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  1. Merlin's new hi-fi valve preamp book is released
  2. Screen Drive 6BQ6GT Amp - Feasibility Study
  3. Harmon Kardon A50K project
  4. Reading high V through resistor/cap casings
  5. Troubleshooting magnavox 9302-00
  6. How Safe are Ceramic Top Caps?
  7. Vintage 1990's Audio Note 2k5 output transformer wiring color code
  8. Splitting the audio band into two transformers
  9. 21LG6/A P-P for 50+ watts?
  10. Anyone use an IEC line filter plug??
  11. pre Line 2 end Line 3
  12. NEW D3a equivalent on marked?
  13. Anyone tried Plitron transformers?
  14. Summing channels;Why? JE EL34
  15. TAJ's Harman Kardon Citation V rebuild thread
  16. Screened/shielded cables in chassis
  17. Cascode question re shunt to lower tube
  18. LED biasing in preamp - cap in parallel required?
  19. Can you identify these tube amplifiers? 4x807 & mercury vapor rectifiers
  20. Amperex BB ECC82 - Real or Fake?
  21. Max screen grid voltages in datasheets
  22. Tube rectifiers
  23. VT-25/10Y tubes
  24. Does anyone have the schematic for Transcendant Sound Mini Beast?
  25. Schematic help please
  26. Faulty rectifier valve possibly damaged my amplifier - help
  27. 6J1 tube buffer circuit diagram
  28. Filament transformer question
  29. Grundig 9060 output transformer identifying
  30. 6J1 biasing inconsistencies with datasheet
  31. Separate transformer for heaters. How to reference this to ground?
  32. 300B alternatives
  33. Stereo to Mono transformer based 'hybrid/bridging mixer'
  34. LK-48 over voltage
  35. Aikido all in one
  36. Bitsa Amp project
  37. Search for thread/article about phono preamp design
  38. Fusing valve amps
  39. AIKIDO line stage
  40. Cossor 61SPT - any experience?
  41. 6BG6GA PP, -bias, Amp built but couple problems
  42. GE 6sn7 made in Italy
  43. First SE Amp Build
  44. HV soft start
  45. Setup Question (do I really need the gain from a preamp)
  46. yuor opinions please
  47. design advise
  48. Interpolation Oscillator
  49. audio note oto
  50. A small resonant HV converter: Q-Conv
  51. Iv got a 100w OPT That needs a circuit
  52. Powerful tube amp / unmatched tubes in parallel
  53. Need help: I have 807s and the guts from a HK AA-100
  54. SE EL34 and speakers
  55. 6AK10 LTP with CCS question
  56. Is a heater voltage of 6.7 cause for concern?
  57. Tube guards/cage for Elekit TU-8200
  58. ming da mc 845 aa modification
  59. How good can this headphone amp/pre amp be?
  60. Zero Bias Solution?
  61. Cathode Degeneration with CCS plate load- My Mistake
  62. Pilot 240 with too much bass-- circuit modification needed?
  63. EL34 DIY "centre-tapped" tube ??
  64. Advice for Super Cheap & Simple 829b based amp from spare parts
  65. Infineon IPA50R140CP N-channel mosfet
  66. Borberly Op amp 4 Tube Mosfet hybrid
  67. Splitting Power Supply Choke Question
  68. Toroidal PT as OPT in big power application?
  69. Inrush limiter question
  70. Counterpoint AS-5.1 Tube Type Question
  71. OPT connections
  72. Help teach a CS guy to test a tube amp!
  73. Now THIS is an output transformer
  74. Gas rectifier vs vacuum rectifier
  75. What value for the bias resistor of a SE 6550?
  76. ELL80 tube-Ultralinear mode???
  77. Russian "6L6" ID
  78. Tube amp for a car lol
  79. S5 Electronics Upgrade
  80. Best Tube for SPUD Amp
  81. Zenith 7b31 EL84 Tube Amp Low Volume
  82. Heater cathode elevation
  83. 6K5GT & EL36 AMP
  84. Grid stopper by ECC83
  85. 6L6 Without Screen Drive?
  86. Fusion Postmodernism and tube amps ---- 6SN7 + 26 45
  87. Mullard V.T.52 Push-Pull Tube AMP.
  88. Amp for Magneplaner 1,6/R
  89. Car tube amp- looking for advice
  90. Direct replacement for 5Z3PA and 5Z3P Rectifier
  91. 83 Rectifier
  92. Ground noise and hum: why and how to maybe fix it
  93. How to measure SNR?
  94. Triode vs Pentode cathode followers
  95. Damaged tubes
  96. 2W on 8Ohm OTL amplifier?
