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  1. Identify this mullard
  2. Suppo Audio -- New Chinese EL84 PP amp for CHEAP.
  3. Beard p35mkII schematics/photo photo
  4. Bias transformer question
  5. Anyone deliberately dial in 2nd harmonic?
  6. What is the sonic impact of SS CCS in tube equipment
  7. Phase help
  8. El34-kt88
  9. Transconductance amplifier based on hybrid cascode
  10. Chinese 6Z4, also those regulated supplies.
  11. Audion Reference restoration
  12. Anyone try a regulated PS in an Ultrapath preamp?
  13. High Zout tube preamps with ss power amps.
  14. PSUD II soft start
  15. About the 6AU6s
  16. Audio Note line preamp question
  17. EL34 SE amp schematic
  18. looking for 12AT7 / ECC81 phase splitter
  19. 6AS7 getting rare?
  20. How to power up a new Build the first time
  21. power transformer for a 2a3se amp!
  22. 6DJ8 Tube Phono and Line Preamp
  23. ST-35 Build Using PC13 Boards Questions and Thoughts
  24. My new hybrid full single ended amplifier project on going
  25. antique sound lab AQ1009-845 interstage transformer replacement
  26. The search for the ultimate 6SN7
  27. Looking for a good part web store
  28. Need your advice for tube amp case
  29. Questions about grounding
  30. power supply
  31. Strange idea for an output stage - comments requested
  32. Please comment on this EL84 PP design
  33. 1.5VDC Heater Supply For #26!?
  34. Looking for 300B or 2A3 design suggestions......gearing up for a new project
  35. original philips AD-9058
  36. Bench test equipment, What's yours?
  37. Tube Lab SE Problem
  38. Tube Socket help, I'm looking at a few, but not sure which material to buy?
  39. Sweep tube info/specs
  40. Help for Tango 300b amp
  41. vacuum tubes type 10 and UX201A
  42. 6DQ5 specs for audio
  43. r-core output transformers...
  44. Buffer question?
  45. Two positive rails from a center-tapped transformer?
  46. Help reqd - 115V PTX on 230V
  47. Replacing the cathode resistor with a current source in SE ?
  48. First 300b Design, Please comment
  49. 6AX4 datasheet question
  50. Bias Drift
  51. Recommend me a tube...
  52. What happens when Heater Cathode voltage is exceeded?
  53. HELP Schematics for RL 12 T 15
  54. Phono Stage
  55. TEE Vee Tube fans' SE Cf Amp
  56. Yaqin MC-10L losing volume
  57. PL84 tubes
  58. AnalogMetric 6L6GC SE amp kit...thoughts about this kit?
  59. 5150 or slo 5-50w clone
  60. ECC88, warm up time
  61. Yaqin MC-10L Heater Voltage
  62. 6c33 otl amblifier
  63. self-oscillation in Dynaco ST-70
  64. Troubleshooting the decware se84 kit
  65. 6L6 PP problem
  66. First try at an Eagle Schematic/board
  67. opinions on decware zen kit
  68. Powerdrive for PP amp with local feedback and pentode driver ?
  69. having trouble calculating transconductance
  70. Philips console unit with reverb!
  71. 300BSET with Kimmel style mu driver ?
  72. EL34/6CA7 driven 300B Schematics
  73. C450 Radio Craftsmen info needed
  74. Magnetic shielding with aluminum
  75. lampizator dac
  76. AES is At It Again...
  77. Se Amp with Push Pull Transformer
  78. 6550 which breed can take the flog ?
  79. Chassis Question
  80. EL82 in triode with silverstepper (TVC)
  81. Joined the 12b4 line stage club. And worth it!
  82. ECL86/PCL86 Schematic
  83. Ambient temperature and tubes
  84. Vintage output transformers
  85. -ve grid voltage
  86. Ming Da MC-3008-A2 Mono Blocks
  87. V-Reg, Gyrator, Low (relative) voltage tubes
  88. Simple Tube amp
  89. Jolida 502A replace power switch
  90. tubes supplier
  91. C-L-C-parallel-R-C
  92. musical power supplies
  93. Trimpots sound better than equivalent resistors for biasing?
  94. Anyone have a simple circuit for . .
  95. PP Tube Biasing, how good is good enough?
  96. Aesthetics
  97. Point to point, from scatch build of the K-12G
  98. What 6550 for Conrad MV75
  99. Motorboating phono input on Stromberg Carlson ASR433
  100. Pioneer sr-101
  101. 6AU6 in Push Pull: Opinions please
  102. Audionote M7 and Foreplay III
  103. vintage triode
  104. Help with design review wanted
  105. 6J52P pentode driver?
  106. a gutar amp I built
  107. Looking for a good valve preamp
  108. Anyone try the "Hazen mod" to G3 supressor grid
  109. 6L6GC -Which Shuguang can take the Heat?
