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  1. Cathode Follower output cap
  2. EL84 rebuild suggestions
  3. voltage divider in WE91 driver
  4. Power Tx Myth?
  5. voltage multiplier based on SS trafo - LONG
  6. What tube for QUIET phono pre??
  7. A&R 8ohm 4008 output transformer
  8. How does DRD Ultrapath Work?
  9. Russian 6H2p-E??
  10. Started work on my stereo 7027a PSE amp
  11. Mono Tube Comp for analog kick drum
  12. Line stage preamplifier
  13. Trying to select the Aikido components
  14. X-PRE musical fidelity preamp. need help modifying
  15. 6C33C & Borbely Question
  16. 12BH7A in common cathode
  17. Sneak Preview: 9 Band Active All Tube EQ
  18. Bought a set of Greenlee conduit punches for my latest project - WOW!
  19. "Universal" octal amplifier?
  20. MU follower - distortion
  21. lighting transformers 12V
  22. Chinese 6N3 preamp questions
  23. Why are Chinese preamp knockoffs so popular?
  24. 4K7 OPT suitable for 6550/KT88?
  25. Transformer question - 110 v and 25 v from 1 secondary?
  26. About loadline again, how to choose load and current
  27. Parallel Output Transformers
  28. 6SN7 / 6V6 power amp : very odd behavour
  29. HV mA Spec on Large RCA Power Xfmr?
  30. Is the Aikido too 'bright'?
  31. Has anyone put the Glassware phono & line amps in same box?
  32. High impedance balanced output: how long the cable?
  33. Data Sheets
  34. Can I use a LM317 bias on lower cathode of SRPP?
  35. AU-34 Output transformer replacement question
  36. The new KT120 from tungsol
  37. em83 questions
  38. Push-pull PCL84 schematic and a question
  39. confused on power transformer ratings
  40. C3g:GM70:GM70 schematic advice
  41. Can someone explain Load Lines?
  42. Humming from WCF but not SRPP
  43. Gas regulator tubes
  44. My B&K 707 sensitivity seems wonky
  45. Lowrey LC1 B schematic wanted
  46. Complete tube amp novice got a few questions!!
  47. jacked up the bias...WOW!
  48. Looking for PP 7027a shematic
  49. So, if it's not DIY Gene, then what?
  50. What driver tube for 200Vrms?
  51. Tube socket purchase
  52. Something I found interesting a while ago!
  53. Eico HF-22 Circuit
  54. SEDHT amp - decisions decisions
  55. Confused with designing
  56. Digitally controlled analog attenuator
  57. Purchased my 1st valve amp and can only get one channel working, please help!
  58. Another silly tube yesting question
  59. potentially very stupid questions....
  60. Tube rectifier: AZ1, AZ31, AZ50 vs 5u4
  61. Tube Square-Law, what and how to set up?
  62. Need help finding schematic. Conn 720
  63. OPT for parafeed SE
  64. Anyone else tried an opamp as a driver?
  65. e180f/6688 pentode operting points
  66. power supply reassignment problem
  67. Mains power transformer on S5 K-12 kit hums?
  68. Oriole OPT
  69. 26DQ5's vs 26HU5's vs 6KN6's and transformers
  70. SRPP power using power tranny as OPT?
  71. Need guidance with heathkit SA-2 refurbish/mods
  72. B+ discharge times!
  73. 26HU5's....and a confession
  74. Bell Sound Systems Pacemaker Model 2220
  75. Any thoughts on this transformer on eBay?
  76. Need some help figuring out a Wurlitzer 6240.
  77. Bypassing cathode resistor on pp power tube
  78. TRIODE Voltage amp + Power OP output follower
  79. Cats and tube-a-holics
  80. Replace Tube Rectifier With Weber CC?
  81. 717a 2 stage SE amplifier
  82. Thoughts on Oatley K282 Valve Preamp?
  83. SS rectifier for SimpleSE and others...
  84. Need match Pr KT-88
  85. EL34 PP - again !!!
  86. S5 K-12 Kit sounds excellent with iPod, but relatively low volume with turntable?
  87. Finished K-12 Kit with cedar / brass chassis (pics)
  88. Tubes HOT!
  89. Meng volume pot problem
  90. Use P-P OPT for SE?
  91. Safety ?
  92. Film caps always better than lytics?
  93. 851 set?
  94. dual cathode follower problem
  95. Question about connecting grounds
  96. Is it okay for capacitors to be close to the main power transformer in S5 K-12 Kit?
  97. Fisher 500C Schematic
  98. looking for PP 6l6 schematic
  99. Muiscal Paradise MP-301 6V6 amp.
  100. First Build - PS Voltage Question?
  101. Need help about an hybrid amp circuit
  102. Pioneer SX-348 - Service manual?
  103. Tube PS for mic preamp Help
  104. Add rectifier tube to yaqin mc10l? What size is best?
  105. global negative feedback schematic
  106. Signal transformer question
  107. What speaker system for tube amplifier
  108. 39/44 Tube
  109. tube-aholics anonymous ?
  110. 12AX7 heaters from 9VAC transformer
  111. Cant stop Aikido Humming
  112. Suggestions for rotary switches
  113. Question about potential transformer placement in K-12 Kit
  114. Extra pins on replacement potentiometer for K-12 tube kit?
  115. SRPP - issues understanding how to increase current
  116. ARC Power source+Marantz 7C(PCB edition)
  117. Repair and adjustment tips
  118. trimax output transformer TA2444
  119. anyone recognize this valve?
