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  1. Tube PS for mic preamp Help
  2. Add rectifier tube to yaqin mc10l? What size is best?
  3. global negative feedback schematic
  4. Signal transformer question
  5. What speaker system for tube amplifier
  6. 39/44 Tube
  7. tube-aholics anonymous ?
  8. 12AX7 heaters from 9VAC transformer
  9. Cant stop Aikido Humming
  10. Suggestions for rotary switches
  11. Question about potential transformer placement in K-12 Kit
  12. Extra pins on replacement potentiometer for K-12 tube kit?
  13. Instrument tube / valve preamp
  14. SRPP - issues understanding how to increase current
  15. ARC Power source+Marantz 7C(PCB edition)
  16. Repair and adjustment tips
  17. trimax output transformer TA2444
  18. anyone recognize this valve?
  19. Microphone Preamp design
  20. 6CM5 hi-fi amplifier
  21. Building an amp try #2
  22. Can the 6S33S/6C33C be mounted horizontally?
  23. A heptode question
  24. Looking for a 807 amp with 4 pairs of 807's
  25. pp output transformer miniblok2
  26. John Swenson's BDT preamp - finally!!
  27. Voice of Music console 816
  28. Steve Bench 1 tube reg in all glass
  29. Conn Caprice 427 needs new 12AU7 tubes—advice?
  30. Position of Iron in Can of HK Citation II Output Transformers
  31. Bottle size,does it matter in matched quads?
  32. Heater Pots?
  33. Current calculation from datasheet
  34. Any one ever seen this amp?
  35. Guiguang 300B for 300Beast.....
  36. FLEA PPP, all ecc99
  37. Well, it is time to start thinking about winter projects. GM70
  38. aghhh is my tube okay?
  39. Grid Bias provided by transformer secondary winding, what is this stuff about?
  40. Zener regulated supplies
  41. OPT fore drive ribbon speaker directly; why not ?
  42. van Dorn's Octode design - recommendations for a 10W/ch version
  43. Outrageous Speaker/Amplifier Idea
  44. Anyone ever made the EL84 P-P circuit referenced on the Tubecad Journal site?
  45. Scratchy volume pot on TAD DIY deluxe reverb
  46. Cathode Follower ideas please.....
  47. Anyone used the NTE1866 VU LED driver?
  48. Any potential problems when using a combo potentiometer / power switch on a K-12 kit?
  49. Help needed understanding component values.
  50. Separate passive pre and monoblocks?
  51. My new diy site
  52. Valves and musical instruments
  53. My DC Darling
  54. Question - add LED power indicator to Aikido pre
  55. Colorful amps
  56. Aikido Cathode Follower
  57. Converting a dirty channel to clean?
  58. A few questions about transformer placement in an S5 K-12 tube amplifer
  59. Bogen AP30 and new member
  60. Adding Clean channel to AX84 P1-Ex
  61. Echocord Super 62 Feedback at Low Levels?
  62. Direct Coupled 76/5687 linestage
  63. Be kind to your 5AR4 and input capacitor
  64. New Self-Powered ROHS compliant electronic device invented!
  65. Making my first hifi tube amp.
  66. Variation on Rodīs bias servo
  67. "No Light District" P-P amplifier
  68. What kind of tubes do i have?
  69. Understanding Scope Trace Square Wave
  70. Single tube SE with EML-20B
  71. LED bias cathodyne
  72. Diagnosing hum???
  73. Posted tube microphone preamp design
  74. Finally put the Aikido in a proper chassis
  75. Tube Preamp / Headphone amp question...
  76. Phono Preamp
  77. Initial 'DQ5' testing
  78. Free Tube Amplifier Schematic Diagrams
  79. Testing with DMM
  80. The Impressive Vetruvio GM70 SET amp.
  81. Fender Twin Reverb channel 2 has no output
  82. 6sn7 subminature??
