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  1. MU follower - distortion
  2. lighting transformers 12V
  3. Chinese 6N3 preamp questions
  4. Why are Chinese preamp knockoffs so popular?
  5. 4K7 OPT suitable for 6550/KT88?
  6. Transformer question - 110 v and 25 v from 1 secondary?
  7. About loadline again, how to choose load and current
  8. Parallel Output Transformers
  9. 6SN7 / 6V6 power amp : very odd behavour
  10. HV mA Spec on Large RCA Power Xfmr?
  11. Is the Aikido too 'bright'?
  12. Has anyone put the Glassware phono & line amps in same box?
  13. High impedance balanced output: how long the cable?
  14. Data Sheets
  15. Can I use a LM317 bias on lower cathode of SRPP?
  16. AU-34 Output transformer replacement question
  17. The new KT120 from tungsol
  18. em83 questions
  19. Push-pull PCL84 schematic and a question
  20. confused on power transformer ratings
  21. C3g:GM70:GM70 schematic advice
  22. Can someone explain Load Lines?
  23. Humming from WCF but not SRPP
  24. Gas regulator tubes
  25. Lowrey LC1 B schematic wanted
  26. Complete tube amp novice got a few questions!!
  27. jacked up the bias...WOW!
  28. Looking for PP 7027a shematic
  29. So, if it's not DIY Gene, then what?
  30. What driver tube for 200Vrms?
  31. Tube socket purchase
  32. Something I found interesting a while ago!
  33. Eico HF-22 Circuit
  34. SEDHT amp - decisions decisions
  35. Confused with designing
  36. Digitally controlled analog attenuator
  37. Purchased my 1st valve amp and can only get one channel working, please help!
  38. Another silly tube yesting question
  39. potentially very stupid questions....
  40. Tube rectifier: AZ1, AZ31, AZ50 vs 5u4
  41. Tube Square-Law, what and how to set up?
  42. Need help finding schematic. Conn 720
  43. OPT for parafeed SE
  44. Anyone else tried an opamp as a driver?
  45. e180f/6688 pentode operting points
  46. power supply reassignment problem
  47. Mains power transformer on S5 K-12 kit hums?
  48. Oriole OPT
  49. 26DQ5's vs 26HU5's vs 6KN6's and transformers
  50. SRPP power using power tranny as OPT?
  51. Need guidance with heathkit SA-2 refurbish/mods
  52. B+ discharge times!
  53. 26HU5's....and a confession
  54. Bell Sound Systems Pacemaker Model 2220
  55. Any thoughts on this transformer on eBay?
  56. Need some help figuring out a Wurlitzer 6240.
  57. Bypassing cathode resistor on pp power tube
  58. TRIODE Voltage amp + Power OP output follower
  59. Cats and tube-a-holics
  60. Replace Tube Rectifier With Weber CC?
  61. 717a 2 stage SE amplifier
  62. Thoughts on Oatley K282 Valve Preamp?
  63. SS rectifier for SimpleSE and others...
  64. Need match Pr KT-88
  65. EL34 PP - again !!!
  66. S5 K-12 Kit sounds excellent with iPod, but relatively low volume with turntable?
  67. Finished K-12 Kit with cedar / brass chassis (pics)
  68. Tubes HOT!
  69. Use P-P OPT for SE?
  70. Safety ?
  71. 851 set?
  72. dual cathode follower problem
  73. Question about connecting grounds
  74. Is it okay for capacitors to be close to the main power transformer in S5 K-12 Kit?
  75. Fisher 500C Schematic
  76. looking for PP 6l6 schematic
  77. Muiscal Paradise MP-301 6V6 amp.
  78. First Build - PS Voltage Question?
  79. Need help about an hybrid amp circuit
  80. Pioneer SX-348 - Service manual?
  81. Tube PS for mic preamp Help
  82. Add rectifier tube to yaqin mc10l? What size is best?
  83. global negative feedback schematic
  84. Signal transformer question
  85. What speaker system for tube amplifier
  86. 39/44 Tube
  87. tube-aholics anonymous ?
  88. 12AX7 heaters from 9VAC transformer
  89. Cant stop Aikido Humming
  90. Question about potential transformer placement in K-12 Kit
  91. Extra pins on replacement potentiometer for K-12 tube kit?
  92. SRPP - issues understanding how to increase current
  93. ARC Power source+Marantz 7C(PCB edition)
  94. Repair and adjustment tips
  95. trimax output transformer TA2444
  96. anyone recognize this valve?
  97. Microphone Preamp design
  98. 6CM5 hi-fi amplifier
  99. Building an amp try #2
  100. Can the 6S33S/6C33C be mounted horizontally?
  101. A heptode question
  102. Looking for a 807 amp with 4 pairs of 807's
  103. pp output transformer miniblok2
  104. John Swenson's BDT preamp - finally!!
  105. Voice of Music console 816
  106. Steve Bench 1 tube reg in all glass
  107. Conn Caprice 427 needs new 12AU7 tubes—advice?
  108. Position of Iron in Can of HK Citation II Output Transformers
  109. Bottle size,does it matter in matched quads?
  110. Heater Pots?
  111. Current calculation from datasheet
  112. Any one ever seen this amp?
  113. Guiguang 300B for 300Beast.....
  114. FLEA PPP, all ecc99
  115. Well, it is time to start thinking about winter projects. GM70
  116. aghhh is my tube okay?
