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  1. Looking for PP 7027a shematic
  2. So, if it's not DIY Gene, then what?
  3. What driver tube for 200Vrms?
  4. Tube socket purchase
  5. Something I found interesting a while ago!
  6. Eico HF-22 Circuit
  7. SEDHT amp - decisions decisions
  8. Confused with designing
  9. Digitally controlled analog attenuator
  10. Purchased my 1st valve amp and can only get one channel working, please help!
  11. Another silly tube yesting question
  12. potentially very stupid questions....
  13. Tube rectifier: AZ1, AZ31, AZ50 vs 5u4
  14. Tube Square-Law, what and how to set up?
  15. Need help finding schematic. Conn 720
  16. OPT for parafeed SE
  17. Anyone else tried an opamp as a driver?
  18. e180f/6688 pentode operting points
  19. power supply reassignment problem
  20. Mains power transformer on S5 K-12 kit hums?
  21. Oriole OPT
  22. 26DQ5's vs 26HU5's vs 6KN6's and transformers
  23. SRPP power using power tranny as OPT?
  24. Need guidance with heathkit SA-2 refurbish/mods
  25. B+ discharge times!
  26. 26HU5's....and a confession
  27. Bell Sound Systems Pacemaker Model 2220
  28. Any thoughts on this transformer on eBay?
  29. Need some help figuring out a Wurlitzer 6240.
  30. Bypassing cathode resistor on pp power tube
  31. Is it safe to use a 8BQ5 in place of a 6BQ5 in a guitar amp?
  32. TRIODE Voltage amp + Power OP output follower
  33. Cats and tube-a-holics
  34. Replace Tube Rectifier With Weber CC?
  35. 717a 2 stage SE amplifier
  36. Thoughts on Oatley K282 Valve Preamp?
  37. SS rectifier for SimpleSE and others...
  38. Need match Pr KT-88
  39. EL34 PP - again !!!
  40. S5 K-12 Kit sounds excellent with iPod, but relatively low volume with turntable?
  41. Finished K-12 Kit with cedar / brass chassis (pics)
  42. Groove Tube Dual 75 schematics
  43. Tubes HOT!
  44. Meng volume pot problem
  45. Use P-P OPT for SE?
  46. Safety ?
  47. Film caps always better than lytics?
  48. Valve Preamp for voice / guitar purpose
  49. 851 set?
  50. dual cathode follower problem
  51. Question about connecting grounds
  52. Is it okay for capacitors to be close to the main power transformer in S5 K-12 Kit?
  53. Fisher 500C Schematic
  54. looking for PP 6l6 schematic
  55. Muiscal Paradise MP-301 6V6 amp.
  56. First Build - PS Voltage Question?
  57. Need help about an hybrid amp circuit
  58. Radio to guitaramp conversion hum problem
  59. Pioneer SX-348 - Service manual?
  60. Tube PS for mic preamp Help
  61. Add rectifier tube to yaqin mc10l? What size is best?
  62. global negative feedback schematic
  63. Signal transformer question
  64. What speaker system for tube amplifier
  65. 39/44 Tube
  66. tube-aholics anonymous ?
  67. 12AX7 heaters from 9VAC transformer
  68. Cant stop Aikido Humming
  69. Suggestions for rotary switches
  70. Question about potential transformer placement in K-12 Kit
  71. Extra pins on replacement potentiometer for K-12 tube kit?
  72. Instrument tube / valve preamp
  73. SRPP - issues understanding how to increase current
  74. ARC Power source+Marantz 7C(PCB edition)
  75. Repair and adjustment tips
  76. trimax output transformer TA2444
  77. anyone recognize this valve?
  78. Microphone Preamp design
  79. 6CM5 hi-fi amplifier
  80. Building an amp try #2
  81. Can the 6S33S/6C33C be mounted horizontally?
  82. A heptode question
  83. Looking for a 807 amp with 4 pairs of 807's
  84. pp output transformer miniblok2
  85. John Swenson's BDT preamp - finally!!
  86. Voice of Music console 816
  87. Steve Bench 1 tube reg in all glass
  88. Conn Caprice 427 needs new 12AU7 tubes—advice?
  89. Position of Iron in Can of HK Citation II Output Transformers
  90. Bottle size,does it matter in matched quads?
  91. Heater Pots?
  92. Current calculation from datasheet
  93. Any one ever seen this amp?
  94. Guiguang 300B for 300Beast.....
  95. FLEA PPP, all ecc99
  96. Well, it is time to start thinking about winter projects. GM70
  97. aghhh is my tube okay?
