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  1. Capacitor polarity question
  2. Audio Note line preamp question
  3. EL34 SE amp schematic
  4. looking for 12AT7 / ECC81 phase splitter
  5. 6AS7 getting rare?
  6. How to power up a new Build the first time
  7. power transformer for a 2a3se amp!
  8. 6DJ8 Tube Phono and Line Preamp
  9. ST-35 Build Using PC13 Boards Questions and Thoughts
  10. My new hybrid full single ended amplifier project on going
  11. Punch tools for making metal top plates on amps
  12. antique sound lab AQ1009-845 interstage transformer replacement
  13. The search for the ultimate 6SN7
  14. Looking for a good part web store
  15. Need your advice for tube amp case
  16. Questions about grounding
  17. power supply
  18. Strange idea for an output stage - comments requested
  19. Please comment on this EL84 PP design
  20. 1.5VDC Heater Supply For #26!?
  21. Looking for 300B or 2A3 design suggestions......gearing up for a new project
  22. original philips AD-9058
  23. Bench test equipment, What's yours?
  24. Gain calculating in 12ax7 guitar preamp
  25. Tube Lab SE Problem
  26. Tube Socket help, I'm looking at a few, but not sure which material to buy?
  27. Sweep tube info/specs
  28. Help for Tango 300b amp
  29. vacuum tubes type 10 and UX201A
  30. 6DQ5 specs for audio
  31. r-core output transformers...
  32. Isolation Transformer Question
  33. Buffer question?
  34. el95 pp amp for guitar
  35. Two positive rails from a center-tapped transformer?
  36. Help reqd - 115V PTX on 230V
  37. Replacing the cathode resistor with a current source in SE ?
  38. First 300b Design, Please comment
  39. 6AX4 datasheet question
  40. Bias Drift
  41. Recommend me a tube...
  42. What happens when Heater Cathode voltage is exceeded?
  43. 100uF Motor Run Caps
  44. HELP Schematics for RL 12 T 15
  45. Phono Stage
  46. TEE Vee Tube fans' SE Cf Amp
  47. Yaqin MC-10L losing volume
  48. Pl84 tubes
  49. AnalogMetric 6L6GC SE amp kit...thoughts about this kit?
  50. 5150 or slo 5-50w clone
  51. ECC88, warm up time
  52. Yaqin MC-10L Heater Voltage
  53. 6c33 otl amblifier
  54. self-oscillation in Dynaco ST-70
  55. computer tube tester
  56. Troubleshooting the decware se84 kit
  57. 6L6 PP problem
  58. First try at an Eagle Schematic/board
  59. opinions on decware zen kit
  60. Powerdrive for PP amp with local feedback and pentode driver ?
  61. having trouble calculating transconductance
  62. Philips console unit with reverb!
  63. 300BSET with Kimmel style mu driver ?
  64. Testing Mullard 12AU7 on Hickok 600A
  65. EL34/6CA7 driven 300B Schematics
  66. C450 Radio Craftsmen info needed
  67. Tubelab Simple SE v.2
  68. Magnetic shielding with aluminum
  69. lampizator dac
  70. AES is At It Again...
  71. Se Amp with Push Pull Transformer
  72. 6550 which breed can take the flog ?
  73. Chassis Question
  74. EL82 in triode with silverstepper (TVC)
  75. Joined the 12b4 line stage club. And worth it!
  76. ECL86/PCL86 Schematic
  77. Ambient temperature and tubes
  78. Vintage output transformers
  79. -ve grid voltage
  80. Ming Da MC-3008-A2 Mono Blocks
  81. V-Reg, Gyrator, Low (relative) voltage tubes
  82. Simple Tube amp
  83. Jolida 502A replace power switch
  84. Tubelab build selector switch question
  85. Matching tubes pot in old Fenders
  86. tubes supplier
  87. RadioDaze out of the tube business
  88. 8000+ hours on my Simple SE
  89. C-L-C-parallel-R-C
  90. musical power supplies
  91. Trimpots sound better than equivalent resistors for biasing?
  92. Anyone have a simple circuit for . .
  93. PP Tube Biasing, how good is good enough?
  94. Aesthetics
  95. Point to point, from scatch build of the K-12G
  96. What 6550 for Conrad MV75
  97. Motorboating phono input on Stromberg Carlson ASR433
  98. Sunn Sceptre: Weak Vibrato Cause?
  99. Pioneer sr-101
  100. 6AU6 in Push Pull: Opinions please
  101. Audionote M7 and Foreplay III
  102. vintage triode
  103. Help with design review wanted
  104. 6J52P pentode driver?
  105. a gutar amp I built
  106. Looking for a good valve preamp
  107. Anyone try the "Hazen mod" to G3 supressor grid
  108. 6L6GC -Which Shuguang can take the Heat?
  109. Using Toroidal PTs as tube OTs - methods and sources
  110. With a little help... KT88 PP UL Amp
  111. TechTube Featured In November AudioXpress
  112. Yaqin MC-100b channel imbalance
  113. Regulated Tube Preamp question
  114. Has anybody purchased from Mable Audio?
  115. PS voltage changes after capacitor replacement
  116. Non-magnetic bolts that hold an output transformer together
  117. Audio Innovations Series 500 Rewire
  118. Which audio electrolytics in tube voltages -- Your comments please !
  119. Some general opt questions.
  120. Looking for ANYTHING on the Audioromy 838 w/805A Tube..
  121. modifying zenith 7d31 amp console
  122. Questions on JE Labs transformer coupled line stage
  123. Onix/Melody SP3 Upgrades and Mods
  124. Motorboating with Regulated Supply
  125. 27 & 6SN7 Preamp - Crossover
  126. Budget 2A3?
  127. first go at design - pp
  128. Tube Amp for MP3 Player
  129. Sonic signatures of KT88, 300B, 805, 845 in SET & PP Configurations
  130. Marshall amp loses bias
  131. Building the Baby Huey EL84 pushpull amplifier
  132. Tube Voltage Regulator, Is it worth the effort?
  133. Best tubeamp for metal, tight bass
  134. Donor stereo 845 amp- now what!?
  135. "Optimal" output grid loading?
