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  1. Merlyn- May AudioXpress
  2. How to clean tubes?
  3. does the 3A5 have the stones to drive a 2A3?
  4. New amp: 13DE7 SE hybrid
  5. My amp is motorboating, improve it with b+ regulator ?
  6. Can you identify these amps?
  7. Sowter SA01 - anyone used it ?
  8. Mikael‑Abdellah‑SE‑KT88 Bias & Voltage readings Help?
  9. Resistors and combinations
  10. thr light in pcl82
  11. Bogen L330 - Worth restoring?
  12. Supro model 24 amp transformers
  13. Those Magnificent Television Tubes
  14. Demagnetizing OPT?
  15. Real DIY fun hybrid testing.
  16. Extreme hum in EQ output
  17. 46 triode-strapped DHT spice model
  18. SET output impedance vs speaker impedance
  19. Help with layout of tube preamp
  20. eico HF-65
  21. Wirewound bias pot problem.
  22. Driver for Telefunken RS242 in class A2
  23. Help on my signal generator
  24. another tube fact or fallacy
  25. Gap in Transformer Lams - OCD Check
  26. how to test...
  27. chinese tube amp
  28. tube/valve pc-80
  29. GM-70 All done
  30. Peavey 60/60 classic series schematic
  31. preamp for reciever?
  32. Designing a Tube Rectifier Circuit
  33. Bogen RP40A transformers....what to build with them?
  34. Harmony guitar amp restoration questions
  35. Heads Up for "El Cheapo" Builders
  36. replacing kt66 valves
  37. Help with power transformer identification
  38. 6-8x el84 Per channel
  39. To vary a signal pentode to triode in stages
  40. I have 2 choices for resistive load, need opinions.
  41. Tesla PCC88 7DJ8 dual triode - Help Needed.
  42. PP6550
  43. LT1083 interesting startup problem
  44. ECC33 Driver Stage
  45. Hiraga's Improved Concertina Phase Splitter
  46. 274B a direct replacement for 5AR4/GZ34?
  47. Help power up akai M8 amps
  48. Sonic Frontiers Power 3 Help!
  49. ImPasse Preamp now online
  50. Power supply for tube preamplifier with PCC88
  51. Don't know where to start...
  52. DIY noob
  53. 300B amp cathode bypass
  54. Amp hum with Preamp off
  55. First Project with these tubes
  56. 7189a socket rewiring
  57. Hybrid rectifiers in PSUD2
  58. Feedback / experience wanted on building the Audio note L4 Integrated EL34 PP Amp Kit
  59. About 6AS7BTL Amp
  60. Output Stage Protection Circuit
  61. Silly basic layout question - AC heaters
  62. heater voltage variation for special tubes
  63. Want to build a 807 Vixen.. Looking for help.
  64. Connecting Speakers to Yaqin 10L
  65. Gyrator Filter
  66. 6ab4 tube socket mounting
  67. Any Moto heads? Need OT advice please
  68. Did I break my tube? (new blue glow)
  69. I need help with ccs based LTP
  70. 4033L- rare triode tube.