  83. One channel louder than other
  84. How to use RCP 802A tube tester test B9A tubes?
  85. phono amp question - adding input tx
  86. Ebay "clones" PCB
  87. Phase splitter and balance input
  88. At Last....First Build Complete...6V6/6SL7
  89. Amplifier input
  90. The Tube Maze
  91. Variable Harmonizer
  92. Vetruvio Audio; new competition for the Chinese?
  93. Transmitting tube-driven transmitting tube SET amp?
  94. Circlotron questions
  95. Home Grown tube amps
  96. LT108 Oscillation sounds like tube rush/white noise
  97. Cool looking tubes anyone...
  98. st70 standby switch/cathode stripping SS rect
  99. BoM for an RH84 mono build?
  100. Signal hum ideas please.
  101. E88CC turbo
  102. SRPP vs. plate loaded, musicality and details
  103. 300B/EL156 Amp
  104. Just new one .all new layout.
  105. Am I correct????
  106. Need help identifying this amp...
  107. The Maggie factor
  108. Help wiring up anLED Bar
  109. E810F/7788 Pinout name/number?
  110. Need some help with a mercury 1200 tube checker
  111. Adjust cathode bias pot - both channels move together. Why?
  112. Building a 45 SET
  113. Stereo Pententometer Questions
  114. Looking for oscilloscope recommendations.
  115. dm160 magic eye help
  116. Zener heater regulator
  117. Dead Time - Correcting for it
  118. ARC Power source+ 12AX7&12AU7 Pre-amplifier
  119. PTC Thermistor for auto fixed bias
  120. How do I calculate output power?
  121. Microcontrollers in tube amps
  122. Dynaco PAT4/Aikido tube preamp
  123. RCA red base 5691 / 5692
  124. Updating my amps....and "hello" :-)
  125. my first attempt
  126. Finished my first PP amp, 6SJ7-6SN7-6v6
  127. Triode PP OP stage combining Blumlein Garter and CCS bias - anyone tried this?
  128. 6U8 Revisited
  129. DePalma redux
  130. Could this be a perfectly linear triode?
  131. Grounding elevated ccs series filament supply
  132. What to do with E182CC's
  133. Angela EL34 opinions please
  134. Chinise 6N1 tube replacement
  135. Ridiculous Hallucinations
  136. Transformer Ratings
  137. dB Meter with tube circuit
  138. Suggestions for pp or se monos
  139. Low filament current tubes
  140. Tube Clearout
  141. First tube amp, it needs maintenance
  142. Need EF86 phono preamplifier shematic
  143. cannot locate documentation on SCA 9190 receiver
  144. Ecc88 pin 9 connection??
  145. VTL Compact100 Monoblock Blows Fuse
  146. 300b driver revisited.
  147. SYclotron schematic
  148. Hum problem
  149. Suppo el34
  150. my new tube experience
  151. LL1682PP Lundahl
  152. BP Ultrapath
  153. Tube shops/sellers in Kiev , Ukraine ?
  154. Headphones with tubes...
  155. A Triad xfmr for a voltage doubler PSU
  156. Ra-100
  157. Series Resistors on Outputs of Transformer?
  158. what's up !? new choke=subsonic pumping
  159. How to get the best out of the 6C33C-B?
  160. TO-220 PCB spacing for HV MOSFETs
  161. Deluxe Reverb Clone too "throaty"
  162. Using a Dynaco ST-70 audio transformer for a guitar amp
  163. Need input on Buffer stage to use in Preamp..
  164. quad output tube help
  165. "Stacking" power transformer secondaries?
  166. Tubes flare on start up!!
  167. Solid state rectifier for AC30 clone
  168. Grid Stopper Advice - Graphs Included!
  169. Western Electric settings for Hickok 600A?
  170. Wanted! single-ended 807 schematic
  171. sputtering 5u4 on diy Wheatfield amp
  172. Is this output transformer faulty?
  173. Help identify variac
  174. Schematic for TL Audio VP-5051 Voice Processor
  175. what's a good layout for a quad EL84 amp on this box?
  176. Scott 350B Tuner; Bridge Rectifier
  177. intermitent static pops from speakers st70
  178. baxandall type tone control for diff amp
  179. Stage amps using DHTs
  180. Tube+OP My headphono & preamp
  181. NFB Clarification
  182. James output transformers
  183. I just bought a an old valve amp
  184. Bias Curves
  185. Triode in Class B or Beam Pentode in Class AB2
  186. Elna Cerafine Caps
  187. help with calibrating a Tv7d/U military tube tester
  188. Cathode Follower driven Phase Inverters
  189. Help finding a tube tester for Stereo tube amps.
  190. Anything horribly wrong with this (LTP w/ LM317 as CCS)
  191. Zenith OPT question
  192. OT/Speaker impedance mismatch
  193. Goldilocks & the 3 (or more) preamp power supplies
  194. Using SE OT for PP.
  195. Need preamplifier schematic/suggestions
  196. Push-Pull vs Push-Pull-Parallel
  197. Odd/Crazy output transformer design?
  198. what 2A3 desgin recommented for home theater
  199. power supply for 10m45s
  200. How badly matched are your IXYS10M45S ?
  201. Class B Push-Pull
  202. Please comment on my design -and a few resistor values..
  203. How to lower even harmonic, keep odd one
  204. PC Mount 9-Pin Tube Socket Layout
  205. datasheet for type 52, help !!!
  206. Another kt88 Monoblock Builders Thread
  207. Question about stacked pawer supplies
  208. ys audio preamp
  209. Need help on 811A partial feedback
  210. Funny console, need ideas...
  211. SMPS experts come on in please!
  212. DC Filament supply boards
  213. Looking for vintage radio sound
  214. Channel death - Chinese EL34 PP
  215. JFET cascoded with tube gain calculation
  216. Fet 6Gk5 ECC88 mc phono stage
  217. Heathkit ol-1 oscilloscope help. Can't get solid spot during setup procedure.
  218. Operating a stereo amp in bridged mode
  219. Mic input Transformer from Triode Elect
  220. Power transformer for tube amp requirements
  221. Tape playback amp
  222. Tube for high input Z
  223. Eico 666 tube tester restoration - need grid control!
  224. Need Schematic/Manual Lambda 71
  225. Replace ECC83 preamp valve with E88CC(6922)
  226. Advice on 6P3S p-p amp schematic, feedback problem?
  227. 6S41S P-P Amp Initial Query
  228. El Cheapo, builders thread
  229. kbu608 rectifier
  230. Looking for nice sounding amp project
  231. B+ for EL84
  232. Output Transformer kt88 6550 pp, Wires? Jukebox? Help.
  233. OPT with foil secondaries
  234. Small Tube Pre Amp - Power Supply Cable
  235. Identification of unknown output transformer
  236. master volume with a extra tube
  237. 10 pounds of power for $15
  238. Unstable Eico HF-87
  239. DIY Dual Channel Active Tube Tone Control
  240. cant eliminate 50hz hum on just one side of the 6h6p headphoneamp
  241. question about the 866a
  242. Trade Custom Speaker Horns for Custom Amp
  243. TVA-1 valve amp - help
  244. Need to source a PSU chassis - simple steel
  245. What should I do with my Dynaco MKIII's
  246. inrush current
  247. Scott 222B output transformer : Compatibility and specs
  248. C3G/C3M Prices
  249. 5v3, 5u4, 5u4gb, 5u4gbm, 5931?
  250. transformer for quad EL84 SE amp - will Antek 360v work

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