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  1. EZ81 Load
  2. Rectifier question
  3. 6sn7-300b
  4. Balanced tube phono stage
  5. Your favorite 12B4A for a preamp ?
  6. Voltage rating for output coupling caps in 6J1 tube buffer?
  7. Single stage 845 amp
  8. Eagle tube library
  9. Using Choke in Choke Input Power Supply ?
  10. 6550 wrong high bias...
  11. Floating Bridged CCS Loaded P-P Tube Amp
  12. What to do with a problem Counterpoint SA-12
  13. 6Z9P Mu Stage max anode-cathode voltage
  14. Audio Innovations Series 500 parts
  15. Hagerman Trumpet phonostage
  16. PS design...success or failure?
  17. Kuba Serenade Stereo Console - Part III - Replacing all caps
  18. schematic of Knight KP-70 preamp or anyone having this amp?
  19. 6N6P Cathode Follower design value
  20. Radiotron 32W PP amp from RDH3
  21. Heater filament questions
  22. 46 in ultralinear mode
  23. help needed need transformer prim 230/110 sec 300v appr. 20ma +6,3v or 12,6v
  24. Output transformer confusion
  25. need amp schematic help
  26. lm317 and heater supply.
  27. BJT Voltage Bootstrap - SLCF
  28. Ideas for a cheap 200mA tube rectified PSU
  29. Need help with tube rectifier
  30. Tube or Circuit Noise?
  31. JE Labs (Angela instr.) : your favorite 2A3 schematic ?
  32. Crack the Code Amp build 1000 Watt Tube Amplifier
  33. 12E1 in fixed bias - too much current!
  34. CD-DVD player vs Notebook-usb soundcard sensitivity issue
  35. photo of Knight KP-70 preamplifier for missing component
  36. heater wear sign?
  37. Musical Fidelty X-10D Clone
  38. 815 amp
  39. Jorgen Schou 31,5 OT connection
  40. Is there such a thing....
  41. Tube Rectifiers and Common Grounds
  42. vt4c.com copper tube socket mounts
  43. 1 Ohm Tap Output tranformers?
  44. Voltage Specs For Heaters-Is 2.4V Good Enough?
  45. Aikido with 5842
  46. Luxman MQ70
  47. Valve pre-amp schematic help needed
  48. valves' world - tossie Japan
  49. 211 amp , recognize the circuit?
  50. Tube Preamp: Remedy For Digital Glare?
  51. Counterpoint 7A
  52. Low Z Out Dual Triode
  53. Push Pull circuit - controlling sensitivity
  54. Moto 3 channel to Maggy 175
  55. PMillett Landfall heatsink
  56. lower the gain
  57. KT88?
  58. Sphinx Project Fourteen help wanted
  59. will this work and looking for suggestions
  60. Squeal on shutdown
  61. Newbie to SRPP and Tubes , 1 question.
  62. Question about interconnect transformers
  63. another toy - el84 PP class A
  64. Problem with biasing - no voltage drop on a cathode resistor
  65. EL84 PP current fluctuating
  66. Aikido Preamp Questions (again)
  67. Amp caused crack
  68. OPT performances
  69. Hammond 125ESE in 2A3 SE : better substitutions ?
  70. Headphone Impedance and headphone amplifier
  71. Could this tube be good for audio ?
  72. Output Transformer for SE / headphone amp
  73. pioneer sm-b200a
  74. 12AT7 Tubes ?
