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  1. 5693 issue
  2. Hum SOLVED!!!!
  3. Garage System Control/Preamp idea
  4. Aikido Octal line stage kit info needed
  5. Phonola suitcase player...now, with hum!
  6. My latests (well ... first) RIAA preamp
  7. 12at7 one side drawers 10% more current
  8. Upgrade output transfomers, EL34 single-ended
  9. cleaning tubes / valves
  10. a simple (I think) Baxandall question
  11. Paoli Model 60M help
  12. Should something be done about these traces?
  13. 300(may)B(e) - Recs & Advice
  14. LNF in gain stage or CF?
  15. KT77 at 790 V
  16. Newb question about tube socket placement
  17. my first tube amp project
  18. Unusual Schematic help
  19. 12AX7 vs 12AT7 vs 12AU7
  20. 6SN7 Distortion Canceling in Amp
  21. D-115 w/ weak channel
  22. MOSFET Follower Choices
  23. Sanity check my unlabeled transformer guesstimates? Fisher X-200 power trafo
  24. Mystery Tube Time
  25. PSU simulation help
  26. Vacuum tubes and wire wrap
  27. LTP phase splitter as output stage?
  28. Swap 6B4G for 6SL7 SRPP ?
  29. Need Fuse Values for 6922 Tube Premp, 6.3v & B+ Fuse Value
  30. 12AX7 tone control with low B+ voltage
  31. Cathodefollower and strange behaviour with lowering of anode voltage.
  32. Early Audio Research Dual 100 Schematic?
  33. current drive
  34. Bench Supply
  35. 6X5 GT Hybrid rectifier
  36. small shrouded PP OPT choices ?
  37. Single triode instead of double triode?
  38. Low noise valve tube circuit ideas for cassette deck
  39. Found a box of various 9 pin tubes....
  40. 12AU7 internally matched triodes
  41. Homemade tube socket adaptor
  42. Who's mark was on this obvious 6n23p?
  43. Thoughts on amp mods
  44. Just a quick thanks to you guys
  45. Low voltage tube line preamp
  46. What the difference between 6H7C & 6H8C tubes
  47. Headphone amp OTL
  48. Recommend design for low cost DIY valve amp
  49. need help with short
  50. Simple 1-device gyrators
  51. Need assist - Melos 110 Preamp
  52. Bad capacitor?
  53. Does someone has info about this tubes ?
  54. 2c26a
  55. Help identifying vintage tube amp connector
  56. What make is this E88CC ?
  57. Valve amp - vanishing bass
  58. 5Z3P 6N9P EL34B SE amplifier
  59. Wrapping my head around cathode followers. Does this explanation make sense?
  60. HK A500 rebuild
  61. LS7B Marantz 7 Clone PreAmp
  62. SS to drive 300b
  63. is the 12ax7 ever used on television sets?
  64. What topology was this old RCA power transformer designed for?
  65. BOM of Audio Research SP-11 MkII and D-115 MkII
  66. ECC88/6DJ8 at higher Va
  67. Valve headphone amp humming through headphones
  68. Merlin's new hi-fi valve preamp book is released
  69. Screen Drive 6BQ6GT Amp - Feasibility Study
  70. Harmon Kardon A50K project
  71. Reading high V through resistor/cap casings
  72. Troubleshooting magnavox 9302-00
  73. Vintage 1990's Audio Note 2k5 output transformer wiring color code
  74. Splitting the audio band into two transformers
  75. 21LG6/A P-P for 50+ watts?
