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  1. MYSTERY METAL TUBES B-1532
  2. noisy tubes
  3. Old amp hum repair
  4. Traveling with DIY Kit in USA-Airport Security Question
  5. Hammond 1650P vs 1650N For EL34 PP
  6. Calibrate a Hickok 6000?
  7. Blown Output Tubes
  8. Kriesler Radiogram refurbishment questions
  9. 6P15P socket connection
  10. Revision 2. Balanced
  11. 6V6 schematic
  12. 6h23N test setting?
  13. 12AH7GT
  14. TUBE Tape Head record / playback amp....
  15. Strange couple comportament 6L6GC RCA black plates.
  16. Reduce Output Volume
  17. Differential Amp CCS Tail SVCS Plate - Noise Issues
  18. Triode curves for EL/PL519
  19. Is that a SRPP circuit with 6SN7?
  20. KT33 Push Pull
  21. Rogers Cadet III Integrated Amp Capacitor Values help
  22. 2a3 alternative after NOS burning
  23. 6SN7 SRPP - oscillating dc offset
  24. Hickok TV-2 'percent quality'
  25. Another Tube I/V converter/preamp for balanced DACs with SE output:build thread
  26. Aikido LV 48V ECC99 or 6N6p
  27. Project: Ultra Small 6C33 / Hybrid Stereo Headphone Amplifier
  28. Back to the tubes
  29. Any use for these PAECO transformer?
  30. Video lectures on tube amplifier design
  31. Millett PP or Allen Wright's PP-2c or?
  32. Magnavox 8608-10
  33. Time relay
  34. Help with Music Angel XD800MKIII mods!?
  35. Little Dot MKIII ??????
  36. Cathode follower wideband amplifier
  37. Wrong base ???
  38. My first DIY schematic... need eagle eyes.!
  39. Stubborn Noise/Oscillation - Another Call for Help
  40. help with power tranny
  41. Tube Amp Repair - SE Michigan
  42. ST 70 Power on!
  43. given choice of low screen voltage or low bias which sounds better or is it equal
  44. How many various OEM brands come from Shuguang?
  45. Bye for now! :)
  46. general power tube output impedance chart?
  47. Should I ground my ST 70?
  48. What is the biggest 300B tube? (Dimension)
  49. 6N16 Valve break-in time
  50. Mystery Amp.
  51. valves tungsten filament
  52. Musical Machine (triode PP EL34) question(s)
  53. M100 Output Tube Problem!
  54. Need to replace the power switch on an EAR 859
  55. Eico pentode vs triode VA
  56. gold grid 5881 - was I had?
  57. DN2540 CCS questions
  58. Operating point for pp KT88
  59. Low THD of Opt Cathode feedback
  60. No bias in S-5 12K, 8L, 16L, etc?
  61. Wanted...broken Golden Tube Audio SE-40
  62. Precise 116 Data Needed
  63. Can you bi-wire using two different taps
  64. Transient Responce of Williamson Amp build
  65. Tantalum caps in the filament supply?
  66. Assistance needed in reconstructing a Golden Tube Audio SE-40
  67. interesting power tube comparison chart
  68. 833A and 3-500Z Circuits
  69. Pilot SA-260 amp and Fischer 400C advice
  70. Long tailed pair phase inverter issues
  71. advice on changing bridge rectifier
  72. 21st Century Maida Regulator
  73. 6CA7 UL Push Pull Amp Design
  74. Tube recommendations anyone?
  75. WE 2C51 Date codes
  76. T500-1 - any ideas?
  77. hybrid power amp and more questions
  78. Yaqin MC-100B - not as powerful as advertised, but still a good value.
  79. 6CB5 AMP BUILD.
  80. ABB France SE OPT??
  81. heater wiring
  82. Audioromy FU29 improvement and upgrades?
  83. Need VFD display filament driver
  84. Power Transformer Limitations
  85. Yaqin 100b channel imbalance
  86. Grid stoppers in class AB2 push-pull arrangenets?
  87. Glass bead inside of KT88
  88. Find tube tester!
  89. mono block amps with 2 x 833C overkill ? even possible to DIY?
  90. happiness is a box of 6550 NOS tubes
  91. Taming the 83
  92. 6550 tube bias characters
  93. Tube Amp Squeel
  94. Bias help Music Angel L$, EL84
  95. Stubborn Oscillation
  96. Moderm "high watt" resistors seem too small
  97. Thyratron based emergency switch?
  98. vT4C.com out of business....
  99. Maggie 8802 6V6
  100. Need Counterpoint SA-3 Board Photo
  101. Diodes in a Graetz Hybrid
  102. Tube Noob with a few questions
  103. KT88 Push Pull Idea... Questions
  104. Superior Instruments tv11 restore question?
  105. Superior Instruments tv11 restore question?
  106. Frequency Response of Output Tubes
  107. symptom of a dying (gain) tube
  108. Grounding in monoblock amps
  109. Seeking 6ME5 data and connection diagram
  110. 12BK5 UL tracing gone boosted triode?
  111. Difference between OPT
  112. Tweaking PP AMP Suggestions Please
  113. DC coupled Sand 'n Glass with Current Feedback
  114. Yaqin 100B fire and spares
  115. Pls help with a preamp
  116. Questions about Aikdo all in one octal
  117. Did I get used to my amp's sound?
  118. Michaelson and Austin TVA1 revB
  119. Joy of birth - a new preamp brought to the world
  120. 5U4G
  121. 6N6P best musicality? Help with modes.
  122. Identifying this capacitor in my Cayin TA-30 amp
  123. GU50 Push-Pull version1
  124. Common mode feedback
  125. Stuck with repair ;(
  126. active hum cancellation. PCB idea?
