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  1. Use for 4k PP (non UL) OPT's?
  2. Filament Autobias
  3. Shelby NC Ham Fest
  4. 2A3 Spud
  5. Resistor as a load
  6. How to balance pushp pull DHT finals
  7. 240v to 220v
  8. Hammond 272 FX plate voltage
  9. Drawing Load Line for Parallel Output Tube
  10. question about swapping el34 for kt77 in my tube amp
  11. 6 volt recifier tubes
  12. Output transformer sizing...again...
  13. Voltage doubler using PSUII?
  14. Rectifier Tubes in SE Amps
  15. 6v6 SEP
  16. 1967 Pioneer SX-34, 11W, WORTH FIXING???
  17. Jumper Wire Gauge and Material for Phono Preamp?
  18. ecc99 - 6C19n PP, (6S19P)
  19. Strange HF distortion
  20. have a pair of 5k:8 OPTs lying around.. suggest me something to build?
  21. Early history of High Fidelity amplifiers
  22. Which pentode for input?
  23. 6n6p or 6P14P-ev for driver
  24. Old tranny - confused with windings
  25. Dynaco A-430 Vintage Output Transformers
  26. Output tube for 800 Ohm speaker?
  27. Today was the anual Tree Street Yard Sale event
  28. Florida ? what did I get ?
  29. 26HU5's vs 26DQ5's
  30. VoltCraft AT-400?
  31. Sonic differences: 45, 2A3, 300B, 845, 211
  32. Need help wiring a pot for cathode adjustment
  33. Sound of the 6SN7?
  34. A mystery device
  35. Plate curves... Ic2 & Ib?
  36. How to choke load for big voltage swings?
  37. 6550 SE design, please comment.
  38. "Impedance" of the output transformer
  39. Triode-wired small signal pentode question
  40. Calculating output impedance
  41. 6JM6 Infomation for Pete Millett's DCPP Amp
  42. Tube labeld ETBB
  43. Heaters wiring help!
  44. Can you send me the Aikido 5687 user manual
  45. Cathode Follower output cap
  46. EL84 rebuild suggestions
  47. voltage divider in WE91 driver
  48. Power Tx Myth?
  49. voltage multiplier based on SS trafo - LONG
  50. What tube for QUIET phono pre??
  51. A&R 8ohm 4008 output transformer
  52. How does DRD Ultrapath Work?
  53. Russian 6H2p-E??
  54. Started work on my stereo 7027a PSE amp
  55. Mono Tube Comp for analog kick drum
  56. Line stage preamplifier
  57. Trying to select the Aikido components
  58. X-PRE musical fidelity preamp. need help modifying
  59. 6C33C & Borbely Question
  60. 12BH7A in common cathode
  61. Sneak Preview: 9 Band Active All Tube EQ
  62. "Universal" octal amplifier?
  63. MU follower - distortion
  64. lighting transformers 12V
  65. Chinese 6N3 preamp questions
  66. Why are Chinese preamp knockoffs so popular?
  67. 4K7 OPT suitable for 6550/KT88?
  68. Transformer question - 110 v and 25 v from 1 secondary?
  69. About loadline again, how to choose load and current
  70. Parallel Output Transformers
  71. 6SN7 / 6V6 power amp : very odd behavour
  72. HV mA Spec on Large RCA Power Xfmr?
  73. Is the Aikido too 'bright'?
  74. Has anyone put the Glassware phono & line amps in same box?
  75. High impedance balanced output: how long the cable?
  76. Data Sheets
  77. Can I use a LM317 bias on lower cathode of SRPP?
  78. AU-34 Output transformer replacement question
  79. The new KT120 from tungsol
  80. em83 questions
  81. Push-pull PCL84 schematic and a question
  82. confused on power transformer ratings
  83. C3g:GM70:GM70 schematic advice
  84. Can someone explain Load Lines?
  85. Humming from WCF but not SRPP
  86. Gas regulator tubes
  87. Lowrey LC1 B schematic wanted
  88. Complete tube amp novice got a few questions!!
  89. jacked up the bias...WOW!
  90. Looking for PP 7027a shematic
  91. So, if it's not DIY Gene, then what?
  92. What driver tube for 200Vrms?
  93. Tube socket purchase
  94. Something I found interesting a while ago!
  95. Eico HF-22 Circuit
  96. SEDHT amp - decisions decisions
  97. Confused with designing
  98. Digitally controlled analog attenuator
  99. Purchased my 1st valve amp and can only get one channel working, please help!
  100. Another silly tube yesting question
  101. potentially very stupid questions....
  102. Tube rectifier: AZ1, AZ31, AZ50 vs 5u4
  103. Tube Square-Law, what and how to set up?
  104. Need help finding schematic. Conn 720
  105. OPT for parafeed SE
  106. Anyone else tried an opamp as a driver?
  107. e180f/6688 pentode operting points
  108. power supply reassignment problem
  109. Mains power transformer on S5 K-12 kit hums?
  110. Oriole OPT
  111. 26DQ5's vs 26HU5's vs 6KN6's and transformers
  112. SRPP power using power tranny as OPT?
  113. Need guidance with heathkit SA-2 refurbish/mods
  114. B+ discharge times!
  115. 26HU5's....and a confession
  116. Bell Sound Systems Pacemaker Model 2220
  117. Any thoughts on this transformer on eBay?
  118. Need some help figuring out a Wurlitzer 6240.
  119. Bypassing cathode resistor on pp power tube
  120. TRIODE Voltage amp + Power OP output follower
  121. Cats and tube-a-holics
  122. Replace Tube Rectifier With Weber CC?
  123. 717a 2 stage SE amplifier
  124. Thoughts on Oatley K282 Valve Preamp?
  125. SS rectifier for SimpleSE and others...
  126. Need match Pr KT-88
  127. EL34 PP - again !!!
  128. S5 K-12 Kit sounds excellent with iPod, but relatively low volume with turntable?
  129. Finished K-12 Kit with cedar / brass chassis (pics)
  130. Tubes HOT!
  131. Use P-P OPT for SE?
  132. Safety ?
  133. 851 set?
