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  1. Did bootstrapping pot change it's operation
  2. Transformer wiring (Need Help)
  3. Class-d Hybrid
  4. New test data comparing different 7591's
  5. ZKIT2 Zen Triode mono SET amplifier kit
  6. Tango 11146 Output Transformers ?
  7. KT120 Tube
  8. B&K Dyna-Quik 500 test socket 9A shows good tubes as Bad
  9. Mu follower
  10. Aronov LS9100 - any info ???
  11. Tube Preamp Dock
  12. Grounded grid Zout
  13. HY69 in triode mode...some experience ?
  14. ITA LA 1B SCHEMATICS????
  15. Bleeder Resistor (Need Help)
  16. use of 12ax7 and 6v6 as 6T9 alternative?
  17. Positive feedback for amplifier input stage
  18. Rusted OT Issue?
  19. Multiple filament windings
  20. need help with frist tube amp
  21. Testing Western Electric 437a with TV-7D/U ?
  22. Graaf 5050
  23. finished breadboard project
  24. How Much is Too Much Filtering?
  25. 2a3 - for car use?
  26. troubleshooting a Mingda MC34AB
  27. How to repair and refurbish vintage tube amps?
  28. How to repair and refurbish vintage tube amps?
  29. NYAL OTL3 Amps
  30. 6DJ8/6922 rolling... any general consensus on these?
  31. Mullard 12AU7 tests bad when running grid leakage test?
  32. Can you identify this AMP??
  33. effects of different HT voltage
  34. Substituting a 12AX7 for a 12DW7
  35. what to do with 1uF???
  36. Correct power rating for Chicago OT - opinions
  37. Need help with Stancor 1.5 K OPT Tran.
  38. S5 K8-LM mono KIT (total newbie)
  39. Pentode section of 6M11
  40. Looking for goodme proven 2A3 SE project
  41. Music Angel MENG Series EL34 Push Pull Tube Integrated Amp
  42. Tube replacement causes bias problems.
  43. Spectra of tube glow: any data?
  44. Plate Characteristics for 6158 dual triode
  45. Center tap or not...
  46. Connecting G3 to a negative supply on a pentode
  47. Dynaco FM-3 Curcuit Boards
  48. Sonic Frontiers Line 2 schematic
  49. Philips Hi Z radio amp
  50. Need help modifying tube bias circuit
  51. filament transformer current rating
  52. SE OT power tube suggestions please!
  53. What is up with this wave form?
  54. Volume Controls
  55. Help identifying driver stage
  56. Uses for Cheapo 6CB5
  57. Twin DN2540 in TubelabSE?
  58. Bias or loss of power in one channel problem
  59. Drilling a hole in a Tube :)
  60. Tube stage placement in a mongrel (hybrid) amp
  61. Quad KT88 driver
  62. Single Ended Output Transformer
  63. 300B with interstage
  64. Problem with Aria (Meng) Mini 6p1 (glowing plate)
  65. possible to filter dips in AC line?
  66. Weston Ammeter Headphone Amp Prototype
  67. What is the fault with this amp?
  68. k-12G turret board version
  69. low voltage "high gain" amp
  70. Connect ipod/laptop to old 1950's radio
  71. (Weston Ammeter Headphone Amp Redux ?)
  72. Would it be possible to drive a 300b with new power jfets?
  73. Would it be possible to drive a 300b with new power jfets?
  74. Will KT88 increase output power in Copland CTA-402
  75. Music Angel XD-SE EL34 intermittent thump
  76. OPT with cathode feedback
  77. Rebuilding fisher sa-1000
  78. Little Dot Mk IV SE
  79. Choke power supplies and bypassing.
  80. Load resistor on OPT
  81. Ultimate Octal
  82. Help needed for 6H30 output schematic for DAC
  83. KT88 doubt
  84. Leave it on or turn it off?
  85. Did I do this loadline correctly
  86. Masco MA-35 rebuild
  87. Motorola SE console amp blown fuse
  88. What to do with Telefunken parts?
  89. OT as buffer?
  90. Single ended EL84 Schematic
  91. Pattern for power xmfr magnetic leaking ?
  92. heater voltage
  93. Small Speakers for 5 channel single ended amp
  94. missing circuit components- why?
  95. What to do with a 6N14P/ECC84
  96. Info for very rare neon tubes?
  97. UL for EL84. 22-24% is better than the dogma....40% is lowest distortion....
  98. Jan Tube question
  99. 60 watt tubeamp with Low B+
  100. What types of SET rock the hardest?
  101. UTC A16 interstage 300B
  102. 6C33
  103. Need wiring schematic for Conn 6050 amp
  104. 6N6P at very low voltage
  105. Transformer Swap
  106. Need help building a tube linestage for my gainclone
  107. Ping SY: His Master's Noise
  108. Wollensak SE 7591 parts projects?
  109. 807 screen voltage help
  110. My little 801A power amplifier
  111. Help needed finding a small DPST switch - confused!
  112. Help with bias pot- wont adjust!
  113. 6N6P / ECC99 / E182CC
  114. bias question
  115. Really low parts could el84 pp design for a beginner?
  116. moviola tubes -- other names?
