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  1. Ground noise and hum: why and how to maybe fix it
  2. How to measure SNR?
  3. Triode vs Pentode cathode followers
  4. Damaged tubes
  5. 2W on 8Ohm OTL amplifier?
  6. EC88 dirver PL84 push-pull,DIY with a picture tells a story.
  7. DC/DC from 12V to 240V@25mA example
  8. the small SE UL ECL 86 / EY 82
  9. 1934 RCA Radio
  10. Recommendations for wiring a Red LED as a pilot lamp
  11. Retensioning UX4 (300b) tube pin socket
  12. Looking for power transformer source - details inside
  13. High voltage delay circuit
  14. op-amp current source
  15. Conrad Johnson ART II Blow-up
  16. Help In Determining Amplifier's Output
  17. Unknown tube identification help?
  18. 6S45P HP-Amp help with tail CCS
  19. shuguang EL84 question
  20. Audioromy FU29 M828A High Pitch Squeal / Whine / Whistle
  21. Unknown ECC-83
  22. 6MN8 connected as one triode
  23. 7247 and 6GF7A in driver circuits
  24. I'm looking for a PPP with el34
  25. Output transformer measurements
  26. Volume control crackles on SET hooked to F4.
  27. EF80 push EL153, DIY with a picture tells a story.
  28. Audioromy m 828 a / 829b FU29 Bias / Balance Help
  29. The zero bias valve
  30. KT61 testing
  31. SET Stereo Amplifier
  32. Klangfilm 408a Output Transformers
  33. Too Large Grid Resistor?
  34. Sound master # 34 tube amp
  35. Echolette M40 Cap job ... now everything sucks
  36. dual coil choke
  37. looking for ML6 tubes
  38. 220V Transformer question
  39. 1 or 2 watt fire resistant metal film resistors
  40. 6GK5 SRPP
  41. Unknown Amplifier - Anyone recognise it
  42. Help me ID a tube?
  43. Triode electronics difficulties
  44. Can anyone ID this car amp trans?
  45. Multi Stage amplifier bandwidth.
  46. Chassis Question
  47. Converting Stereo SE to Parallel SE Monoblock
  48. Just got a Hickok 539B! Have questions!
  49. Can regulated B+ act like a CCS?
  50. Quad II valve matching
  51. Heater Current - per valve or per triode ?
  52. OT for 12AU7 preamp?
  53. Which James output for a Lacewood SE
  54. Help Matching RCA 5692 Tubes
  55. Yet another ECL82 se
  56. Psvane 211-TII ... Pushing them above 75W Pa
  57. Fisher X 100 A restoration questions?
  58. Brook 12A Q
  59. HT voltage for preamp circuit vs output circuit
  60. Please explain this H3 3rd harmonic cancellation
  61. Recommended speaker selector for tube amplifiers?
  62. Should I use a choke?
  63. 12DW7/7427 tube question
  64. philips 228 radiogram
  65. soft start and delay start - help please
  66. Grounding and GFCI circuits
  67. SuperTriode with BJT and MosFet - a good idea?
  68. 6AQ5/6005 12AX7 Amp
  69. Hamlin's 20-20 / Trio w45 : looking for legible schematic
  70. Dynaco PAS 3X - help with an old modification
  71. Power supply 500v
  72. Anyone use 816 mercury vapor 1/2 wave rec tube
  73. Lamm clone
  74. Zobel RC network and stability of GNF SE amplifier
  75. Screen driven 6KD6 SE
  76. Comments about regulators
  77. Rolling 6C33
  78. Crazy B+ Issue???
  79. Psvane EL34PH replica - reliability?
  80. Help designing regulated power supply
  81. Tube wiring guide line
  82. Chassis earth and ground
  83. 7868 to 7591
  84. Maximum Screen Voltage for Triode Strapped 1625 or 837
  85. AT-50 British transmitting triode
  86. Problem with power tubes
  87. A 6Y6 Push Pull amplifier
  88. Testing
  89. 6CG7 Hybrid Tube Headphone Amp
  90. Choke On The Output Of A Tube Amp
  91. 6n3p buffer?