  75. Gold Lion kt77 bias help?
  76. Need some bias control help
  77. Lafayette LA-224a/b modernization?
  78. Need help completing vintage 6L6 amp
  79. Direct Russian equivilent for 5687, is there one ?
  80. Attenuation for 0.5dBs
  81. Dynaco ST-120 Impedance Concern Martin Logan
  82. Some 1626 Darling Amp Questions
  83. Choosing a SE 2A3 shematic : hum as a criteria...
  84. Rectifier question, voltage across diode.
  85. Angela simple 2A3
  86. Cathode follower - resistor calculations/software
  87. Desperately Seeking OPT Covers
  88. Modified Tube Cricket Amp Questions
  89. Best sounding DIY amp kits for 45, 2A3 or 300B
  90. Pentode's screen voltage/current
  91. KT88 Cathode Current Runaway/Oscillations?
  92. O'netics, Electra Print: anyone have both?
  93. How to maximize power transfer in tube circuit designs, damping is not the question!
  94. Inexpensive 2.5k primary SET OPT with 90mA+ DC bias rating?
  95. 4p1L Ultralinear
  96. RH300B 12W with 1% THD
  97. This is where the adventure begins
  98. 12AU7 pre rebuild suggestions
  99. Subwoofer Channel on Tube Amp
  100. Changing input tube from 12ax7 to 6AU6A on OTL project
  101. Yaqin MC5881a
  102. Humming Sound from tube amp
  103. Level Five 2A3 SE schematic : opinions ?
  104. My screwup = free PCBs...
  105. New stuff on the website: A2 buffer, isolated current sensor
  106. 12.6vDC Heaters, looking for a shortcut
  107. Fisher 80-AZ bias milliamps?
  108. Can shed some light on this EL 34 schematic diagram
  109. Solid State Rectifier in Dynaco Tube Amp
  110. Big chassis designs!
  111. 12ax7 LP
  112. plitron output w/ cfb usage ideas
  113. 390 ohm should have been 390k ohm
  114. Advice sought re what tube power amp
  115. EL34 SED Winged C Black Prints: original??
  116. OPTx from Ogonowski
  117. Aikido cathode follower (ACF) with 12au7
  118. SEP EL-34 to 6L6GC?
  119. Volume Pot Spec
  120. My Tube Pre-Amp Picking up an AM radio station?
  121. Philips 6SN7 GTA & GTB
  122. ST-120 Problem With Rectifier Tube
  123. New Yaqin VK-2100
  124. Electronic parts and sub-zero temperature
  125. Bendix 6384 as EL34: Experience anyone?
  126. Audioresearch LS2B schematic needed
  127. input noise - too simple - but need explaination
  128. Plate voltage with/without tube (for fine tune bias adjustemnt)
  129. Using trimmers / potentiometers to adjust tube operating points
  130. KT88 SED winged C tolerance tall for quad
  131. Power Transformer Tolerances
  132. 12E1 Ultra Linear
  133. Comparison KT150 versus KT120
  134. 6sn7: GT GTA GTB sono differences for HIFI
  135. Audio Research LS5 Power Supply Problem
  136. Vintage grundig vs. new Yaqin. Advice?
  137. 5AR4 PSU
  138. What tube is this ?
  139. Need Schematic
  140. Budget PP Iron: Transcendar or Edcor?
  141. Yaqin MC-10L buzz
  142. Transformer buzzing when filament section is loaded
  143. Grid Stopper v Grid Leak on el84
  144. 2.5V Heater Tranformer-Best to Use One Per Channel?
  145. Amp: KT88 push-pull shunt feedback output via p-channel fet
  146. My biggest fear....
  147. I've made an awful mess...
  148. Any input for a tube noob's first attempt? Flea Watt 12b4, 6dj8, low B+
  149. Kolster-Brandes er30
  150. Buzz that goes away when input grounded.
  151. Hovland HP-100 tube replacement
  152. Dynaco ST-120 Turn On Pop or Problem
  153. Grounding two channel preamp sharing a psu.
  154. Convert hybrid amp to pure tube output?
  155. Please Help me with this tubes
  156. 211- 6e5p full amp. The first setps
  157. E810F and general pentodes design question
  158. Pop goes the bias cap.
  159. High Power Single Ended Triode, Design
  160. Yaqin MS-6V6 vs. Markhill MS-6V6
  161. Schematic please: Luxman MQ-70?
  162. Aikido tube preamp with Tortuga LDR volume control
  163. Type 37 tube preamp
  164. Figuring out a KT88 datasheet?
  165. Power supply 260V for tube preamp
  166. Aikido Tube with Tortuga volume control project
  167. Adding a pre out to amp
  168. One or two ECC82 for two channels (crosstalk)!
  169. Red Pilot (240)
  170. 77:1 Output Transformer Question
  171. Power transformer recommendation Kt88 SE and JE labs Riaa
  172. Tube output power for OPT calculation
  173. 6sn7 tube anode folower question?????