  117. DHT with TDA1541A in a NOS DAC?
  118. VT100mk2 - Retubing
  119. Parallel 6L6 se iron suggestion.
  120. 6N2 Tube Srpp Drive Stage
  121. Unexpectedly good EL84 amp
  122. Kypo Electronic - Buffer, Preamp & Amp kits
  123. PSU bypass cap type
  124. Yaqin MC10-T
  125. Yaqin MC10-L Need help collating data
  126. Wanted: High Quality Complete tube NOS DAC with TDA1541A
  127. 6360 or 6939 as a phase inverter
  128. Peerless 16687 & 7142 Transformer Identification
  129. Wanted: High Quality DIY Tube NOS DAC with TDA1541A
  130. Restoration of leak stereo 20: advice pls
  131. DC Tube Heaters
  132. Musical Paradise MP-428 300B Amplifier
  133. Tube regulator
  134. Why overvoltage on HT?
  135. 50c5 schematic question
  136. Me again... matrix decoding w/ tubes?
  137. chapman 305 transformer wiring
  138. tube rolling el34 need advice
  139. Adding resistance to OT circuit.
  140. Tube pre-amp + Class-D amp. any experience?
  141. Bias using a ccs as an anode load
  142. Magnepan High Frequency Tube Amp
  143. Home-Made Plate Curves
  144. Vacuum Tube Audio PH-11
  145. Latest project SRPP valve front end with class D MOSFET output stage.
  146. Melos 400 restoration project - need help (unaltered reference needed)
  147. Comparison of Sovtek 5751 and RCA 5751
  148. Heater supply for the 866a
  149. How good is good enough when designing a line stage?
  150. Cathode/plate resistors ??
  151. Tubes and LTspice?
  152. Is this an oscillation problem? -broskie CCA linestage
  153. Simple Octal SET help.
  154. Capacitor Sanity Check
  155. VTVM substitute?
  156. What music/sound style for 845 tubes?
  157. Advice Needed
  158. Favorite ouput tube (SE only)
  159. Best make of audio valves/tubes
  160. How to calculate source impedance for audio transformer?
  161. what the best kit for Dynaco
  162. That mystery trem cap
  163. A Hot Rodded Bottlehead S.E.X. Amplifier
  164. Cheap Chinese amps
  165. Who makes their own OPT around here?
  166. 71A
  167. Sound quality chinese tube amplifiers
  168. freeware circuit simulator for Osx (Mac)
  169. 12ax7LP substitute
  170. RH84 SE Build and custom Edcor power transformer
  171. 6l6 se primary impedance choice
  172. Luxman SQ38FD mkII, schematic
  173. 6c33 SET (my next project). Need some feedback
  174. Amorphous iron UMCCC-125: what would you do from it?
  175. Old Fisher SA-300 Amp help!
  176. What kind of sound does a noisy 12B4 make ??
  177. KT88 bias current keeps drifting
  178. Oddball Tube - Useful for Audio??
  179. 12AX7 dual triode "Signal Enhancer/Conditioner"
  180. 2nos of 6l6 in Parallel SE mode
  181. Output transformer selection
  182. 5C8S rectifier psud2 modle/rectifier information
  183. EF80 / KT77 SIngle Ended
  184. Longevity of output tubes in triode vs pentode
  185. ekco ui59 receiver
  186. simple heater question .....
  187. Different Differential Pairs
  188. Decware Zen SET (first project/90% finished)
  189. YL-1200 for audioamp
  190. 7984's
  191. Building First Preamp HELP
  192. Aikido All-In-One Octal B+ measurement.
  193. OPT PP for GU50 Triode ?
  194. Requesting input on preamp schematic
  195. Longer life 6CA7's for class A
  196. Organ split
  197. Two amps done and done!
  198. Tube ID
  199. How to best drive an 845?
  200. K-16ls + ton pcb (just finished pics)
  201. Helios + Pultec tube EQ rack prototype.
  202. 12ax7 preamplifier with modified power supply!!! please help!
  203. tube amp prototype with pc
  204. Looking for a new diy project
  205. To James or to Baxandall?
  206. 45 triode : max 275 or 300 vdc ?
  207. Anyone with experience breaking in capacitors out of circuit?
  208. Vt-64/800 tube amp/preamp
  209. Hammond 1609 Output Transformer - EL84
  210. 60 Watts A Channel 6528A Tube Amp
  211. AC or DC heathing?
  212. 1000W tube amplifier
  213. LEDs or RC?
  214. Is this amp worth bringing back to life?
  215. Melody PM845
  216. Need help troubleshooting this integrated.
  217. Wanted...design for D3a triode strapped driving 45
  218. Removing Tone Controls from VoM Preamp/Amp
  219. Philips 8580 useful anywhere?
  220. output transformer info
  221. 100Hz square preamp responce help
  222. 6P21s 6n21c tube, True Direct Heater?
  223. Convert Dogzilla for Hi-Fi output
  224. Bogen AP-35 Static and Pop from one channel
  225. EL34 PP triode mode hums
  226. Rectifiers
  227. Yaqin MC 10l problem
  228. Stripping Edcor's powder coating
  229. 5Y3 with slow warm up input and output tubes
  230. power transformer question
  231. DHT heaters . and their property"s
  232. Power Tube Cathode Resistor "distance"
  233. Does the same output power from tube amp and ss amp have difference?
  234. Field coil questions
  235. MC240 found in a shed.
  236. "Impossible" circuit which seems to amplify anyway.
  237. EL84 driving EL84 SEP
  238. Tube buffer for MosFet Citation 12
  239. Building a better power Triode
  240. Original KT88? or not
  241. Moscode 300 Upgrade
  242. Onwer's Manual for Realistic SAF-24D
  243. 2 stage Stereo/4 Stage Mono Triode Preamp with independent drive control & inverters
  244. 6J4 Experiment!
  245. Anyone build Broskie's T8 OTL?
  246. Just WHY are DHT tubes SO Expensive....?
  247. Two chassis grounding
  248. Tubes vs. Caps?
  249. Impedance and output transformer selection question
  250. Preamp tube SRPP 12AU7 VS preamp tube Aikido 12AU7 = all use rec 6X5GT

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