  71. Single tube linestage schematic wanted: 8CG7
  72. Tetra Sans PS
  73. Tone controls
  74. Vintage Heathkit Electronic Switch as soundcard interface
  75. K-12M extra caps??
  76. Looking for Tube Amp Kit Recommendations
  77. magnatone 280 schematic
  78. high voltage after cap. change
  79. My first tube amp
  80. Recommendations for 6888 triode operating point?
  81. Mullard 12AX7 part uniformity
  82. 6n15n-EB confusion
  83. Noob Question: Phono Preamp
  84. Transformer data required P782
  85. Snubbers on Power Transformer Secondaries
  86. CCS for 6V6 PP amp
  87. screen voltage for triode strapped pentode
  88. New Driver
  89. purpose and value importance of resistor
  90. Values for Vintage Amp's & Preamp's Paragon 12(70's) & More
  91. Help with amp please.
  92. Another Discrete Current Source
  93. 834 Triode amp
  94. Determing the reason for mystery? cap in schematic.
  95. Dyna ST70 to Dual-differential EL34 triode amp project
  96. Tube Signal to Noise Ratio / Dynamic Range
  97. fluctating bias
  98. Just tried a Wire Wound pot for volume.
  99. LED's in the cathode..
  100. Dr. Arthur Loesch
  101. Counterpoint SA-220 mods
  102. Broskie P-P Bridged Output Stage
  103. Would a member fluent in technical German please have a look at this link?
  104. Damaged tube? EL84
  105. Heathkit AA-161 EL84/6BQ5 PP mono integrated amp mod
  106. vk-2100 mod question please
  107. Heater supply
  108. 6111/6n16b - linestage noise problem
  109. OPT specs
  110. Re: Tube Line gain stage with pcc88 or ecc82
  111. Knight-kit KA-55
  112. Can I delay part of a B supply this way?
  113. Tube Preamp turn on circuit
  114. SE GM-70 for 700-800 euro?
  115. filter cap markings
  116. tube buffer noise cancellation
  117. PSUD 2
  118. Bypassing filter caps with Smaller caps
  119. balancing resister for series capacitor in a power supply
  120. Yaqin MC-100b- TJ Full Music 6sn7
  121. Forgive me for I have sinned. Help with Volume Pot!
  122. Help with diagnoses for leak 20 PLEASE
  123. Suggested Circuit Changes to use EM80 in place of 6E2 Eye
  124. Fred Nachbaur SET amp: input capacitor
  125. Heathkit scu 1 and knight kn924 needed schematics
  126. Journey to the centre of a tube..
  127. RIP Dr Jim Marshall
  128. some questions about an ECL82 SE amp
  129. Heathkit Sine/Square wave Generator Manual needed!
  130. SRPP Signal Output Capacitors
  131. simple se input impedance
  132. Kt120 screen current
  133. New or used output xformers to play around with?
  134. Magnavox amp
  135. Help hooking up panel ammeter for bias adjust
  136. opt A-440
  137. OTL Headphone amplifier with Tube ED8000
  138. NJ7P Gone?
  139. MYSTERY METAL TUBES B-1532
  140. noisy tubes
  141. Old amp hum repair
  142. Traveling with DIY Kit in USA-Airport Security Question
  143. Hammond 1650P vs 1650N For EL34 PP
  144. Calibrate a Hickok 6000?
  145. Blown Output Tubes
  146. Kriesler Radiogram refurbishment questions
  147. 6P15P socket connection
  148. Revision 2. Balanced
  149. 6V6 schematic
  150. 6h23N test setting?
  151. 12AH7GT
  152. TUBE Tape Head record / playback amp....
  153. Strange couple comportament 6L6GC RCA black plates.
  154. Reduce Output Volume
  155. Differential Amp CCS Tail SVCS Plate - Noise Issues
  156. Triode curves for EL/PL519
  157. Is that a SRPP circuit with 6SN7?
  158. KT33 Push Pull
  159. Rogers Cadet III Integrated Amp Capacitor Values help
  160. 2a3 alternative after NOS burning
  161. 6SN7 SRPP - oscillating dc offset
  162. Hickok TV-2 'percent quality'
  163. Another Tube I/V converter/preamp for balanced DACs with SE output:build thread
  164. Aikido LV 48V ECC99 or 6N6p
  165. Project: Ultra Small 6C33 / Hybrid Stereo Headphone Amplifier
  166. Back to the tubes
  167. Any use for these PAECO transformer?
  168. Video lectures on tube amplifier design
  169. Millett PP or Allen Wright's PP-2c or?
  170. Magnavox 8608-10
  171. Time relay
  172. Help with Music Angel XD800MKIII mods!?
  173. Little Dot MKIII ??????
  174. Cathode follower wideband amplifier
  175. Wrong base ???
  176. My first DIY schematic... need eagle eyes.!
  177. Stubborn Noise/Oscillation - Another Call for Help
  178. help with power tranny
  179. Tube Amp Repair - SE Michigan
  180. ST 70 Power on!
  181. given choice of low screen voltage or low bias which sounds better or is it equal
  182. How many various OEM brands come from Shuguang?
  183. Bye for now! :)
  184. general power tube output impedance chart?
  185. Should I ground my ST 70?
  186. What is the biggest 300B tube? (Dimension)
  187. 6N16 Valve break-in time
  188. Mystery Amp.
  189. valves tungsten filament
  190. Musical Machine (triode PP EL34) question(s)
  191. M100 Output Tube Problem!
  192. Need to replace the power switch on an EAR 859
  193. Eico pentode vs triode VA
  194. gold grid 5881 - was I had?
  195. DN2540 CCS questions
  196. Operating point for pp KT88
  197. Low THD of Opt Cathode feedback
  198. No bias in S-5 12K, 8L, 16L, etc?
  199. Wanted...broken Golden Tube Audio SE-40
  200. Precise 116 Data Needed
  201. Can you bi-wire using two different taps
  202. Transient Responce of Williamson Amp build
  203. Tantalum caps in the filament supply?
  204. Assistance needed in reconstructing a Golden Tube Audio SE-40
  205. interesting power tube comparison chart
  206. 833A and 3-500Z Circuits
  207. Pilot SA-260 amp and Fischer 400C advice
  208. Long tailed pair phase inverter issues
  209. advice on changing bridge rectifier
  210. 21st Century Maida Regulator
  211. 6CA7 UL Push Pull Amp Design
  212. Tube recommendations anyone?
  213. WE 2C51 Date codes
  214. T500-1 - any ideas?
  215. hybrid power amp and more questions
  216. Yaqin MC-100B - not as powerful as advertised, but still a good value.
  217. 6CB5 AMP BUILD.
  218. ABB France SE OPT??
  219. heater wiring
  220. Audioromy FU29 improvement and upgrades?
  221. Need VFD display filament driver
  222. Power Transformer Limitations
  223. Yaqin 100b channel imbalance
  224. Grid stoppers in class AB2 push-pull arrangenets?
  225. Glass bead inside of KT88
  226. Find tube tester!
  227. mono block amps with 2 x 833C overkill ? even possible to DIY?
  228. happiness is a box of 6550 NOS tubes
  229. Taming the 83
  230. 6550 tube bias characters
  231. Tube Amp Squeel
  232. Bias help Music Angel L$, EL84
  233. Stubborn Oscillation
  234. Moderm "high watt" resistors seem too small
  235. Thyratron based emergency switch?
  236. vT4C.com out of business....
  237. Maggie 8802 6V6
  238. Need Counterpoint SA-3 Board Photo
  239. Diodes in a Graetz Hybrid
  240. Tube Noob with a few questions
  241. KT88 Push Pull Idea... Questions
  242. Superior Instruments tv11 restore question?
  243. Superior Instruments tv11 restore question?
  244. Frequency Response of Output Tubes
  245. symptom of a dying (gain) tube
  246. Grounding in monoblock amps
  247. Seeking 6ME5 data and connection diagram
  248. 12BK5 UL tracing gone boosted triode?
  249. Difference between OPT
  250. Tweaking PP AMP Suggestions Please

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