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  1. Single tube SE with EML-20B
  2. LED bias cathodyne
  3. Diagnosing hum???
  4. Posted tube microphone preamp design
  5. Finally put the Aikido in a proper chassis
  6. Tube Preamp / Headphone amp question...
  7. Phono Preamp
  8. Initial 'DQ5' testing
  9. Free Tube Amplifier Schematic Diagrams
  10. Testing with DMM
  11. The Impressive Vetruvio GM70 SET amp.
  12. Fender Twin Reverb channel 2 has no output
  13. 6sn7 subminature??
  14. One channel louder than other
  15. How to use RCP 802A tube tester test B9A tubes?
  16. phono amp question - adding input tx
  17. Ebay "clones" PCB
  18. Phase splitter and balance input
  19. At Last....First Build Complete...6V6/6SL7
  20. Amplifier input
  21. The Tube Maze
  22. Variable Harmonizer
  23. Vetruvio Audio; new competition for the Chinese?
  24. Transmitting tube-driven transmitting tube SET amp?
  25. Circlotron questions
  26. Home Grown tube amps
  27. LT108 Oscillation sounds like tube rush/white noise
  28. Cool looking tubes anyone...
  29. st70 standby switch/cathode stripping SS rect
  30. BoM for an RH84 mono build?
  31. Signal hum ideas please.
  32. E88CC turbo
  33. SRPP vs. plate loaded, musicality and details
  34. 300B/EL156 Amp
  35. Just new one .all new layout.
  36. Am I correct????
  37. Need help identifying this amp...
  38. The Maggie factor
  39. Help wiring up anLED Bar
  40. E810F/7788 Pinout name/number?
  41. Need some help with a mercury 1200 tube checker
  42. Adjust cathode bias pot - both channels move together. Why?
  43. Building a 45 SET
  44. Stereo Pententometer Questions
  45. Looking for oscilloscope recommendations.
  46. dm160 magic eye help
  47. Tube stage for acoustic guitar?
  48. Zener heater regulator
  49. Dead Time - Correcting for it
  50. ARC Power source+ 12AX7&12AU7 Pre-amplifier
  51. PTC Thermistor for auto fixed bias
  52. How do I calculate output power?
  53. Microcontrollers in tube amps
  54. Dynaco PAT4/Aikido tube preamp
  55. RCA red base 5691 / 5692
  56. Updating my amps....and "hello" :-)
  57. my first attempt
  58. Finished my first PP amp, 6SJ7-6SN7-6v6
  59. Triode PP OP stage combining Blumlein Garter and CCS bias - anyone tried this?
  60. 6U8 Revisited
  61. DePalma redux
  62. Could this be a perfectly linear triode?
  63. Grounding elevated ccs series filament supply
  64. What to do with E182CC's
  65. Angela EL34 opinions please
  66. Chinise 6N1 tube replacement
  67. Ridiculous Hallucinations
  68. Transformer Ratings
  69. dB Meter with tube circuit
  70. Suggestions for pp or se monos
  71. Low filament current tubes
  72. Tube Clearout
  73. First tube amp, it needs maintenance
  74. Need EF86 phono preamplifier shematic
  75. cannot locate documentation on SCA 9190 receiver
  76. Ecc88 pin 9 connection??
  77. VTL Compact100 Monoblock Blows Fuse
  78. 300b driver revisited.
  79. SYclotron schematic
  80. Hum problem
  81. Suppo el34
  82. my new tube experience
  83. LL1682PP Lundahl
  84. BP Ultrapath
  85. Tube shops/sellers in Kiev , Ukraine ?
  86. Headphones with tubes...
  87. A Triad xfmr for a voltage doubler PSU
  88. Ra-100
  89. Series Resistors on Outputs of Transformer?
  90. what's up !? new choke=subsonic pumping
  91. How to get the best out of the 6C33C-B?
  92. TO-220 PCB spacing for HV MOSFETs
  93. Deluxe Reverb Clone too "throaty"
  94. Using a Dynaco ST-70 audio transformer for a guitar amp
  95. Need input on Buffer stage to use in Preamp..
  96. quad output tube help
  97. "Stacking" power transformer secondaries?
  98. Tubes flare on start up!!
  99. Solid state rectifier for AC30 clone
  100. Grid Stopper Advice - Graphs Included!
  101. Western Electric settings for Hickok 600A?
  102. Wanted! single-ended 807 schematic
  103. sputtering 5u4 on diy Wheatfield amp
  104. Is this output transformer faulty?
  105. Help identify variac
  106. Schematic for TL Audio VP-5051 Voice Processor
  107. what's a good layout for a quad EL84 amp on this box?
  108. Scott 350B Tuner; Bridge Rectifier
  109. intermitent static pops from speakers st70
  110. baxandall type tone control for diff amp
  111. Stage amps using DHTs
  112. Tube+OP My headphono & preamp
  113. NFB Clarification
  114. James output transformers
  115. I just bought a an old valve amp
  116. Bias Curves
  117. Triode in Class B or Beam Pentode in Class AB2
  118. Elna Cerafine Caps
  119. help with calibrating a Tv7d/U military tube tester
  120. Cathode Follower driven Phase Inverters
  121. Help finding a tube tester for Stereo tube amps.
  122. Anything horribly wrong with this (LTP w/ LM317 as CCS)
  123. Zenith OPT question
  124. OT/Speaker impedance mismatch
  125. Goldilocks & the 3 (or more) preamp power supplies
  126. Using SE OT for PP.
  127. Need preamplifier schematic/suggestions
  128. Push-Pull vs Push-Pull-Parallel
  129. Odd/Crazy output transformer design?
  130. what 2A3 desgin recommented for home theater
  131. power supply for 10m45s
  132. How badly matched are your IXYS10M45S ?
  133. Class B Push-Pull
  134. Please comment on my design -and a few resistor values..
  135. How to lower even harmonic, keep odd one
  136. PC Mount 9-Pin Tube Socket Layout
  137. datasheet for type 52, help !!!
