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  1. Where to buy audio tubes in Europe
  2. Play iPod into 1955 Record Player's Tube Amplifier
  3. To Schade it , or not..
  4. questions on input stage
  5. Planar/Lighthouse triodes for Audio?
  6. The Best coupling cap..THEL??
  7. 211 SET 40W output design and mfg.
  8. Volume Control with Loudness and no Taps
  9. Use for 4k PP (non UL) OPT's?
  10. Filament Autobias
  11. Shelby NC Ham Fest
  12. 2A3 Spud
  13. Resistor as a load
  14. How to balance pushp pull DHT finals
  15. 240v to 220v
  16. Hammond 272 FX plate voltage
  17. Drawing Load Line for Parallel Output Tube
  18. question about swapping el34 for kt77 in my tube amp
  19. 6 volt recifier tubes
  20. Output transformer sizing...again...
  21. Voltage doubler using PSUII?
  22. Rectifier Tubes in SE Amps
  23. 6v6 SEP
  24. 1967 Pioneer SX-34, 11W, WORTH FIXING???
  25. Jumper Wire Gauge and Material for Phono Preamp?
  26. ecc99 - 6C19n PP, (6S19P)
  27. Strange HF distortion
  28. have a pair of 5k:8 OPTs lying around.. suggest me something to build?
  29. Early history of High Fidelity amplifiers
  30. Which pentode for input?
  31. 6n6p or 6P14P-ev for driver
  32. Old tranny - confused with windings
  33. Dynaco A-430 Vintage Output Transformers
  34. Output tube for 800 Ohm speaker?
  35. Today was the anual Tree Street Yard Sale event
  36. Florida ? what did I get ?
  37. 26HU5's vs 26DQ5's
  38. VoltCraft AT-400?
  39. Sonic differences: 45, 2A3, 300B, 845, 211
  40. Need help wiring a pot for cathode adjustment
  41. Sound of the 6SN7?
  42. A mystery device
  43. Plate curves... Ic2 & Ib?
  44. How to choke load for big voltage swings?
  45. 6550 SE design, please comment.
  46. "Impedance" of the output transformer
  47. Triode-wired small signal pentode question
  48. Calculating output impedance
  49. 6JM6 Infomation for Pete Millett's DCPP Amp
  50. Tube labeld ETBB
  51. Heaters wiring help!
  52. Can you send me the Aikido 5687 user manual
  53. Cathode Follower output cap
  54. EL84 rebuild suggestions
  55. voltage divider in WE91 driver
  56. Power Tx Myth?
  57. voltage multiplier based on SS trafo - LONG
  58. What tube for QUIET phono pre??
  59. A&R 8ohm 4008 output transformer
  60. How does DRD Ultrapath Work?
  61. Russian 6H2p-E??
  62. Started work on my stereo 7027a PSE amp
  63. Mono Tube Comp for analog kick drum
  64. Line stage preamplifier
  65. Trying to select the Aikido components
  66. X-PRE musical fidelity preamp. need help modifying
  67. 6C33C & Borbely Question
  68. 12BH7A in common cathode
  69. Sneak Preview: 9 Band Active All Tube EQ
  70. "Universal" octal amplifier?
  71. MU follower - distortion
  72. lighting transformers 12V
  73. Chinese 6N3 preamp questions
  74. Why are Chinese preamp knockoffs so popular?
  75. 4K7 OPT suitable for 6550/KT88?
  76. Transformer question - 110 v and 25 v from 1 secondary?
  77. About loadline again, how to choose load and current
  78. Parallel Output Transformers
  79. 6SN7 / 6V6 power amp : very odd behavour
  80. HV mA Spec on Large RCA Power Xfmr?
  81. Is the Aikido too 'bright'?
  82. Has anyone put the Glassware phono & line amps in same box?
  83. High impedance balanced output: how long the cable?
  84. Data Sheets
  85. Can I use a LM317 bias on lower cathode of SRPP?
  86. AU-34 Output transformer replacement question
  87. The new KT120 from tungsol
  88. em83 questions
  89. Push-pull PCL84 schematic and a question
  90. confused on power transformer ratings
  91. C3g:GM70:GM70 schematic advice
  92. Can someone explain Load Lines?
  93. Humming from WCF but not SRPP
  94. Gas regulator tubes
  95. Lowrey LC1 B schematic wanted
  96. Complete tube amp novice got a few questions!!
  97. jacked up the bias...WOW!
  98. Looking for PP 7027a shematic
  99. So, if it's not DIY Gene, then what?
  100. What driver tube for 200Vrms?
  101. Tube socket purchase
  102. Something I found interesting a while ago!
  103. Eico HF-22 Circuit
  104. SEDHT amp - decisions decisions
  105. Confused with designing
  106. Digitally controlled analog attenuator
  107. Purchased my 1st valve amp and can only get one channel working, please help!
  108. Another silly tube yesting question
  109. potentially very stupid questions....
