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  1. Converting a dirty channel to clean?
  2. A few questions about transformer placement in an S5 K-12 tube amplifer
  3. Bogen AP30 and new member
  4. Adding Clean channel to AX84 P1-Ex
  5. Echocord Super 62 Feedback at Low Levels?
  6. Direct Coupled 76/5687 linestage
  7. Be kind to your 5AR4 and input capacitor
  8. New Self-Powered ROHS compliant electronic device invented!
  9. Making my first hifi tube amp.
  10. Variation on Rodīs bias servo
  11. "No Light District" P-P amplifier
  12. What kind of tubes do i have?
  13. Understanding Scope Trace Square Wave
  14. Single tube SE with EML-20B
  15. LED bias cathodyne
  16. Diagnosing hum???
  17. Posted tube microphone preamp design
  18. Finally put the Aikido in a proper chassis
  19. Tube Preamp / Headphone amp question...
  20. Phono Preamp
  21. Initial 'DQ5' testing
  22. Free Tube Amplifier Schematic Diagrams
  23. Testing with DMM
  24. The Impressive Vetruvio GM70 SET amp.
  25. Fender Twin Reverb channel 2 has no output
  26. 6sn7 subminature??
  27. One channel louder than other
  28. How to use RCP 802A tube tester test B9A tubes?
  29. phono amp question - adding input tx
  30. Ebay "clones" PCB
  31. Phase splitter and balance input
  32. At Last....First Build Complete...6V6/6SL7
  33. Amplifier input
  34. The Tube Maze
  35. Variable Harmonizer
  36. Vetruvio Audio; new competition for the Chinese?
  37. Transmitting tube-driven transmitting tube SET amp?
  38. Circlotron questions
  39. Home Grown tube amps
  40. LT108 Oscillation sounds like tube rush/white noise
  41. Cool looking tubes anyone...
  42. st70 standby switch/cathode stripping SS rect
  43. BoM for an RH84 mono build?
  44. Signal hum ideas please.
  45. E88CC turbo
  46. SRPP vs. plate loaded, musicality and details
  47. 300B/EL156 Amp
  48. Just new one .all new layout.
  49. Am I correct????
  50. Need help identifying this amp...
  51. The Maggie factor
  52. Help wiring up anLED Bar
  53. E810F/7788 Pinout name/number?
  54. Need some help with a mercury 1200 tube checker
  55. Adjust cathode bias pot - both channels move together. Why?
  56. Building a 45 SET
  57. Stereo Pententometer Questions
  58. Looking for oscilloscope recommendations.
  59. dm160 magic eye help
  60. Tube stage for acoustic guitar?
  61. Zener heater regulator
  62. Dead Time - Correcting for it
  63. ARC Power source+ 12AX7&12AU7 Pre-amplifier
  64. PTC Thermistor for auto fixed bias
  65. How do I calculate output power?
  66. Microcontrollers in tube amps
  67. Dynaco PAT4/Aikido tube preamp
  68. RCA red base 5691 / 5692
  69. Updating my amps....and "hello" :-)
  70. my first attempt
  71. Finished my first PP amp, 6SJ7-6SN7-6v6
  72. Triode PP OP stage combining Blumlein Garter and CCS bias - anyone tried this?
  73. 6U8 Revisited
  74. DePalma redux
  75. Could this be a perfectly linear triode?
  76. Grounding elevated ccs series filament supply
  77. What to do with E182CC's
  78. Angela EL34 opinions please
  79. Chinise 6N1 tube replacement
  80. Ridiculous Hallucinations
  81. Transformer Ratings
  82. dB Meter with tube circuit
  83. Suggestions for pp or se monos
  84. Low filament current tubes
  85. Tube Clearout
  86. First tube amp, it needs maintenance
  87. Need EF86 phono preamplifier shematic
  88. cannot locate documentation on SCA 9190 receiver
  89. Ecc88 pin 9 connection??
  90. VTL Compact100 Monoblock Blows Fuse
  91. 300b driver revisited.
  92. SYclotron schematic
  93. Hum problem
  94. Suppo el34
  95. my new tube experience
  96. LL1682PP Lundahl
  97. BP Ultrapath
  98. Tube shops/sellers in Kiev , Ukraine ?
  99. Headphones with tubes...
  100. A Triad xfmr for a voltage doubler PSU
  101. Ra-100
  102. Series Resistors on Outputs of Transformer?
  103. what's up !? new choke=subsonic pumping
  104. How to get the best out of the 6C33C-B?
  105. TO-220 PCB spacing for HV MOSFETs
  106. Deluxe Reverb Clone too "throaty"
  107. Using a Dynaco ST-70 audio transformer for a guitar amp
  108. Need input on Buffer stage to use in Preamp..
  109. quad output tube help
  110. "Stacking" power transformer secondaries?
  111. Tubes flare on start up!!
  112. Solid state rectifier for AC30 clone
  113. Grid Stopper Advice - Graphs Included!
  114. Western Electric settings for Hickok 600A?
  115. Wanted! single-ended 807 schematic
  116. sputtering 5u4 on diy Wheatfield amp
  117. Is this output transformer faulty?
  118. Help identify variac
  119. Schematic for TL Audio VP-5051 Voice Processor
  120. what's a good layout for a quad EL84 amp on this box?