  138. Another kt88 Monoblock Builders Thread
  139. Question about stacked pawer supplies
  140. ys audio preamp
  141. Need help on 811A partial feedback
  142. Funny console, need ideas...
  143. SMPS experts come on in please!
  144. DC Filament supply boards
  145. Looking for vintage radio sound
  146. Channel death - Chinese EL34 PP
  147. JFET cascoded with tube gain calculation
  148. Fet 6Gk5 ECC88 mc phono stage
  149. Heathkit ol-1 oscilloscope help. Can't get solid spot during setup procedure.
  150. Operating a stereo amp in bridged mode
  151. Mic input Transformer from Triode Elect
  152. Power transformer for tube amp requirements
  153. Tape playback amp
  154. Tube for high input Z
  155. Eico 666 tube tester restoration - need grid control!
  156. Need Schematic/Manual Lambda 71
  157. Replace ECC83 preamp valve with E88CC(6922)
  158. Advice on 6P3S p-p amp schematic, feedback problem?
  159. 6S41S P-P Amp Initial Query
  160. El Cheapo, builders thread
  161. kbu608 rectifier
  162. Looking for nice sounding amp project
  163. B+ for EL84
  164. Output Transformer kt88 6550 pp, Wires? Jukebox? Help.
  165. OPT with foil secondaries
  166. Small Tube Pre Amp - Power Supply Cable
  167. Identification of unknown output transformer
  168. master volume with a extra tube
  169. 10 pounds of power for $15
  170. Unstable Eico HF-87
  171. DIY Dual Channel Active Tube Tone Control
  172. cant eliminate 50hz hum on just one side of the 6h6p headphoneamp
  173. question about the 866a
  174. Trade Custom Speaker Horns for Custom Amp
  175. TVA-1 valve amp - help
  176. Need to source a PSU chassis - simple steel
  177. What should I do with my Dynaco MKIII's
  178. inrush current
  179. Scott 222B output transformer : Compatibility and specs
  180. C3G/C3M Prices
  181. 5v3, 5u4, 5u4gb, 5u4gbm, 5931?
  182. transformer for quad EL84 SE amp - will Antek 360v work
  183. Best Possible Tube Headphone Amp
  184. Help with cheap mono SE
  185. Millkido 24
  186. 60W mono's design help
  187. Psu question - best place for the caps?
  188. 1.2W guitar amp useing:6N2P and 6N1P russian tubes.
  189. RCA jacks
  190. Hickok 530-B tester charts wanted
  191. comparison of heater termination noise
  192. Some questions about an amplifier design
  193. 2nd harmonic feedback
  194. idea's for a valve preamp
  195. Best line stage tube?
  196. Bias Adjustment point
  197. Looking for a Williamson squematics
  198. Magnavox Console Speaker Impedances
  199. first tube amp
  200. Beam Triodes
  201. Winding output transformers
  202. Anyone Have a Schematic for Wavac MD300B?
  203. PushPull vs ParalelSE
  204. Painting transformer end bells
  205. all-octal schaded pp
  206. New Wood Chassis from Hammond
  207. Strange Noise From Amp
  208. Missing components
  209. Tube headphone amplifier.
  210. Emission - Double Triode
  211. Convergent Audio Technology - where is their Hompage?
  212. Mesh Plate
  213. Cathode follower question
  214. Power supply question
  215. Looking for a 866a powersupply schematic
  216. 211 or 845 project
  217. Modify Dynaco MKIII to use 6AR6s ?
  218. Yet another Dyna ST-70 Input Board
  219. Free Download Vacuum Tube Design Book
  220. driver stage for ppp 6550's
  221. power supply problem
  222. Positive/Negative Feedback
  223. Unholy Alliance Phono Amp
  224. Shrink a tube amp
  225. lampizator srpp help
  226. the secret of best preamplifier
  227. Any issues with adding a grounded power cord to a Heathkit IT-17 tube tester?
  228. HELP to ID push pull/Single Ende
  229. 12BH7,6414,and 12AT7 to drive EL34 better
  230. Testing Tube Amplifiers
  231. trade off higher HT current for lower filament current ?
  232. Any Russian analog of 12BY7 ?
  233. SV572-10 still being made?
  234. PP Output Transformer Testing Puzzle
  235. baby steps
  236. Partial FB: 2 SE + 1 PI = PP?
  237. G-807=807 SE or PP?
  238. 1Hz oscillation with CCS biased output valves
  239. Ultra-linear 6L6 output stage
  240. Transformer or capacitor coupling?
  241. Victor (JVC) Tube Amp MCM-200
  242. MiniWatt N3 problems, oscillation thumping and RF/motor problems.
  243. A2293 pins connection, help !!!
  244. Start-Up Delay for tube amp !
  245. Getting OPT in Japan?
  246. cathode follower tube buffer using 6n6p
  247. Buzz at output until tubes conduct
  248. I need help for amps.
  249. UL Connection results in higher distortion
  250. Header bypass Cap?

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