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  1. Line stage with u-follower and nfb
  2. Newbie looking for help, pre-out to tube amp.
  3. Unison research integrated ampliphier schematics
  4. FET CCS anode load and RFI/oscillation.
  5. Old schematic
  6. Newbie Looking for Replacement OPTS Motorola Console Amp
  7. Merlyn- May AudioXpress
  8. How to clean tubes?
  9. does the 3A5 have the stones to drive a 2A3?
  10. New amp: 13DE7 SE hybrid
  11. My amp is motorboating, improve it with b+ regulator ?
  12. Can you identify these amps?
  13. Sowter SA01 - anyone used it ?
  14. Mikael‑Abdellah‑SE‑KT88 Bias & Voltage readings Help?
  15. Resistors and combinations
  16. thr light in pcl82
  17. Bogen L330 - Worth restoring?
  18. Those Magnificent Television Tubes
  19. Demagnetizing OPT?
  20. Real DIY fun hybrid testing.
  21. Extreme hum in EQ output
  22. 46 triode-strapped DHT spice model
  23. SET output impedance vs speaker impedance
  24. Help with layout of tube preamp
  25. eico HF-65
  26. Wirewound bias pot problem.
  27. Driver for Telefunken RS242 in class A2
  28. Help on my signal generator
  29. another tube fact or fallacy
  30. Gap in Transformer Lams - OCD Check
  31. how to test...
  32. chinese tube amp
  33. tube/valve pc-80
  34. GM-70 All done
  35. preamp for reciever?
  36. Designing a Tube Rectifier Circuit
  37. Bogen RP40A transformers....what to build with them?
  38. Heads Up for "El Cheapo" Builders
  39. replacing kt66 valves
  40. Help with power transformer identification
  41. 6-8x el84 Per channel
  42. To vary a signal pentode to triode in stages
  43. I have 2 choices for resistive load, need opinions.
  44. Tesla PCC88 7DJ8 dual triode - Help Needed.
  45. PP6550
  46. LT1083 interesting startup problem
  47. ECC33 Driver Stage
  48. Hiraga's Improved Concertina Phase Splitter
  49. 274B a direct replacement for 5AR4/GZ34?
  50. Help power up akai M8 amps
  51. Sonic Frontiers Power 3 Help!
  52. ImPasse Preamp now online
  53. Power supply for tube preamplifier with PCC88
  54. Don't know where to start...
  55. DIY noob
  56. 300B amp cathode bypass
  57. Amp hum with Preamp off
  58. First Project with these tubes
  59. 7189a socket rewiring
  60. Hybrid rectifiers in PSUD2
  61. Feedback / experience wanted on building the Audio note L4 Integrated EL34 PP Amp Kit
  62. About 6AS7BTL Amp
  63. Output Stage Protection Circuit
  64. Silly basic layout question - AC heaters
  65. heater voltage variation for special tubes
  66. Want to build a 807 Vixen.. Looking for help.
  67. Connecting Speakers to Yaqin 10L
  68. Gyrator Filter
  69. 6ab4 tube socket mounting
  70. Any Moto heads? Need OT advice please
  71. Did I break my tube? (new blue glow)
  72. I need help with ccs based LTP
  73. 4033L- rare triode tube.
