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  1. 6SN7 / 6V6 power amp : very odd behavour
  2. HV mA Spec on Large RCA Power Xfmr?
  3. Is the Aikido too 'bright'?
  4. Has anyone put the Glassware phono & line amps in same box?
  5. High impedance balanced output: how long the cable?
  6. Data Sheets
  7. Can I use a LM317 bias on lower cathode of SRPP?
  8. AU-34 Output transformer replacement question
  9. The new KT120 from tungsol
  10. em83 questions
  11. Push-pull PCL84 schematic and a question
  12. confused on power transformer ratings
  13. C3g:GM70:GM70 schematic advice
  14. Can someone explain Load Lines?
  15. Humming from WCF but not SRPP
  16. Gas regulator tubes
  17. My B&K 707 sensitivity seems wonky
  18. Lowrey LC1 B schematic wanted
  19. Complete tube amp novice got a few questions!!
  20. jacked up the bias...WOW!
  21. Looking for PP 7027a shematic
  22. So, if it's not DIY Gene, then what?
  23. What driver tube for 200Vrms?
  24. Tube socket purchase
  25. Something I found interesting a while ago!
  26. Eico HF-22 Circuit
  27. SEDHT amp - decisions decisions
  28. Confused with designing
  29. Digitally controlled analog attenuator
  30. Purchased my 1st valve amp and can only get one channel working, please help!
  31. Another silly tube yesting question
  32. potentially very stupid questions....
  33. Tube rectifier: AZ1, AZ31, AZ50 vs 5u4
  34. Tube Square-Law, what and how to set up?
  35. Need help finding schematic. Conn 720
  36. OPT for parafeed SE
  37. Anyone else tried an opamp as a driver?
  38. e180f/6688 pentode operting points
  39. power supply reassignment problem
  40. Mains power transformer on S5 K-12 kit hums?
  41. Oriole OPT
  42. 26DQ5's vs 26HU5's vs 6KN6's and transformers
  43. SRPP power using power tranny as OPT?
  44. Need guidance with heathkit SA-2 refurbish/mods
  45. B+ discharge times!
  46. 26HU5's....and a confession
  47. Bell Sound Systems Pacemaker Model 2220
  48. Any thoughts on this transformer on eBay?
  49. Need some help figuring out a Wurlitzer 6240.
  50. Bypassing cathode resistor on pp power tube
  51. TRIODE Voltage amp + Power OP output follower
  52. Cats and tube-a-holics
  53. Replace Tube Rectifier With Weber CC?
  54. 717a 2 stage SE amplifier
  55. Thoughts on Oatley K282 Valve Preamp?
  56. SS rectifier for SimpleSE and others...
  57. Need match Pr KT-88
  58. EL34 PP - again !!!
  59. S5 K-12 Kit sounds excellent with iPod, but relatively low volume with turntable?
  60. Finished K-12 Kit with cedar / brass chassis (pics)
  61. Tubes HOT!
  62. Meng volume pot problem
  63. Use P-P OPT for SE?
  64. Safety ?
  65. 851 set?
  66. dual cathode follower problem
  67. Question about connecting grounds
  68. Is it okay for capacitors to be close to the main power transformer in S5 K-12 Kit?
  69. Fisher 500C Schematic
  70. looking for PP 6l6 schematic
  71. Muiscal Paradise MP-301 6V6 amp.
  72. First Build - PS Voltage Question?
  73. Need help about an hybrid amp circuit
  74. Pioneer SX-348 - Service manual?
  75. Tube PS for mic preamp Help
  76. Add rectifier tube to yaqin mc10l? What size is best?
  77. global negative feedback schematic
  78. Signal transformer question
  79. What speaker system for tube amplifier
  80. 39/44 Tube
  81. tube-aholics anonymous ?
  82. 12AX7 heaters from 9VAC transformer
  83. Cant stop Aikido Humming
  84. Suggestions for rotary switches
  85. Question about potential transformer placement in K-12 Kit
  86. Extra pins on replacement potentiometer for K-12 tube kit?
  87. SRPP - issues understanding how to increase current
  88. ARC Power source+Marantz 7C(PCB edition)
  89. Repair and adjustment tips
  90. trimax output transformer TA2444
  91. anyone recognize this valve?
