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  1. Bell Sound Systems Pacemaker Model 2220
  2. Any thoughts on this transformer on eBay?
  3. Need some help figuring out a Wurlitzer 6240.
  4. Bypassing cathode resistor on pp power tube
  5. Is it safe to use a 8BQ5 in place of a 6BQ5 in a guitar amp?
  6. TRIODE Voltage amp + Power OP output follower
  7. Cats and tube-a-holics
  8. Replace Tube Rectifier With Weber CC?
  9. 717a 2 stage SE amplifier
  10. Thoughts on Oatley K282 Valve Preamp?
  11. SS rectifier for SimpleSE and others...
  12. Need match Pr KT-88
  13. EL34 PP - again !!!
  14. S5 K-12 Kit sounds excellent with iPod, but relatively low volume with turntable?
  15. Finished K-12 Kit with cedar / brass chassis (pics)
  16. Groove Tube Dual 75 schematics
  17. Tubes HOT!
  18. Meng volume pot problem
  19. Use P-P OPT for SE?
  20. Safety ?
  21. Film caps always better than lytics?
  22. Valve Preamp for voice / guitar purpose
  23. 851 set?
  24. dual cathode follower problem
  25. Question about connecting grounds
  26. Is it okay for capacitors to be close to the main power transformer in S5 K-12 Kit?
  27. Fisher 500C Schematic
  28. looking for PP 6l6 schematic
  29. Muiscal Paradise MP-301 6V6 amp.
  30. First Build - PS Voltage Question?
  31. Need help about an hybrid amp circuit
  32. Radio to guitaramp conversion hum problem
  33. Pioneer SX-348 - Service manual?
  34. Tube PS for mic preamp Help
  35. Add rectifier tube to yaqin mc10l? What size is best?
  36. global negative feedback schematic
  37. Signal transformer question
  38. What speaker system for tube amplifier
  39. 39/44 Tube
  40. tube-aholics anonymous ?
  41. 12AX7 heaters from 9VAC transformer
  42. Cant stop Aikido Humming
  43. Suggestions for rotary switches
  44. Question about potential transformer placement in K-12 Kit
  45. Extra pins on replacement potentiometer for K-12 tube kit?
  46. Instrument tube / valve preamp
  47. SRPP - issues understanding how to increase current
  48. ARC Power source+Marantz 7C(PCB edition)
  49. Repair and adjustment tips
  50. trimax output transformer TA2444
  51. anyone recognize this valve?
  52. Microphone Preamp design
  53. 6CM5 hi-fi amplifier
  54. Building an amp try #2
  55. Can the 6S33S/6C33C be mounted horizontally?
  56. A heptode question
  57. Looking for a 807 amp with 4 pairs of 807's
  58. pp output transformer miniblok2
  59. John Swenson's BDT preamp - finally!!
  60. Voice of Music console 816
  61. Steve Bench 1 tube reg in all glass
  62. Conn Caprice 427 needs new 12AU7 tubes—advice?
  63. Position of Iron in Can of HK Citation II Output Transformers
  64. Bottle size,does it matter in matched quads?
  65. Heater Pots?
  66. Current calculation from datasheet
  67. Any one ever seen this amp?
  68. Guiguang 300B for 300Beast.....
  69. FLEA PPP, all ecc99
  70. Well, it is time to start thinking about winter projects. GM70
  71. aghhh is my tube okay?
  72. Grid Bias provided by transformer secondary winding, what is this stuff about?
  73. Zener regulated supplies
  74. OPT fore drive ribbon speaker directly; why not ?
  75. van Dorn's Octode design - recommendations for a 10W/ch version
  76. Outrageous Speaker/Amplifier Idea
  77. Anyone ever made the EL84 P-P circuit referenced on the Tubecad Journal site?
  78. Scratchy volume pot on TAD DIY deluxe reverb
  79. Cathode Follower ideas please.....
  80. Anyone used the NTE1866 VU LED driver?
  81. Any potential problems when using a combo potentiometer / power switch on a K-12 kit?
  82. Help needed understanding component values.
  83. Separate passive pre and monoblocks?
  84. My new diy site
  85. Valves and musical instruments
  86. My DC Darling
  87. Question - add LED power indicator to Aikido pre
  88. Colorful amps
  89. Aikido Cathode Follower
  90. Converting a dirty channel to clean?
  91. A few questions about transformer placement in an S5 K-12 tube amplifer
  92. Bogen AP30 and new member
  93. Adding Clean channel to AX84 P1-Ex
  94. Echocord Super 62 Feedback at Low Levels?
  95. Direct Coupled 76/5687 linestage
  96. Be kind to your 5AR4 and input capacitor
  97. New Self-Powered ROHS compliant electronic device invented!
  98. Making my first hifi tube amp.
  99. Variation on Rodīs bias servo
  100. "No Light District" P-P amplifier
  101. What kind of tubes do i have?
  102. Understanding Scope Trace Square Wave
  103. Single tube SE with EML-20B
  104. LED bias cathodyne
  105. Diagnosing hum???
  106. Posted tube microphone preamp design
  107. Finally put the Aikido in a proper chassis
  108. Tube Preamp / Headphone amp question...
  109. Phono Preamp
  110. Initial 'DQ5' testing
  111. Free Tube Amplifier Schematic Diagrams
  112. Testing with DMM
  113. The Impressive Vetruvio GM70 SET amp.
  114. Fender Twin Reverb channel 2 has no output
  115. 6sn7 subminature??