  110. Using Toroidal PTs as tube OTs - methods and sources
  111. With a little help... KT88 PP UL Amp
  112. TechTube Featured In November AudioXpress
  113. Yaqin MC-100b channel imbalance
  114. Regulated Tube Preamp question
  115. Has anybody purchased from Mable Audio?
  116. PS voltage changes after capacitor replacement
  117. Non-magnetic bolts that hold an output transformer together
  118. Audio Innovations Series 500 Rewire
  119. Which audio electrolytics in tube voltages -- Your comments please !
  120. Some general opt questions.
  121. Looking for ANYTHING on the Audioromy 838 w/805A Tube..
  122. modifying zenith 7d31 amp console
  123. Questions on JE Labs transformer coupled line stage
  124. Onix/Melody SP3 Upgrades and Mods
  125. Motorboating with Regulated Supply
  126. 27 & 6SN7 Preamp - Crossover
  127. Budget 2A3?
  128. first go at design - pp
  129. Tube Amp for MP3 Player
  130. Sonic signatures of KT88, 300B, 805, 845 in SET & PP Configurations
  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. Steve Bench Crossover Questions
  143. Audio Note M7 - 7F7 CCS
  144. Anyone have schema for katodcoupled 6C33 P-P?
  145. VTV Push-Pull 6SN7/KT88 Amp: DIY or China?
  146. How to identify type of bias used for my tube amp
  147. VR Tube Question
  148. Ampmaker Kits
  149. P-P with some muscle
  150. buzz w/ nothing plugged into inputs. Goes away once jacked in.
  151. CV6 / CV1135 / E1148 / VT232 VHF oscillator triode data
  152. Measuring tube/component temperature
  153. Parallel Single Ended Amplifier Design using Acro TO-290s?
  154. Elevate heater trouble
  155. Adjusting the sensitivity on a 6e2 magic eye tube
  156. tube amp for automobile / need ideas
  157. 6550A HF Amp
  158. problem - scratchy sound, rythmical
  159. eico st70 irons!what to do?
  160. Maestro soya amplificador
  161. Can I use my tube amp as a preamp ?
  162. Shunt Cascode Power Valve Driver
  163. Did Siemens ever publish data for their own D3A ?
  164. Measure unknown choke?
  165. 6528a....HELP ME PLEASE...PLEASE..
  166. Are any of these tubes useful to me?
  167. Heaters The Key Too Sweet Tube Tone.
  168. PP Output Transformer design
  169. "Kingfisher" P-P Amp using 7591A Outputs and Fisher 500B Iron
  170. 832 ultra-linear push pull?
  171. 3A5 thoughts
  172. ECC86 vs. ECC88
  173. RH84 builder!
  174. 10GV8 Bias point for the K-12G
  175. EL34 amp blowing up, anode glowing red hot
  176. Steve Bench's LR Phono Stage - Cathode Bias Circuit Question
  177. Chinese 805 SET monoblock
  178. Vreg or Ireg for Phono heaters
  179. Pentode preamp tube hum balance
  180. New (old) Friends
  181. How to avoid oscillation and get max BW out of crappy OPT
  182. Power Measurements at normal listening levels
  183. Best way to terminate unused OPT winding?
  184. patent on single-ended amplifier, anno 2008
  185. Headphones amplifier with highish gnfb
  186. Change Tubes
  187. PLC84 amp
  188. Color Coding for Fisher 500B Iron
  189. 6L6GC, ECC33, EF37 Amp.. Just cant get it right
  190. 10dB increase in volume needs what gain?
  191. El Cheapo feedback loop adjustment
  192. KT88 blocks? With E80CC + 6922 driver?
  193. 200+/- USA Tubes Plus "Weston Model 891" Tube Checker
  194. SS Rectification
  195. Passive filter at tube amp input
  196. Found this Trio WX-400
  197. PSUD & The JE Labs 2A3
  198. 815
  199. Iron LTP Schade-PP
  200. Single Ended Pentode Spud and Feedback
  201. Yes, I've searched. Can I use a PP OPT in a SE amp ?
  202. DC on toroid PT windings
  203. Any benefits of regulated current heater supply?
  204. Power Transformer Kaput ???
  205. aikido phono schematic qustion
  206. Easy question for experienced tubies
  207. valves dont sound so good when pink....
  208. Aikido Resistor Help
  209. Mobile Phone Interference
  210. Thank you DIY Audio
  211. Fisher 80-R Can't Find a Schematic
  212. SRPP layout
  213. Rogers E40a Amplifier Schematic
  214. Encapsulating OPTs
  215. Does anyone have 6BQ6 (sweep tube) triode plate curves to share?
  216. JAN6418 and microphony
  217. can the 6n9s take 300v? (ru 6sl7)
  218. Output impedance of various MOSFET followers at low (<10mA) currents
  219. Big Box O' Tubes
  220. 6j7g 832a amp
  221. Quick Question on Dc coupling
  222. PP question - best driver stage!
  223. SRPP+, or did JRB "borrow" from here?
  224. 5651(A) 85Kr
  225. Ampex 6v6 PP.. worth saving?
  226. The DeForest 504 tube
  227. Sven 6P1P PP Amp
  228. Black 6V6GT - originals
  229. tube phasing for more power?
  230. Question re paralleling common-cathode tube sections
  231. There's so much bait for dumb fishies out there!
  232. Biasing G3 in beamies
  233. 6DJ8 vs 6N1P (6H1N)
  234. Rca mi-9358a
  235. FISHER - 500b Caps Leave Them In ???
  236. RCA Calypso
  237. New to Valve Amps and Confused???
  238. Anyone used the TL783 as a CCS
  239. Katelelo
  240. EFE-1 (PP EL-34) by Miolljub Mile Nestorovic
  241. Ping netlist - ECC88 spice models
  242. Please help analyse 807 PPP
  243. DIY Tube Pre with remote
  244. P-P Katodfollower with 6c33c
  245. valve sub
  246. Help on outboard PSU for tube amp
  247. Looking for ARC LS8MKII circuit?
  248. Entire Assembly Glowing in 20 Seconds
  249. 6X5GT PS Problem
  250. Sad News About Blackburn / Tech Tube

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