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  1. About loadline again, how to choose load and current
  2. Parallel Output Transformers
  3. 6SN7 / 6V6 power amp : very odd behavour
  4. HV mA Spec on Large RCA Power Xfmr?
  5. Is the Aikido too 'bright'?
  6. Has anyone put the Glassware phono & line amps in same box?
  7. High impedance balanced output: how long the cable?
  8. Data Sheets
  9. Can I use a LM317 bias on lower cathode of SRPP?
  10. AU-34 Output transformer replacement question
  11. The new KT120 from tungsol
  12. em83 questions
  13. Push-pull PCL84 schematic and a question
  14. confused on power transformer ratings
  15. C3g:GM70:GM70 schematic advice
  16. Can someone explain Load Lines?
  17. Humming from WCF but not SRPP
  18. Gas regulator tubes
  19. My B&K 707 sensitivity seems wonky
  20. Lowrey LC1 B schematic wanted
  21. Complete tube amp novice got a few questions!!
  22. jacked up the bias...WOW!
  23. Looking for PP 7027a shematic
  24. So, if it's not DIY Gene, then what?
  25. What driver tube for 200Vrms?
  26. Tube socket purchase
  27. Something I found interesting a while ago!
  28. Eico HF-22 Circuit
  29. SEDHT amp - decisions decisions
  30. Confused with designing
  31. Digitally controlled analog attenuator
  32. Purchased my 1st valve amp and can only get one channel working, please help!
  33. Another silly tube yesting question
  34. potentially very stupid questions....
  35. Tube rectifier: AZ1, AZ31, AZ50 vs 5u4
  36. Tube Square-Law, what and how to set up?
  37. Need help finding schematic. Conn 720
  38. OPT for parafeed SE
  39. Anyone else tried an opamp as a driver?
  40. e180f/6688 pentode operting points
  41. power supply reassignment problem
  42. Mains power transformer on S5 K-12 kit hums?
  43. Oriole OPT
  44. 26DQ5's vs 26HU5's vs 6KN6's and transformers
  45. SRPP power using power tranny as OPT?
  46. Need guidance with heathkit SA-2 refurbish/mods
  47. B+ discharge times!
  48. 26HU5's....and a confession
  49. Bell Sound Systems Pacemaker Model 2220
  50. Any thoughts on this transformer on eBay?
  51. Need some help figuring out a Wurlitzer 6240.
  52. Bypassing cathode resistor on pp power tube
  53. Is it safe to use a 8BQ5 in place of a 6BQ5 in a guitar amp?
  54. TRIODE Voltage amp + Power OP output follower
  55. Cats and tube-a-holics
  56. Replace Tube Rectifier With Weber CC?
  57. 717a 2 stage SE amplifier
  58. Thoughts on Oatley K282 Valve Preamp?
  59. SS rectifier for SimpleSE and others...
  60. Need match Pr KT-88
  61. EL34 PP - again !!!
  62. S5 K-12 Kit sounds excellent with iPod, but relatively low volume with turntable?
  63. Finished K-12 Kit with cedar / brass chassis (pics)
  64. Groove Tube Dual 75 schematics
  65. Tubes HOT!
  66. Meng volume pot problem
  67. Use P-P OPT for SE?
  68. Safety ?
  69. Film caps always better than lytics?
  70. Valve Preamp for voice / guitar purpose
  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. Radio to guitaramp conversion hum problem
  81. Pioneer SX-348 - Service manual?
  82. Tube PS for mic preamp Help
  83. Add rectifier tube to yaqin mc10l? What size is best?
  84. global negative feedback schematic
  85. Signal transformer question
  86. What speaker system for tube amplifier
  87. 39/44 Tube
  88. tube-aholics anonymous ?
  89. 12AX7 heaters from 9VAC transformer
  90. Cant stop Aikido Humming
  91. Suggestions for rotary switches
  92. Question about potential transformer placement in K-12 Kit
  93. Extra pins on replacement potentiometer for K-12 tube kit?
  94. Instrument tube / valve preamp
  95. SRPP - issues understanding how to increase current
  96. ARC Power source+Marantz 7C(PCB edition)
  97. Repair and adjustment tips
  98. trimax output transformer TA2444
  99. anyone recognize this valve?
  100. Microphone Preamp design
  101. 6CM5 hi-fi amplifier
  102. Building an amp try #2
  103. Can the 6S33S/6C33C be mounted horizontally?
  104. A heptode question
  105. Looking for a 807 amp with 4 pairs of 807's
  106. pp output transformer miniblok2
  107. John Swenson's BDT preamp - finally!!
  108. Voice of Music console 816
  109. Steve Bench 1 tube reg in all glass
  110. Conn Caprice 427 needs new 12AU7 tubes—advice?
  111. Position of Iron in Can of HK Citation II Output Transformers
  112. Bottle size,does it matter in matched quads?
  113. Heater Pots?
  114. Current calculation from datasheet
  115. Any one ever seen this amp?
  116. Guiguang 300B for 300Beast.....
  117. FLEA PPP, all ecc99
  118. Well, it is time to start thinking about winter projects. GM70
  119. aghhh is my tube okay?
