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  1. 4K7 OPT suitable for 6550/KT88?
  2. Transformer question - 110 v and 25 v from 1 secondary?
  3. About loadline again, how to choose load and current
  4. Parallel Output Transformers
  5. 6SN7 / 6V6 power amp : very odd behavour
  6. HV mA Spec on Large RCA Power Xfmr?
  7. Is the Aikido too 'bright'?
  8. Has anyone put the Glassware phono & line amps in same box?
  9. High impedance balanced output: how long the cable?
  10. Data Sheets
  11. Can I use a LM317 bias on lower cathode of SRPP?
  12. AU-34 Output transformer replacement question
  13. The new KT120 from tungsol
  14. em83 questions
  15. Push-pull PCL84 schematic and a question
  16. confused on power transformer ratings
  17. C3g:GM70:GM70 schematic advice
  18. Can someone explain Load Lines?
  19. Humming from WCF but not SRPP
  20. Gas regulator tubes
  21. My B&K 707 sensitivity seems wonky
  22. Lowrey LC1 B schematic wanted
  23. Complete tube amp novice got a few questions!!
  24. jacked up the bias...WOW!
  25. Looking for PP 7027a shematic
  26. So, if it's not DIY Gene, then what?
  27. What driver tube for 200Vrms?
  28. Tube socket purchase
  29. Something I found interesting a while ago!
  30. Eico HF-22 Circuit
  31. SEDHT amp - decisions decisions
  32. Confused with designing
  33. Digitally controlled analog attenuator
  34. Purchased my 1st valve amp and can only get one channel working, please help!
  35. Another silly tube yesting question
  36. potentially very stupid questions....
  37. Tube rectifier: AZ1, AZ31, AZ50 vs 5u4
  38. Tube Square-Law, what and how to set up?
  39. Need help finding schematic. Conn 720
  40. OPT for parafeed SE
  41. Anyone else tried an opamp as a driver?
  42. e180f/6688 pentode operting points
  43. power supply reassignment problem
  44. Mains power transformer on S5 K-12 kit hums?
  45. Oriole OPT
  46. 26DQ5's vs 26HU5's vs 6KN6's and transformers
  47. SRPP power using power tranny as OPT?
  48. Need guidance with heathkit SA-2 refurbish/mods
  49. B+ discharge times!
  50. 26HU5's....and a confession
  51. Bell Sound Systems Pacemaker Model 2220
  52. Any thoughts on this transformer on eBay?
  53. Need some help figuring out a Wurlitzer 6240.
  54. Bypassing cathode resistor on pp power tube
  55. Is it safe to use a 8BQ5 in place of a 6BQ5 in a guitar amp?
  56. TRIODE Voltage amp + Power OP output follower
  57. Cats and tube-a-holics
  58. Replace Tube Rectifier With Weber CC?
  59. 717a 2 stage SE amplifier
  60. Thoughts on Oatley K282 Valve Preamp?
  61. SS rectifier for SimpleSE and others...
  62. Need match Pr KT-88
  63. EL34 PP - again !!!
  64. S5 K-12 Kit sounds excellent with iPod, but relatively low volume with turntable?
  65. Finished K-12 Kit with cedar / brass chassis (pics)
  66. Groove Tube Dual 75 schematics
  67. Tubes HOT!
  68. Meng volume pot problem
  69. Use P-P OPT for SE?
  70. Safety ?
  71. Film caps always better than lytics?
  72. Valve Preamp for voice / guitar purpose
  73. 851 set?
  74. dual cathode follower problem
  75. Question about connecting grounds
  76. Is it okay for capacitors to be close to the main power transformer in S5 K-12 Kit?
  77. Fisher 500C Schematic
  78. looking for PP 6l6 schematic
  79. Muiscal Paradise MP-301 6V6 amp.
  80. First Build - PS Voltage Question?
  81. Need help about an hybrid amp circuit
  82. Radio to guitaramp conversion hum problem
  83. Pioneer SX-348 - Service manual?
  84. Tube PS for mic preamp Help
  85. Add rectifier tube to yaqin mc10l? What size is best?
  86. global negative feedback schematic
  87. Signal transformer question
  88. What speaker system for tube amplifier
  89. 39/44 Tube
  90. tube-aholics anonymous ?
  91. 12AX7 heaters from 9VAC transformer
  92. Cant stop Aikido Humming
  93. Suggestions for rotary switches
  94. Question about potential transformer placement in K-12 Kit
  95. Extra pins on replacement potentiometer for K-12 tube kit?
  96. Instrument tube / valve preamp
  97. SRPP - issues understanding how to increase current
  98. ARC Power source+Marantz 7C(PCB edition)
  99. Repair and adjustment tips
  100. trimax output transformer TA2444
  101. anyone recognize this valve?
  102. Microphone Preamp design
  103. 6CM5 hi-fi amplifier
  104. Building an amp try #2
  105. Can the 6S33S/6C33C be mounted horizontally?
  106. A heptode question
  107. Looking for a 807 amp with 4 pairs of 807's
  108. pp output transformer miniblok2
  109. John Swenson's BDT preamp - finally!!
  110. Voice of Music console 816
  111. Steve Bench 1 tube reg in all glass
  112. Conn Caprice 427 needs new 12AU7 tubes—advice?
  113. Position of Iron in Can of HK Citation II Output Transformers
  114. Bottle size,does it matter in matched quads?
  115. Heater Pots?
  116. Current calculation from datasheet
  117. Any one ever seen this amp?
  118. Guiguang 300B for 300Beast.....
  119. FLEA PPP, all ecc99
  120. Well, it is time to start thinking about winter projects. GM70
  121. aghhh is my tube okay?
