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  1. Valve Preamp for voice / guitar purpose
  2. 851 set?
  3. dual cathode follower problem
  4. Question about connecting grounds
  5. Is it okay for capacitors to be close to the main power transformer in S5 K-12 Kit?
  6. Fisher 500C Schematic
  7. looking for PP 6l6 schematic
  8. Muiscal Paradise MP-301 6V6 amp.
  9. First Build - PS Voltage Question?
  10. Need help about an hybrid amp circuit
  11. Radio to guitaramp conversion hum problem
  12. Pioneer SX-348 - Service manual?
  13. Tube PS for mic preamp Help
  14. Add rectifier tube to yaqin mc10l? What size is best?
  15. global negative feedback schematic
  16. Signal transformer question
  17. What speaker system for tube amplifier
  18. 39/44 Tube
  19. tube-aholics anonymous ?
  20. 12AX7 heaters from 9VAC transformer
  21. Cant stop Aikido Humming
  22. Suggestions for rotary switches
  23. Question about potential transformer placement in K-12 Kit
  24. Extra pins on replacement potentiometer for K-12 tube kit?
  25. Instrument tube / valve preamp
  26. SRPP - issues understanding how to increase current
  27. ARC Power source+Marantz 7C(PCB edition)
  28. Repair and adjustment tips
  29. trimax output transformer TA2444
  30. anyone recognize this valve?
  31. Microphone Preamp design
  32. 6CM5 hi-fi amplifier
  33. Building an amp try #2
  34. Can the 6S33S/6C33C be mounted horizontally?
  35. A heptode question
  36. Looking for a 807 amp with 4 pairs of 807's
  37. pp output transformer miniblok2
  38. John Swenson's BDT preamp - finally!!
  39. Voice of Music console 816
  40. Steve Bench 1 tube reg in all glass
  41. Conn Caprice 427 needs new 12AU7 tubes—advice?
  42. Position of Iron in Can of HK Citation II Output Transformers
  43. Bottle size,does it matter in matched quads?
  44. Heater Pots?
  45. Current calculation from datasheet
  46. Any one ever seen this amp?
  47. Guiguang 300B for 300Beast.....
  48. FLEA PPP, all ecc99
  49. Well, it is time to start thinking about winter projects. GM70
  50. aghhh is my tube okay?
  51. Grid Bias provided by transformer secondary winding, what is this stuff about?
  52. Zener regulated supplies
  53. OPT fore drive ribbon speaker directly; why not ?
  54. van Dorn's Octode design - recommendations for a 10W/ch version
  55. Outrageous Speaker/Amplifier Idea
  56. Anyone ever made the EL84 P-P circuit referenced on the Tubecad Journal site?
  57. Scratchy volume pot on TAD DIY deluxe reverb
  58. Cathode Follower ideas please.....
  59. Anyone used the NTE1866 VU LED driver?
  60. Any potential problems when using a combo potentiometer / power switch on a K-12 kit?
  61. Help needed understanding component values.
  62. Separate passive pre and monoblocks?
  63. My new diy site
  64. Valves and musical instruments
  65. My DC Darling
  66. Question - add LED power indicator to Aikido pre
  67. Colorful amps
  68. Aikido Cathode Follower
  69. Converting a dirty channel to clean?
  70. A few questions about transformer placement in an S5 K-12 tube amplifer
  71. Bogen AP30 and new member
  72. Adding Clean channel to AX84 P1-Ex
  73. Echocord Super 62 Feedback at Low Levels?
  74. Direct Coupled 76/5687 linestage
  75. Be kind to your 5AR4 and input capacitor
  76. New Self-Powered ROHS compliant electronic device invented!
  77. Making my first hifi tube amp.
  78. Variation on Rodīs bias servo
  79. "No Light District" P-P amplifier
  80. What kind of tubes do i have?
  81. Understanding Scope Trace Square Wave
  82. Single tube SE with EML-20B
  83. LED bias cathodyne
  84. Diagnosing hum???
  85. Posted tube microphone preamp design
  86. Finally put the Aikido in a proper chassis
  87. Tube Preamp / Headphone amp question...
  88. Phono Preamp
  89. Initial 'DQ5' testing
  90. Free Tube Amplifier Schematic Diagrams
  91. Testing with DMM
  92. The Impressive Vetruvio GM70 SET amp.
  93. Fender Twin Reverb channel 2 has no output
  94. 6sn7 subminature??
