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  1. Grounded grid Zout
  2. HY69 in triode mode...some experience ?
  3. ITA LA 1B SCHEMATICS????
  4. Thoughts on PSU
  5. Bleeder Resistor (Need Help)
  6. use of 12ax7 and 6v6 as 6T9 alternative?
  7. Do I want fast settling or massive filtration in PS?
  8. Positive feedback for amplifier input stage
  9. Rusted OT Issue?
  10. Multiple filament windings
  11. need help with frist tube amp
  12. Testing Western Electric 437a with TV-7D/U ?
  13. Graaf 5050
  14. finished breadboard project
  15. How Much is Too Much Filtering?
  16. 2a3 - for car use?
  17. troubleshooting a Mingda MC34AB
  18. How to repair and refurbish vintage tube amps?
  19. How to repair and refurbish vintage tube amps?
  20. NYAL OTL3 Amps
  21. 6DJ8/6922 rolling... any general consensus on these?
  22. Mullard 12AU7 tests bad when running grid leakage test?
  23. Can you identify this AMP??
  24. effects of different HT voltage
  25. Substituting a 12AX7 for a 12DW7
  26. what to do with 1uF???
  27. Correct power rating for Chicago OT - opinions
  28. Need help with Stancor 1.5 K OPT Tran.
  29. S5 K8-LM mono KIT (total newbie)
  30. Pentode section of 6M11
  31. Looking for goodme proven 2A3 SE project
  32. Music Angel MENG Series EL34 Push Pull Tube Integrated Amp
  33. Tube replacement causes bias problems.
  34. Spectra of tube glow: any data?
  35. Plate Characteristics for 6158 dual triode
  36. Center tap or not...
  37. Connecting G3 to a negative supply on a pentode
  38. Dynaco FM-3 Curcuit Boards
  39. Sonic Frontiers Line 2 schematic
  40. Philips Hi Z radio amp
  41. Need help modifying tube bias circuit
  42. filament transformer current rating
  43. SE OT power tube suggestions please!
  44. What is up with this wave form?
  45. Volume Controls
  46. Help identifying driver stage
  47. Tube mixing console
  48. Uses for Cheapo 6CB5
  49. Twin DN2540 in TubelabSE?
  50. Bias or loss of power in one channel problem
  51. Drilling a hole in a Tube :)
  52. Tube stage placement in a mongrel (hybrid) amp
  53. Tubelab Single Ended
  54. Quad KT88 driver
  55. Single Ended Output Transformer
  56. SE P-P guitar amp.
  57. 300B with interstage
  58. Problem with Aria (Meng) Mini 6p1 (glowing plate)
  59. possible to filter dips in AC line?
  60. Weston Ammeter Headphone Amp Prototype
  61. What is the fault with this amp?
  62. k-12G turret board version
  63. low voltage "high gain" amp
  64. Wanted: ELNA Cerafine 10000uf 63v New or used
  65. Connect ipod/laptop to old 1950's radio
  66. Percieved Power outputs Tube vs Solid State
  67. (Weston Ammeter Headphone Amp Redux ?)
  68. Tube guitar amp for acoustic guitar?
  69. Would it be possible to drive a 300b with new power jfets?
  70. Would it be possible to drive a 300b with new power jfets?
  71. Will KT88 increase output power in Copland CTA-402
  72. Music Angel XD-SE EL34 intermittent thump
  73. OPT with cathode feedback
  74. Rebuilding fisher sa-1000
  75. Little Dot Mk IV SE
  76. EF86 on HICKOK 752a tester..??
  77. Choke power supplies and bypassing.
  78. Load resistor on OPT
  79. Ultimate Octal
  80. Help needed for 6H30 output schematic for DAC
  81. KT88 doubt
  82. Leave it on or turn it off?
  83. 6y6 output tube and Fender Champ(ion)
  84. Did I do this loadline correctly
  85. Masco MA-35 rebuild
  86. Motorola SE console amp blown fuse
  87. What to do with Telefunken parts?
  88. OT as buffer?
  89. Single ended EL84 Schematic
  90. Pattern for power xmfr magnetic leaking ?
  91. heater voltage
  92. Small Speakers for 5 channel single ended amp
  93. missing circuit components- why?
  94. valve rectifier series resistors
  95. What to do with a 6N14P/ECC84
  96. Info for very rare neon tubes?
  97. Fender 5F1 Champ clone with triode mode
  98. UL for EL84. 22-24% is better than the dogma....40% is lowest distortion....
  99. Jan Tube question
  100. 60 watt tubeamp with Low B+
  101. What types of SET rock the hardest?
  102. UTC A16 interstage 300B
  103. 6C33
  104. Need wiring schematic for Conn 6050 amp
  105. 6N6P at very low voltage
  106. Transformer Swap
  107. Need help building a tube linestage for my gainclone
  108. Ping SY: His Master's Noise
  109. Wollensak SE 7591 parts projects?
  110. 807 screen voltage help
  111. My little 801A power amplifier
  112. Help needed finding a small DPST switch - confused!
  113. Help with bias pot- wont adjust!
  114. 6N6P / ECC99 / E182CC
  115. bias question
  116. Really low parts could el84 pp design for a beginner?
  117. moviola tubes -- other names?
