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  1. Your opinions please
  2. design advise
  3. Interpolation Oscillator
  4. audio note oto
  5. A small resonant HV converter: Q-Conv
  6. Iv got a 100w OPT That needs a circuit
  7. Powerful tube amp / unmatched tubes in parallel
  8. Need help: I have 807s and the guts from a HK AA-100
  9. SE EL34 and speakers
  10. 6AK10 LTP with CCS question
  11. Is a heater voltage of 6.7 cause for concern?
  12. Tube guards/cage for Elekit TU-8200
  13. ming da mc 845 aa modification
  14. How good can this headphone amp/pre amp be?
  15. Zero Bias Solution?
  16. Cathode Degeneration with CCS plate load- My Mistake
  17. Pilot 240 with too much bass-- circuit modification needed?
  18. EL34 DIY "centre-tapped" tube ??
  19. Advice for Super Cheap & Simple 829b based amp from spare parts
  20. Infineon IPA50R140CP N-channel mosfet
  21. Borberly Op amp 4 Tube Mosfet hybrid
  22. Splitting Power Supply Choke Question
  23. Toroidal PT as OPT in big power application?
  24. Inrush limiter question
  25. Counterpoint AS-5.1 Tube Type Question
  26. OPT connections
  27. Help teach a CS guy to test a tube amp!
  28. Now THIS is an output transformer
  29. Gas rectifier vs vacuum rectifier
  30. What value for the bias resistor of a SE 6550?
  31. ELL80 tube-Ultralinear mode???
  32. Russian "6L6" ID
  33. Tube amp for a car lol
  34. S5 Electronics Upgrade
  35. Best Tube for SPUD Amp
  36. Zenith 7b31 EL84 Tube Amp Low Volume
  37. Heater cathode elevation
  38. 6K5GT & EL36 AMP
  39. Grid stopper by ECC83
  40. 6L6 Without Screen Drive?
  41. Fusion Postmodernism and tube amps ---- 6SN7 + 26 45
  42. Mullard V.T.52 Push-Pull Tube AMP.
  43. Amp for Magneplaner 1,6/R
  44. Car tube amp- looking for advice
  45. Direct replacement for 5Z3PA and 5Z3P Rectifier
  46. 83 Rectifier
  47. Ground noise and hum: why and how to maybe fix it
  48. How to measure SNR?
  49. Triode vs Pentode cathode followers
  50. Damaged tubes
  51. 2W on 8Ohm OTL amplifier?
