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  1. 6sn7-300b
  2. Balanced tube phono stage
  3. Your favorite 12B4A for a preamp ?
  4. Voltage rating for output coupling caps in 6J1 tube buffer?
  5. Single stage 845 amp
  6. Eagle tube library
  7. Using Choke in Choke Input Power Supply ?
  8. 6550 wrong high bias...
  9. Floating Bridged CCS Loaded P-P Tube Amp
  10. What to do with a problem Counterpoint SA-12
  11. 6Z9P Mu Stage max anode-cathode voltage
  12. Audio Innovations Series 500 parts
  13. Hagerman Trumpet phonostage
  14. PS design...success or failure?
  15. Kuba Serenade Stereo Console - Part III - Replacing all caps
  16. schematic of Knight KP-70 preamp or anyone having this amp?
  17. 6N6P Cathode Follower design value
  18. Radiotron 32W PP amp from RDH3
  19. Heater filament questions
  20. 46 in ultralinear mode
  21. help needed need transformer prim 230/110 sec 300v appr. 20ma +6,3v or 12,6v
  22. Output transformer confusion
  23. need amp schematic help
  24. lm317 and heater supply.
  25. BJT Voltage Bootstrap - SLCF
  26. Ideas for a cheap 200mA tube rectified PSU
  27. Need help with tube rectifier
  28. Tube or Circuit Noise?
  29. JE Labs (Angela instr.) : your favorite 2A3 schematic ?
  30. Crack the Code Amp build 1000 Watt Tube Amplifier
  31. 12E1 in fixed bias - too much current!
  32. CD-DVD player vs Notebook-usb soundcard sensitivity issue
  33. photo of Knight KP-70 preamplifier for missing component
  34. heater wear sign?
  35. Musical Fidelty X-10D Clone
  36. 815 amp
  37. Jorgen Schou 31,5 OT connection
  38. Is there such a thing....
  39. Tube Rectifiers and Common Grounds
  40. vt4c.com copper tube socket mounts
  41. 1 Ohm Tap Output tranformers?
  42. Voltage Specs For Heaters-Is 2.4V Good Enough?
  43. Aikido with 5842
  44. Luxman MQ70
  45. Valve pre-amp schematic help needed
  46. valves' world - tossie Japan
  47. 211 amp , recognize the circuit?
  48. Tube Preamp: Remedy For Digital Glare?
  49. Counterpoint 7A
  50. Low Z Out Dual Triode
  51. Push Pull circuit - controlling sensitivity
  52. Moto 3 channel to Maggy 175
  53. PMillett Landfall heatsink
  54. lower the gain
  55. KT88?
  56. Sphinx Project Fourteen help wanted
  57. will this work and looking for suggestions
  58. Squeal on shutdown
  59. Newbie to SRPP and Tubes , 1 question.
  60. Question about interconnect transformers
  61. another toy - el84 PP class A
  62. Problem with biasing - no voltage drop on a cathode resistor
  63. EL84 PP current fluctuating
  64. Aikido Preamp Questions (again)
  65. Amp caused crack
  66. OPT performances
  67. Hammond 125ESE in 2A3 SE : better substitutions ?
  68. Headphone Impedance and headphone amplifier
  69. Could this tube be good for audio ?
  70. Output Transformer for SE / headphone amp
  71. pioneer sm-b200a
  72. 12AT7 Tubes ?
