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  1. Fred Nachbaur SET amp: input capacitor
  2. Heathkit scu 1 and knight kn924 needed schematics
  3. Journey to the centre of a tube..
  4. some questions about an ECL82 SE amp
  5. Heathkit Sine/Square wave Generator Manual needed!
  6. SRPP Signal Output Capacitors
  7. Kt120 screen current
  8. New or used output xformers to play around with?
  9. Magnavox amp
  10. Help hooking up panel ammeter for bias adjust
  11. opt A-440
  12. OTL Headphone amplifier with Tube ED8000
  13. NJ7P Gone?
  14. MYSTERY METAL TUBES B-1532
  15. noisy tubes
  16. Old amp hum repair
  17. Traveling with DIY Kit in USA-Airport Security Question
  18. Hammond 1650P vs 1650N For EL34 PP
  19. Blown Output Tubes
  20. Kriesler Radiogram refurbishment questions
  21. 6P15P socket connection
  22. Revision 2. Balanced
  23. 6V6 schematic
  24. 6h23N test setting?
  25. 12AH7GT
  26. TUBE Tape Head record / playback amp....
  27. Strange couple comportament 6L6GC RCA black plates.
  28. Reduce Output Volume
  29. Differential Amp CCS Tail SVCS Plate - Noise Issues
  30. Triode curves for EL/PL519
  31. Is that a SRPP circuit with 6SN7?
  32. KT33 Push Pull
  33. Rogers Cadet III Integrated Amp Capacitor Values help
  34. 2a3 alternative after NOS burning
  35. 6SN7 SRPP - oscillating dc offset
  36. Another Tube I/V converter/preamp for balanced DACs with SE output:build thread
  37. Aikido LV 48V ECC99 or 6N6p
  38. Project: Ultra Small 6C33 / Hybrid Stereo Headphone Amplifier
  39. Back to the tubes
  40. Any use for these PAECO transformer?
  41. Video lectures on tube amplifier design
  42. Millett PP or Allen Wright's PP-2c or?
  43. Magnavox 8608-10
  44. Time relay
  45. Help with Music Angel XD800MKIII mods!?
  46. Little Dot MKIII ??????
  47. Cathode follower wideband amplifier
  48. Wrong base ???
  49. My first DIY schematic... need eagle eyes.!
  50. Stubborn Noise/Oscillation - Another Call for Help
  51. help with power tranny
  52. Tube Amp Repair - SE Michigan
  53. ST 70 Power on!
  54. given choice of low screen voltage or low bias which sounds better or is it equal
  55. How many various OEM brands come from Shuguang?
  56. Bye for now! :)
  57. general power tube output impedance chart?
  58. Should I ground my ST 70?
  59. What is the biggest 300B tube? (Dimension)
  60. 6N16 Valve break-in time
  61. Mystery Amp.
  62. valves tungsten filament
  63. Musical Machine (triode PP EL34) question(s)
  64. M100 Output Tube Problem!
  65. Need to replace the power switch on an EAR 859
  66. Eico pentode vs triode VA
  67. gold grid 5881 - was I had?
  68. DN2540 CCS questions
  69. Operating point for pp KT88
  70. Low THD of Opt Cathode feedback
  71. No bias in S-5 12K, 8L, 16L, etc?
  72. Wanted...broken Golden Tube Audio SE-40
  73. Precise 116 Data Needed
  74. Can you bi-wire using two different taps
  75. Transient Responce of Williamson Amp build
  76. Assistance needed in reconstructing a Golden Tube Audio SE-40
  77. interesting power tube comparison chart
  78. 833A and 3-500Z Circuits
  79. Pilot SA-260 amp and Fischer 400C advice
  80. Long tailed pair phase inverter issues
  81. advice on changing bridge rectifier
  82. 21st Century Maida Regulator
  83. 6CA7 UL Push Pull Amp Design
  84. Tube recommendations anyone?
  85. WE 2C51 Date codes
  86. T500-1 - any ideas?
  87. hybrid power amp and more questions
  88. Yaqin MC-100B - not as powerful as advertised, but still a good value.
  89. 6CB5 AMP BUILD.
  90. ABB France SE OPT??
  91. heater wiring
  92. Audioromy FU29 improvement and upgrades?
  93. Need VFD display filament driver
  94. Power Transformer Limitations
  95. Yaqin 100b channel imbalance
  96. Grid stoppers in class AB2 push-pull arrangenets?
  97. Glass bead inside of KT88
  98. mono block amps with 2 x 833C overkill ? even possible to DIY?
  99. happiness is a box of 6550 NOS tubes
  100. Taming the 83
  101. 6550 tube bias characters
  102. Tube Amp Squeel
  103. Bias help Music Angel L$, EL84
  104. Stubborn Oscillation
  105. Moderm "high watt" resistors seem too small
  106. Thyratron based emergency switch?
  107. vT4C.com out of business....
  108. Maggie 8802 6V6
  109. Need Counterpoint SA-3 Board Photo
  110. Diodes in a Graetz Hybrid
  111. Tube Noob with a few questions
  112. KT88 Push Pull Idea... Questions
  113. Superior Instruments tv11 restore question?
  114. Superior Instruments tv11 restore question?
  115. Frequency Response of Output Tubes
  116. symptom of a dying (gain) tube
  117. Grounding in monoblock amps
  118. Seeking 6ME5 data and connection diagram
  119. 12BK5 UL tracing gone boosted triode?
  120. Difference between OPT
  121. Tweaking PP AMP Suggestions Please
  122. DC coupled Sand 'n Glass with Current Feedback
  123. Yaqin 100B fire and spares
  124. Pls help with a preamp
  125. Questions about Aikdo all in one octal
  126. Did I get used to my amp's sound?
  127. Michaelson and Austin TVA1 revB
  128. Joy of birth - a new preamp brought to the world
  129. 5U4G
  130. 6N6P best musicality? Help with modes.