  92. Microphone Preamp design
  93. 6CM5 hi-fi amplifier
  94. Building an amp try #2
  95. Can the 6S33S/6C33C be mounted horizontally?
  96. A heptode question
  97. Looking for a 807 amp with 4 pairs of 807's
  98. pp output transformer miniblok2
  99. John Swenson's BDT preamp - finally!!
  100. Voice of Music console 816
  101. Steve Bench 1 tube reg in all glass
  102. Conn Caprice 427 needs new 12AU7 tubes—advice?
  103. Position of Iron in Can of HK Citation II Output Transformers
  104. Bottle size,does it matter in matched quads?
  105. Heater Pots?
  106. Current calculation from datasheet
  107. Any one ever seen this amp?
  108. Guiguang 300B for 300Beast.....
  109. FLEA PPP, all ecc99
  110. Well, it is time to start thinking about winter projects. GM70
  111. aghhh is my tube okay?
  112. Grid Bias provided by transformer secondary winding, what is this stuff about?
  113. Zener regulated supplies
  114. OPT fore drive ribbon speaker directly; why not ?
  115. van Dorn's Octode design - recommendations for a 10W/ch version
  116. Outrageous Speaker/Amplifier Idea
  117. Anyone ever made the EL84 P-P circuit referenced on the Tubecad Journal site?
  118. Cathode Follower ideas please.....
  119. Anyone used the NTE1866 VU LED driver?
  120. Any potential problems when using a combo potentiometer / power switch on a K-12 kit?
  121. Help needed understanding component values.
  122. Separate passive pre and monoblocks?
  123. My new diy site
  124. Valves and musical instruments
  125. My DC Darling
  126. Question - add LED power indicator to Aikido pre
  127. Colorful amps
  128. Aikido Cathode Follower
  129. Converting a dirty channel to clean?
  130. A few questions about transformer placement in an S5 K-12 tube amplifer
  131. Bogen AP30 and new member
  132. Echocord Super 62 Feedback at Low Levels?
  133. Direct Coupled 76/5687 linestage
  134. Be kind to your 5AR4 and input capacitor
  135. New Self-Powered ROHS compliant electronic device invented!
  136. Making my first hifi tube amp.
  137. Variation on Rodīs bias servo
  138. "No Light District" P-P amplifier
  139. What kind of tubes do i have?
  140. Understanding Scope Trace Square Wave
  141. Single tube SE with EML-20B
  142. LED bias cathodyne
  143. Diagnosing hum???
  144. Posted tube microphone preamp design
  145. Finally put the Aikido in a proper chassis
  146. Tube Preamp / Headphone amp question...
  147. Phono Preamp
  148. Initial 'DQ5' testing
  149. Free Tube Amplifier Schematic Diagrams
  150. Testing with DMM
  151. The Impressive Vetruvio GM70 SET amp.
  152. 6sn7 subminature??
  153. One channel louder than other
  154. How to use RCP 802A tube tester test B9A tubes?
  155. phono amp question - adding input tx
  156. Ebay "clones" PCB
  157. Phase splitter and balance input
  158. At Last....First Build Complete...6V6/6SL7
  159. Amplifier input
  160. The Tube Maze
  161. Variable Harmonizer
  162. Vetruvio Audio; new competition for the Chinese?
  163. Transmitting tube-driven transmitting tube SET amp?
  164. Circlotron questions
  165. Home Grown tube amps
  166. LT108 Oscillation sounds like tube rush/white noise
  167. Cool looking tubes anyone...
  168. st70 standby switch/cathode stripping SS rect
  169. BoM for an RH84 mono build?
  170. Signal hum ideas please.
  171. E88CC turbo
  172. SRPP vs. plate loaded, musicality and details
  173. 300B/EL156 Amp
  174. Just new one .all new layout.
  175. Am I correct????
  176. Need help identifying this amp...
  177. The Maggie factor
  178. Help wiring up anLED Bar
  179. E810F/7788 Pinout name/number?
  180. Need some help with a mercury 1200 tube checker
  181. Adjust cathode bias pot - both channels move together. Why?
  182. Building a 45 SET
  183. Stereo Pententometer Questions
  184. Looking for oscilloscope recommendations.
  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. Chinise 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. Western Electric settings for Hickok 600A?
  237. Wanted! single-ended 807 schematic
  238. sputtering 5u4 on diy Wheatfield amp
  239. Is this output transformer faulty?
  240. Help identify variac
  241. Schematic for TL Audio VP-5051 Voice Processor
  242. what's a good layout for a quad EL84 amp on this box?
  243. Scott 350B Tuner; Bridge Rectifier
  244. intermitent static pops from speakers st70
  245. baxandall type tone control for diff amp
  246. Stage amps using DHTs
  247. Tube+OP My headphono & preamp
  248. NFB Clarification
  249. James output transformers
  250. I just bought a an old valve amp

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