  127. Why this huge cap is so light?
  128. OPT performance
  129. Capacitor WVDC. is higher really better?
  130. Tung Sol ECC803S reissue - thumbs down
  131. Biasing Marshall 9200
  132. In a search for a 6CG7 line stage schematic
  133. Output stage for a Mono FM tube tuner
  134. Want to use El Cheapo P.I. for Scott LK72 rebuild
  135. Ansar caps
  136. TO220 isolation kits breakdown
  137. Schematic for Sony TC-200 tape unit
  138. HV power supply with serial chokes
  139. no logo on tube
  140. Tango XE-20-600S SE OPT for preamp ?
  141. RF Voltage Amplifier
  142. Anyone deal with psvane member here?
  143. Op Amp
  144. Imbalanced LTP using 6922/E88CC
  145. OPT choice for PP1C
  146. Drawing software for P2P layout?
  147. A hybrid amplifier with PCC88 and IRFP240/9240
  148. ARC D-75A Regulator tube
  149. cap upgrade worth it?
  150. valve/tube output transformer construction
  151. 300B (or other DHT) biasing options
  152. Cathode Bypass Capacitor concern
  153. Phase splitter into push pull front end - possible?
  154. Question on push-pull OT LEads
  155. Importance of Screen Voltage of Pentode???
  156. measuring dc offset in OTL headphone amp
  157. Seeking comments on Russian KBG-MN for PS
  158. Joe List Archive
  159. grundig tk45
  160. Grid bias - sound quality of battery or PSU?
  161. Help: Western Electric 418A tubes wire in triode ?
  162. Scott 355 Tuner-Preamp
  163. 6550 internal resistance hit parade
  164. Max anode voltage and srpp/aikido amps
  165. Effect of IERC coolers on SQ
  166. Tube standoff ?
  167. YAQIN MS-650B vs Yarland PRO 845 mkIV ?
  168. New Harman Kardon Citation II
  169. Conrad johnson Preamp Volume
  170. What's the benefit of dual NFB?
  171. Over-Spec'd PT as replacement.
  172. pp KT88, IT phase splitter
  173. ID this for me?
  174. 12AX7 in starving mode Dynaco PAS3X
  175. YAQIN MS-22B. Any thoughts, please?
  176. Heathkit A7E phono section
  177. Dyna-Quik 500
  178. Driving balanced outputs
  179. Primary current feedback - any good? Help!
  180. 3C30 tube...datasheet...help !!!
  181. LEDs on input valve cathodes
  182. Help with Conrad Johnson
  183. Output Transformer Power Rating Question
  184. Little piece of glass in tube.
  185. ASL Preamp Help
  186. Start to Salivate - My Tube Amp Candidates - Your thoughts welcome
  187. Citation V OPT Diagnosis/Question...
  188. Cossor BT185 Beam tetrode
  189. Using a non-bridge (2 diode) full wave rectifier in bias supply.
  190. Amp making phase shifter noise
  191. Help, Amp distortion after on/off/on???
  192. TDO 5w resistors?
  193. Audio Research Dual 75 - Low Bias
  194. 6N3 SRPP + 6N5P Cathode Follower HPA Testing
  195. 6N16 headphone amplifier
  196. 5k plate to plate, el34 triode strapped, 400v b+
  197. russian penthodes 6J2P-EB and 6J9P.
  198. mA meter drags the circuit down
  199. Valve stage coupling capacitor leakage?
  200. Carvin Transformer
  201. Modifying the Lowther Club HK Jazz 6L6 ($449 SET amp)
  202. RCA 6V6PP amp schematic (Schade fb)
  203. 25W Class A Hybrid Amp
  204. help testing gz32 gz34
  205. A BeamKido?
  206. Zeners and voltage regulation
  207. A2 positive bias push pull possible?
  208. EL34 burn out on Yaqin MC10T
  209. input transformer and impedance question
  210. Options for 300mA tube rectifiers
  211. Electrical flow
  212. 5AR4 @ 250mA
  213. newbie with a choke question
  214. ROCKOAL JUKEBOX 1458
  215. Who can help to recognize this tube preamp?
  216. DIY High power Audio Amplifier from Heathkit SB200
  217. ECL82 amplifier help
  218. 6146B SPICE model wanted
  219. how to install a bias meter in a cathode bias amp
  220. Stuck... Output tube for Single ended?
  221. Aikido Octal Headphone amp
  222. silvertone organ amp conversion. 4704
  223. Impedance bridging
  224. Philips AG-9016 frequency range?
  225. fuse voltage rating?
  226. Grounding issue between turntable and tube amp
  227. Great sounding KT88 amp?
  228. Designing a Gomes i/v stage for tda1541a
  229. choke input power supply
  230. Need Help with New Amp Build, Ugly signals
  231. Amplifier Saftey
  232. Cary SLM100 question (older brand)
  233. 6n18p 6n1p 6n2p project needed
  234. Heater wiring idea?
  235. 300B Amp Testing
  236. New amp build
  237. Bamboo chassis 6P3P SE
  238. 6N23P-EB SRPP DAC output stage.
  239. Packard Plamor Schematic needed
  240. Hickok 600A
  241. Opinion; Alternate input tube socket
  242. Very Simple Attenuator For Audio Card
  243. Switchable PI, Paraphase,Cathodyne, LTP.
  244. Hmm... 4-1000As
  245. Bootstrapped anode
  246. Selecting the correct output transformer/primary impedance
  247. Caddock MK-132 or Mills MRA-12 as plate R?
  248. Minimum rating for stepdown transformer
  249. 6L6 Dared VP-20 issues
  250. Potentiometer Desigations/Codes

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