  52. EC88 dirver PL84 push-pull,DIY with a picture tells a story.
  53. DC/DC from 12V to 240V@25mA example
  54. the small SE UL ECL 86 / EY 82
  55. 1934 RCA Radio
  56. Recommendations for wiring a Red LED as a pilot lamp
  57. Retensioning UX4 (300b) tube pin socket
  58. Looking for power transformer source - details inside
  59. High voltage delay circuit
  60. op-amp current source
  61. Conrad Johnson ART II Blow-up
  62. Help In Determining Amplifier's Output
  63. Unknown tube identification help?
  64. 6S45P HP-Amp help with tail CCS
  65. shuguang EL84 question
  66. Audioromy FU29 M828A High Pitch Squeal / Whine / Whistle
  67. Unknown ECC-83
  68. 6MN8 connected as one triode
  69. 7247 and 6GF7A in driver circuits
  70. I'm looking for a PPP with el34
  71. Output transformer measurements
  72. Volume control crackles on SET hooked to F4.
  73. EF80 push EL153, DIY with a picture tells a story.
  74. Audioromy M828A/829B FU29 Bias/Balance Help
  75. The zero bias valve
  76. KT61 testing
  77. SET Stereo Amplifier
  78. Klangfilm 408a Output Transformers
  79. Too Large Grid Resistor?
  80. Sound master # 34 tube amp
  81. dual coil choke
  82. looking for ML6 tubes
  83. 220V Transformer question
  84. 6GK5 SRPP
  85. Unknown Amplifier - Anyone recognise it
  86. Help me ID a tube?
  87. Triode electronics difficulties
  88. Can anyone ID this car amp trans?
  89. Multi Stage amplifier bandwidth.
  90. Chassis Question
  91. Converting Stereo SE to Parallel SE Monoblock
  92. Can regulated B+ act like a CCS?
  93. Quad II valve matching
  94. Heater Current - per valve or per triode ?
  95. OT for 12AU7 preamp?
  96. Which James output for a Lacewood SE
  97. Help Matching RCA 5692 Tubes
  98. Yet another ECL82 se
  99. Psvane 211-TII ... Pushing them above 75W Pa
  100. Fisher X 100 A restoration questions?
  101. Brook 12A Q
  102. HT voltage for preamp circuit vs output circuit
  103. Please explain this H3 3rd harmonic cancellation
  104. Recommended speaker selector for tube amplifiers?
  105. Should I use a choke?
  106. 12DW7/7427 tube question
  107. philips 228 radiogram
  108. soft start and delay start - help please
  109. Grounding and GFCI circuits
  110. SuperTriode with BJT and MosFet - a good idea?
  111. 6AQ5/6005 12AX7 Amp
  112. Hamlin's 20-20 / Trio w45 : looking for legible schematic
  113. Dynaco PAS 3X - help with an old modification
  114. Power supply 500v
  115. Anyone use 816 mercury vapor 1/2 wave rec tube
  116. Lamm clone
  117. Zobel RC network and stability of GNF SE amplifier
  118. Screen driven 6KD6 SE
  119. Comments about regulators
  120. Rolling 6C33
  121. Crazy B+ Issue???
  122. Psvane EL34PH replica - reliability?
  123. Help designing regulated power supply
  124. Tube wiring guide line
  125. Chassis earth and ground
  126. 7868 to 7591
  127. Maximum Screen Voltage for Triode Strapped 1625 or 837
  128. AT-50 British transmitting triode
  129. Problem with power tubes
  130. A 6Y6 Push Pull amplifier
  131. Testing
  132. 6CG7 Hybrid Tube Headphone Amp
  133. Choke On The Output Of A Tube Amp
  134. 6n3p buffer?
  135. 4P1L vs 4P1S
  136. Moving from 6N16B to 6021/CV3986 in Cayin HA-3
  137. "La Luxuriante" R120 SE amplifier
  138. Tube Headphone Amp Design and Help With Inverse Pre-Distortion Circuit
  139. Looking For Some Help
  140. Audio dummy load
  141. Custom-made transformers in USA
  142. Etude - Amplifier for study
  143. Can you mix glow tubes and zeners for shunt regs?
  144. tubes4hifi - Amplifier Sound, other kits?