  92. 4P1L vs 4P1S
  93. Moving from 6N16B to 6021/CV3986 in Cayin HA-3
  94. "La Luxuriante" R120 SE amplifier
  95. Tube Headphone Amp Design and Help With Inverse Pre-Distortion Circuit
  96. Looking For Some Help
  97. Audio dummy load
  98. Custom-made transformers in USA
  99. Etude - Amplifier for study
  100. Can you mix glow tubes and zeners for shunt regs?
  101. tubes4hifi - Amplifier Sound, other kits?
  102. Suggest source for inexpensive chassis for tube amp project?
  103. Reverse Tube Regulator?
  104. Leak Stereo 20 Problem
  105. Choke for 6v6 lacewood amp.
  106. Output Tube Options for Scott 399
  107. ST-35 Z565 Output Transformer Troubles?
  108. Point to Point Wiring Tube Preamp
  109. Siamese RG-6
  110. Gz34 rectifier with dc heater
  111. line preamp
  112. A bit of help with my phono preamp
  113. Aikido Cascode Preamp build
  114. Can EL34 replace KT88?
  115. Current Draw of CJ ART??
  116. Square wave overshot=worm sound?
  117. Band pass filter for tube amps
  118. Screen drive and the 6AG9
  119. Cleaning odd potentiometer
  120. Removing a Jolida 502 Balance Control
  121. "The unequal twins" ECC83 / ECC99 Triode and 6N1P / E280F pentode amps
  122. Marantz 8 blowing fuse
  123. A newbie question about 12AX7 tube
  124. Web resources
  125. Transformer Shrouding - Purpose/Effectiveness
  126. current source
  127. KT88 Schematic - please help
  128. 105C to 85C Capacitors in Cheap Chinese Preamp
  129. Need help with plate CCS in 6EM7
  130. Need help on replacing Cap on Marantz 8
  131. Transformer for 12ax7 B+ calculation
  132. First amp build, advice and thoughts encouraged!!
  133. Proposed E-Linear PP 6L6GB w/ EL83 LTP - Critique?
  134. Luxman CL36, schematic
  135. Help with input impedance
  136. phono sp16
  137. Looking for a 20W amp schematics
  138. Ruggedized tube construction?
  139. Quicksilver full function preamplifier
  140. Another variants of using PCB from Ebay
  141. Valves very close each other...
  142. HF valve amp?
  143. Eico ST70 construction manual...
  144. Audio Research $30 FET!
  145. value in humour
  146. "rejuvenate" oxide cathode
  147. el84 se amp layout
  148. the grand return. 3d21A triode PP
  149. How did receiving valve manufacture compare to the LHC ...
  150. Classi RIAA preamp questions
  151. Max input voltage with negative feedback in place?
  152. Is there a 9-pin mini equivalent of 6AU6?
  153. Which DHT tube, mu>30 driver duty
  154. LTP and H3 distortion
  155. Schematics for Bendix 6384
  156. Has anybody compared distortion profiles of their amp designs?
  157. Dynacord transformer sparks flying
  158. Why this exists?
  159. Help with strange valve project:)
  160. help with these transformers please
  161. Bias a heater supply with humdinger?
  162. Question About Isolating Grounds
  163. How close is close enough for setting bias?
  164. Vitamin Q or Auricaps for coupling...any opinions?
  165. High current from EL84 measured on tubetester
  166. Power supply design for my preamp
  167. How do I get USB input into a tube amp?
  168. Janus Shunt Regulator / Aikido Octal build
  169. 6SN7 or 12AU7 Tube preamp for Gainclone
  170. E-Linear, P-P pentode application
  171. 6n6p preamp. Does it look ok?