  121. Scott 350B Tuner; Bridge Rectifier
  122. intermitent static pops from speakers st70
  123. baxandall type tone control for diff amp
  124. Stage amps using DHTs
  125. Tube+OP My headphono & preamp
  126. NFB Clarification
  127. James output transformers
  128. I just bought a an old valve amp
  129. Bias Curves
  130. Triode in Class B or Beam Pentode in Class AB2
  131. Elna Cerafine Caps
  132. help with calibrating a Tv7d/U military tube tester
  133. Cathode Follower driven Phase Inverters
  134. Help finding a tube tester for Stereo tube amps.
  135. Anything horribly wrong with this (LTP w/ LM317 as CCS)
  136. Zenith OPT question
  137. OT/Speaker impedance mismatch
  138. Goldilocks & the 3 (or more) preamp power supplies
  139. Using SE OT for PP.
  140. Need preamplifier schematic/suggestions
  141. Push-Pull vs Push-Pull-Parallel
  142. Odd/Crazy output transformer design?
  143. what 2A3 desgin recommented for home theater
  144. power supply for 10m45s
  145. How badly matched are your IXYS10M45S ?
  146. Class B Push-Pull
  147. Please comment on my design -and a few resistor values..
  148. How to lower even harmonic, keep odd one
  149. PC Mount 9-Pin Tube Socket Layout
  150. datasheet for type 52, help !!!
  151. Another kt88 Monoblock Builders Thread
  152. Question about stacked pawer supplies
  153. ys audio preamp
  154. Need help on 811A partial feedback
  155. Funny console, need ideas...
  156. SMPS experts come on in please!
  157. DC Filament supply boards
  158. Looking for vintage radio sound
  159. Channel death - Chinese EL34 PP
  160. JFET cascoded with tube gain calculation
  161. Fet 6Gk5 ECC88 mc phono stage
  162. Heathkit ol-1 oscilloscope help. Can't get solid spot during setup procedure.
  163. Operating a stereo amp in bridged mode
  164. Mic input Transformer from Triode Elect
  165. Power transformer for tube amp requirements
  166. Tape playback amp
  167. Tube for high input Z
  168. Eico 666 tube tester restoration - need grid control!
  169. Need Schematic/Manual Lambda 71
  170. Replace ECC83 preamp valve with E88CC(6922)
  171. Advice on 6P3S p-p amp schematic, feedback problem?
  172. 6S41S P-P Amp Initial Query
  173. El Cheapo, builders thread
  174. kbu608 rectifier
  175. Looking for nice sounding amp project
  176. B+ for EL84
  177. Output Transformer kt88 6550 pp, Wires? Jukebox? Help.
  178. OPT with foil secondaries
  179. Small Tube Pre Amp - Power Supply Cable
  180. Identification of unknown output transformer
  181. master volume with a extra tube
  182. 10 pounds of power for $15
  183. Unstable Eico HF-87
  184. DIY Dual Channel Active Tube Tone Control
  185. cant eliminate 50hz hum on just one side of the 6h6p headphoneamp
  186. question about the 866a
  187. Trade Custom Speaker Horns for Custom Amp
  188. TVA-1 valve amp - help
  189. Need to source a PSU chassis - simple steel
  190. What should I do with my Dynaco MKIII's
  191. inrush current
  192. Scott 222B output transformer : Compatibility and specs
  193. C3G/C3M Prices
  194. 5v3, 5u4, 5u4gb, 5u4gbm, 5931?
  195. transformer for quad EL84 SE amp - will Antek 360v work
  196. Best Possible Tube Headphone Amp
  197. Help with cheap mono SE
  198. Millkido 24
  199. 60W mono's design help
  200. Psu question - best place for the caps?
  201. 1.2W guitar amp useing:6N2P and 6N1P russian tubes.
  202. RCA jacks
  203. Hickok 530-B tester charts wanted
  204. comparison of heater termination noise
  205. Some questions about an amplifier design
  206. 2nd harmonic feedback
  207. idea's for a valve preamp
  208. Best line stage tube?
  209. Bias Adjustment point
  210. Looking for a Williamson squematics
  211. Magnavox Console Speaker Impedances
  212. first tube amp
  213. Beam Triodes
  214. Winding output transformers
  215. Anyone Have a Schematic for Wavac MD300B?
  216. PushPull vs ParalelSE
  217. Painting transformer end bells
  218. all-octal schaded pp
  219. New Wood Chassis from Hammond
  220. Strange Noise From Amp
  221. Missing components
  222. Tube headphone amplifier.
  223. Emission - Double Triode
  224. Convergent Audio Technology - where is their Hompage?
  225. Mesh Plate
  226. Cathode follower question
  227. Power supply question
  228. Looking for a 866a powersupply schematic
  229. 211 or 845 project
  230. Modify Dynaco MKIII to use 6AR6s ?
  231. Yet another Dyna ST-70 Input Board
  232. Free Download Vacuum Tube Design Book
  233. driver stage for ppp 6550's
  234. power supply problem
  235. Positive/Negative Feedback
  236. Unholy Alliance Phono Amp
  237. Shrink a tube amp
  238. lampizator srpp help
  239. the secret of best preamplifier
  240. Any issues with adding a grounded power cord to a Heathkit IT-17 tube tester?
  241. HELP to ID push pull/Single Ende
  242. 12BH7,6414,and 12AT7 to drive EL34 better
  243. Testing Tube Amplifiers
  244. trade off higher HT current for lower filament current ?
  245. Any Russian analog of 12BY7 ?
  246. SV572-10 still being made?
  247. PP Output Transformer Testing Puzzle
  248. baby steps
  249. Partial FB: 2 SE + 1 PI = PP?
  250. G-807=807 SE or PP?

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