  136. wax poured out!
  137. Yet another do-nothing tOOb hack.
  138. What is a CCS - how do you design one?
  139. Strange Aikido problem when home power fluctuates
  140. Need to regulate 450v --> 300v
  141. new to the forum and looking for el86 info
  142. Why not invert the Tubelab SE board?
  143. Steve Bench Crossover Questions
  144. Audio Note M7 - 7F7 CCS
  145. Anyone have schema for katodcoupled 6C33 P-P?
  146. Ltspice and Valve models
  147. VTV Push-Pull 6SN7/KT88 Amp: DIY or China?
  148. How to identify type of bias used for my tube amp
  149. VR Tube Question
  150. Ampmaker Kits
  151. P-P with some muscle
  152. buzz w/ nothing plugged into inputs. Goes away once jacked in.
  153. CV6 / CV1135 / E1148 / VT232 VHF oscillator triode data
  154. HELP HELP HELP mesa rectifier
  155. simple se with source selector
  156. Measuring tube/component temperature
  157. Parallel Single Ended Amplifier Design using Acro TO-290s?
  158. Elevate heater trouble
  159. Adjusting the sensitivity on a 6e2 magic eye tube
  160. tube amp for automobile / need ideas
  161. 6550A HF Amp
  162. problem - scratchy sound, rythmical
  163. eico st70 irons!what to do?
  164. How Lampizator CD tube player sound?
  165. Maestro soya amplificador
  166. Can I use my tube amp as a preamp ?
  167. Simple SE with 6BG6GA - magic smoke escapes...
  168. Shunt Cascode Power Valve Driver
  169. Did Siemens ever publish data for their own D3A ?
  170. Motor run caps as power supply filter
  171. Measure unknown choke?
  172. 6528a....HELP ME PLEASE...PLEASE..
  173. Are any of these tubes useful to me?
  174. Heaters The Key Too Sweet Tube Tone.
  175. PP Output Transformer design
  176. "Kingfisher" P-P Amp using 7591A Outputs and Fisher 500B Iron
  177. 832 ultra-linear push pull?
  178. 3A5 thoughts
  179. ECC86 vs. ECC88
  180. RH84 builder!
  181. 10GV8 Bias point for the K-12G
  182. EL34 amp blowing up, anode glowing red hot
  183. Steve Bench's LR Phono Stage - Cathode Bias Circuit Question
  184. Tubelab SE w/Parafeed
  185. Chinese 805 SET monoblock
  186. Vreg or Ireg for Phono heaters
  187. Traynor YMV-1 Voicemaster to Guitar conversion
  188. Pentode preamp tube hum balance
  189. New (old) Friends
  190. How to avoid oscillation and get max BW out of crappy OPT
  191. Power Measurements at normal listening levels
  192. Best way to terminate unused OPT winding?
  193. patent on single-ended amplifier, anno 2008
  194. Headphones amplifier with highish gnfb
  195. Bias meter for AQ1008DT
  196. Change Tubes
  197. PLC84 amp
  198. Color Coding for Fisher 500B Iron
  199. Tubelab SE with 45 tubes only
  200. 6L6GC, ECC33, EF37 Amp.. Just cant get it right
  201. 10dB increase in volume needs what gain?
  202. El Cheapo feedback loop adjustment
  203. KT88 blocks? With E80CC + 6922 driver?
  204. 200+/- USA Tubes Plus "Weston Model 891" Tube Checker
  205. Violator Amp
  206. What to do with 3500uF 650V caps???
  207. SS Rectification
  208. Passive filter at tube amp input
  209. Found this Trio WX-400
  210. PSUD & The JE Labs 2A3
  211. 815
  212. x1 Oscilloscope probes
  213. Iron LTP Schade-PP
  214. Single Ended Pentode Spud and Feedback
  215. Yes, I've searched. Can I use a PP OPT in a SE amp ?
  216. DC on toroid PT windings
  217. Audible benefits of larger coupling caps than required?
  218. Any benefits of regulated current heater supply?
  219. Power Transformer Kaput ???
  220. aikido phono schematic qustion
  221. Easy question for experienced tubies
  222. valves dont sound so good when pink....
  223. Aikido Resistor Help
  224. Mobile Phone Interference
  225. Thank you DIY Audio
  226. Fisher 80-R Can't Find a Schematic
  227. SRPP layout
  228. Rogers E40a Amplifier Schematic
  229. Encapsulating OPTs
  230. Does anyone have 6BQ6 (sweep tube) triode plate curves to share?
  231. JAN6418 and microphony
  232. can the 6n9s take 300v? (ru 6sl7)
  233. Output impedance of various MOSFET followers at low (<10mA) currents
  234. Big Box O' Tubes
  235. 6j7g 832a amp
  236. Quick Question on Dc coupling
  237. PP question - best driver stage!
  238. SRPP+, or did JRB "borrow" from here?
  239. 5651(A) 85Kr
  240. Ampex 6v6 PP.. worth saving?
  241. The DeForest 504 tube
  242. Sven 6P1P PP Amp
  243. Black 6V6GT - originals
  244. tube phasing for more power?
  245. measuring output transformer inductance?
  246. Question re paralleling common-cathode tube sections
  247. There's so much bait for dumb fishies out there!
  248. Biasing G3 in beamies
  249. 6DJ8 vs 6N1P (6H1N)
  250. Test equipment collection

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