  97. EC88 dirver PL84 push-pull,DIY with a picture tells a story.
  98. DC/DC from 12V to 240V@25mA example
  99. the small SE UL ECL 86 / EY 82
  100. 1934 RCA Radio
  101. Recommendations for wiring a Red LED as a pilot lamp
  102. Retensioning UX4 (300b) tube pin socket
  103. Looking for power transformer source - details inside
  104. High voltage delay circuit
  105. op-amp current source
  106. Conrad Johnson ART II Blow-up
  107. Help In Determining Amplifier's Output
  108. Unknown tube identification help?
  109. 6S45P HP-Amp help with tail CCS
  110. shuguang EL84 question
  111. Audioromy FU29 M828A High Pitch Squeal / Whine / Whistle
  112. Unknown ECC-83
  113. 6MN8 connected as one triode
  114. 7247 and 6GF7A in driver circuits
  115. I'm looking for a PPP with el34
  116. Output transformer measurements
  117. Volume control crackles on SET hooked to F4.
  118. EF80 push EL153, DIY with a picture tells a story.
  119. Audioromy m 828 a / 829b FU29 Bias / Balance Help
  120. The zero bias valve
  121. KT61 testing
  122. SET Stereo Amplifier
  123. Klangfilm 408a Output Transformers
  124. Too Large Grid Resistor?
  125. Sound master # 34 tube amp
  126. Echolette M40 Cap job ... now everything sucks
  127. dual coil choke
  128. looking for ML6 tubes
  129. 220V Transformer question
  130. 1 or 2 watt fire resistant metal film resistors
  131. 6GK5 SRPP
  132. Unknown Amplifier - Anyone recognise it
  133. Help me ID a tube?
  134. Triode electronics difficulties
  135. Can anyone ID this car amp trans?
  136. Multi Stage amplifier bandwidth.
  137. Chassis Question
  138. Converting Stereo SE to Parallel SE Monoblock
  139. Just got a Hickok 539B! Have questions!
  140. Can regulated B+ act like a CCS?
  141. Quad II valve matching
  142. Heater Current - per valve or per triode ?
  143. OT for 12AU7 preamp?
  144. Which James output for a Lacewood SE
  145. Help Matching RCA 5692 Tubes
  146. Yet another ECL82 se
  147. Psvane 211-TII ... Pushing them above 75W Pa
  148. Fisher X 100 A restoration questions?
  149. Brook 12A Q
  150. HT voltage for preamp circuit vs output circuit
  151. Please explain this H3 3rd harmonic cancellation
  152. Recommended speaker selector for tube amplifiers?
  153. Those Magnificent Television Tubes
  154. Should I use a choke?
  155. 12DW7/7427 tube question
  156. philips 228 radiogram
  157. soft start and delay start - help please
  158. Grounding and GFCI circuits
  159. SuperTriode with BJT and MosFet - a good idea?
  160. 6AQ5/6005 12AX7 Amp
  161. Hamlin's 20-20 / Trio w45 : looking for legible schematic
  162. Dynaco PAS 3X - help with an old modification
  163. Power supply 500v
  164. Anyone use 816 mercury vapor 1/2 wave rec tube
  165. Lamm clone
  166. Zobel RC network and stability of GNF SE amplifier
  167. Screen driven 6KD6 SE
  168. Comments about regulators
  169. Rolling 6C33
  170. Crazy B+ Issue???
  171. Psvane EL34PH replica - reliability?
  172. Help designing regulated power supply
  173. Tube wiring guide line
  174. Chassis earth and ground
  175. 7868 to 7591
  176. Maximum Screen Voltage for Triode Strapped 1625 or 837
  177. AT-50 British transmitting triode
  178. Problem with power tubes
  179. A 6Y6 Push Pull amplifier
  180. Testing
  181. 6CG7 Hybrid Tube Headphone Amp
  182. Choke On The Output Of A Tube Amp
  183. 6n3p buffer?
  184. 4P1L vs 4P1S
  185. Moving from 6N16B to 6021/CV3986 in Cayin HA-3
  186. "La Luxuriante" R120 SE amplifier
  187. Tube Headphone Amp Design and Help With Inverse Pre-Distortion Circuit
  188. Looking For Some Help
  189. Audio dummy load
  190. Custom-made transformers in USA
  191. Etude - Amplifier for study
  192. Can you mix glow tubes and zeners for shunt regs?
  193. tubes4hifi - Amplifier Sound, other kits?
  194. Suggest source for inexpensive chassis for tube amp project?
  195. Reverse Tube Regulator?
  196. Leak Stereo 20 Problem
  197. Choke for 6v6 lacewood amp.
  198. Output Tube Options for Scott 399
  199. ST-35 Z565 Output Transformer Troubles?
  200. Point to Point Wiring Tube Preamp
  201. Siamese RG-6
  202. Gz34 rectifier with dc heater
  203. line preamp
  204. A bit of help with my phono preamp
  205. Aikido Cascode Preamp build
  206. Can EL34 replace KT88?
  207. Current Draw of CJ ART??
  208. Square wave overshot=worm sound?
  209. Band pass filter for tube amps
  210. Screen drive and the 6AG9
  211. Cleaning odd potentiometer
  212. Removing a Jolida 502 Balance Control
  213. "The unequal twins" ECC83 / ECC99 Triode and 6N1P / E280F pentode amps
  214. Marantz 8 blowing fuse
  215. A newbie question about 12AX7 tube
  216. Web resources
  217. Transformer Shrouding - Purpose/Effectiveness
  218. current source
  219. KT88 Schematic - please help
  220. RESISTORS
  221. 105C to 85C Capacitors in Cheap Chinese Preamp
  222. Need help with plate CCS in 6EM7
  223. Need help on replacing Cap on Marantz 8
  224. Transformer for 12ax7 B+ calculation
  225. First amp build, advice and thoughts encouraged!!
  226. Proposed E-Linear PP 6L6GB w/ EL83 LTP - Critique?
  227. Luxman CL36, schematic
  228. Help with input impedance
  229. phono sp16
  230. Looking for a 20W amp schematics
  231. Ruggedized tube construction?
  232. Quicksilver full function preamplifier
  233. Another variants of using PCB from Ebay
  234. Valves very close each other...
  235. HF valve amp?
  236. Eico ST70 construction manual...
  237. Audio Research $30 FET!
  238. value in humour
  239. "rejuvenate" oxide cathode
  240. el84 se amp layout
  241. the grand return. 3d21A triode PP
  242. How did receiving valve manufacture compare to the LHC ...
  243. Classi RIAA preamp questions
  244. Max input voltage with negative feedback in place?
  245. Is there a 9-pin mini equivalent of 6AU6?
  246. Which DHT tube, mu>30 driver duty
  247. LTP and H3 distortion
  248. Schematics for Bendix 6384
  249. Has anybody compared distortion profiles of their amp designs?
  250. Dynacord transformer sparks flying

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