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  1. Best make of audio valves/tubes
  2. How to calculate source impedance for audio transformer?
  3. what the best kit for Dynaco
  4. That mystery trem cap
  5. A Hot Rodded Bottlehead S.E.X. Amplifier
  6. Cheap Chinese amps
  7. Who makes their own OPT around here?
  8. 71A
  9. Sound quality chinese tube amplifiers
  10. freeware circuit simulator for Osx (Mac)
  11. 12ax7LP substitute
  12. RH84 SE Build and custom Edcor power transformer
  13. 6l6 se primary impedance choice
  14. Luxman SQ38FD mkII, schematic
  15. 6c33 SET (my next project). Need some feedback
  16. Amorphous iron UMCCC-125: what would you do from it?
  17. Old Fisher SA-300 Amp help!
  18. What kind of sound does a noisy 12B4 make ??
  19. KT88 bias current keeps drifting
  20. Oddball Tube - Useful for Audio??
  21. 12AX7 dual triode "Signal Enhancer/Conditioner"
  22. 2nos of 6l6 in Parallel SE mode
  23. Output transformer selection
  24. 5C8S rectifier psud2 modle/rectifier information
  25. EF80 / KT77 SIngle Ended
  26. Longevity of output tubes in triode vs pentode
  27. ekco ui59 receiver
  28. simple heater question .....
  29. Different Differential Pairs
  30. Decware Zen SET (first project/90% finished)
  31. YL-1200 for audioamp
  32. 7984's
  33. Building First Preamp HELP
  34. Aikido All-In-One Octal B+ measurement.
  35. OPT PP for GU50 Triode ?
  36. Requesting input on preamp schematic
  37. Longer life 6CA7's for class A
  38. Organ split
  39. Two amps done and done!
  40. Tube ID
  41. How to best drive an 845?
  42. K-16ls + ton pcb (just finished pics)
  43. Helios + Pultec tube EQ rack prototype.
  44. 12ax7 preamplifier with modified power supply!!! please help!
  45. tube amp prototype with pc
  46. Looking for a new diy project
  47. To James or to Baxandall?
  48. 45 triode : max 275 or 300 vdc ?
  49. Anyone with experience breaking in capacitors out of circuit?
  50. Vt-64/800 tube amp/preamp
  51. Hammond 1609 Output Transformer - EL84
  52. 60 Watts A Channel 6528A Tube Amp
  53. AC or DC heathing?
  54. 1000W tube amplifier
  55. LEDs or RC?
  56. Is this amp worth bringing back to life?
  57. Melody PM845
  58. Need help troubleshooting this integrated.
  59. Wanted...design for D3a triode strapped driving 45
  60. Removing Tone Controls from VoM Preamp/Amp
  61. Philips 8580 useful anywhere?
  62. output transformer info
  63. 100Hz square preamp responce help
  64. 6P21s 6n21c tube, True Direct Heater?
  65. Convert Dogzilla for Hi-Fi output
  66. Bogen AP-35 Static and Pop from one channel
  67. EL34 PP triode mode hums
  68. Rectifiers
  69. Yaqin MC 10l problem
  70. Stripping Edcor's powder coating
  71. 5Y3 with slow warm up input and output tubes
  72. power transformer question
  73. DHT heaters . and their property"s
  74. Power Tube Cathode Resistor "distance"
  75. Does the same output power from tube amp and ss amp have difference?
  76. Field coil questions
  77. MC240 found in a shed.
  78. "Impossible" circuit which seems to amplify anyway.
  79. EL84 driving EL84 SEP
  80. Tube buffer for MosFet Citation 12
  81. Building a better power Triode
  82. Original KT88? or not
  83. Moscode 300 Upgrade
  84. Onwer's Manual for Realistic SAF-24D
  85. 2 stage Stereo/4 Stage Mono Triode Preamp with independent drive control & inverters
  86. 6J4 Experiment!