  110. Tube rectifier: AZ1, AZ31, AZ50 vs 5u4
  111. Tube Square-Law, what and how to set up?
  112. Need help finding schematic. Conn 720
  113. OPT for parafeed SE
  114. Anyone else tried an opamp as a driver?
  115. e180f/6688 pentode operting points
  116. power supply reassignment problem
  117. Mains power transformer on S5 K-12 kit hums?
  118. Oriole OPT
  119. 26DQ5's vs 26HU5's vs 6KN6's and transformers
  120. SRPP power using power tranny as OPT?
  121. Need guidance with heathkit SA-2 refurbish/mods
  122. B+ discharge times!
  123. 26HU5's....and a confession
  124. Bell Sound Systems Pacemaker Model 2220
  125. Any thoughts on this transformer on eBay?
  126. Need some help figuring out a Wurlitzer 6240.
  127. Bypassing cathode resistor on pp power tube
  128. TRIODE Voltage amp + Power OP output follower
  129. Cats and tube-a-holics
  130. Replace Tube Rectifier With Weber CC?
  131. 717a 2 stage SE amplifier
  132. Thoughts on Oatley K282 Valve Preamp?
  133. SS rectifier for SimpleSE and others...
  134. Need match Pr KT-88
  135. EL34 PP - again !!!
  136. S5 K-12 Kit sounds excellent with iPod, but relatively low volume with turntable?
  137. Finished K-12 Kit with cedar / brass chassis (pics)
  138. Tubes HOT!
  139. Meng volume pot problem
  140. Use P-P OPT for SE?
  141. Safety ?
  142. 851 set?
  143. dual cathode follower problem
  144. Question about connecting grounds
  145. Is it okay for capacitors to be close to the main power transformer in S5 K-12 Kit?
  146. Fisher 500C Schematic
  147. looking for PP 6l6 schematic
  148. Muiscal Paradise MP-301 6V6 amp.
  149. First Build - PS Voltage Question?
  150. Need help about an hybrid amp circuit
  151. Pioneer SX-348 - Service manual?
  152. Tube PS for mic preamp Help
  153. Add rectifier tube to yaqin mc10l? What size is best?
  154. global negative feedback schematic
  155. Signal transformer question
  156. What speaker system for tube amplifier
  157. 39/44 Tube
  158. tube-aholics anonymous ?
  159. 12AX7 heaters from 9VAC transformer
  160. Cant stop Aikido Humming
  161. Question about potential transformer placement in K-12 Kit
  162. Extra pins on replacement potentiometer for K-12 tube kit?
  163. SRPP - issues understanding how to increase current
  164. ARC Power source+Marantz 7C(PCB edition)
  165. Repair and adjustment tips
  166. trimax output transformer TA2444
  167. anyone recognize this valve?
  168. Microphone Preamp design
  169. 6CM5 hi-fi amplifier
  170. Building an amp try #2
  171. Can the 6S33S/6C33C be mounted horizontally?
  172. A heptode question
  173. Looking for a 807 amp with 4 pairs of 807's
  174. pp output transformer miniblok2
  175. John Swenson's BDT preamp - finally!!
  176. Voice of Music console 816
  177. Steve Bench 1 tube reg in all glass
  178. Conn Caprice 427 needs new 12AU7 tubes—advice?
  179. Position of Iron in Can of HK Citation II Output Transformers
  180. Bottle size,does it matter in matched quads?
  181. Heater Pots?
  182. Current calculation from datasheet
  183. Any one ever seen this amp?
  184. Guiguang 300B for 300Beast.....
  185. FLEA PPP, all ecc99
  186. Well, it is time to start thinking about winter projects. GM70
  187. aghhh is my tube okay?
  188. Grid Bias provided by transformer secondary winding, what is this stuff about?
  189. Zener regulated supplies
  190. OPT fore drive ribbon speaker directly; why not ?
  191. van Dorn's Octode design - recommendations for a 10W/ch version
  192. Outrageous Speaker/Amplifier Idea
  193. Anyone ever made the EL84 P-P circuit referenced on the Tubecad Journal site?
  194. Cathode Follower ideas please.....
  195. Anyone used the NTE1866 VU LED driver?
  196. Any potential problems when using a combo potentiometer / power switch on a K-12 kit?
  197. Help needed understanding component values.
  198. Separate passive pre and monoblocks?
  199. My new diy site
  200. Valves and musical instruments
  201. My DC Darling
  202. Question - add LED power indicator to Aikido pre
  203. Colorful amps
  204. Aikido Cathode Follower
  205. Converting a dirty channel to clean?
  206. A few questions about transformer placement in an S5 K-12 tube amplifer
  207. Bogen AP30 and new member
  208. Echocord Super 62 Feedback at Low Levels?
  209. Direct Coupled 76/5687 linestage
  210. Be kind to your 5AR4 and input capacitor
  211. New Self-Powered ROHS compliant electronic device invented!
  212. Making my first hifi tube amp.
  213. Variation on Rodīs bias servo
  214. "No Light District" P-P amplifier
  215. What kind of tubes do i have?
  216. Understanding Scope Trace Square Wave
  217. Single tube SE with EML-20B
  218. LED bias cathodyne
  219. Diagnosing hum???
  220. Posted tube microphone preamp design
  221. Finally put the Aikido in a proper chassis
  222. Tube Preamp / Headphone amp question...
  223. Phono Preamp
  224. Initial 'DQ5' testing
  225. Free Tube Amplifier Schematic Diagrams
  226. Testing with DMM
  227. The Impressive Vetruvio GM70 SET amp.
  228. 6sn7 subminature??
  229. One channel louder than other
  230. phono amp question - adding input tx
  231. Ebay "clones" PCB
  232. Phase splitter and balance input
  233. At Last....First Build Complete...6V6/6SL7
  234. Amplifier input
  235. The Tube Maze
  236. Variable Harmonizer
  237. Vetruvio Audio; new competition for the Chinese?
  238. Transmitting tube-driven transmitting tube SET amp?
  239. Circlotron questions
  240. Home Grown tube amps
  241. LT108 Oscillation sounds like tube rush/white noise
  242. Cool looking tubes anyone...
  243. st70 standby switch/cathode stripping SS rect
  244. BoM for an RH84 mono build?
  245. Signal hum ideas please.
  246. E88CC turbo
  247. SRPP vs. plate loaded, musicality and details
  248. 300B/EL156 Amp
  249. Just new one .all new layout.
  250. Am I correct????

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