  174. Goldox 9300
  175. good quality/sounding preamp advice
  176. PL84 schematic question.
  177. YouTube Video: 12AX7 comparisons.
  178. How many volts ???
  179. Greetings all/ (newbie) Need Advice!
  180. Psud and Single Ended Amplifier
  181. Socket Combiniations
  182. From Potentiometer to Stepped Attenuator
  183. No need for bleed resistors on Fisher 90-T
  184. Sophia 300B+ carbon
  185. PL519 amp SE
  186. C3g Headphone design - will this work?
  187. Luxman 2A3 amp SE
  188. Capacitor on Aikido Power Supply Sampling Circuit
  189. Well, what have I done now?
  190. Aikido CF cathode resistor?
  191. D3A - 6P45S/El519 SE "The staircase" my first h-end amplifier.
  192. SET Cathode Biased vs. Fixed Bias?
  193. JAN6418 pre-amp advise
  194. SOHA II amp tripping
  195. 6JN6 LTspice model?
  196. unusual output transformers, what are they for?
  197. Cheap power amp kit with 6N2 + 6P3
  198. KT88 AMP I'm not sure about power supply
  199. buzz from tubes
  200. Good Power Supply??
  201. Audio Research SP6C
  202. Junk Audio Project (pics)
  203. SE SV83 Paralled Tube Amplifer
  204. Hum in SVP preamp circuit
  205. Advice/tips on tube preamplifier wanted
  206. Transformer Windfall. Now what?
  207. I am being cautious - need to install a ground plug
  208. My first scratch build (6AQ5 SE)....
  209. Pop, Pop, Pop, Pop, Pop
  210. what is this valve? and what is it for??
  211. Lazarus cascade basic preamp
  212. Seperate Power Supply Chassis and Grounding
  213. How To Solder Tips and Tricks
  214. Another CD player tube mod, TDA1541 with transformers and triode cathode followers
  215. PCL86 - Worth a try?
  216. Audio use 3D6/1299 ?
  217. How HOT should a LM317 get?
  218. KT88 amp questions
  219. Restoring a Motorola HS-1048A amp
  220. Please look at this schematic and tells me what have went wrong
  221. Lacking bass response after re-cap
  222. Generate a negative bias voltage?
  223. hammond 369ex instead of 269ex
  224. Recapped a pair of monoblocks
  225. Top Secret!
  226. Toggle or Rotary Switch for Phono Inputs
  227. Flexible tube (or SS) electronic XO
  228. LAVATORY - Lamp Valve Transistor Hybrid (will this work?)
  229. Transformer revers use question
  230. Fixed bias, cathode feedback?
  231. spudnik, spudMiG ?
  232. I need the KT120 base dimensions
  233. Need help with chassis layout.
  234. tube amp ID ?
  235. GU50 filaments voltage!
  236. Does anybody have an RCA RS171 Schematic
  237. Opinions wanted: Low Z SE power supplies
  238. DC heaters, best way to bias ?
  239. Ignition coil as SE OPT
  240. Opt color code identification (Onetics)
  241. Drawback to Larger Capacity Output Transformer Than Required?
  242. Send me some pictures of your amps
  243. leak stereo 60
  244. B2 Spice V5.0
  245. Mains Fuse and Switch Best Practice
  246. Identify these vintage tube amp rivets
  247. RCA ORTHOPHONIC LMI-32216A manual copy needed
  248. Question on strange 6l6 schematic symbols
  249. Resistor value?
  250. ST70 chassis polishing

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