  120. Grid Bias provided by transformer secondary winding, what is this stuff about?
  121. Zener regulated supplies
  122. OPT fore drive ribbon speaker directly; why not ?
  123. van Dorn's Octode design - recommendations for a 10W/ch version
  124. Outrageous Speaker/Amplifier Idea
  125. Anyone ever made the EL84 P-P circuit referenced on the Tubecad Journal site?
  126. Scratchy volume pot on TAD DIY deluxe reverb
  127. Cathode Follower ideas please.....
  128. Anyone used the NTE1866 VU LED driver?
  129. Any potential problems when using a combo potentiometer / power switch on a K-12 kit?
  130. Help needed understanding component values.
  131. Separate passive pre and monoblocks?
  132. My new diy site
  133. Valves and musical instruments
  134. My DC Darling
  135. Question - add LED power indicator to Aikido pre
  136. Colorful amps
  137. Aikido Cathode Follower
  138. Converting a dirty channel to clean?
  139. A few questions about transformer placement in an S5 K-12 tube amplifer
  140. Bogen AP30 and new member
  141. Adding Clean channel to AX84 P1-Ex
  142. Echocord Super 62 Feedback at Low Levels?
  143. Direct Coupled 76/5687 linestage
  144. Be kind to your 5AR4 and input capacitor
  145. New Self-Powered ROHS compliant electronic device invented!
  146. Making my first hifi tube amp.
  147. Variation on Rodīs bias servo
  148. "No Light District" P-P amplifier
  149. What kind of tubes do i have?
  150. Understanding Scope Trace Square Wave
  151. Single tube SE with EML-20B
  152. LED bias cathodyne
  153. Diagnosing hum???
  154. Posted tube microphone preamp design
  155. Finally put the Aikido in a proper chassis
  156. Tube Preamp / Headphone amp question...
  157. Phono Preamp
  158. Initial 'DQ5' testing
  159. Free Tube Amplifier Schematic Diagrams
  160. Testing with DMM
  161. The Impressive Vetruvio GM70 SET amp.
  162. Fender Twin Reverb channel 2 has no output
  163. 6sn7 subminature??
  164. One channel louder than other
  165. How to use RCP 802A tube tester test B9A tubes?
  166. phono amp question - adding input tx
  167. Ebay "clones" PCB
  168. Phase splitter and balance input
  169. At Last....First Build Complete...6V6/6SL7
  170. Amplifier input
  171. The Tube Maze
  172. Variable Harmonizer
  173. Vetruvio Audio; new competition for the Chinese?
  174. Transmitting tube-driven transmitting tube SET amp?
  175. Circlotron questions
  176. Home Grown tube amps
  177. LT108 Oscillation sounds like tube rush/white noise
  178. Cool looking tubes anyone...
  179. st70 standby switch/cathode stripping SS rect
  180. BoM for an RH84 mono build?
  181. Signal hum ideas please.
  182. E88CC turbo
  183. SRPP vs. plate loaded, musicality and details
  184. 300B/EL156 Amp
  185. Just new one .all new layout.
  186. Am I correct????
  187. Need help identifying this amp...
  188. The Maggie factor
  189. Help wiring up anLED Bar
  190. E810F/7788 Pinout name/number?
  191. Need some help with a mercury 1200 tube checker
  192. Adjust cathode bias pot - both channels move together. Why?
  193. Building a 45 SET
  194. Stereo Pententometer Questions
  195. Looking for oscilloscope recommendations.
  196. dm160 magic eye help
  197. Tube stage for acoustic guitar?
  198. Zener heater regulator
  199. Dead Time - Correcting for it
  200. ARC Power source+ 12AX7&12AU7 Pre-amplifier
  201. PTC Thermistor for auto fixed bias
  202. How do I calculate output power?
  203. Microcontrollers in tube amps
  204. Dynaco PAT4/Aikido tube preamp
  205. RCA red base 5691 / 5692
  206. Updating my amps....and "hello" :-)
  207. my first attempt
  208. Finished my first PP amp, 6SJ7-6SN7-6v6
  209. Triode PP OP stage combining Blumlein Garter and CCS bias - anyone tried this?
  210. 6U8 Revisited
  211. DePalma redux
  212. Could this be a perfectly linear triode?
  213. Grounding elevated ccs series filament supply
  214. What to do with E182CC's
  215. Angela EL34 opinions please
  216. Chinise 6N1 tube replacement
  217. Ridiculous Hallucinations
  218. Transformer Ratings
  219. dB Meter with tube circuit
  220. Suggestions for pp or se monos
  221. Low filament current tubes
  222. Tube Clearout
  223. First tube amp, it needs maintenance
  224. Need EF86 phono preamplifier shematic
  225. cannot locate documentation on SCA 9190 receiver
  226. Ecc88 pin 9 connection??
  227. VTL Compact100 Monoblock Blows Fuse
  228. 300b driver revisited.
  229. SYclotron schematic
  230. Hum problem
  231. Suppo el34
  232. my new tube experience
  233. LL1682PP Lundahl
  234. BP Ultrapath
  235. Tube shops/sellers in Kiev , Ukraine ?
  236. Headphones with tubes...
  237. A Triad xfmr for a voltage doubler PSU
  238. Ra-100
  239. Series Resistors on Outputs of Transformer?
  240. what's up !? new choke=subsonic pumping
  241. How to get the best out of the 6C33C-B?
  242. TO-220 PCB spacing for HV MOSFETs
  243. Deluxe Reverb Clone too "throaty"
  244. Using a Dynaco ST-70 audio transformer for a guitar amp
  245. Need input on Buffer stage to use in Preamp..
  246. quad output tube help
  247. "Stacking" power transformer secondaries?
  248. Tubes flare on start up!!
  249. Solid state rectifier for AC30 clone
  250. Grid Stopper Advice - Graphs Included!

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