  76. Anyone use an IEC line filter plug??
  77. pre Line 2 end Line 3
  78. NEW D3a equivalent on marked?
  79. Anyone tried Plitron transformers?
  80. Summing channels;Why? JE EL34
  81. TAJ's Harman Kardon Citation V rebuild thread
  82. Screened/shielded cables in chassis
  83. Cascode question re shunt to lower tube
  84. LED biasing in preamp - cap in parallel required?
  85. Can you identify these tube amplifiers? 4x807 & mercury vapor rectifiers
  86. Amperex BB ECC82 - Real or Fake?
  87. Max screen grid voltages in datasheets
  88. Tube rectifiers
  89. VT-25/10Y tubes
  90. Does anyone have the schematic for Transcendant Sound Mini Beast?
  91. Schematic help please
  92. Faulty rectifier valve possibly damaged my amplifier - help
  93. 6J1 tube buffer circuit diagram
  94. Filament transformer question
  95. Grundig 9060 output transformer identifying
  96. 6J1 biasing inconsistencies with datasheet
  97. Separate transformer for heaters. How to reference this to ground?
  98. 300B alternatives
  99. Stereo to Mono transformer based 'hybrid/bridging mixer'
  100. LK-48 over voltage
  101. Aikido all in one
  102. Bitsa Amp project
  103. Search for thread/article about phono preamp design
  104. Fusing valve amps
  105. AIKIDO line stage
  106. Cossor 61SPT - any experience?
  107. 6BG6GA PP, -bias, Amp built but couple problems
  108. GE 6sn7 made in Italy
  109. First SE Amp Build
  110. HV soft start
  111. Setup Question (do I really need the gain from a preamp)
  112. Your opinions please
  113. design advise
  114. Interpolation Oscillator
  115. audio note oto
  116. A small resonant HV converter: Q-Conv
  117. Iv got a 100w OPT That needs a circuit
  118. Powerful tube amp / unmatched tubes in parallel
  119. Need help: I have 807s and the guts from a HK AA-100
  120. SE EL34 and speakers
  121. 6AK10 LTP with CCS question
  122. Is a heater voltage of 6.7 cause for concern?
  123. Tube guards/cage for Elekit TU-8200
  124. ming da mc 845 aa modification
  125. How good can this headphone amp/pre amp be?
  126. Zero Bias Solution?
  127. Cathode Degeneration with CCS plate load- My Mistake
  128. Pilot 240 with too much bass-- circuit modification needed?
  129. EL34 DIY "centre-tapped" tube ??
  130. Advice for Super Cheap & Simple 829b based amp from spare parts
  131. Infineon IPA50R140CP N-channel mosfet
  132. Borberly Op amp 4 Tube Mosfet hybrid
  133. Splitting Power Supply Choke Question
  134. Toroidal PT as OPT in big power application?
  135. Inrush limiter question
  136. Counterpoint AS-5.1 Tube Type Question
  137. OPT connections
  138. Help teach a CS guy to test a tube amp!
  139. Now THIS is an output transformer
  140. Gas rectifier vs vacuum rectifier
  141. What value for the bias resistor of a SE 6550?
  142. ELL80 tube-Ultralinear mode???
  143. Russian "6L6" ID
  144. Tube amp for a car lol
  145. S5 Electronics Upgrade
  146. Best Tube for SPUD Amp
  147. Zenith 7b31 EL84 Tube Amp Low Volume
  148. Heater cathode elevation
  149. 6K5GT & EL36 AMP
  150. Grid stopper by ECC83
  151. 6L6 Without Screen Drive?
  152. Fusion Postmodernism and tube amps ---- 6SN7 + 26 45
  153. Mullard V.T.52 Push-Pull Tube AMP.
  154. Amp for Magneplaner 1,6/R
  155. Car tube amp- looking for advice
  156. Direct replacement for 5Z3PA and 5Z3P Rectifier
  157. 83 Rectifier
  158. Ground noise and hum: why and how to maybe fix it
  159. How to measure SNR?
  160. Triode vs Pentode cathode followers
  161. Damaged tubes
  162. 2W on 8Ohm OTL amplifier?
