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  1. Simple tube kit for tube sound ?
  2. Voltage Divider with Capacitor Across Resistor to Ground
  3. FM Demodulator for Tube receivers
  4. The best amp to DIY?
  5. SE Tubelab / EL34b tubes / Transformers
  6. Heath Kit Pre Amp
  7. Preamp hiss noise
  8. Tube preamp?
  9. 417a load line
  10. 6N1 + 6P3P build, need some help.
  11. Caps connected in series in Audio Note kit 4
  12. Ground loop cure?
  13. Dynaco ST-70 Clone
  14. Op Amp Phase Splitter
  15. Idea for ECC85 or EM84?
  16. Why no sound?
  17. single ended tube amp sounds itself
  18. Proper Pentode Usage 717A (713A)
  19. Help with Mullard 5 20 project
  20. Help on Negative Feedback in KT66 PP
  21. Trying to understand 6BM8 regulator (audio note clone)
  22. 6AS7 headphone amp with Sophia Electric Mesh plate 274B rec. tube
  23. CR Kalypso Amp with output stage problem- Please help!
  24. "PEAK INPUT SIGNAL GRID-TO-GRID" question.
  25. EZ81 Load
  26. Rectifier question
  27. 6sn7-300b
  28. Balanced tube phono stage
  29. Your favorite 12B4A for a preamp ?
  30. Voltage rating for output coupling caps in 6J1 tube buffer?
  31. Single stage 845 amp
  32. Eagle tube library
  33. Using Choke in Choke Input Power Supply ?
  34. 6550 wrong high bias...
  35. Floating Bridged CCS Loaded P-P Tube Amp
  36. What to do with a problem Counterpoint SA-12
  37. 6Z9P Mu Stage max anode-cathode voltage
  38. Audio Innovations Series 500 parts
  39. Hagerman Trumpet phonostage
  40. PS design...success or failure?
  41. Kuba Serenade Stereo Console - Part III - Replacing all caps
  42. schematic of Knight KP-70 preamp or anyone having this amp?
  43. 6N6P Cathode Follower design value
  44. Radiotron 32W PP amp from RDH3
  45. Heater filament questions
  46. 46 in ultralinear mode
  47. help needed need transformer prim 230/110 sec 300v appr. 20ma +6,3v or 12,6v
  48. Output transformer confusion
  49. need amp schematic help
  50. reviving an old Randall RGT100
  51. lm317 and heater supply.
  52. BJT Voltage Bootstrap - SLCF
  53. Ideas for a cheap 200mA tube rectified PSU
  54. Need help with tube rectifier
  55. Tube or Circuit Noise?
  56. JE Labs (Angela instr.) : your favorite 2A3 schematic ?
  57. Crack the Code Amp build 1000 Watt Tube Amplifier
  58. 12E1 in fixed bias - too much current!
  59. CD-DVD player vs Notebook-usb soundcard sensitivity issue
  60. photo of Knight KP-70 preamplifier for missing component
  61. heater wear sign?
  62. Musical Fidelty X-10D Clone
  63. 815 amp
  64. Jorgen Schou 31,5 OT connection
  65. Is there such a thing....
  66. Tube Rectifiers and Common Grounds
  67. vt4c.com copper tube socket mounts
  68. 1 Ohm Tap Output tranformers?
  69. Voltage Specs For Heaters-Is 2.4V Good Enough?
  70. Aikido with 5842
  71. Luxman MQ70
  72. Valve pre-amp schematic help needed
  73. valves' world - tossie Japan
  74. 211 amp , recognize the circuit?