  116. One channel louder than other
  117. How to use RCP 802A tube tester test B9A tubes?
  118. phono amp question - adding input tx
  119. Ebay "clones" PCB
  120. Phase splitter and balance input
  121. At Last....First Build Complete...6V6/6SL7
  122. Amplifier input
  123. The Tube Maze
  124. Variable Harmonizer
  125. Vetruvio Audio; new competition for the Chinese?
  126. Transmitting tube-driven transmitting tube SET amp?
  127. Circlotron questions
  128. Home Grown tube amps
  129. LT108 Oscillation sounds like tube rush/white noise
  130. Cool looking tubes anyone...
  131. st70 standby switch/cathode stripping SS rect
  132. BoM for an RH84 mono build?
  133. Signal hum ideas please.
  134. E88CC turbo
  135. SRPP vs. plate loaded, musicality and details
  136. 300B/EL156 Amp
  137. Just new one .all new layout.
  138. Am I correct????
  139. Need help identifying this amp...
  140. The Maggie factor
  141. Help wiring up anLED Bar
  142. E810F/7788 Pinout name/number?
  143. Need some help with a mercury 1200 tube checker
  144. Adjust cathode bias pot - both channels move together. Why?
  145. Building a 45 SET
  146. Stereo Pententometer Questions
  147. Looking for oscilloscope recommendations.
  148. dm160 magic eye help
  149. Tube stage for acoustic guitar?
  150. Zener heater regulator
  151. Dead Time - Correcting for it
  152. ARC Power source+ 12AX7&12AU7 Pre-amplifier
  153. PTC Thermistor for auto fixed bias
  154. How do I calculate output power?
  155. Microcontrollers in tube amps
  156. Dynaco PAT4/Aikido tube preamp
  157. RCA red base 5691 / 5692
  158. Updating my amps....and "hello" :-)
  159. my first attempt
  160. Finished my first PP amp, 6SJ7-6SN7-6v6
  161. Triode PP OP stage combining Blumlein Garter and CCS bias - anyone tried this?
  162. 6U8 Revisited
  163. DePalma redux
  164. Could this be a perfectly linear triode?
  165. Grounding elevated ccs series filament supply
  166. What to do with E182CC's
  167. Angela EL34 opinions please
  168. Chinise 6N1 tube replacement
  169. Ridiculous Hallucinations
  170. Transformer Ratings
  171. dB Meter with tube circuit
  172. Suggestions for pp or se monos
  173. Low filament current tubes
  174. Tube Clearout
  175. First tube amp, it needs maintenance
  176. Need EF86 phono preamplifier shematic
  177. cannot locate documentation on SCA 9190 receiver
  178. Ecc88 pin 9 connection??
  179. VTL Compact100 Monoblock Blows Fuse
  180. 300b driver revisited.
  181. SYclotron schematic
  182. Hum problem
  183. Suppo el34
  184. my new tube experience
  185. LL1682PP Lundahl
  186. BP Ultrapath
  187. Tube shops/sellers in Kiev , Ukraine ?
  188. Headphones with tubes...
  189. A Triad xfmr for a voltage doubler PSU
  190. Ra-100
  191. Series Resistors on Outputs of Transformer?
  192. what's up !? new choke=subsonic pumping
  193. How to get the best out of the 6C33C-B?
  194. TO-220 PCB spacing for HV MOSFETs
  195. Deluxe Reverb Clone too "throaty"
  196. Using a Dynaco ST-70 audio transformer for a guitar amp
  197. Need input on Buffer stage to use in Preamp..
  198. quad output tube help
  199. "Stacking" power transformer secondaries?
  200. Tubes flare on start up!!
  201. Solid state rectifier for AC30 clone
  202. Grid Stopper Advice - Graphs Included!
  203. Western Electric settings for Hickok 600A?
  204. Wanted! single-ended 807 schematic
  205. sputtering 5u4 on diy Wheatfield amp
  206. Is this output transformer faulty?
  207. Help identify variac
  208. Schematic for TL Audio VP-5051 Voice Processor
  209. what's a good layout for a quad EL84 amp on this box?
  210. Scott 350B Tuner; Bridge Rectifier
  211. intermitent static pops from speakers st70
  212. baxandall type tone control for diff amp
  213. Stage amps using DHTs
  214. Tube+OP My headphono & preamp
  215. NFB Clarification
  216. James output transformers
  217. I just bought a an old valve amp
  218. Bias Curves
  219. Triode in Class B or Beam Pentode in Class AB2
  220. Elna Cerafine Caps
  221. help with calibrating a Tv7d/U military tube tester
  222. Cathode Follower driven Phase Inverters
  223. Help finding a tube tester for Stereo tube amps.
  224. Anything horribly wrong with this (LTP w/ LM317 as CCS)
  225. Zenith OPT question
  226. OT/Speaker impedance mismatch
  227. Goldilocks & the 3 (or more) preamp power supplies
  228. Using SE OT for PP.
  229. Need preamplifier schematic/suggestions
  230. Push-Pull vs Push-Pull-Parallel
  231. Odd/Crazy output transformer design?
  232. what 2A3 desgin recommented for home theater
  233. power supply for 10m45s
  234. How badly matched are your IXYS10M45S ?
  235. Class B Push-Pull
  236. Please comment on my design -and a few resistor values..
  237. How to lower even harmonic, keep odd one
  238. PC Mount 9-Pin Tube Socket Layout
  239. datasheet for type 52, help !!!
  240. Another kt88 Monoblock Builders Thread
  241. Question about stacked pawer supplies
  242. ys audio preamp
  243. Need help on 811A partial feedback
  244. Funny console, need ideas...
  245. SMPS experts come on in please!
  246. DC Filament supply boards
  247. Looking for vintage radio sound
  248. Channel death - Chinese EL34 PP
  249. JFET cascoded with tube gain calculation
  250. Fet 6Gk5 ECC88 mc phono stage

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