  131. Identifying this capacitor in my Cayin TA-30 amp
  132. GU50 Push-Pull version1
  133. Common mode feedback
  134. Stuck with repair ;(
  135. active hum cancellation. PCB idea?
  136. Why this huge cap is so light?
  137. OPT performance
  138. Tung Sol ECC803S reissue - thumbs down
  139. In a search for a 6CG7 line stage schematic
  140. Output stage for a Mono FM tube tuner
  141. Want to use El Cheapo P.I. for Scott LK72 rebuild
  142. TO220 isolation kits breakdown
  143. Schematic for Sony TC-200 tape unit
  144. HV power supply with serial chokes
  145. no logo on tube
  146. Tango XE-20-600S SE OPT for preamp ?
  147. RF Voltage Amplifier
  148. Anyone deal with psvane member here?
  149. Op Amp
  150. Imbalanced LTP using 6922/E88CC
  151. OPT choice for PP1C
  152. Drawing software for P2P layout?
  153. A hybrid amplifier with PCC88 and IRFP240/9240
  154. ARC D-75A Regulator tube
  155. cap upgrade worth it?
  156. valve/tube output transformer construction
  157. 300B (or other DHT) biasing options
  158. Cathode Bypass Capacitor concern
  159. Phase splitter into push pull front end - possible?
  160. Question on push-pull OT LEads
  161. Importance of Screen Voltage of Pentode???
  162. measuring dc offset in OTL headphone amp
  163. Seeking comments on Russian KBG-MN for PS
  164. Joe List Archive
  165. grundig tk45
  166. Grid bias - sound quality of battery or PSU?
  167. Help: Western Electric 418A tubes wire in triode ?
  168. Scott 355 Tuner-Preamp
  169. 6550 internal resistance hit parade
  170. Max anode voltage and srpp/aikido amps
  171. Effect of IERC coolers on SQ
  172. Tube standoff ?
  173. YAQIN MS-650B vs Yarland PRO 845 mkIV ?
  174. New Harman Kardon Citation II
  175. Conrad johnson Preamp Volume
  176. What's the benefit of dual NFB?
  177. Over-Spec'd PT as replacement.
  178. pp KT88, IT phase splitter
  179. ID this for me?
  180. 12AX7 in starving mode Dynaco PAS3X
  181. YAQIN MS-22B. Any thoughts, please?
  182. Heathkit A7E phono section
  183. Dyna-Quik 500
  184. Driving balanced outputs
  185. Primary current feedback - any good? Help!
  186. 3C30 tube...datasheet...help !!!
  187. LEDs on input valve cathodes
  188. Help with Conrad Johnson
  189. Output Transformer Power Rating Question
  190. Little piece of glass in tube.
  191. ASL Preamp Help
  192. Start to Salivate - My Tube Amp Candidates - Your thoughts welcome
  193. Citation V OPT Diagnosis/Question...
  194. Cossor BT185 Beam tetrode
  195. Using a non-bridge (2 diode) full wave rectifier in bias supply.
  196. Amp making phase shifter noise
  197. Help, Amp distortion after on/off/on???
  198. TDO 5w resistors?
  199. Audio Research Dual 75 - Low Bias
  200. 6N3 SRPP + 6N5P Cathode Follower HPA Testing
  201. 6N16 headphone amplifier
  202. 5k plate to plate, el34 triode strapped, 400v b+
  203. russian penthodes 6J2P-EB and 6J9P.
  204. mA meter drags the circuit down
  205. Valve stage coupling capacitor leakage?
  206. Carvin Transformer
  207. Modifying the Lowther Club HK Jazz 6L6 ($449 SET amp)
  208. RCA 6V6PP amp schematic (Schade fb)
  209. 25W Class A Hybrid Amp
  210. help testing gz32 gz34
  211. A BeamKido?
  212. Zeners and voltage regulation
  213. A2 positive bias push pull possible?
  214. EL34 burn out on Yaqin MC10T
  215. input transformer and impedance question
  216. Options for 300mA tube rectifiers
  217. Electrical flow
  218. 5AR4 @ 250mA
  219. newbie with a choke question
  220. ROCKOAL JUKEBOX 1458
  221. Who can help to recognize this tube preamp?
  222. DIY High power Audio Amplifier from Heathkit SB200
  223. ECL82 amplifier help
  224. 6146B SPICE model wanted
  225. how to install a bias meter in a cathode bias amp
  226. Stuck... Output tube for Single ended?
  227. Aikido Octal Headphone amp
  228. Impedance bridging
  229. Philips AG-9016 frequency range?
  230. fuse voltage rating?
  231. Grounding issue between turntable and tube amp
  232. Great sounding KT88 amp?
  233. Designing a Gomes i/v stage for tda1541a
  234. choke input power supply
  235. Need Help with New Amp Build, Ugly signals
  236. Amplifier Saftey
  237. Cary SLM100 question (older brand)
  238. 6n18p 6n1p 6n2p project needed
  239. Heater wiring idea?
  240. 300B Amp Testing
  241. New amp build
  242. Bamboo chassis 6P3P SE
  243. 6N23P-EB SRPP DAC output stage.
  244. Packard Plamor Schematic needed
  245. Opinion; Alternate input tube socket
  246. Very Simple Attenuator For Audio Card
  247. Switchable PI, Paraphase,Cathodyne, LTP.
  248. Hmm... 4-1000As
  249. Bootstrapped anode
  250. Selecting the correct output transformer/primary impedance

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