  120. Microphone Preamp design
  121. 6CM5 hi-fi amplifier
  122. Building an amp try #2
  123. Can the 6S33S/6C33C be mounted horizontally?
  124. A heptode question
  125. Looking for a 807 amp with 4 pairs of 807's
  126. pp output transformer miniblok2
  127. John Swenson's BDT preamp - finally!!
  128. Voice of Music console 816
  129. Steve Bench 1 tube reg in all glass
  130. Conn Caprice 427 needs new 12AU7 tubes—advice?
  131. Position of Iron in Can of HK Citation II Output Transformers
  132. Bottle size,does it matter in matched quads?
  133. Heater Pots?
  134. Current calculation from datasheet
  135. Any one ever seen this amp?
  136. Guiguang 300B for 300Beast.....
  137. FLEA PPP, all ecc99
  138. Well, it is time to start thinking about winter projects. GM70
  139. aghhh is my tube okay?
  140. Grid Bias provided by transformer secondary winding, what is this stuff about?
  141. Zener regulated supplies
  142. OPT fore drive ribbon speaker directly; why not ?
  143. van Dorn's Octode design - recommendations for a 10W/ch version
  144. Outrageous Speaker/Amplifier Idea
  145. Anyone ever made the EL84 P-P circuit referenced on the Tubecad Journal site?
  146. Cathode Follower ideas please.....
  147. Anyone used the NTE1866 VU LED driver?
  148. Any potential problems when using a combo potentiometer / power switch on a K-12 kit?
  149. Help needed understanding component values.
  150. Separate passive pre and monoblocks?
  151. My new diy site
  152. Valves and musical instruments
  153. My DC Darling
  154. Question - add LED power indicator to Aikido pre
  155. Colorful amps
  156. Aikido Cathode Follower
  157. Converting a dirty channel to clean?
  158. A few questions about transformer placement in an S5 K-12 tube amplifer
  159. Bogen AP30 and new member
  160. Echocord Super 62 Feedback at Low Levels?
  161. Direct Coupled 76/5687 linestage
  162. Be kind to your 5AR4 and input capacitor
  163. New Self-Powered ROHS compliant electronic device invented!
  164. Making my first hifi tube amp.
  165. Variation on Rodīs bias servo
  166. "No Light District" P-P amplifier
  167. What kind of tubes do i have?
  168. Understanding Scope Trace Square Wave
  169. Single tube SE with EML-20B
  170. LED bias cathodyne
  171. Diagnosing hum???
  172. Posted tube microphone preamp design
  173. Finally put the Aikido in a proper chassis
  174. Tube Preamp / Headphone amp question...
  175. Phono Preamp
  176. Initial 'DQ5' testing
  177. Free Tube Amplifier Schematic Diagrams
  178. Testing with DMM
  179. The Impressive Vetruvio GM70 SET amp.
  180. 6sn7 subminature??
  181. One channel louder than other
  182. How to use RCP 802A tube tester test B9A tubes?
  183. phono amp question - adding input tx
  184. Ebay "clones" PCB
  185. Phase splitter and balance input
  186. At Last....First Build Complete...6V6/6SL7
  187. Amplifier input
  188. The Tube Maze
  189. Variable Harmonizer
  190. Vetruvio Audio; new competition for the Chinese?
  191. Transmitting tube-driven transmitting tube SET amp?
  192. Circlotron questions
  193. Home Grown tube amps
  194. LT108 Oscillation sounds like tube rush/white noise
  195. Cool looking tubes anyone...
  196. st70 standby switch/cathode stripping SS rect
  197. BoM for an RH84 mono build?
  198. Signal hum ideas please.
  199. E88CC turbo
  200. SRPP vs. plate loaded, musicality and details
  201. 300B/EL156 Amp
  202. Just new one .all new layout.
  203. Am I correct????
  204. Need help identifying this amp...
  205. The Maggie factor
  206. Help wiring up anLED Bar
  207. E810F/7788 Pinout name/number?
  208. Need some help with a mercury 1200 tube checker
  209. Adjust cathode bias pot - both channels move together. Why?
  210. Building a 45 SET
  211. Stereo Pententometer Questions
  212. Looking for oscilloscope recommendations.
  213. dm160 magic eye help
  214. Zener heater regulator
  215. Dead Time - Correcting for it
  216. ARC Power source+ 12AX7&12AU7 Pre-amplifier
  217. PTC Thermistor for auto fixed bias
  218. How do I calculate output power?
  219. Microcontrollers in tube amps
  220. Dynaco PAT4/Aikido tube preamp
  221. RCA red base 5691 / 5692
  222. Updating my amps....and "hello" :-)
  223. my first attempt
  224. Finished my first PP amp, 6SJ7-6SN7-6v6
  225. Triode PP OP stage combining Blumlein Garter and CCS bias - anyone tried this?
  226. 6U8 Revisited
  227. DePalma redux
  228. Could this be a perfectly linear triode?
  229. Grounding elevated ccs series filament supply
  230. What to do with E182CC's
  231. Angela EL34 opinions please
  232. Chinise 6N1 tube replacement
  233. Ridiculous Hallucinations
  234. Transformer Ratings
  235. dB Meter with tube circuit
  236. Suggestions for pp or se monos
  237. Low filament current tubes
  238. Tube Clearout
  239. First tube amp, it needs maintenance
  240. Need EF86 phono preamplifier shematic
  241. cannot locate documentation on SCA 9190 receiver
  242. Ecc88 pin 9 connection??
  243. VTL Compact100 Monoblock Blows Fuse
  244. 300b driver revisited.
  245. SYclotron schematic
  246. Hum problem
  247. Suppo el34
  248. my new tube experience
  249. LL1682PP Lundahl
  250. BP Ultrapath

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