  87. Anyone build Broskie's T8 OTL?
  88. Just WHY are DHT tubes SO Expensive....?
  89. Two chassis grounding
  90. Tubes vs. Caps?
  91. Impedance and output transformer selection question
  92. Preamp tube SRPP 12AU7 VS preamp tube Aikido 12AU7 = all use rec 6X5GT
  93. What kind of tube did I use back then?
  94. Wanted: Vacuum Tube Phono Preamp for PAS
  95. Lower gain in YS Audio linestage
  96. Converting 12FQ8 for 12AX7 , HELP !!!
  97. Transformer Inquiry
  98. Question about rp and the AC load line
  99. KTA-HiFi ST-70 pcb or marantz 8b. HiFi build
  100. What is it about SET's?
  101. The Russian Connection - (Maybe) A build thread. (KT88 SEP)
  102. A small help with russian low voltage tube
  103. Acoustic (not Audio) Alchemy Labs
  104. Mullard 404? ECL82 amp
  105. OP & tube power transormers
  106. EML 300B-XLS Schematic?
  107. Experiences with TAD EL34?
  108. C3g simulation model
  109. ok maybe im just a newb when it comes to amps but...
  110. Yet another compactron to play with...
  111. Weird heater arrangement 12ax7/6bm8
  112. I love SET can we fix what I hate?
  113. Tony's 6H32 pre-amp
  114. To tone control or not to...
  115. EL84 plate voltage.
  116. 6bx7
  117. Anyone in the L.A. area with scope willing to troubleshoot?
  118. Transformers in series OK?
  119. Russian 6CA4/EZ81 Equivalent?
  120. Amp build recomendation.. for Frazier model sevens
  121. How can I make a DIY AC probe for my DMM
  122. PSUDII Question
  123. EH KT88 Glowing Welds?
  124. Not quite DIY
  125. Searching for a TUBE datasheet GE GL-421
  126. 6EM7 Unit 1
  127. woohoo! RDH4!!!
  128. VTL hum
  129. Use CL-90 to slow 5Y3?
  130. Allen Wright, 1947-2011
  131. Octaves/Ghost notes from Bogen K10. Caps?
  132. Q1, 300B S-Splot, 360V 60mA? Q2, James 6112HS or 6123HS?
  133. What audio output xfmr for a 6BM8 pp amp?
  134. Parafeeding an EL84 SE(T)
  135. Interesting video from the production of KR tubes
  136. Gassy WE 300b
  137. Bogen Pa Identification 6l6 x 4 dual rectifier
  138. SE output transformer DIY
  139. AA 151 or Scott 222
  140. Toroidal Output Transformer
  141. Hytron HY615 Data ???
  142. Can I use a 12AX7 with CT 6.3V?
  143. torroidal power transformers
  144. What amp is this
  145. B+ ramping up before CCS filament - danger?
  146. Recommend a good plate choke for 26 tube!!
  147. S11E12 TUBES
  148. Low dropout 6.3v
  149. how to adjust the filament power ecc83
  150. Cary/AES - AE3 Linestage Help Needed !
  151. 5867a
  152. 6V6/12AX7 Project Question/Help
  153. Ultra Linear Push Pull Tube amp
  154. A little help with 6v6 screen needed.
  155. Output Transformers... Decisions Decisions
  156. Need Help. PSU not voltage down from design
  157. D/A preamp FFT measurements for review plz
  158. Type 40, 12A, 112A(syl)
  159. American Audio Picker
  160. one half of a tube in schematic????
