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  1. Home-Made Plate Curves
  2. Vacuum Tube Audio PH-11
  3. Latest project SRPP valve front end with class D MOSFET output stage.
  4. Melos 400 restoration project - need help (unaltered reference needed)
  5. Comparison of Sovtek 5751 and RCA 5751
  6. Replacing electrolytic caps
  7. Heater supply for the 866a
  8. How good is good enough when designing a line stage?
  9. Cathode/plate resistors ??
  10. Tubes and LTspice?
  11. Is this an oscillation problem? -broskie CCA linestage
  12. Simple Octal SET help.
  13. Capacitor Sanity Check
  14. VTVM substitute?
  15. Caps - Mundorf Silver/oil vs silver/gold/oil
  16. What music/sound style for 845 tubes?
  17. Advice Needed
  18. Favorite ouput tube (SE only)
  19. Best make of audio valves/tubes
  20. How to calculate source impedance for audio transformer?
  21. Schematic for REDDi DI-Box?
  22. what the best kit for Dynaco
  23. That mystery trem cap
  24. A Hot Rodded Bottlehead S.E.X. Amplifier
  25. Cheap Chinese amps
  26. Wanted: Leak ST-50 Mains transformer 240V
  27. Eico HF-20 to bass guitar amp
  28. Ampeg B-18 issue/debug
  29. Who makes their own OPT around here?
  30. 71A
  31. Sound quality chinese tube amplifiers
  32. freeware circuit simulator for Osx (Mac)
  33. 12ax7LP substitute
  34. RH84 SE Build and custom Edcor power transformer
  35. 6l6 se primary impedance choice
  36. Luxman SQ38FD mkII, schematic
  37. 6c33 SET (my next project). Need some feedback
  38. Amorphous iron UMCCC-125: what would you do from it?
  39. Old Fisher SA-300 Amp help!
  40. What kind of sound does a noisy 12B4 make ??
  41. KT88 bias current keeps drifting
  42. Oddball Tube - Useful for Audio??
  43. 12AX7 dual triode "Signal Enhancer/Conditioner"
  44. 2nos of 6l6 in Parallel SE mode
  45. Output transformer selection
  46. 5C8S rectifier psud2 modle/rectifier information
  47. EF80 / KT77 SIngle Ended
  48. Longevity of output tubes in triode vs pentode
  49. Fender champ circuit low output.
  50. ekco ui59 receiver
  51. simple heater question .....
  52. Different Differential Pairs
  53. Decware Zen SET (first project/90% finished)
  54. YL-1200 for audioamp
  55. 7984's
  56. Building First Preamp HELP
  57. Aikido All-In-One Octal B+ measurement.
  58. OPT PP for GU50 Triode ?
  59. Requesting input on preamp schematic
  60. Longer life 6CA7's for class A
  61. Organ split
  62. Two amps done and done!
  63. Testing the 5842/417a on Sencore MU150?
  64. Why Class A Guitar Amplifiers Sound So Good ........
  65. Tube ID
  66. How to best drive an 845?
  67. K-16ls + ton pcb (just finished pics)
  68. Helios + Pultec tube EQ rack prototype.
  69. 12ax7 preamplifier with modified power supply!!! please help!
  70. tube amp prototype with pc
  71. Looking for a new diy project
  72. To James or to Baxandall?
  73. 45 triode : max 275 or 300 vdc ?
  74. Anyone with experience breaking in capacitors out of circuit?
  75. Vt-64/800 tube amp/preamp
  76. Hammond 1609 Output Transformer - EL84
  77. Chinese Capacitors
  78. 60 Watts A Channel 6528A Tube Amp
  79. AC or DC heathing?
  80. 1000W tube amplifier
  81. LEDs or RC?
  82. Is this amp worth bringing back to life?
  83. Melody PM845
  84. Need help troubleshooting this integrated.
  85. Wanted...design for D3a triode strapped driving 45
  86. Removing Tone Controls from VoM Preamp/Amp
  87. Philips 8580 useful anywhere?
  88. output transformer info
  89. 100Hz square preamp responce help
  90. 6P21s 6n21c tube, True Direct Heater?