  98. Grid Bias provided by transformer secondary winding, what is this stuff about?
  99. Zener regulated supplies
  100. OPT fore drive ribbon speaker directly; why not ?
  101. van Dorn's Octode design - recommendations for a 10W/ch version
  102. Outrageous Speaker/Amplifier Idea
  103. Anyone ever made the EL84 P-P circuit referenced on the Tubecad Journal site?
  104. Scratchy volume pot on TAD DIY deluxe reverb
  105. Cathode Follower ideas please.....
  106. Anyone used the NTE1866 VU LED driver?
  107. Any potential problems when using a combo potentiometer / power switch on a K-12 kit?
  108. Help needed understanding component values.
  109. Separate passive pre and monoblocks?
  110. My new diy site
  111. Valves and musical instruments
  112. My DC Darling
  113. Question - add LED power indicator to Aikido pre
  114. Colorful amps
  115. Aikido Cathode Follower
  116. Converting a dirty channel to clean?
  117. A few questions about transformer placement in an S5 K-12 tube amplifer
  118. Bogen AP30 and new member
  119. Adding Clean channel to AX84 P1-Ex
  120. Echocord Super 62 Feedback at Low Levels?
  121. Direct Coupled 76/5687 linestage
  122. Be kind to your 5AR4 and input capacitor
  123. New Self-Powered ROHS compliant electronic device invented!
  124. Making my first hifi tube amp.
  125. Variation on Rodīs bias servo
  126. "No Light District" P-P amplifier
  127. What kind of tubes do i have?
  128. Understanding Scope Trace Square Wave
  129. Single tube SE with EML-20B
  130. LED bias cathodyne
  131. Diagnosing hum???
  132. Posted tube microphone preamp design
  133. Finally put the Aikido in a proper chassis
  134. Tube Preamp / Headphone amp question...
  135. Phono Preamp
  136. Initial 'DQ5' testing
  137. Free Tube Amplifier Schematic Diagrams
  138. Testing with DMM
  139. The Impressive Vetruvio GM70 SET amp.
  140. Fender Twin Reverb channel 2 has no output
  141. 6sn7 subminature??
  142. One channel louder than other
  143. How to use RCP 802A tube tester test B9A tubes?
  144. phono amp question - adding input tx
  145. Ebay "clones" PCB
  146. Phase splitter and balance input
  147. At Last....First Build Complete...6V6/6SL7
  148. Amplifier input
  149. The Tube Maze
  150. Variable Harmonizer
  151. Vetruvio Audio; new competition for the Chinese?
  152. Transmitting tube-driven transmitting tube SET amp?
  153. Circlotron questions
  154. Home Grown tube amps
  155. LT108 Oscillation sounds like tube rush/white noise
  156. Cool looking tubes anyone...
  157. st70 standby switch/cathode stripping SS rect
  158. BoM for an RH84 mono build?
  159. Signal hum ideas please.
  160. E88CC turbo
  161. SRPP vs. plate loaded, musicality and details
  162. 300B/EL156 Amp
  163. Just new one .all new layout.
  164. Am I correct????
  165. Need help identifying this amp...
  166. The Maggie factor
  167. Help wiring up anLED Bar
  168. E810F/7788 Pinout name/number?
  169. Need some help with a mercury 1200 tube checker
  170. Adjust cathode bias pot - both channels move together. Why?
  171. Building a 45 SET
  172. Stereo Pententometer Questions
  173. Looking for oscilloscope recommendations.
  174. dm160 magic eye help
  175. Tube stage for acoustic guitar?
  176. Zener heater regulator
  177. Dead Time - Correcting for it
  178. ARC Power source+ 12AX7&12AU7 Pre-amplifier
  179. PTC Thermistor for auto fixed bias
  180. How do I calculate output power?
  181. Microcontrollers in tube amps
  182. Dynaco PAT4/Aikido tube preamp
  183. RCA red base 5691 / 5692
  184. Updating my amps....and "hello" :-)
  185. my first attempt
  186. Finished my first PP amp, 6SJ7-6SN7-6v6
  187. Triode PP OP stage combining Blumlein Garter and CCS bias - anyone tried this?
  188. 6U8 Revisited
  189. DePalma redux
  190. Could this be a perfectly linear triode?
  191. Grounding elevated ccs series filament supply
  192. What to do with E182CC's
  193. Angela EL34 opinions please
  194. Chinise 6N1 tube replacement
  195. Ridiculous Hallucinations
  196. Transformer Ratings
  197. dB Meter with tube circuit
  198. Suggestions for pp or se monos
  199. Low filament current tubes
  200. Tube Clearout
  201. First tube amp, it needs maintenance
  202. Need EF86 phono preamplifier shematic
  203. cannot locate documentation on SCA 9190 receiver
  204. Ecc88 pin 9 connection??
  205. VTL Compact100 Monoblock Blows Fuse
  206. 300b driver revisited.
  207. SYclotron schematic
  208. Hum problem
  209. Suppo el34
  210. my new tube experience
  211. LL1682PP Lundahl
  212. BP Ultrapath
  213. Tube shops/sellers in Kiev , Ukraine ?
  214. Headphones with tubes...
  215. A Triad xfmr for a voltage doubler PSU
  216. Ra-100
  217. Series Resistors on Outputs of Transformer?
  218. what's up !? new choke=subsonic pumping
  219. How to get the best out of the 6C33C-B?
  220. TO-220 PCB spacing for HV MOSFETs
  221. Deluxe Reverb Clone too "throaty"
  222. Using a Dynaco ST-70 audio transformer for a guitar amp
  223. Need input on Buffer stage to use in Preamp..
  224. quad output tube help
  225. "Stacking" power transformer secondaries?
  226. Tubes flare on start up!!
  227. Solid state rectifier for AC30 clone
  228. Grid Stopper Advice - Graphs Included!
  229. Western Electric settings for Hickok 600A?
  230. Wanted! single-ended 807 schematic
  231. sputtering 5u4 on diy Wheatfield amp
  232. Is this output transformer faulty?
  233. Help identify variac
  234. Schematic for TL Audio VP-5051 Voice Processor
  235. what's a good layout for a quad EL84 amp on this box?
  236. Scott 350B Tuner; Bridge Rectifier
  237. intermitent static pops from speakers st70
  238. baxandall type tone control for diff amp
  239. Stage amps using DHTs
  240. Tube+OP My headphono & preamp
  241. NFB Clarification
  242. James output transformers
  243. I just bought a an old valve amp
  244. Bias Curves
  245. Triode in Class B or Beam Pentode in Class AB2
  246. Elna Cerafine Caps
  247. help with calibrating a Tv7d/U military tube tester
  248. Cathode Follower driven Phase Inverters
  249. Help finding a tube tester for Stereo tube amps.
  250. Anything horribly wrong with this (LTP w/ LM317 as CCS)

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