  75. Tube Preamp: Remedy For Digital Glare?
  76. Tubelab SSE without tube rectifier
  77. Counterpoint 7A
  78. Low Z Out Dual Triode
  79. Push Pull circuit - controlling sensitivity
  80. Moto 3 channel to Maggy 175
  81. PMillett Landfall heatsink
  82. lower the gain
  83. KT88?
  84. Sphinx Project Fourteen help wanted
  85. will this work and looking for suggestions
  86. Squeal on shutdown
  87. Newbie to SRPP and Tubes , 1 question.
  88. Question about interconnect transformers
  89. another toy - el84 PP class A
  90. Problem with biasing - no voltage drop on a cathode resistor
  91. EL84 PP current fluctuating
  92. Aikido Preamp Questions (again)
  93. Amp caused crack
  94. OPT performances
  95. Hammond 125ESE in 2A3 SE : better substitutions ?
  96. Headphone Impedance and headphone amplifier
  97. Could this tube be good for audio ?
  98. Output Transformer for SE / headphone amp
  99. pioneer sm-b200a
  100. 12AT7 Tubes ?
  101. Gold Lion kt77 bias help?
  102. Need some bias control help
  103. Lafayette LA-224a/b modernization?
  104. Need help completing vintage 6L6 amp
  105. Direct Russian equivilent for 5687, is there one ?
  106. Attenuation for 0.5dBs
  107. Dynaco ST-120 Impedance Concern Martin Logan
  108. Some 1626 Darling Amp Questions
  109. Choosing a SE 2A3 shematic : hum as a criteria...
  110. Rectifier question, voltage across diode.
  111. Angela simple 2A3
  112. Cathode follower - resistor calculations/software
  113. Desperately Seeking OPT Covers
  114. Modified Tube Cricket Amp Questions
  115. Best sounding DIY amp kits for 45, 2A3 or 300B
  116. Pentode's screen voltage/current
  117. KT88 Cathode Current Runaway/Oscillations?
  118. O'netics, Electra Print: anyone have both?
  119. How to maximize power transfer in tube circuit designs, damping is not the question!
  120. Inexpensive 2.5k primary SET OPT with 90mA+ DC bias rating?
  121. 4p1L Ultralinear
  122. RH300B 12W with 1% THD
  123. This is where the adventure begins
  124. 12AU7 pre rebuild suggestions
  125. Subwoofer Channel on Tube Amp
  126. Changing input tube from 12ax7 to 6AU6A on OTL project
  127. Yaqin MC5881a
  128. Humming Sound from tube amp
  129. Level Five 2A3 SE schematic : opinions ?
  130. My screwup = free PCBs...
  131. New stuff on the website: A2 buffer, isolated current sensor
  132. 12.6vDC Heaters, looking for a shortcut
  133. Fisher 80-AZ bias milliamps?
  134. Can shed some light on this EL 34 schematic diagram
  135. Solid State Rectifier in Dynaco Tube Amp
  136. Big chassis designs!
  137. 12ax7 LP
  138. plitron output w/ cfb usage ideas
  139. 390 ohm should have been 390k ohm
  140. Advice sought re what tube power amp
  141. EL34 SED Winged C Black Prints: original??
  142. OPTx from Ogonowski
  143. Aikido cathode follower (ACF) with 12au7
  144. Ampeg vt60 tri ax (did it really exist?)
  145. SEP EL-34 to 6L6GC?
  146. Volume Pot Spec
  147. My Tube Pre-Amp Picking up an AM radio station?
  148. Philips 6SN7 GTA & GTB
  149. ST-120 Problem With Rectifier Tube
  150. New Yaqin VK-2100
  151. Electronic parts and sub-zero temperature
  152. Bendix 6384 as EL34: Experience anyone?
  153. Audioresearch LS2B schematic needed
  154. input noise - too simple - but need explaination
  155. Plate voltage with/without tube (for fine tune bias adjustemnt)
  156. Using trimmers / potentiometers to adjust tube operating points
  157. KT88 SED winged C tolerance tall for quad
  158. Power Transformer Tolerances
  159. 12E1 Ultra Linear
  160. Comparison KT150 versus KT120
  161. 6sn7: GT GTA GTB sono differences for HIFI
  162. Audio Research LS5 Power Supply Problem
  163. Vintage grundig vs. new Yaqin. Advice?
  164. 5AR4 PSU
  165. What tube is this ?
  166. Need Schematic
  167. Budget PP Iron: Transcendar or Edcor?
  168. Yaqin MC-10L buzz
  169. Transformer buzzing when filament section is loaded
  170. Grid Stopper v Grid Leak on el84
  171. 2.5V Heater Tranformer-Best to Use One Per Channel?