  145. Suggest source for inexpensive chassis for tube amp project?
  146. Reverse Tube Regulator?
  147. Leak Stereo 20 Problem
  148. Choke for 6v6 lacewood amp.
  149. Output Tube Options for Scott 399
  150. ST-35 Z565 Output Transformer Troubles?
  151. Point to Point Wiring Tube Preamp
  152. Siamese RG-6
  153. Gz34 rectifier with dc heater
  154. line preamp
  155. A bit of help with my phono preamp
  156. Aikido Cascode Preamp build
  157. Can EL34 replace KT88?
  158. Current Draw of CJ ART??
  159. Square wave overshot=worm sound?
  160. Band pass filter for tube amps
  161. Screen drive and the 6AG9
  162. Cleaning odd potentiometer
  163. Removing a Jolida 502 Balance Control
  164. "The unequal twins" ECC83 / ECC99 Triode and 6N1P / E280F pentode amps
  165. Marantz 8 blowing fuse
  166. A newbie question about 12AX7 tube
  167. Web resources
  168. Transformer Shrouding - Purpose/Effectiveness
  169. current source
  170. KT88 Schematic - please help
  171. 105C to 85C Capacitors in Cheap Chinese Preamp
  172. Need help with plate CCS in 6EM7
  173. Need help on replacing Cap on Marantz 8
  174. Transformer for 12ax7 B+ calculation
  175. First amp build, advice and thoughts encouraged!!
  176. Proposed E-Linear PP 6L6GB w/ EL83 LTP - Critique?
  177. Luxman CL36, schematic
  178. Help with input impedance
  179. Looking for a 20W amp schematics
  180. Ruggedized tube construction?
  181. Quicksilver full function preamplifier
  182. Another variants of using PCB from Ebay
  183. Valves very close each other...
  184. HF valve amp?
  185. Eico ST70 construction manual...
  186. value in humour
  187. "rejuvenate" oxide cathode
  188. el84 se amp layout
  189. the grand return. 3d21A triode PP
  190. How did receiving valve manufacture compare to the LHC ...
  191. Classi RIAA preamp questions
  192. Max input voltage with negative feedback in place?
  193. Is there a 9-pin mini equivalent of 6AU6?
  194. Which DHT tube, mu>30 driver duty
  195. LTP and H3 distortion
  196. Schematics for Bendix 6384
  197. Has anybody compared distortion profiles of their amp designs?
  198. Dynacord transformer sparks flying
  199. Why this exists?
  200. Help with strange valve project:)
  201. help with these transformers please
  202. Bias a heater supply with humdinger?
  203. Question About Isolating Grounds
  204. How close is close enough for setting bias?
  205. Vitamin Q or Auricaps for coupling...any opinions?
  206. High current from EL84 measured on tubetester
  207. Power supply design for my preamp
  208. How do I get USB input into a tube amp?
  209. Janus Shunt Regulator / Aikido Octal build
  210. 6SN7 or 12AU7 Tube preamp for Gainclone
  211. E-Linear, P-P pentode application
  212. 6n6p preamp. Does it look ok?
  213. www.grippeaz.com
  214. Capacitance value help
  215. 6C33 SVETLANA in 1979??
  216. FYI: MCM 555-7125 Transformer Info
  217. Anyone use 39/44 for audio?
  218. I think its about time for me to design my first Transformer tube amp..
  219. Q: EL84 PP - Bias switch, PS regulation
  220. Balanced to unbalanced converter solution with only one dual triode?
  221. ECL85 G1+G2 Driven Amp Concept - Worth Pursuing?
  222. What is this called? "Triode with active load"?
  223. Type 50 triode amp
  224. Triode strapped C3G
  225. Newbie looking for first tube project. Maggie 9308 or like suggestions?
  226. Poindexter's Musical Machine:Tube Power Supply Schematic
  227. SE EL34 cathode help ?
  228. How to add "Vu-Meters and "Subwoofer Out" to a tube amp...
  229. Audio Research D90... a HOT, buzzing amplifier
  230. Lundahl LL1670 grid choke -- One or two needed for push-pull?
  231. At this stage of my experience almost too afraid to ask
  232. Help with EM7 circuit
  233. Ceramic or plastic noval socket
  234. Need connection info for Thordarson 22S86
  235. Harmon Kardon A500 Redux
  236. Schematic for 2A3/300B SET OTL amp
  237. Bias circuit for fixed bias
  238. Ultrapath with cathode bypass cap: which value of C is correct?
  239. Volume Control Tube Amp / Graaf Graafiti WFB one
  240. Pultec EGP-2 control pannel
  241. Emission values?
  242. Capacitor Upgrade for S5 Electronics (16LS)
  243. 'nipple' in waveform - What is it?
  244. High impedance speaker for SET OTL amps.
  245. Uneven output from LL1677
  246. Ugh. Need help with hum
  247. 6H16B plate follower output stage
  248. Tube preamp 30 gain design with 12ax7
  249. Operating points for 6n2p
  250. Have you tested if two coupling capacitors in parallel are better than one sonically?

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