  118. DHT with TDA1541A in a NOS DAC?
  119. 6C33C-B Tube Tester
  120. VT100mk2 - Retubing
  121. Parallel 6L6 se iron suggestion.
  122. 6N2 Tube Srpp Drive Stage
  123. Unexpectedly good EL84 amp
  124. Kypo Electronic - Buffer, Preamp & Amp kits
  125. PSU bypass cap type
  126. Yaqin MC10-T
  127. Yaqin MC10-L Need help collating data
  128. Wanted: High Quality Complete tube NOS DAC with TDA1541A
  129. 6360 or 6939 as a phase inverter
  130. Peerless 16687 & 7142 Transformer Identification
  131. Wanted: High Quality DIY Tube NOS DAC with TDA1541A
  132. Restoration of leak stereo 20: advice pls
  133. DC Tube Heaters
  134. Musical Paradise MP-428 300B Amplifier
  135. Tube regulator
  136. Why overvoltage on HT?
  137. 50c5 schematic question
  138. Me again... matrix decoding w/ tubes?
  139. chapman 305 transformer wiring
  140. tube rolling el34 need advice
  141. Adding resistance to OT circuit.
  142. Tube pre-amp + Class-D amp. any experience?
  143. Bias using a ccs as an anode load
  144. Magnepan High Frequency Tube Amp
  145. Home-Made Plate Curves
  146. Vacuum Tube Audio PH-11
  147. Latest project SRPP valve front end with class D MOSFET output stage.
  148. Melos 400 restoration project - need help (unaltered reference needed)
  149. Comparison of Sovtek 5751 and RCA 5751
  150. Replacing electrolytic caps
  151. Heater supply for the 866a
  152. How good is good enough when designing a line stage?
  153. Cathode/plate resistors ??
  154. Tubes and LTspice?
  155. Is this an oscillation problem? -broskie CCA linestage
  156. Simple Octal SET help.
  157. Capacitor Sanity Check
  158. VTVM substitute?
  159. Caps - Mundorf Silver/oil vs silver/gold/oil
  160. What music/sound style for 845 tubes?
  161. Advice Needed
  162. Favorite ouput tube (SE only)
  163. Best make of audio valves/tubes
  164. How to calculate source impedance for audio transformer?
  165. Schematic for REDDi DI-Box?
  166. what the best kit for Dynaco
  167. That mystery trem cap
  168. A Hot Rodded Bottlehead S.E.X. Amplifier
  169. Cheap Chinese amps
  170. Wanted: Leak ST-50 Mains transformer 240V
  171. Eico HF-20 to bass guitar amp
  172. Ampeg B-18 issue/debug
  173. Who makes their own OPT around here?
  174. 71A
  175. Sound quality chinese tube amplifiers
  176. freeware circuit simulator for Osx (Mac)
  177. 12ax7LP substitute
  178. RH84 SE Build and custom Edcor power transformer
  179. 6l6 se primary impedance choice
  180. Luxman SQ38FD mkII, schematic
  181. 6c33 SET (my next project). Need some feedback
  182. Amorphous iron UMCCC-125: what would you do from it?
  183. Old Fisher SA-300 Amp help!
  184. What kind of sound does a noisy 12B4 make ??
  185. KT88 bias current keeps drifting
  186. Oddball Tube - Useful for Audio??
  187. 12AX7 dual triode "Signal Enhancer/Conditioner"
  188. 2nos of 6l6 in Parallel SE mode
  189. Output transformer selection
  190. 5C8S rectifier psud2 modle/rectifier information
  191. EF80 / KT77 SIngle Ended
  192. Longevity of output tubes in triode vs pentode
  193. Fender champ circuit low output.
  194. ekco ui59 receiver
  195. simple heater question .....
  196. Different Differential Pairs
  197. Decware Zen SET (first project/90% finished)
  198. YL-1200 for audioamp
  199. 7984's
  200. Building First Preamp HELP
  201. Aikido All-In-One Octal B+ measurement.
  202. OPT PP for GU50 Triode ?
  203. Requesting input on preamp schematic
  204. Longer life 6CA7's for class A
  205. Organ split
  206. Two amps done and done!
  207. Testing the 5842/417a on Sencore MU150?
  208. Why Class A Guitar Amplifiers Sound So Good ........
  209. Tube ID
  210. How to best drive an 845?
  211. K-16ls + ton pcb (just finished pics)
  212. Helios + Pultec tube EQ rack prototype.
  213. 12ax7 preamplifier with modified power supply!!! please help!
  214. tube amp prototype with pc
  215. Looking for a new diy project
  216. To James or to Baxandall?
  217. 45 triode : max 275 or 300 vdc ?
  218. Anyone with experience breaking in capacitors out of circuit?
  219. Vt-64/800 tube amp/preamp
  220. Hammond 1609 Output Transformer - EL84
  221. Chinese Capacitors
  222. 60 Watts A Channel 6528A Tube Amp
  223. AC or DC heathing?
  224. 1000W tube amplifier
  225. LEDs or RC?
  226. Is this amp worth bringing back to life?
  227. Melody PM845
  228. Need help troubleshooting this integrated.
  229. Wanted...design for D3a triode strapped driving 45
  230. Removing Tone Controls from VoM Preamp/Amp
  231. Philips 8580 useful anywhere?
  232. output transformer info
  233. 100Hz square preamp responce help
  234. 6P21s 6n21c tube, True Direct Heater?
  235. Convert Dogzilla for Hi-Fi output
  236. Bogen AP-35 Static and Pop from one channel
  237. EL34 PP triode mode hums
  238. Rectifiers
  239. Yaqin MC 10l problem
  240. Stripping Edcor's powder coating
  241. 5Y3 with slow warm up input and output tubes
  242. power transformer question
  243. DHT heaters . and their property"s
  244. Power Tube Cathode Resistor "distance"
  245. Does the same output power from tube amp and ss amp have difference?
  246. 32 Channel Microphone Preamp
  247. Field coil questions
  248. MC240 found in a shed.
  249. "Impossible" circuit which seems to amplify anyway.
  250. EL84 driving EL84 SEP

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