  73. Gold Lion kt77 bias help?
  74. Need some bias control help
  75. Lafayette LA-224a/b modernization?
  76. Need help completing vintage 6L6 amp
  77. Direct Russian equivilent for 5687, is there one ?
  78. Attenuation for 0.5dBs
  79. Dynaco ST-120 Impedance Concern Martin Logan
  80. Some 1626 Darling Amp Questions
  81. Choosing a SE 2A3 shematic : hum as a criteria...
  82. Rectifier question, voltage across diode.
  83. Angela simple 2A3
  84. Cathode follower - resistor calculations/software
  85. Desperately Seeking OPT Covers
  86. Modified Tube Cricket Amp Questions
  87. Best sounding DIY amp kits for 45, 2A3 or 300B
  88. Pentode's screen voltage/current
  89. KT88 Cathode Current Runaway/Oscillations?
  90. O'netics, Electra Print: anyone have both?
  91. How to maximize power transfer in tube circuit designs, damping is not the question!
  92. Inexpensive 2.5k primary SET OPT with 90mA+ DC bias rating?
  93. 4p1L Ultralinear
  94. RH300B 12W with 1% THD
  95. This is where the adventure begins
  96. 12AU7 pre rebuild suggestions
  97. Subwoofer Channel on Tube Amp
  98. Changing input tube from 12ax7 to 6AU6A on OTL project
  99. Yaqin MC5881a
  100. Humming Sound from tube amp
  101. Level Five 2A3 SE schematic : opinions ?
  102. My screwup = free PCBs...
  103. New stuff on the website: A2 buffer, isolated current sensor
  104. 12.6vDC Heaters, looking for a shortcut
  105. Fisher 80-AZ bias milliamps?
  106. Can shed some light on this EL 34 schematic diagram
  107. Solid State Rectifier in Dynaco Tube Amp
  108. Big chassis designs!
  109. 12ax7 LP
  110. plitron output w/ cfb usage ideas
  111. 390 ohm should have been 390k ohm
  112. Advice sought re what tube power amp
  113. EL34 SED Winged C Black Prints: original??
  114. OPTx from Ogonowski
  115. Aikido cathode follower (ACF) with 12au7
  116. SEP EL-34 to 6L6GC?
  117. Volume Pot Spec
  118. My Tube Pre-Amp Picking up an AM radio station?
  119. Philips 6SN7 GTA & GTB
  120. ST-120 Problem With Rectifier Tube
  121. New Yaqin VK-2100
  122. Electronic parts and sub-zero temperature
  123. Bendix 6384 as EL34: Experience anyone?
  124. Audioresearch LS2B schematic needed
  125. input noise - too simple - but need explaination
  126. Plate voltage with/without tube (for fine tune bias adjustemnt)
  127. Using trimmers / potentiometers to adjust tube operating points
  128. KT88 SED winged C tolerance tall for quad
  129. Power Transformer Tolerances
  130. 12E1 Ultra Linear
  131. Comparison KT150 versus KT120
  132. 6sn7: GT GTA GTB sono differences for HIFI
  133. Audio Research LS5 Power Supply Problem
  134. Vintage grundig vs. new Yaqin. Advice?
  135. 5AR4 PSU
  136. What tube is this ?
  137. Need Schematic
  138. Budget PP Iron: Transcendar or Edcor?
  139. Yaqin MC-10L buzz
  140. Transformer buzzing when filament section is loaded
  141. Grid Stopper v Grid Leak on el84
  142. 2.5V Heater Tranformer-Best to Use One Per Channel?
  143. Amp: KT88 push-pull shunt feedback output via p-channel fet
  144. My biggest fear....
  145. I've made an awful mess...
  146. Any input for a tube noob's first attempt? Flea Watt 12b4, 6dj8, low B+
  147. Kolster-Brandes er30
  148. Buzz that goes away when input grounded.
  149. Hovland HP-100 tube replacement
  150. Dynaco ST-120 Turn On Pop or Problem
  151. Grounding two channel preamp sharing a psu.
  152. Convert hybrid amp to pure tube output?
  153. Please Help me with this tubes
  154. 211- 6e5p full amp. The first setps
  155. E810F and general pentodes design question
  156. Pop goes the bias cap.
  157. High Power Single Ended Triode, Design
  158. Yaqin MS-6V6 vs. Markhill MS-6V6
  159. Schematic please: Luxman MQ-70?
  160. Aikido tube preamp with Tortuga LDR volume control
  161. Type 37 tube preamp
  162. Figuring out a KT88 datasheet?
  163. Power supply 260V for tube preamp
  164. Aikido Tube with Tortuga volume control project
  165. Adding a pre out to amp
  166. One or two ECC82 for two channels (crosstalk)!
  167. Red Pilot (240)
  168. 77:1 Output Transformer Question
  169. Power transformer recommendation Kt88 SE and JE labs Riaa
  170. Tube output power for OPT calculation
  171. 6sn7 tube anode folower question?????
