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  1. Sophia Electric EL34 Schematic
  2. DRD amplifier with CCS?
  3. Phono Preamp
  4. Dynaco ST-70 with a GSI board, Parts diagram and any info PLEASE
  5. transistor AC blocker
  6. PL519 Source
  7. Identify this mullard
  8. Suppo Audio -- New Chinese EL84 PP amp for CHEAP.
  9. Beard p35mkII schematics/photo photo
  10. Bias transformer question
  11. Anyone deliberately dial in 2nd harmonic?
  12. What is the sonic impact of SS CCS in tube equipment
  13. Phase help
  14. El34-kt88
  15. Transconductance amplifier based on hybrid cascode
  16. Chinese 6Z4, also those regulated supplies.
  17. Audion Reference restoration
  18. Anyone try a regulated PS in an Ultrapath preamp?
  19. Source for Resistor sets?
  20. High Zout tube preamps with ss power amps.
  21. PSUD II soft start
  22. About the 6AU6s
  23. Capacitor polarity question
  24. Audio Note line preamp question
  25. EL34 SE amp schematic
  26. looking for 12AT7 / ECC81 phase splitter
  27. 6AS7 getting rare?
  28. How to power up a new Build the first time
  29. power transformer for a 2a3se amp!
  30. 6DJ8 Tube Phono and Line Preamp
  31. ST-35 Build Using PC13 Boards Questions and Thoughts
  32. My new hybrid full single ended amplifier project on going
  33. Punch tools for making metal top plates on amps
  34. antique sound lab AQ1009-845 interstage transformer replacement
  35. The search for the ultimate 6SN7
  36. Looking for a good part web store
  37. Need your advice for tube amp case
  38. Questions about grounding
  39. power supply
  40. Strange idea for an output stage - comments requested
  41. Please comment on this EL84 PP design
  42. 1.5VDC Heater Supply For #26!?
  43. Looking for 300B or 2A3 design suggestions......gearing up for a new project
  44. original philips AD-9058
  45. Bench test equipment, What's yours?
  46. Gain calculating in 12ax7 guitar preamp
  47. Tube Lab SE Problem
  48. Tube Socket help, I'm looking at a few, but not sure which material to buy?
  49. Sweep tube info/specs
  50. Help for Tango 300b amp
  51. vacuum tubes type 10 and UX201A
  52. 6DQ5 specs for audio
  53. r-core output transformers...
  54. Isolation Transformer Question
  55. Buffer question?
  56. el95 pp amp for guitar
  57. Two positive rails from a center-tapped transformer?
  58. Help reqd - 115V PTX on 230V
  59. Replacing the cathode resistor with a current source in SE ?
  60. First 300b Design, Please comment
  61. 6AX4 datasheet question
  62. Bias Drift
  63. Recommend me a tube...
  64. What happens when Heater Cathode voltage is exceeded?
  65. 100uF Motor Run Caps
  66. HELP Schematics for RL 12 T 15
  67. Phono Stage
  68. TEE Vee Tube fans' SE Cf Amp
  69. Yaqin MC-10L losing volume
  70. Pl84 tubes
  71. AnalogMetric 6L6GC SE amp kit...thoughts about this kit?
  72. 5150 or slo 5-50w clone
  73. ECC88, warm up time
  74. Yaqin MC-10L Heater Voltage
  75. 6c33 otl amblifier
  76. self-oscillation in Dynaco ST-70
  77. computer tube tester
  78. Troubleshooting the decware se84 kit
  79. 6L6 PP problem
  80. First try at an Eagle Schematic/board
  81. opinions on decware zen kit
  82. Powerdrive for PP amp with local feedback and pentode driver ?
  83. having trouble calculating transconductance
  84. Philips console unit with reverb!
  85. 300BSET with Kimmel style mu driver ?
  86. Testing Mullard 12AU7 on Hickok 600A
  87. EL34/6CA7 driven 300B Schematics
  88. C450 Radio Craftsmen info needed
  89. Tubelab Simple SE v.2
  90. Magnetic shielding with aluminum
  91. lampizator dac
  92. AES is At It Again...
  93. Se Amp with Push Pull Transformer
  94. 6550 which breed can take the flog ?
  95. Chassis Question
  96. EL82 in triode with silverstepper (TVC)
  97. Joined the 12b4 line stage club. And worth it!
  98. ECL86/PCL86 Schematic
  99. Ambient temperature and tubes
  100. Vintage output transformers
  101. -ve grid voltage
  102. Ming Da MC-3008-A2 Mono Blocks
  103. V-Reg, Gyrator, Low (relative) voltage tubes
  104. Simple Tube amp
  105. Jolida 502A replace power switch
  106. Tubelab build selector switch question
  107. Matching tubes pot in old Fenders
  108. tubes supplier
  109. RadioDaze out of the tube business
  110. 8000+ hours on my Simple SE
  111. C-L-C-parallel-R-C
  112. musical power supplies
  113. Trimpots sound better than equivalent resistors for biasing?
  114. Anyone have a simple circuit for . .
  115. PP Tube Biasing, how good is good enough?
  116. Aesthetics
  117. Point to point, from scatch build of the K-12G
  118. What 6550 for Conrad MV75
  119. Motorboating phono input on Stromberg Carlson ASR433
  120. Sunn Sceptre: Weak Vibrato Cause?
  121. Pioneer sr-101
  122. 6AU6 in Push Pull: Opinions please
  123. Audionote M7 and Foreplay III
  124. vintage triode
  125. Help with design review wanted
  126. 6J52P pentode driver?
  127. a gutar amp I built
  128. Looking for a good valve preamp
  129. Anyone try the "Hazen mod" to G3 supressor grid
  130. 6L6GC -Which Shuguang can take the Heat?