  74. Single tube linestage schematic wanted: 8CG7
  75. Tetra Sans PS
  76. Tone controls
  77. Vintage Heathkit Electronic Switch as soundcard interface
  78. K-12M extra caps??
  79. Looking for Tube Amp Kit Recommendations
  80. high voltage after cap. change
  81. My first tube amp
  82. Recommendations for 6888 triode operating point?
  83. Mullard 12AX7 part uniformity
  84. 6n15n-EB confusion
  85. Noob Question: Phono Preamp
  86. Transformer data required P782
  87. Snubbers on Power Transformer Secondaries
  88. CCS for 6V6 PP amp
  89. screen voltage for triode strapped pentode
  90. New Driver
  91. purpose and value importance of resistor
  92. Values for Vintage Amp's & Preamp's Paragon 12(70's) & More
  93. Help with amp please.
  94. Another Discrete Current Source
  95. 834 Triode amp
  96. Determing the reason for mystery? cap in schematic.
  97. Dyna ST70 to Dual-differential EL34 triode amp project
  98. Tube Signal to Noise Ratio / Dynamic Range
  99. fluctating bias
  100. Just tried a Wire Wound pot for volume.
  101. LED's in the cathode..
  102. Dr. Arthur Loesch
  103. Counterpoint SA-220 mods
  104. Broskie P-P Bridged Output Stage
  105. Would a member fluent in technical German please have a look at this link?
  106. Damaged tube? EL84
  107. Heathkit AA-161 EL84/6BQ5 PP mono integrated amp mod
  108. vk-2100 mod question please
  109. Heater supply
  110. 6111/6n16b - linestage noise problem
  111. OPT specs
  112. Re: Tube Line gain stage with pcc88 or ecc82
  113. Knight-kit KA-55
  114. Can I delay part of a B supply this way?
  115. Tube Preamp turn on circuit
  116. SE GM-70 for 700-800 euro?
  117. filter cap markings
  118. tube buffer noise cancellation
  119. PSUD 2
  120. balancing resister for series capacitor in a power supply
  121. Yaqin MC-100b- TJ Full Music 6sn7
  122. Forgive me for I have sinned. Help with Volume Pot!
  123. Help with diagnoses for leak 20 PLEASE
  124. Suggested Circuit Changes to use EM80 in place of 6E2 Eye
  125. Fred Nachbaur SET amp: input capacitor
  126. Heathkit scu 1 and knight kn924 needed schematics
  127. Journey to the centre of a tube..
  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. Assistance needed in reconstructing a Golden Tube Audio SE-40
  204. interesting power tube comparison chart
  205. 833A and 3-500Z Circuits
  206. Pilot SA-260 amp and Fischer 400C advice
  207. Long tailed pair phase inverter issues
  208. advice on changing bridge rectifier
  209. 21st Century Maida Regulator
  210. 6CA7 UL Push Pull Amp Design
  211. Tube recommendations anyone?
  212. WE 2C51 Date codes
  213. T500-1 - any ideas?
  214. hybrid power amp and more questions
  215. Yaqin MC-100B - not as powerful as advertised, but still a good value.
  216. 6CB5 AMP BUILD.
  217. ABB France SE OPT??
  218. heater wiring
  219. Audioromy FU29 improvement and upgrades?
  220. Need VFD display filament driver
  221. Power Transformer Limitations
  222. Yaqin 100b channel imbalance
  223. Grid stoppers in class AB2 push-pull arrangenets?
  224. Glass bead inside of KT88
  225. Find tube tester!
  226. mono block amps with 2 x 833C overkill ? even possible to DIY?
  227. happiness is a box of 6550 NOS tubes
  228. Taming the 83
  229. 6550 tube bias characters
  230. Tube Amp Squeel
  231. Bias help Music Angel L$, EL84
  232. Stubborn Oscillation
  233. Moderm "high watt" resistors seem too small
  234. Thyratron based emergency switch?
  235. vT4C.com out of business....
  236. Maggie 8802 6V6
  237. Need Counterpoint SA-3 Board Photo
  238. Diodes in a Graetz Hybrid
  239. Tube Noob with a few questions
  240. KT88 Push Pull Idea... Questions
  241. Superior Instruments tv11 restore question?
  242. Superior Instruments tv11 restore question?
  243. Frequency Response of Output Tubes
  244. symptom of a dying (gain) tube
  245. Grounding in monoblock amps
  246. Seeking 6ME5 data and connection diagram
  247. 12BK5 UL tracing gone boosted triode?
  248. Difference between OPT
  249. Tweaking PP AMP Suggestions Please
  250. DC coupled Sand 'n Glass with Current Feedback

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