  117. Grid Bias provided by transformer secondary winding, what is this stuff about?
  118. Zener regulated supplies
  119. OPT fore drive ribbon speaker directly; why not ?
  120. van Dorn's Octode design - recommendations for a 10W/ch version
  121. Outrageous Speaker/Amplifier Idea
  122. Anyone ever made the EL84 P-P circuit referenced on the Tubecad Journal site?
  123. Cathode Follower ideas please.....
  124. Anyone used the NTE1866 VU LED driver?
  125. Any potential problems when using a combo potentiometer / power switch on a K-12 kit?
  126. Help needed understanding component values.
  127. Separate passive pre and monoblocks?
  128. My new diy site
  129. Valves and musical instruments
  130. My DC Darling
  131. Question - add LED power indicator to Aikido pre
  132. Colorful amps
  133. Aikido Cathode Follower
  134. Converting a dirty channel to clean?
  135. A few questions about transformer placement in an S5 K-12 tube amplifer
  136. Bogen AP30 and new member
  137. Echocord Super 62 Feedback at Low Levels?
  138. Direct Coupled 76/5687 linestage
  139. Be kind to your 5AR4 and input capacitor
  140. New Self-Powered ROHS compliant electronic device invented!
  141. Making my first hifi tube amp.
  142. Variation on Rodīs bias servo
  143. "No Light District" P-P amplifier
  144. What kind of tubes do i have?
  145. Single tube SE with EML-20B
  146. LED bias cathodyne
  147. Diagnosing hum???
  148. Posted tube microphone preamp design
  149. Finally put the Aikido in a proper chassis
  150. Tube Preamp / Headphone amp question...
  151. Phono Preamp
  152. Initial 'DQ5' testing
  153. Free Tube Amplifier Schematic Diagrams
  154. The Impressive Vetruvio GM70 SET amp.
  155. 6sn7 subminature??
  156. One channel louder than other
  157. phono amp question - adding input tx
  158. Ebay "clones" PCB
  159. Phase splitter and balance input
  160. At Last....First Build Complete...6V6/6SL7
  161. Amplifier input
  162. The Tube Maze
  163. Variable Harmonizer
  164. Vetruvio Audio; new competition for the Chinese?
  165. Transmitting tube-driven transmitting tube SET amp?
  166. Circlotron questions
  167. Home Grown tube amps
  168. LT108 Oscillation sounds like tube rush/white noise
  169. Cool looking tubes anyone...
  170. st70 standby switch/cathode stripping SS rect
  171. BoM for an RH84 mono build?
  172. Signal hum ideas please.
  173. E88CC turbo
  174. SRPP vs. plate loaded, musicality and details
  175. 300B/EL156 Amp
  176. Just new one .all new layout.
  177. Am I correct????
  178. Need help identifying this amp...
  179. The Maggie factor
  180. Help wiring up anLED Bar
  181. E810F/7788 Pinout name/number?
  182. Adjust cathode bias pot - both channels move together. Why?
  183. Building a 45 SET
  184. Stereo Pententometer Questions
  185. dm160 magic eye help
  186. Zener heater regulator
  187. Dead Time - Correcting for it
  188. ARC Power source+ 12AX7&12AU7 Pre-amplifier
  189. PTC Thermistor for auto fixed bias
  190. How do I calculate output power?
  191. Microcontrollers in tube amps
  192. Dynaco PAT4/Aikido tube preamp
  193. RCA red base 5691 / 5692
  194. Updating my amps....and "hello" :-)
  195. my first attempt
  196. Finished my first PP amp, 6SJ7-6SN7-6v6
  197. Triode PP OP stage combining Blumlein Garter and CCS bias - anyone tried this?
  198. 6U8 Revisited
  199. DePalma redux
  200. Could this be a perfectly linear triode?
  201. Grounding elevated ccs series filament supply
  202. What to do with E182CC's
  203. Angela EL34 opinions please
  204. Chinese 6N1 tube replacement
  205. Ridiculous Hallucinations
  206. Transformer Ratings
  207. dB Meter with tube circuit
  208. Suggestions for pp or se monos
  209. Low filament current tubes
  210. Tube Clearout
  211. First tube amp, it needs maintenance
  212. Need EF86 phono preamplifier shematic
  213. cannot locate documentation on SCA 9190 receiver
  214. Ecc88 pin 9 connection??
  215. VTL Compact100 Monoblock Blows Fuse
  216. 300b driver revisited.
  217. SYclotron schematic
  218. Hum problem
  219. Suppo el34
  220. my new tube experience
  221. LL1682PP Lundahl
  222. BP Ultrapath
  223. Tube shops/sellers in Kiev , Ukraine ?
  224. Headphones with tubes...
  225. A Triad xfmr for a voltage doubler PSU
  226. Ra-100
  227. Series Resistors on Outputs of Transformer?
  228. what's up !? new choke=subsonic pumping
  229. How to get the best out of the 6C33C-B?
  230. TO-220 PCB spacing for HV MOSFETs
  231. Need input on Buffer stage to use in Preamp..
  232. quad output tube help
  233. "Stacking" power transformer secondaries?
  234. Tubes flare on start up!!
  235. Grid Stopper Advice - Graphs Included!
  236. Wanted! single-ended 807 schematic
  237. sputtering 5u4 on diy Wheatfield amp
  238. Is this output transformer faulty?
  239. Help identify variac
  240. what's a good layout for a quad EL84 amp on this box?
  241. Scott 350B Tuner; Bridge Rectifier
  242. intermitent static pops from speakers st70
  243. baxandall type tone control for diff amp
  244. Stage amps using DHTs
  245. Tube+OP My headphono & preamp
  246. NFB Clarification
  247. James output transformers
  248. I just bought a an old valve amp
  249. Bias Curves
  250. Triode in Class B or Beam Pentode in Class AB2

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