  95. One channel louder than other
  96. How to use RCP 802A tube tester test B9A tubes?
  97. phono amp question - adding input tx
  98. Ebay "clones" PCB
  99. Phase splitter and balance input
  100. At Last....First Build Complete...6V6/6SL7
  101. Amplifier input
  102. The Tube Maze
  103. Variable Harmonizer
  104. Vetruvio Audio; new competition for the Chinese?
  105. Transmitting tube-driven transmitting tube SET amp?
  106. Circlotron questions
  107. Home Grown tube amps
  108. LT108 Oscillation sounds like tube rush/white noise
  109. Cool looking tubes anyone...
  110. st70 standby switch/cathode stripping SS rect
  111. BoM for an RH84 mono build?
  112. Signal hum ideas please.
  113. E88CC turbo
  114. SRPP vs. plate loaded, musicality and details
  115. 300B/EL156 Amp
  116. Just new one .all new layout.
  117. Am I correct????
  118. Need help identifying this amp...
  119. The Maggie factor
  120. Help wiring up anLED Bar
  121. E810F/7788 Pinout name/number?
  122. Need some help with a mercury 1200 tube checker
  123. Adjust cathode bias pot - both channels move together. Why?
  124. Building a 45 SET
  125. Stereo Pententometer Questions
  126. Looking for oscilloscope recommendations.
  127. dm160 magic eye help
  128. Tube stage for acoustic guitar?
  129. Zener heater regulator
  130. Dead Time - Correcting for it
  131. ARC Power source+ 12AX7&12AU7 Pre-amplifier
  132. PTC Thermistor for auto fixed bias
  133. How do I calculate output power?
  134. Microcontrollers in tube amps
  135. Dynaco PAT4/Aikido tube preamp
  136. RCA red base 5691 / 5692
  137. Updating my amps....and "hello" :-)
  138. my first attempt
  139. Finished my first PP amp, 6SJ7-6SN7-6v6
  140. Triode PP OP stage combining Blumlein Garter and CCS bias - anyone tried this?
  141. 6U8 Revisited
  142. DePalma redux
  143. Could this be a perfectly linear triode?
  144. Grounding elevated ccs series filament supply
  145. What to do with E182CC's
  146. Angela EL34 opinions please
  147. Chinise 6N1 tube replacement
  148. Ridiculous Hallucinations
  149. Transformer Ratings
  150. dB Meter with tube circuit
  151. Suggestions for pp or se monos
  152. Low filament current tubes
  153. Tube Clearout
  154. First tube amp, it needs maintenance
  155. Need EF86 phono preamplifier shematic
  156. cannot locate documentation on SCA 9190 receiver
  157. Ecc88 pin 9 connection??
  158. VTL Compact100 Monoblock Blows Fuse
  159. 300b driver revisited.
  160. SYclotron schematic
  161. Hum problem
  162. Suppo el34
  163. my new tube experience
  164. LL1682PP Lundahl
  165. BP Ultrapath
  166. Tube shops/sellers in Kiev , Ukraine ?
  167. Headphones with tubes...
  168. A Triad xfmr for a voltage doubler PSU
  169. Ra-100
  170. Series Resistors on Outputs of Transformer?
  171. what's up !? new choke=subsonic pumping
  172. How to get the best out of the 6C33C-B?
  173. TO-220 PCB spacing for HV MOSFETs
  174. Deluxe Reverb Clone too "throaty"
  175. Using a Dynaco ST-70 audio transformer for a guitar amp
  176. Need input on Buffer stage to use in Preamp..
  177. quad output tube help
  178. "Stacking" power transformer secondaries?
  179. Tubes flare on start up!!
  180. Solid state rectifier for AC30 clone
  181. Grid Stopper Advice - Graphs Included!
  182. Western Electric settings for Hickok 600A?
  183. Wanted! single-ended 807 schematic
  184. sputtering 5u4 on diy Wheatfield amp
  185. Is this output transformer faulty?
  186. Help identify variac
  187. Schematic for TL Audio VP-5051 Voice Processor
  188. what's a good layout for a quad EL84 amp on this box?
  189. Scott 350B Tuner; Bridge Rectifier
  190. intermitent static pops from speakers st70
  191. baxandall type tone control for diff amp
  192. Stage amps using DHTs
  193. Tube+OP My headphono & preamp
  194. NFB Clarification
  195. James output transformers
  196. I just bought a an old valve amp
  197. Bias Curves
  198. Triode in Class B or Beam Pentode in Class AB2
  199. Elna Cerafine Caps
  200. help with calibrating a Tv7d/U military tube tester
  201. Cathode Follower driven Phase Inverters
  202. Help finding a tube tester for Stereo tube amps.
  203. Anything horribly wrong with this (LTP w/ LM317 as CCS)
  204. Zenith OPT question
  205. OT/Speaker impedance mismatch
  206. Goldilocks & the 3 (or more) preamp power supplies
  207. Using SE OT for PP.
  208. Need preamplifier schematic/suggestions
  209. Push-Pull vs Push-Pull-Parallel
  210. Odd/Crazy output transformer design?
  211. what 2A3 desgin recommented for home theater
  212. power supply for 10m45s
  213. How badly matched are your IXYS10M45S ?
  214. Class B Push-Pull
  215. Please comment on my design -and a few resistor values..
  216. How to lower even harmonic, keep odd one
  217. PC Mount 9-Pin Tube Socket Layout
  218. datasheet for type 52, help !!!
  219. Another kt88 Monoblock Builders Thread
  220. Question about stacked pawer supplies
  221. ys audio preamp
  222. Need help on 811A partial feedback
  223. Funny console, need ideas...
  224. SMPS experts come on in please!
  225. DC Filament supply boards
  226. Looking for vintage radio sound
  227. Channel death - Chinese EL34 PP
  228. JFET cascoded with tube gain calculation
  229. Fet 6Gk5 ECC88 mc phono stage
  230. Heathkit ol-1 oscilloscope help. Can't get solid spot during setup procedure.
  231. Operating a stereo amp in bridged mode
  232. Mic input Transformer from Triode Elect
  233. Power transformer for tube amp requirements
  234. Tape playback amp
  235. Tube for high input Z
  236. Eico 666 tube tester restoration - need grid control!
  237. Need Schematic/Manual Lambda 71
  238. Replace ECC83 preamp valve with E88CC(6922)
  239. Advice on 6P3S p-p amp schematic, feedback problem?
  240. 6S41S P-P Amp Initial Query
  241. El Cheapo, builders thread
  242. kbu608 rectifier
  243. Looking for nice sounding amp project
  244. B+ for EL84
  245. Output Transformer kt88 6550 pp, Wires? Jukebox? Help.
  246. OPT with foil secondaries
  247. Small Tube Pre Amp - Power Supply Cable
  248. Identification of unknown output transformer
  249. master volume with a extra tube
  250. 10 pounds of power for $15

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