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  1. Substituting a 12AX7 for a 12DW7
  2. what to do with 1uF???
  3. Correct power rating for Chicago OT - opinions
  4. Need help with Stancor 1.5 K OPT Tran.
  5. S5 K8-LM mono KIT (total newbie)
  6. Pentode section of 6M11
  7. Looking for goodme proven 2A3 SE project
  8. Music Angel MENG Series EL34 Push Pull Tube Integrated Amp
  9. Tube replacement causes bias problems.
  10. Spectra of tube glow: any data?
  11. Plate Characteristics for 6158 dual triode
  12. Center tap or not...
  13. Connecting G3 to a negative supply on a pentode
  14. Dynaco FM-3 Curcuit Boards
  15. Sonic Frontiers Line 2 schematic
  16. Philips Hi Z radio amp
  17. Need help modifying tube bias circuit
  18. filament transformer current rating
  19. SE OT power tube suggestions please!
  20. What is up with this wave form?
  21. Volume Controls
  22. Help identifying driver stage
  23. Uses for Cheapo 6CB5
  24. Twin DN2540 in TubelabSE?
  25. Bias or loss of power in one channel problem
  26. Drilling a hole in a Tube :)
  27. Tube stage placement in a mongrel (hybrid) amp
  28. Quad KT88 driver
  29. Single Ended Output Transformer
  30. 300B with interstage
  31. Problem with Aria (Meng) Mini 6p1 (glowing plate)
  32. possible to filter dips in AC line?
  33. Weston Ammeter Headphone Amp Prototype
  34. What is the fault with this amp?
  35. k-12G turret board version
  36. low voltage "high gain" amp
  37. Connect ipod/laptop to old 1950's radio
  38. (Weston Ammeter Headphone Amp Redux ?)
  39. Would it be possible to drive a 300b with new power jfets?
  40. Would it be possible to drive a 300b with new power jfets?
  41. Will KT88 increase output power in Copland CTA-402
  42. Music Angel XD-SE EL34 intermittent thump
  43. OPT with cathode feedback
  44. Rebuilding fisher sa-1000
  45. Little Dot Mk IV SE
  46. Choke power supplies and bypassing.
  47. Load resistor on OPT
  48. Ultimate Octal
  49. Help needed for 6H30 output schematic for DAC
  50. KT88 doubt
  51. Leave it on or turn it off?
  52. Did I do this loadline correctly
  53. Masco MA-35 rebuild
  54. Motorola SE console amp blown fuse
  55. What to do with Telefunken parts?
  56. OT as buffer?
  57. Single ended EL84 Schematic
  58. Pattern for power xmfr magnetic leaking ?
  59. heater voltage
  60. Small Speakers for 5 channel single ended amp
  61. missing circuit components- why?
  62. What to do with a 6N14P/ECC84
  63. Info for very rare neon tubes?
  64. UL for EL84. 22-24% is better than the dogma....40% is lowest distortion....
  65. Jan Tube question
  66. 60 watt tubeamp with Low B+
  67. What types of SET rock the hardest?
  68. UTC A16 interstage 300B
  69. 6C33
  70. Need wiring schematic for Conn 6050 amp
  71. 6N6P at very low voltage
  72. Transformer Swap
  73. Need help building a tube linestage for my gainclone
  74. Ping SY: His Master's Noise
  75. Wollensak SE 7591 parts projects?
  76. 807 screen voltage help
  77. My little 801A power amplifier
  78. Help needed finding a small DPST switch - confused!
  79. Help with bias pot- wont adjust!
  80. 6N6P / ECC99 / E182CC
  81. bias question
  82. Really low parts could el84 pp design for a beginner?
  83. moviola tubes -- other names?