  131. Using Toroidal PTs as tube OTs - methods and sources
  132. With a little help... KT88 PP UL Amp
  133. TechTube Featured In November AudioXpress
  134. Yaqin MC-100b channel imbalance
  135. Regulated Tube Preamp question
  136. Has anybody purchased from Mable Audio?
  137. PS voltage changes after capacitor replacement
  138. Non-magnetic bolts that hold an output transformer together
  139. Audio Innovations Series 500 Rewire
  140. Which audio electrolytics in tube voltages -- Your comments please !
  141. Some general opt questions.
  142. Looking for ANYTHING on the Audioromy 838 w/805A Tube..
  143. modifying zenith 7d31 amp console
  144. Questions on JE Labs transformer coupled line stage
  145. Onix/Melody SP3 Upgrades and Mods
  146. Motorboating with Regulated Supply
  147. 27 & 6SN7 Preamp - Crossover
  148. Budget 2A3?
  149. first go at design - pp
  150. Tube Amp for MP3 Player
  151. Sonic signatures of KT88, 300B, 805, 845 in SET & PP Configurations
  152. Marshall amp loses bias
  153. Building the Baby Huey EL84 pushpull amplifier
  154. Tube Voltage Regulator, Is it worth the effort?
  155. Best tubeamp for metal, tight bass
  156. Donor stereo 845 amp- now what!?
  157. "Optimal" output grid loading?
  158. wax poured out!
  159. Yet another do-nothing tOOb hack.
  160. What is a CCS - how do you design one?
  161. Strange Aikido problem when home power fluctuates
  162. Need to regulate 450v --> 300v
  163. new to the forum and looking for el86 info
  164. Why not invert the Tubelab SE board?
  165. Steve Bench Crossover Questions
  166. Audio Note M7 - 7F7 CCS
  167. Anyone have schema for katodcoupled 6C33 P-P?
  168. Ltspice and Valve models
  169. VTV Push-Pull 6SN7/KT88 Amp: DIY or China?
  170. How to identify type of bias used for my tube amp
  171. VR Tube Question
  172. Ampmaker Kits
  173. P-P with some muscle
  174. buzz w/ nothing plugged into inputs. Goes away once jacked in.
  175. CV6 / CV1135 / E1148 / VT232 VHF oscillator triode data
  176. HELP HELP HELP mesa rectifier
  177. simple se with source selector
  178. Measuring tube/component temperature
  179. Parallel Single Ended Amplifier Design using Acro TO-290s?
  180. Elevate heater trouble
  181. Adjusting the sensitivity on a 6e2 magic eye tube
  182. tube amp for automobile / need ideas
  183. 6550A HF Amp
  184. problem - scratchy sound, rythmical
  185. eico st70 irons!what to do?
  186. How Lampizator CD tube player sound?
  187. Maestro soya amplificador
  188. Can I use my tube amp as a preamp ?
  189. Simple SE with 6BG6GA - magic smoke escapes...
  190. Shunt Cascode Power Valve Driver
  191. Did Siemens ever publish data for their own D3A ?
  192. Motor run caps as power supply filter
  193. Measure unknown choke?
  194. 6528a....HELP ME PLEASE...PLEASE..
  195. Are any of these tubes useful to me?
  196. Heaters The Key Too Sweet Tube Tone.
  197. PP Output Transformer design
  198. "Kingfisher" P-P Amp using 7591A Outputs and Fisher 500B Iron
  199. 832 ultra-linear push pull?
  200. 3A5 thoughts
  201. ECC86 vs. ECC88
  202. RH84 builder!
  203. 10GV8 Bias point for the K-12G
  204. EL34 amp blowing up, anode glowing red hot
  205. Steve Bench's LR Phono Stage - Cathode Bias Circuit Question
  206. Tubelab SE w/Parafeed
  207. Chinese 805 SET monoblock
  208. Vreg or Ireg for Phono heaters
  209. Traynor YMV-1 Voicemaster to Guitar conversion
  210. Pentode preamp tube hum balance
  211. New (old) Friends
  212. How to avoid oscillation and get max BW out of crappy OPT
  213. Power Measurements at normal listening levels
  214. Best way to terminate unused OPT winding?
  215. patent on single-ended amplifier, anno 2008
  216. Headphones amplifier with highish gnfb
  217. Bias meter for AQ1008DT
  218. Change Tubes
  219. PLC84 amp
  220. Color Coding for Fisher 500B Iron
  221. Tubelab SE with 45 tubes only
  222. 6L6GC, ECC33, EF37 Amp.. Just cant get it right
  223. 10dB increase in volume needs what gain?
  224. El Cheapo feedback loop adjustment
  225. KT88 blocks? With E80CC + 6922 driver?
  226. 200+/- USA Tubes Plus "Weston Model 891" Tube Checker
  227. Violator Amp
  228. What to do with 3500uF 650V caps???
  229. SS Rectification
  230. Passive filter at tube amp input
  231. Found this Trio WX-400
  232. PSUD & The JE Labs 2A3
  233. 815
  234. x1 Oscilloscope probes
  235. Iron LTP Schade-PP
  236. Single Ended Pentode Spud and Feedback
  237. Yes, I've searched. Can I use a PP OPT in a SE amp ?
  238. DC on toroid PT windings
  239. Audible benefits of larger coupling caps than required?
  240. Any benefits of regulated current heater supply?
  241. Power Transformer Kaput ???
  242. aikido phono schematic qustion
  243. Easy question for experienced tubies
  244. valves dont sound so good when pink....
  245. Aikido Resistor Help
  246. Mobile Phone Interference
  247. Thank you DIY Audio
  248. Fisher 80-R Can't Find a Schematic
  249. SRPP layout
  250. Rogers E40a Amplifier Schematic

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