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  1. Ask Jan First OPTs
  2. For what are high mu triodes still useful?
  3. CCa "low noise"?
  4. Upgrading my Audio Research VT 130 SE Tube amp
  5. 100ma FSD voltmeter
  6. Conqueror schematic
  7. Bassman 135 OT
  8. Ground reference
  9. Overdriven Capacitor?
  10. Tone Controls?
  11. My first "from scratch" design, SE KT88..........
  12. OPTs of questionable utility
  13. 6336 as a Rectifier
  14. tube power supply
  15. Anyone read Russian?
  16. PSU - dropping resistors?
  17. pre-amp design, just curious about your thoughts here.
  18. Using isolation transformer as a PSU transformer???
  19. KT66 loosing its getter
  20. Mullard schematic?
  21. Mikale Abdellah SE KT88 B+ voltage?
  22. Layout software
  23. Does anyone have any schematics for a parafeed SET amp?
  24. music angel kt88
  25. CB radio
  26. The end of the 300b Dream?
  27. Voltage divider to reduce 6v dc to 2vdc
  28. oil injected rca cables?
  29. Modification.....
  30. CHOKY'S EC8010 preamp
  31. Using a Grid Choke On the 2A3 when the input/driver is a Pentode?
  32. tube checker
  33. 300B tube going dead after a few months
  34. KT88 se build NO GAIN please help
  35. mengyue mini valve amplifier
  36. Preamp suggest, please.
  37. Problem: Severe power transformer and choke vibration
  38. Amp Hack schematic questions
  39. This circuit ok?
  40. Tube ID anyone?
  41. Posted new books and data
  42. The sound of a failing tube rectifier?
  43. Proyect with PL36 and N2P (Russian ECC83)
  44. 300b LTspice model with grid current?
  45. Tri-amp using 2a3 SETs
  46. TentLabs Directly Heated Tubes Supply
  47. Bevois Valley Design Question
  48. Kofi Annan in: "Oscillation Blues"
  49. Common mode choke model
  50. UTC 20 Watt Amp - Any Experience?
  51. 6cz5s for EL84s
  52. The 120Hz Blues...
  53. Amplitrex AT-1000 Tube Tester
  54. audio amp. versus guitar amp
  55. Grounding points....
  56. Cap values for CLC filter
  57. Tube glows red hot, blows fuse
  58. Independent Bias Adjust for Each Tube?
  59. Mesa Boogie Maverick schematic any1?
  60. KT-88 from a book
  61. Modelling PSU?!
  62. DD amp for ESLs...
  63. Today's tube manufacters, best is?
  64. Advice on hum in phono stage
  65. Cathode follower & SRPP q
  66. FREDs on PSU
  67. Hybrid Shenanigans
  68. How hard is it to rewire my amp from 6av6/6cg7 to just 12ax7 types?
  69. 5AR4 heaters
  70. Bad Grounding,or Cheap Pot??
  71. Tube Construction Handbook
  72. WE 350: dry bass?
  73. What size capacitor I use for a 2A3 or 300B cathode bypass?
  74. Need helps with building poweramp stage
  75. Noah's Ark for electron tubes
  76. Fixed Bias suggestions
  77. OD3/OA3 voltage regulation design
  78. DHT filament heating with SMPS + CCS
  79. Using SE transformers in a PP circuit
  80. EDCOR Releases Line of Guitar OPT's
  81. Schematic: Audio Innovations, The first audio amplifier
  82. Restoring 1948 Gibson GA-30 guitar amp(tube)
  83. Now THIS is tube DIY to the extreme
  84. Dynaco mkIII A431 op's
  85. Alternative to Power Transformer
  86. Help with e180f and ixys current reg
  87. Building a "Hiwatt" tube Bass Amp
  88. help! no power, im lost
  89. Jerrycan amp (RH34SE)
  90. 12B4 Updates
  91. www.diykits.com.hk stepped volume control ... any good?
  92. Hammond L-100 conversion
  93. Anyone have the ASL model MGSI15 schematic ?
  94. Replacement for single-winding OPT?
  95. Buzz in new amp...
  96. 48V B+ linestage
  97. Line-Stage Opinion Question
  98. Audio applications of sweep tubes and ratings
  99. Differences in structure between parafeed ad gapped OPTs
  100. Take a look and let me know what you think
  101. Printed circuit board designing?
  102. SimpleSE - Switches, Wire, IEC, Jacks
  103. KT90 why this ?
  104. Break in
  105. Choke Design - Basic Questions
  106. Is this a good interstage transformer?
  107. Best tubes for bass?
  108. Tube amps & MP3's
  109. TRIO 15Hz Oscilloscope CS-1560A
  110. Newbie Needs Help Choosing A Kit
  111. I need a negative supply rail--but how?
  112. Strange Hum
  113. VR Tubes
  114. Understanding plate loads
  115. How do you know if your preamp has inverted the phase?
  116. Bogen J130 PA to guitar amp?
  117. 6P1 Equivalent
  118. EL34 and KT88??? 6550?
  119. one stage DHT amp
  120. 6V6 Output?
  121. Lineup of four: Help me choose?! OPT for SE
  122. 6DJ8 / 6922 tube?