  91. Convert Dogzilla for Hi-Fi output
  92. Bogen AP-35 Static and Pop from one channel
  93. EL34 PP triode mode hums
  94. Rectifiers
  95. Yaqin MC 10l problem
  96. Stripping Edcor's powder coating
  97. 5Y3 with slow warm up input and output tubes
  98. power transformer question
  99. DHT heaters . and their property"s
  100. Power Tube Cathode Resistor "distance"
  101. Does the same output power from tube amp and ss amp have difference?
  102. 32 Channel Microphone Preamp
  103. Field coil questions
  104. MC240 found in a shed.
  105. "Impossible" circuit which seems to amplify anyway.
  106. EL84 driving EL84 SEP
  107. Tube buffer for MosFet Citation 12
  108. Building a better power Triode
  109. Original KT88? or not
  110. Moscode 300 Upgrade
  111. Onwer's Manual for Realistic SAF-24D
  112. 2 stage Stereo/4 Stage Mono Triode Preamp with independent drive control & inverters
  113. 6J4 Experiment!
  114. Anyone build Broskie's T8 OTL?
  115. Just WHY are DHT tubes SO Expensive....?
  116. Two chassis grounding
  117. Tubes vs. Caps?
  118. Impedance and output transformer selection question
  119. Preamp tube SRPP 12AU7 VS preamp tube Aikido 12AU7 = all use rec 6X5GT
  120. peavey tube amplifiers
  121. Stark 9-66 tester repair
  122. 5e7 bandmaster build q's
  123. What kind of tube did I use back then?
  124. Wanted: Vacuum Tube Phono Preamp for PAS
  125. Lower gain in YS Audio linestage
  126. Converting 12FQ8 for 12AX7 , HELP !!!
  127. Transformer Inquiry
  128. Gibson BR-9 Tube Amp Issues
  129. Stromberg-Carlson AU-35 PA Amp for Guitar
  130. Pitfalls of paralleling different resistor brands?
  131. Question about rp and the AC load line
  132. KTA-HiFi ST-70 pcb or marantz 8b. HiFi build
  133. What is it about SET's?
  134. Help with Power cable on guitar amp
  135. The Russian Connection - (Maybe) A build thread. (KT88 SEP)
  136. A small help with russian low voltage tube
  137. EL34 vs 6L6 for HiFi
  138. Acoustic (not Audio) Alchemy Labs
  139. Mullard 404? ECL82 amp
  140. OP & tube power transormers
  141. EML 300B-XLS Schematic?
  142. Experiences with TAD EL34?
  143. C3g simulation model
  144. ok maybe im just a newb when it comes to amps but...
  145. Yet another compactron to play with...
  146. Weird heater arrangement 12ax7/6bm8
  147. I love SET can we fix what I hate?
  148. Tony's 6H32 pre-amp
  149. rebias guitar amp if using same tubes???
  150. To tone control or not to...
  151. EL84 plate voltage.
  152. 6bx7
  153. Anyone in the L.A. area with scope willing to troubleshoot?
  154. Transformers in series OK?
  155. Russian 6CA4/EZ81 Equivalent?
  156. Amp build recomendation.. for Frazier model sevens
  157. How can I make a DIY AC probe for my DMM
  158. PSUDII Question
  159. EH KT88 Glowing Welds?
  160. Not quite DIY
  161. Searching for a TUBE datasheet GE GL-421
  162. 6EM7 Unit 1
  163. woohoo! RDH4!!!