  122. Grid Bias provided by transformer secondary winding, what is this stuff about?
  123. Zener regulated supplies
  124. OPT fore drive ribbon speaker directly; why not ?
  125. van Dorn's Octode design - recommendations for a 10W/ch version
  126. Outrageous Speaker/Amplifier Idea
  127. Anyone ever made the EL84 P-P circuit referenced on the Tubecad Journal site?
  128. Scratchy volume pot on TAD DIY deluxe reverb
  129. Cathode Follower ideas please.....
  130. Anyone used the NTE1866 VU LED driver?
  131. Any potential problems when using a combo potentiometer / power switch on a K-12 kit?
  132. Help needed understanding component values.
  133. Separate passive pre and monoblocks?
  134. My new diy site
  135. Valves and musical instruments
  136. My DC Darling
  137. Question - add LED power indicator to Aikido pre
  138. Colorful amps
  139. Aikido Cathode Follower
  140. Converting a dirty channel to clean?
  141. A few questions about transformer placement in an S5 K-12 tube amplifer
  142. Bogen AP30 and new member
  143. Adding Clean channel to AX84 P1-Ex
  144. Echocord Super 62 Feedback at Low Levels?
  145. Direct Coupled 76/5687 linestage
  146. Be kind to your 5AR4 and input capacitor
  147. New Self-Powered ROHS compliant electronic device invented!
  148. Making my first hifi tube amp.
  149. Variation on Rodīs bias servo
  150. "No Light District" P-P amplifier
  151. What kind of tubes do i have?
  152. Understanding Scope Trace Square Wave
  153. Single tube SE with EML-20B
  154. LED bias cathodyne
  155. Diagnosing hum???
  156. Posted tube microphone preamp design
  157. Finally put the Aikido in a proper chassis
  158. Tube Preamp / Headphone amp question...
  159. Phono Preamp
  160. Initial 'DQ5' testing
  161. Free Tube Amplifier Schematic Diagrams
  162. Testing with DMM
  163. The Impressive Vetruvio GM70 SET amp.
  164. Fender Twin Reverb channel 2 has no output
  165. 6sn7 subminature??
  166. One channel louder than other
  167. How to use RCP 802A tube tester test B9A tubes?
  168. phono amp question - adding input tx
  169. Ebay "clones" PCB
  170. Phase splitter and balance input
  171. At Last....First Build Complete...6V6/6SL7
  172. Amplifier input
  173. The Tube Maze
  174. Variable Harmonizer
  175. Vetruvio Audio; new competition for the Chinese?
  176. Transmitting tube-driven transmitting tube SET amp?
  177. Circlotron questions
  178. Home Grown tube amps
  179. LT108 Oscillation sounds like tube rush/white noise
  180. Cool looking tubes anyone...
  181. st70 standby switch/cathode stripping SS rect
  182. BoM for an RH84 mono build?
  183. Signal hum ideas please.
  184. E88CC turbo
  185. SRPP vs. plate loaded, musicality and details
  186. 300B/EL156 Amp
  187. Just new one .all new layout.
  188. Am I correct????
  189. Need help identifying this amp...
  190. The Maggie factor
  191. Help wiring up anLED Bar
  192. E810F/7788 Pinout name/number?
  193. Need some help with a mercury 1200 tube checker
  194. Adjust cathode bias pot - both channels move together. Why?
  195. Building a 45 SET
  196. Stereo Pententometer Questions
  197. Looking for oscilloscope recommendations.
  198. dm160 magic eye help
  199. Zener heater regulator
  200. Dead Time - Correcting for it
  201. ARC Power source+ 12AX7&12AU7 Pre-amplifier
  202. PTC Thermistor for auto fixed bias
  203. How do I calculate output power?
  204. Microcontrollers in tube amps
  205. Dynaco PAT4/Aikido tube preamp
  206. RCA red base 5691 / 5692
  207. Updating my amps....and "hello" :-)
  208. my first attempt
  209. Finished my first PP amp, 6SJ7-6SN7-6v6
  210. Triode PP OP stage combining Blumlein Garter and CCS bias - anyone tried this?
  211. 6U8 Revisited
  212. DePalma redux
  213. Could this be a perfectly linear triode?
  214. Grounding elevated ccs series filament supply
  215. What to do with E182CC's
  216. Angela EL34 opinions please
  217. Chinise 6N1 tube replacement
  218. Ridiculous Hallucinations
  219. Transformer Ratings
  220. dB Meter with tube circuit
  221. Suggestions for pp or se monos
  222. Low filament current tubes
  223. Tube Clearout
  224. First tube amp, it needs maintenance
  225. Need EF86 phono preamplifier shematic
  226. cannot locate documentation on SCA 9190 receiver
  227. Ecc88 pin 9 connection??
  228. VTL Compact100 Monoblock Blows Fuse
  229. 300b driver revisited.
  230. SYclotron schematic
  231. Hum problem
  232. Suppo el34
  233. my new tube experience
  234. LL1682PP Lundahl
  235. BP Ultrapath
  236. Tube shops/sellers in Kiev , Ukraine ?
  237. Headphones with tubes...
  238. A Triad xfmr for a voltage doubler PSU
  239. Ra-100
  240. Series Resistors on Outputs of Transformer?
  241. what's up !? new choke=subsonic pumping
  242. How to get the best out of the 6C33C-B?
  243. TO-220 PCB spacing for HV MOSFETs
  244. Deluxe Reverb Clone too "throaty"
  245. Using a Dynaco ST-70 audio transformer for a guitar amp
  246. Need input on Buffer stage to use in Preamp..
  247. quad output tube help
  248. "Stacking" power transformer secondaries?
  249. Tubes flare on start up!!
  250. Solid state rectifier for AC30 clone

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