  123. bias pilot sa 260
  124. Using vintage OPTs as PSU chokes ?
  125. crystal palace driver stage by morgan jones
  126. Why Are 12A*7 Tubes So Bad?
  127. Mikael's KT-88 question
  128. OPT for PSE 6c33c tubes
  129. 24v aikido distortion
  130. ED8000 SE or Parafeed?
  131. GZ33 Rectifier drop?
  132. counterpoint sa11
  133. High voltage problem
  134. Wire gauges
  135. Simple headphones out
  136. Mull(ard)ing over valve choice...
  137. Turning on B+ without heaters with aikido
  138. New Project - Plitron 4006
  139. Where in Brisbane can I get a transformer for my Chinese amp
  140. Etching or silkscreening chassis?
  141. can please someone explain this to me?
  142. A VCCS tube amp, how?
  143. How to add a subwoofer out?
  144. Kind of cool check it out
  145. new opt for s5 k16ls?
  146. Wanted Arkay SP6, Knight 83YX768 schematics
  147. toggle switch for input selector
  148. Tube Rectifier protection
  149. Quick Q on Max G2/Screen Volts..
  150. Cathodyne follower? :)
  151. Real music power
  152. Tube info needed
  153. Petrol Head Amp
  154. Help Needed- Replacement Volume Pot For a Fisher KX100
  155. What are these caps good for?
  156. 300B Set amp some variations
  157. my second design circuit(hifhgain guitar amp)
  158. why p-p amp RL for class B is 1/2 the class A load?
  159. Is this circuit ok?
  160. JTM60 capacitor question
  161. Attenuators ------ Please Help
  162. Transformer Coupled Pentode Question
  163. no response needed 903@klipschorns
  164. KT88: EH vs. Winged C
  165. Voltage swing on a guitar pick-up?
  166. Anyone have experience with the China made tube amps
  167. tubelab SE 300b power transformer
  168. Toroidal transformer potting can
  169. 300B - Push Pull or PSE to drive a commercial speaker
  170. Consonance Ella Diy hifi supply, el34, 6550 or KT88?
  171. Choke Input Filter.
  172. Preamp comparisons
  173. Amperite delay relays
  174. Help with making a tube amp?
  175. Linestage suggestion for Kuei Yang Wang's phonostage
  176. Altec Lansing 440B preamplifier
  177. Modding a Bogen CHB100...
  178. Report: One-Electron PRC as input choke
  179. Phase Splitter Name
  180. 6ck4 sweetspot
  181. Mystery Ebay amp purchase
  182. Triode versus Pentode
  183. Supply, Full wave, choke on center tap?
  184. Ping SY
  185. Interstage Transformer Loading
  186. Tube Amplifier Kit?
  187. Easy inexpensive tube buffer ideas?
  188. Running tubes at their maximum dissipation.
  189. 6BM8/ Heathkkit S.88 Has only 3 and 15 ohm O/P..?
  190. DHT drivers - shootout
  191. Dynaco MK IV
  192. Fender Bassman- AB165 capacitor toss up
  193. KT88 , Genalex or Chinese ? Help !!!
  194. output tubes for stereo 70
  195. 6H6P for Sonic Frontiers Line 2?
  196. Too much distortion
  197. Servo assisted CF LCR-filter
  198. 6v 5AR4?
  199. 845 Grid stopper value
  200. Chokes, sizing and ringing?
  201. Long tail 6sl7 for Dynaco stereo 70?
  202. Triode Fabrication Video
  203. Funny Hi-Fi quote
  204. 300B PP ph.split
  205. extend tube sockets, or tube "plugs"?
  206. Klipsch Promedia GMX A-2.1 + Decware Taboo
  207. So any ideas for a car type amp?
  208. Cathode Biasing a 6L6 quartet power stage
  209. Calling All Mullard 5-20 Aficionados
  210. Modelling a DC filament supply in PSU Designer II
  211. Guitar Preamp Tube combination
  212. 12AX7 Preamp NOOB Question
  213. Adding aux input on a tube console
  214. one safety question
  215. E1148,CV6-How do you distinguish the anode/grid caps?
  216. dual value motor run caps
  217. Strange DC choke behavior
  218. Subwoofer out question.
  219. Tube 6N3 use pre for ChipAmp
  220. Hammond 1650W
  221. separating PSU for preamp
  222. sca-35
  223. A 6.3V regulator delivering 2.8A...?
  224. 6K:8 25W SE OPT, now what tube should I use?
  225. EL84 fixed bias PP Triode
  226. Tube Amp Kit Suggestions
  227. TT21 Vs KT88
  228. One-Electron PRC chokes as PS input choke?
  229. Magnavox 135BB
  230. Is there much point in tube preamps? (This isn't a troll)
  231. How does one determine saturation point of triode or pentode
  232. Help - 807 Technical problem
  233. woooohooo!!! 3 working el84 SEs
  234. westinghouse model 80 radio - eval for parts?
  235. Bogen J130 PA schematic
  236. Marshall JMP-1 high voltage value ??
  237. Better Cap = Better Sound?
  238. Pilot SA 260 bias
  239. 12AX7 gain stage output impedance
  240. Small 1W hifi amp
  241. Tube Radio - What are G & F Terminals?
  242. Has anyone seen this?
  243. how would you Parallel a 12ua7 tube
  244. Tube mod a HT rcvr?
  245. how would i series a 12au7a
  246. does some have distortion schematics for 12au7a
  247. triode strapped tetrode
  248. 6F6G UL Amplifier
  249. Build a VT100?
  250. turrets for tube PC driver board needed

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