  172. Amp: KT88 push-pull shunt feedback output via p-channel fet
  173. My biggest fear....
  174. I've made an awful mess...
  175. Any input for a tube noob's first attempt? Flea Watt 12b4, 6dj8, low B+
  176. HV scope use
  177. Kolster-Brandes er30
  178. Buzz that goes away when input grounded.
  179. Hovland HP-100 tube replacement
  180. Dynaco ST-120 Turn On Pop or Problem
  181. Grounding two channel preamp sharing a psu.
  182. Convert hybrid amp to pure tube output?
  183. Please Help me with this tubes
  184. resistor maximum voltage rating
  185. 211- 6e5p full amp. The first setps
  186. E810F and general pentodes design question
  187. Pop goes the bias cap.
  188. High Power Single Ended Triode, Design
  189. Yaqin MS-6V6 vs. Markhill MS-6V6
  190. Schematic please: Luxman MQ-70?
  191. Aikido tube preamp with Tortuga LDR volume control
  192. Type 37 tube preamp
  193. Figuring out a KT88 datasheet?
  194. Power supply 260V for tube preamp
  195. Aikido Tube with Tortuga volume control project
  196. Adding a pre out to amp
  197. One or two ECC82 for two channels (crosstalk)!
  198. Red Pilot (240)
  199. 77:1 Output Transformer Question
  200. Power transformer recommendation Kt88 SE and JE labs Riaa
  201. Tube output power for OPT calculation
  202. 6sn7 tube anode folower question?????
  203. Goldox 9300
  204. good quality/sounding preamp advice
  205. PL84 schematic question.
  206. YouTube Video: 12AX7 comparisons.
  207. How many volts ???
  208. Greetings all/ (newbie) Need Advice!
  209. Psud and Single Ended Amplifier
  210. Socket Combiniations
  211. From Potentiometer to Stepped Attenuator
  212. No need for bleed resistors on Fisher 90-T
  213. Sophia 300B+ carbon
  214. Capacitor Temperature
  215. PL519 amp SE
  216. C3g Headphone design - will this work?
  217. Luxman 2A3 amp SE
  218. Capacitor on Aikido Power Supply Sampling Circuit
  219. Well, what have I done now?
  220. Aikido CF cathode resistor?
  221. D3A - 6P45S/El519 SE "The staircase" my first h-end amplifier.
  222. SET Cathode Biased vs. Fixed Bias?
  223. JAN6418 pre-amp advise
  224. SOHA II amp tripping
  225. 6JN6 LTspice model?
  226. unusual output transformers, what are they for?
  227. Cheap power amp kit with 6N2 + 6P3
  228. KT88 AMP I'm not sure about power supply
  229. buzz from tubes
  230. Good Power Supply??
  231. HK guitar amp - help with repair
  232. Audio Research SP6C
  233. Junk Audio Project (pics)
  234. SE SV83 Paralled Tube Amplifer
  235. Hum in SVP preamp circuit
  236. Advice/tips on tube preamplifier wanted
  237. Transformer Windfall. Now what?
  238. I am being cautious - need to install a ground plug
  239. My first scratch build (6AQ5 SE)....
  240. Pop, Pop, Pop, Pop, Pop
  241. what is this valve? and what is it for??
  242. Lazarus cascade basic preamp
  243. Seperate Power Supply Chassis and Grounding
  244. How To Solder Tips and Tricks
  245. Another CD player tube mod, TDA1541 with transformers and triode cathode followers
  246. PCL86 - Worth a try?
  247. Audio use 3D6/1299 ?
  248. How HOT should a LM317 get?
  249. KT88 amp questions
  250. Restoring a Motorola HS-1048A amp

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