  161. estimating power rating of Telefunken transformer
  162. Where is mistake??
  163. Building a 6s45P amp - transformer help
  164. High-End preamplifier with ECC82!
  165. Attempting to recap a couple of old Ampex 2010 suitcase amps
  166. Hi specs rectifier needed
  167. Lux 6056N Interstage Transformer
  168. Aikido Line Stage / Buffer
  169. JJ KT88s and other octals
  170. Triodes from Russia
  171. Little help needed / do I have a bad tube or really good tube?
  172. 5.1 channel 807 SE amplifier
  173. Plate loaded 6N6P over SRPP 6N6P any day of the week...
  174. Voltage multiplier vs transformer for preamp HV power supply
  175. does tube bias drift like silicon devices
  176. Best EL34 For Triode mode
  177. ASL AQ 1002 PP KT88 problem with input stage
  178. 2A3 Amp schematic suggestions?
  179. what I need for safe use mercury rectifier
  180. Anybody listened to Glow Audio?
  181. Tubes too close to output transformers?
  182. Help with stereo to mono for project
  183. MC3500 with 807 tubes and modern driver tubes
  184. I need a project......preferably a HIFI amp..........
  185. REN904 for linestage?
  186. Urgent advice on Chinese purchase please!
  187. VR tubes, minimum current
  188. Senior Project Tube Preamp
  189. Antek AS-4T430 measurements
  190. small, light dc coupled 6ea7 amp sanity check
  191. 6S33S SE Transformer Set
  192. I think I blew my amp!! plase help
  193. Genalex VS Mullard 12AT7 & 12AX7's HUGE DIFF?
  194. Music Angel XD-850MKIII 300b integrated amp
  195. 8150's
  196. More junk from China
  197. 6GM8 above 8mA/24V
  198. One Tube Sound Better Than Four?
  199. HK Citation V rebuild - any advice?
  200. 6GM8/ECC86
  201. Sound Valves vtp-101 Schematic
  202. ~17-18w sweep tube with large plate cap
  203. Fisher 500B Comparison
  204. New build of P-P PCL86 Amp
  205. Transformer question
  206. Can 110V Quad IIs be configured to 220V?
  207. Advice needed re repairing Audio Research VT100
  208. Yaqin SD-CD3 Tube Buffer - upgrading caps
  209. Gyrator PSU's in tube amps
  210. EL34 Amp Running KT66, Safe ?
  211. MJ Optimized Valve Regulator
  212. Need JAN 6418 tube stereo headphone preamp kit advice!
  213. Electronic choke
  214. Can you please help identifying this amp?
  215. [TubeAmp] Beginner's questions
  216. .47uF output cap to 1uF?
  217. Spark gaps on output transformers
  218. St 35 or St 70?
  219. Pi wound output transformers
  220. miniatures 6n1p 6n2p
  221. HK Citation V schematic?
  222. Physical Oscillating noise from phono stage
  223. PP 6c33c-b
  224. Modifying the classic Williamson
  225. eimac 152TL and 304TL
  226. LTspice model for Dynaco A470 Output Transfomer
  227. audiodesignguide.com PP KT88
  228. One more 4P1L SE
  229. Mount rectifier above torroidal transformer?
  230. Extending Tube Sockets off a PCB
  231. Looking for a great starter stereo P-P amp
  232. Question regarding value of Telefunken tubes.
  233. Magic Eye tube
  234. Partridge Transformers
  235. 6CG7 replacing E88CC in SE KT88 Amp.
  236. Omit the filament windings -- LTM8033 from Linear
  237. Best position for bleeder resistor?
  238. anyone have experience with a Radio Craftsmen C400?
  239. Amp-A, a variation to the EL84 Push Pull theme
  240. tony's 6LU8 push-pull power amp build
  241. First Post Here
  242. MFA Lumi sings high-pitched tunes
  243. Power tubes not drawing current
  244. replacing tubes with circuitry
  245. High Voltage Regulators (Maida or zener)
  246. GU-81m tube amp schematics???
  247. Suggestions on SIPP driver stage
  248. How to eliminate the "white noise" for the 300B tube amp?
  249. 6BQ5 UL Curves?
  250. Looking for simple Schematic of 2A3 or 45 or 26 Headphone Amp SE OTL ? anyone ?

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