
  190. Common mode feedback
  191. Stuck with repair ;(
  192. active hum cancellation. PCB idea?
  193. Why this huge cap is so light?
  194. OPT performance
  195. Capacitor WVDC. is higher really better?
  196. Tung Sol ECC803S reissue - thumbs down
  197. Biasing Marshall 9200
  198. In a search for a 6CG7 line stage schematic
  199. Output stage for a Mono FM tube tuner
  200. Want to use El Cheapo P.I. for Scott LK72 rebuild
  201. Ansar caps
  202. TO220 isolation kits breakdown
  203. Schematic for Sony TC-200 tape unit
  204. HV power supply with serial chokes
  205. no logo on tube
  206. Tango XE-20-600S SE OPT for preamp ?
  207. RF Voltage Amplifier
  208. Anyone deal with psvane member here?
  209. Op Amp
  210. Imbalanced LTP using 6922/E88CC
  211. OPT choice for PP1C
  212. Drawing software for P2P layout?
  213. A hybrid amplifier with PCC88 and IRFP240/9240
  214. ARC D-75A Regulator tube
  215. cap upgrade worth it?
  216. valve/tube output transformer construction
  217. 300B (or other DHT) biasing options
  218. Cathode Bypass Capacitor concern
  219. Phase splitter into push pull front end - possible?
  220. Question on push-pull OT LEads
  221. Importance of Screen Voltage of Pentode???
  222. measuring dc offset in OTL headphone amp
  223. Seeking comments on Russian KBG-MN for PS
  224. Joe List Archive
  225. grundig tk45
  226. Grid bias - sound quality of battery or PSU?
  227. Help: Western Electric 418A tubes wire in triode ?
  228. Scott 355 Tuner-Preamp
  229. 6550 internal resistance hit parade
  230. Max anode voltage and srpp/aikido amps
  231. Effect of IERC coolers on SQ
  232. Tube standoff ?
  233. YAQIN MS-650B vs Yarland PRO 845 mkIV ?
  234. New Harman Kardon Citation II
  235. Conrad johnson Preamp Volume
  236. What's the benefit of dual NFB?
  237. Over-Spec'd PT as replacement.
  238. pp KT88, IT phase splitter
  239. ID this for me?
  240. 12AX7 in starving mode Dynaco PAS3X
  241. YAQIN MS-22B. Any thoughts, please?
  242. Heathkit A7E phono section
  243. Dyna-Quik 500
  244. Driving balanced outputs
  245. Primary current feedback - any good? Help!
  246. 3C30 tube...datasheet...help !!!
  247. LEDs on input valve cathodes
  248. Help with Conrad Johnson
  249. Output Transformer Power Rating Question
  250. Little piece of glass in tube.

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