  134. dual cathode follower problem
  135. Question about connecting grounds
  136. Is it okay for capacitors to be close to the main power transformer in S5 K-12 Kit?
  137. Fisher 500C Schematic
  138. looking for PP 6l6 schematic
  139. Muiscal Paradise MP-301 6V6 amp.
  140. First Build - PS Voltage Question?
  141. Need help about an hybrid amp circuit
  142. Pioneer SX-348 - Service manual?
  143. Tube PS for mic preamp Help
  144. Add rectifier tube to yaqin mc10l? What size is best?
  145. global negative feedback schematic
  146. Signal transformer question
  147. What speaker system for tube amplifier
  148. 39/44 Tube
  149. tube-aholics anonymous ?
  150. 12AX7 heaters from 9VAC transformer
  151. Cant stop Aikido Humming
  152. Question about potential transformer placement in K-12 Kit
  153. Extra pins on replacement potentiometer for K-12 tube kit?
  154. SRPP - issues understanding how to increase current
  155. ARC Power source+Marantz 7C(PCB edition)
  156. Repair and adjustment tips
  157. trimax output transformer TA2444
  158. anyone recognize this valve?
  159. Microphone Preamp design
  160. 6CM5 hi-fi amplifier
  161. Building an amp try #2
  162. Can the 6S33S/6C33C be mounted horizontally?
  163. A heptode question
  164. Looking for a 807 amp with 4 pairs of 807's
  165. pp output transformer miniblok2
  166. John Swenson's BDT preamp - finally!!
  167. Voice of Music console 816
  168. Steve Bench 1 tube reg in all glass
  169. Conn Caprice 427 needs new 12AU7 tubes—advice?
  170. Position of Iron in Can of HK Citation II Output Transformers
  171. Bottle size,does it matter in matched quads?
  172. Heater Pots?
  173. Current calculation from datasheet
  174. Any one ever seen this amp?
  175. Guiguang 300B for 300Beast.....
  176. FLEA PPP, all ecc99
  177. Well, it is time to start thinking about winter projects. GM70
  178. aghhh is my tube okay?
  179. Grid Bias provided by transformer secondary winding, what is this stuff about?
  180. Zener regulated supplies
  181. OPT fore drive ribbon speaker directly; why not ?
  182. van Dorn's Octode design - recommendations for a 10W/ch version
  183. Outrageous Speaker/Amplifier Idea
  184. Anyone ever made the EL84 P-P circuit referenced on the Tubecad Journal site?
  185. Cathode Follower ideas please.....
  186. Anyone used the NTE1866 VU LED driver?
  187. Any potential problems when using a combo potentiometer / power switch on a K-12 kit?
  188. Help needed understanding component values.
  189. Separate passive pre and monoblocks?
  190. My new diy site
  191. Valves and musical instruments
  192. My DC Darling
  193. Question - add LED power indicator to Aikido pre
  194. Colorful amps
  195. Aikido Cathode Follower
  196. Converting a dirty channel to clean?
  197. A few questions about transformer placement in an S5 K-12 tube amplifer
  198. Bogen AP30 and new member
  199. Echocord Super 62 Feedback at Low Levels?
  200. Direct Coupled 76/5687 linestage
  201. Be kind to your 5AR4 and input capacitor
  202. New Self-Powered ROHS compliant electronic device invented!
  203. Making my first hifi tube amp.
  204. Variation on Rodīs bias servo
  205. "No Light District" P-P amplifier
  206. What kind of tubes do i have?
  207. Single tube SE with EML-20B
  208. LED bias cathodyne
  209. Diagnosing hum???
  210. Posted tube microphone preamp design
  211. Finally put the Aikido in a proper chassis
  212. Tube Preamp / Headphone amp question...
  213. Phono Preamp
  214. Initial 'DQ5' testing
  215. Free Tube Amplifier Schematic Diagrams
  216. The Impressive Vetruvio GM70 SET amp.
  217. 6sn7 subminature??
  218. One channel louder than other
  219. phono amp question - adding input tx
  220. Ebay "clones" PCB
  221. Phase splitter and balance input
  222. At Last....First Build Complete...6V6/6SL7
  223. Amplifier input
  224. The Tube Maze
  225. Variable Harmonizer
  226. Vetruvio Audio; new competition for the Chinese?
  227. Transmitting tube-driven transmitting tube SET amp?
  228. Circlotron questions
  229. Home Grown tube amps
  230. LT108 Oscillation sounds like tube rush/white noise
  231. Cool looking tubes anyone...
  232. st70 standby switch/cathode stripping SS rect
  233. BoM for an RH84 mono build?
  234. Signal hum ideas please.
  235. E88CC turbo
  236. SRPP vs. plate loaded, musicality and details
  237. 300B/EL156 Amp
  238. Just new one .all new layout.
  239. Am I correct????
  240. Need help identifying this amp...
  241. The Maggie factor
  242. Help wiring up anLED Bar
  243. E810F/7788 Pinout name/number?
  244. Adjust cathode bias pot - both channels move together. Why?
  245. Building a 45 SET
  246. Stereo Pententometer Questions
  247. dm160 magic eye help
  248. Zener heater regulator
  249. Dead Time - Correcting for it
  250. ARC Power source+ 12AX7&12AU7 Pre-amplifier

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