  172. Goldox 9300
  173. good quality/sounding preamp advice
  174. PL84 schematic question.
  175. YouTube Video: 12AX7 comparisons.
  176. How many volts ???
  177. Greetings all/ (newbie) Need Advice!
  178. Psud and Single Ended Amplifier
  179. Socket Combiniations
  180. From Potentiometer to Stepped Attenuator
  181. No need for bleed resistors on Fisher 90-T
  182. Sophia 300B+ carbon
  183. PL519 amp SE
  184. C3g Headphone design - will this work?
  185. Luxman 2A3 amp SE
  186. Capacitor on Aikido Power Supply Sampling Circuit
  187. Well, what have I done now?
  188. Aikido CF cathode resistor?
  189. D3A - 6P45S/El519 SE "The staircase" my first h-end amplifier.
  190. SET Cathode Biased vs. Fixed Bias?
  191. JAN6418 pre-amp advise
  192. SOHA II amp tripping
  193. 6JN6 LTspice model?
  194. unusual output transformers, what are they for?
  195. Cheap power amp kit with 6N2 + 6P3
  196. KT88 AMP I'm not sure about power supply
  197. buzz from tubes
  198. Good Power Supply??
  199. Audio Research SP6C
  200. Junk Audio Project (pics)
  201. SE SV83 Paralled Tube Amplifer
  202. Hum in SVP preamp circuit
  203. Advice/tips on tube preamplifier wanted
  204. Transformer Windfall. Now what?
  205. I am being cautious - need to install a ground plug
  206. My first scratch build (6AQ5 SE)....
  207. Pop, Pop, Pop, Pop, Pop
  208. what is this valve? and what is it for??
  209. Lazarus cascade basic preamp
  210. Seperate Power Supply Chassis and Grounding
  211. How To Solder Tips and Tricks
  212. Another CD player tube mod, TDA1541 with transformers and triode cathode followers
  213. PCL86 - Worth a try?
  214. Audio use 3D6/1299 ?
  215. How HOT should a LM317 get?
  216. KT88 amp questions
  217. Restoring a Motorola HS-1048A amp
  218. Please look at this schematic and tells me what have went wrong
  219. Lacking bass response after re-cap
  220. Generate a negative bias voltage?
  221. hammond 369ex instead of 269ex
  222. Recapped a pair of monoblocks
  223. Top Secret!
  224. Toggle or Rotary Switch for Phono Inputs
  225. Flexible tube (or SS) electronic XO
  226. LAVATORY - Lamp Valve Transistor Hybrid (will this work?)
  227. Transformer revers use question
  228. Fixed bias, cathode feedback?
  229. spudnik, spudMiG ?
  230. I need the KT120 base dimensions
  231. Need help with chassis layout.
  232. tube amp ID ?
  233. GU50 filaments voltage!
  234. Does anybody have an RCA RS171 Schematic
  235. Opinions wanted: Low Z SE power supplies
  236. DC heaters, best way to bias ?
  237. Ignition coil as SE OPT
  238. Opt color code identification (Onetics)
  239. Drawback to Larger Capacity Output Transformer Than Required?
  240. Send me some pictures of your amps
  241. leak stereo 60
  242. B2 Spice V5.0
  243. Mains Fuse and Switch Best Practice
  244. Identify these vintage tube amp rivets
  245. RCA ORTHOPHONIC LMI-32216A manual copy needed
  246. Question on strange 6l6 schematic symbols
  247. Resistor value?
  248. ST70 chassis polishing
  249. Octal to RCA
  250. KT120 plate load for 150+watts

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