  164. VTL hum
  165. Use CL-90 to slow 5Y3?
  166. Allen Wright, 1947-2011
  167. Octaves/Ghost notes from Bogen K10. Caps?
  168. Q1, 300B S-Splot, 360V 60mA? Q2, James 6112HS or 6123HS?
  169. What audio output xfmr for a 6BM8 pp amp?
  170. Parafeeding an EL84 SE(T)
  171. Interesting video from the production of KR tubes
  172. Gassy WE 300b
  173. Bogen Pa Identification 6l6 x 4 dual rectifier
  174. SE output transformer DIY
  175. Tektronix TDS714L or other Tek TDS series digital oscilloscope for stereo?
  176. AA 151 or Scott 222
  177. Toroidal Output Transformer
  178. Hytron HY615 Data ???
  179. Can I use a 12AX7 with CT 6.3V?
  180. torroidal power transformers
  181. What amp is this
  182. B+ ramping up before CCS filament - danger?
  183. Telefunken Magnetophon 85 --> EL95 Guitar amp
  184. Recommend a good plate choke for 26 tube!!
  185. S11E12 TUBES
  186. Low dropout 6.3v
  187. how to adjust the filament power ecc83
  188. Cary/AES - AE3 Linestage Help Needed !
  189. 5867a
  190. 6V6/12AX7 Project Question/Help
  191. Ultra Linear Push Pull Tube amp
  192. A little help with 6v6 screen needed.
  193. Output Transformers... Decisions Decisions
  194. Need Help. PSU not voltage down from design
  195. D/A preamp FFT measurements for review plz
  196. Type 40, 12A, 112A(syl)
  197. American Audio Picker
  198. one half of a tube in schematic????
  199. estimating power rating of Telefunken transformer
  200. Where is mistake??
  201. Building a 6s45P amp - transformer help
  202. High-End preamplifier with ECC82!
  203. Attempting to recap a couple of old Ampex 2010 suitcase amps
  204. Hi specs rectifier needed
  205. Lux 6056N Intertstage Transformer
  206. Aikido Line Stage / Buffer
  207. JJ KT88s and other octals
  208. Triodes from Russia
  209. Little help needed / do I have a bad tube or really good tube?
  210. 5.1 channel 807 SE amplifier
  211. Plate loaded 6N6P over SRPP 6N6P any day of the week...
  212. Voltage multiplier vs transformer for preamp HV power supply
  213. does tube bias drift like silicon devices
  214. What are the best pots for less than $50 each?
  215. Best EL34 For Triode mode
  216. ASL AQ 1002 PP KT88 problem with input stage
  217. 2A3 Amp schematic suggestions?
  218. what I need for safe use mercury rectifier
  219. Anybody listened to Glow Audio?
  220. Tubes too close to output transformers?
  221. Help with stereo to mono for project
  222. MC3500 with 807 tubes and modern driver tubes
  223. Multiple Film Caps in parallel, Problems?
  224. I need a project......preferably a HIFI amp..........
  225. Aguilar DB-900 question
  226. REN904 for linestage?
  227. Urgent advice on Chinese purchase please!
  228. VR tubes, minimum current
  229. Senior Project Tube Preamp
  230. Antek AS-4T430 measurements
  231. small, light dc coupled 6ea7 amp sanity check
  232. 6S33S SE Transformer Set
  233. I think I blew my amp!! plase help
  234. Genalex VS Mullard 12AT7 & 12AX7's HUGE DIFF?
  235. testing 6550's on a Hickok 539b, same as KT88?
  236. 9V tube drive pedals - worth it?
  237. Music Angel XD-850MKIII 300b integrated amp
  238. 8150's
  239. More junk from China
  240. 6GM8 above 8mA/24V
  241. One Tube Sound Better Than Four?
  242. HK Citation V rebuild - any advice?
  243. 6GM8/ECC86
  244. Sound Valves vtp-101 Schematic
  245. ~17-18w sweep tube with large plate cap
  246. Fisher 500B Comparison
  247. New build of P-P PCL86 Amp
  248. Transformer question
  249. Can 110V Quad IIs be configured to 220V?
  250. Advice needed re repairing Audio Research VT100

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