  84. DHT with TDA1541A in a NOS DAC?
  85. VT100mk2 - Retubing
  86. Parallel 6L6 se iron suggestion.
  87. 6N2 Tube Srpp Drive Stage
  88. Unexpectedly good EL84 amp
  89. Kypo Electronic - Buffer, Preamp & Amp kits
  90. PSU bypass cap type
  91. Yaqin MC10-T
  92. Yaqin MC10-L Need help collating data
  93. Wanted: High Quality Complete tube NOS DAC with TDA1541A
  94. 6360 or 6939 as a phase inverter
  95. Peerless 16687 & 7142 Transformer Identification
  96. Wanted: High Quality DIY Tube NOS DAC with TDA1541A
  97. Restoration of leak stereo 20: advice pls
  98. DC Tube Heaters
  99. Musical Paradise MP-428 300B Amplifier
  100. Tube regulator
  101. Why overvoltage on HT?
  102. 50c5 schematic question
  103. Me again... matrix decoding w/ tubes?
  104. chapman 305 transformer wiring
  105. tube rolling el34 need advice
  106. Adding resistance to OT circuit.
  107. Tube pre-amp + Class-D amp. any experience?
  108. Bias using a ccs as an anode load
  109. Magnepan High Frequency Tube Amp
  110. Home-Made Plate Curves
  111. Vacuum Tube Audio PH-11
  112. Latest project SRPP valve front end with class D MOSFET output stage.
  113. Melos 400 restoration project - need help (unaltered reference needed)
  114. Comparison of Sovtek 5751 and RCA 5751
  115. Heater supply for the 866a
  116. How good is good enough when designing a line stage?
  117. Cathode/plate resistors ??
  118. Tubes and LTspice?
  119. Is this an oscillation problem? -broskie CCA linestage
  120. Simple Octal SET help.
  121. Capacitor Sanity Check
  122. VTVM substitute?
  123. What music/sound style for 845 tubes?
  124. Advice Needed
  125. Favorite ouput tube (SE only)
  126. Best make of audio valves/tubes
  127. How to calculate source impedance for audio transformer?
  128. what the best kit for Dynaco
  129. That mystery trem cap
  130. A Hot Rodded Bottlehead S.E.X. Amplifier
  131. Cheap Chinese amps
  132. Who makes their own OPT around here?
  133. 71A
  134. Sound quality chinese tube amplifiers
  135. freeware circuit simulator for Osx (Mac)
  136. 12ax7LP substitute
  137. RH84 SE Build and custom Edcor power transformer
  138. 6l6 se primary impedance choice
  139. Luxman SQ38FD mkII, schematic
  140. 6c33 SET (my next project). Need some feedback
  141. Amorphous iron UMCCC-125: what would you do from it?
  142. Old Fisher SA-300 Amp help!
  143. What kind of sound does a noisy 12B4 make ??
  144. KT88 bias current keeps drifting
  145. Oddball Tube - Useful for Audio??
  146. 12AX7 dual triode "Signal Enhancer/Conditioner"
  147. 2nos of 6l6 in Parallel SE mode
  148. Output transformer selection
  149. 5C8S rectifier psud2 modle/rectifier information
  150. EF80 / KT77 SIngle Ended
  151. Longevity of output tubes in triode vs pentode
  152. ekco ui59 receiver
  153. simple heater question .....
  154. Different Differential Pairs
  155. Decware Zen SET (first project/90% finished)
  156. YL-1200 for audioamp
  157. 7984's
  158. Building First Preamp HELP
  159. Aikido All-In-One Octal B+ measurement.
  160. OPT PP for GU50 Triode ?
  161. Requesting input on preamp schematic
  162. Longer life 6CA7's for class A
  163. Organ split
  164. Two amps done and done!
  165. Tube ID
  166. How to best drive an 845?
  167. K-16ls + ton pcb (just finished pics)
  168. Helios + Pultec tube EQ rack prototype.
  169. 12ax7 preamplifier with modified power supply!!! please help!
  170. tube amp prototype with pc
  171. Looking for a new diy project
  172. To James or to Baxandall?
  173. 45 triode : max 275 or 300 vdc ?
  174. Anyone with experience breaking in capacitors out of circuit?
  175. Vt-64/800 tube amp/preamp
  176. Hammond 1609 Output Transformer - EL84
  177. 60 Watts A Channel 6528A Tube Amp
  178. AC or DC heathing?
  179. 1000W tube amplifier
  180. LEDs or RC?
  181. Is this amp worth bringing back to life?
  182. Melody PM845
  183. Need help troubleshooting this integrated.
  184. Wanted...design for D3a triode strapped driving 45
  185. Removing Tone Controls from VoM Preamp/Amp
  186. Philips 8580 useful anywhere?
  187. output transformer info
  188. 100Hz square preamp responce help
  189. 6P21s 6n21c tube, True Direct Heater?
  190. Convert Dogzilla for Hi-Fi output
  191. Bogen AP-35 Static and Pop from one channel
  192. EL34 PP triode mode hums
  193. Rectifiers
  194. Yaqin MC 10l problem
  195. Stripping Edcor's powder coating
  196. 5Y3 with slow warm up input and output tubes
  197. power transformer question
  198. DHT heaters . and their property"s
  199. Power Tube Cathode Resistor "distance"
  200. Does the same output power from tube amp and ss amp have difference?
  201. Field coil questions
  202. MC240 found in a shed.
  203. "Impossible" circuit which seems to amplify anyway.
  204. EL84 driving EL84 SEP
  205. Tube buffer for MosFet Citation 12
  206. Building a better power Triode
  207. Original KT88? or not
  208. Moscode 300 Upgrade
  209. Onwer's Manual for Realistic SAF-24D
  210. 2 stage Stereo/4 Stage Mono Triode Preamp with independent drive control & inverters
  211. 6J4 Experiment!
  212. Anyone build Broskie's T8 OTL?
  213. Just WHY are DHT tubes SO Expensive....?
  214. Two chassis grounding
  215. Tubes vs. Caps?
  216. Impedance and output transformer selection question
  217. Preamp tube SRPP 12AU7 VS preamp tube Aikido 12AU7 = all use rec 6X5GT
  218. What kind of tube did I use back then?
  219. Wanted: Vacuum Tube Phono Preamp for PAS
  220. Lower gain in YS Audio linestage
  221. Converting 12FQ8 for 12AX7 , HELP !!!
  222. Transformer Inquiry
  223. Question about rp and the AC load line
  224. KTA-HiFi ST-70 pcb or marantz 8b. HiFi build
  225. What is it about SET's?
  226. The Russian Connection - (Maybe) A build thread. (KT88 SEP)
  227. A small help with russian low voltage tube
  228. Acoustic (not Audio) Alchemy Labs
  229. Mullard 404? ECL82 amp
  230. OP & tube power transormers
  231. EML 300B-XLS Schematic?
  232. Experiences with TAD EL34?
  233. C3g simulation model
  234. ok maybe im just a newb when it comes to amps but...
  235. Yet another compactron to play with...
  236. Weird heater arrangement 12ax7/6bm8
  237. I love SET can we fix what I hate?
  238. Tony's 6H32 pre-amp
  239. To tone control or not to...
  240. EL84 plate voltage.
  241. 6bx7
  242. Anyone in the L.A. area with scope willing to troubleshoot?
  243. Transformers in series OK?
  244. Russian 6CA4/EZ81 Equivalent?
  245. Amp build recomendation.. for Frazier model sevens
  246. How can I make a DIY AC probe for my DMM
  247. PSUDII Question
  248. EH KT88 Glowing Welds?
  249. Not quite DIY
  250. Searching for a TUBE datasheet GE GL-421

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