  163. EC88 dirver PL84 push-pull,DIY with a picture tells a story.
  164. DC/DC from 12V to 240V@25mA example
  165. the small SE UL ECL 86 / EY 82
  166. 1934 RCA Radio
  167. Recommendations for wiring a Red LED as a pilot lamp
  168. Retensioning UX4 (300b) tube pin socket
  169. Looking for power transformer source - details inside
  170. High voltage delay circuit
  171. op-amp current source
  172. Conrad Johnson ART II Blow-up
  173. Help In Determining Amplifier's Output
  174. Unknown tube identification help?
  175. 6S45P HP-Amp help with tail CCS
  176. shuguang EL84 question
  177. Audioromy FU29 M828A High Pitch Squeal / Whine / Whistle
  178. Unknown ECC-83
  179. 6MN8 connected as one triode
  180. 7247 and 6GF7A in driver circuits
  181. I'm looking for a PPP with el34
  182. Output transformer measurements
  183. Volume control crackles on SET hooked to F4.
  184. EF80 push EL153, DIY with a picture tells a story.
  185. Audioromy M828A/829B FU29 Bias/Balance Help
  186. The zero bias valve
  187. KT61 testing
  188. SET Stereo Amplifier
  189. Klangfilm 408a Output Transformers
  190. Too Large Grid Resistor?
  191. Sound master # 34 tube amp
  192. dual coil choke
  193. looking for ML6 tubes
  194. 220V Transformer question
  195. 6GK5 SRPP
  196. Unknown Amplifier - Anyone recognise it
  197. Help me ID a tube?
  198. Triode electronics difficulties
  199. Can anyone ID this car amp trans?
  200. Multi Stage amplifier bandwidth.
  201. Chassis Question
  202. Converting Stereo SE to Parallel SE Monoblock
  203. Can regulated B+ act like a CCS?
  204. Quad II valve matching
  205. Heater Current - per valve or per triode ?
  206. OT for 12AU7 preamp?
  207. Which James output for a Lacewood SE
  208. Help Matching RCA 5692 Tubes
  209. Yet another ECL82 se
  210. Psvane 211-TII ... Pushing them above 75W Pa
  211. Fisher X 100 A restoration questions?
  212. Brook 12A Q
  213. HT voltage for preamp circuit vs output circuit
  214. Please explain this H3 3rd harmonic cancellation
  215. Recommended speaker selector for tube amplifiers?
  216. Should I use a choke?
  217. 12DW7/7427 tube question
  218. philips 228 radiogram
  219. soft start and delay start - help please
  220. Grounding and GFCI circuits
  221. SuperTriode with BJT and MosFet - a good idea?
  222. 6AQ5/6005 12AX7 Amp
  223. Hamlin's 20-20 / Trio w45 : looking for legible schematic
  224. Dynaco PAS 3X - help with an old modification
  225. Power supply 500v
  226. Anyone use 816 mercury vapor 1/2 wave rec tube
  227. Lamm clone
  228. Zobel RC network and stability of GNF SE amplifier
  229. Screen driven 6KD6 SE
  230. Comments about regulators
  231. Rolling 6C33
  232. Crazy B+ Issue???
  233. Psvane EL34PH replica - reliability?
  234. Help designing regulated power supply
  235. Tube wiring guide line
  236. Chassis earth and ground
  237. 7868 to 7591
  238. Maximum Screen Voltage for Triode Strapped 1625 or 837
  239. AT-50 British transmitting triode
  240. Problem with power tubes
  241. A 6Y6 Push Pull amplifier
  242. Testing
  243. 6CG7 Hybrid Tube Headphone Amp
  244. Choke On The Output Of A Tube Amp
  245. 6n3p buffer?
  246. 4P1L vs 4P1S
  247. Moving from 6N16B to 6021/CV3986 in Cayin HA-3
  248. "La Luxuriante" R120 SE amplifier
  249. Tube Headphone Amp Design and Help With Inverse Pre-Distortion Circuit
  250. Looking For Some Help

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