  172. www.grippeaz.com
  173. Capacitance value help
  174. 6C33 SVETLANA in 1979??
  175. FYI: MCM 555-7125 Transformer Info
  176. Anyone use 39/44 for audio?
  177. I think its about time for me to design my first Transformer tube amp..
  178. Q: EL84 PP - Bias switch, PS regulation
  179. Balanced to unbalanced converter solution with only one dual triode?
  180. ECL85 G1+G2 Driven Amp Concept - Worth Pursuing?
  181. What is this called? "Triode with active load"?
  182. Type 50 triode amp
  183. Triode strapped C3G
  184. Newbie looking for first tube project. Maggie 9308 or like suggestions?
  185. Poindexter's Musical Machine:Tube Power Supply Schematic
  186. SE EL34 cathode help ?
  187. How to add "Vu-Meters and "Subwoofer Out" to a tube amp...
  188. Audio Research D90... a HOT, buzzing amplifier
  189. Lundahl LL1670 grid choke -- One or two needed for push-pull?
  190. At this stage of my experience almost too afraid to ask
  191. Help with EM7 circuit
  192. Ceramic or plastic noval socket
  193. Need connection info for Thordarson 22S86
  194. Harmon Kardon A500 Redux
  195. Schematic for 2A3/300B SET OTL amp
  196. Bias circuit for fixed bias
  197. Ultrapath with cathode bypass cap: which value of C is correct?
  198. Volume Control Tube Amp / Graaf Graafiti WFB one
  199. Pultec EGP-2 control pannel
  200. Emission values?
  201. Capacitor Upgrade for S5 Electronics (16LS)
  202. 'nipple' in waveform - What is it?
  203. High impedance speaker for SET OTL amps.
  204. Uneven output from LL1677
  205. Ugh. Need help with hum
  206. 6H16B plate follower output stage
  207. Tube preamp 30 gain design with 12ax7
  208. Operating points for 6n2p
  209. Sensing current in high voltage DHT circuits.
  210. Have you tested if two coupling capacitors in parallel are better than one sonically?
  211. DHT filament circuits - best wirewound resistors?
  212. Dual Pentode as two seperate Pentodes.
  213. Double "C" core OPT question
  214. EL34 pentode to triode feedback
  215. Chinese 7308?
  216. DC coupled circuits
  217. Need a complete amp kit for newbie
  218. Making a tube amp
  219. Tube amp diode question
  220. Michaelson Chronos
  221. Preamp question
  222. 6SJ7 and 6SC7 not on roll chart
  223. Graaf GM20 6C33
  224. Does Ultra-Linear SE reduce harmonic distortion?
  225. How to use a 3 prong plug with a Dynaco MkIII?
  226. 6e5-6e6 tube-operating point-absolute maximum rating
  227. LIFePO4 battery cathode bias
  228. Audible Illusions Modulus 3A CD input resistor values
  229. Insulation for component leads in point to point wiring
  230. Advices on first tube amp
  231. 300B Tube Shootout
  232. Unison reasearch Mystery One
  233. 4P10C or 4Π10C tube, any member familiar with?
  234. Largest decoupling cap (DC block on signal path)
  235. Control Grid Feedback (as opposed to Cathode FB) and Miller Capacitance
  236. 211 / 845 ccs?
  237. Eimac 35T any good for an amplifier?
  238. What speaker impedance for a 5 ohm amplifier
  239. Almarro A318B SET Amplifier Simple Modifications For Improved Performance?
  240. Hammond interstage
  241. Bias Arrangement
  242. question about connecting my tube amp to a receiver
  243. Pentode screen bypass capacitor
  244. MINGDA MC845 AA schematics
  245. Faulty Output Transformer
  246. The makings of a nice SEP amp from an audio oscillator?
  247. Audio pot with tap
  248. tube amp and jbl crossover connection
  249. SE EL84 high screen and plate
  250. Marantz 7 line stage with DAC

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