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  1. Heathkit Oscilloscope O-12
  2. Filament Autobias
  3. Shelby NC Ham Fest
  4. 2A3 Spud
  5. Resistor as a load
  6. How to balance pushp pull DHT finals
  7. 240v to 220v
  8. Hammond 272 FX plate voltage
  9. Drawing Load Line for Parallel Output Tube
  10. question about swapping el34 for kt77 in my tube amp
  11. 6 volt recifier tubes
  12. PSU Capacitor Selection
  13. Output transformer sizing...again...
  14. Power supply cabling
  15. Voltage doubler using PSUII?
  16. Rectifier Tubes in SE Amps
  17. 6v6 SEP
  18. 1967 Pioneer SX-34, 11W, WORTH FIXING???
  19. Jumper Wire Gauge and Material for Phono Preamp?
  20. Tube libraries for AutoTRAX wanted.
  21. DIY Layout Creator for Chassis Designs
  22. ecc99 - 6C19n PP, (6S19P)
  23. Dr Z Carmen Ghia build from a Hammond Reverb amp!!
  24. Strange HF distortion
  25. have a pair of 5k:8 OPTs lying around.. suggest me something to build?
  26. Marshall 1959 (Super Tremolo) repair help
  27. Early history of High Fidelity amplifiers
  28. Which pentode for input?
  29. 6n6p or 6P14P-ev for driver
  30. Old tranny - confused with windings
  31. Dynaco A-430 Vintage Output Transformers
  32. Output tube for 800 Ohm speaker?
  33. Today was the anual Tree Street Yard Sale event
  34. Florida ? what did I get ?
  35. 26HU5's vs 26DQ5's
  36. VoltCraft AT-400?
  37. Sonic differences: 45, 2A3, 300B, 845, 211
  38. Need help wiring a pot for cathode adjustment
  39. Sound of the 6SN7?
  40. A mystery device
  41. Plate curves... Ic2 & Ib?
  42. How to choke load for big voltage swings?
  43. 6550 SE design, please comment.
  44. "Impedance" of the output transformer
  45. Triode-wired small signal pentode question
  46. Calculating output impedance
  47. 6JM6 Infomation for Pete Millett's DCPP Amp
  48. Tube labeld ETBB
  49. Heaters wiring help!
  50. What do you guys think of this IR volume control?
  51. Can you send me the Aikido 5687 user manual
  52. Cathode Follower output cap
  53. EL84 rebuild suggestions
  54. voltage divider in WE91 driver
  55. Power Tx Myth?
  56. voltage multiplier based on SS trafo - LONG
  57. What tube for QUIET phono pre??
  58. A&R 8ohm 4008 output transformer
  59. How does DRD Ultrapath Work?
  60. Russian 6H2p-E??
  61. Started work on my stereo 7027a PSE amp
  62. Mono Tube Comp for analog kick drum
  63. Line stage preamplifier
  64. Trying to select the Aikido components
  65. X-PRE musical fidelity preamp. need help modifying
  66. 6C33C & Borbely Question
  67. 12BH7A in common cathode
  68. Sneak Preview: 9 Band Active All Tube EQ
  69. Bought a set of Greenlee conduit punches for my latest project - WOW!
  70. "Universal" octal amplifier?
  71. MU follower - distortion
  72. lighting transformers 12V
  73. Chinese 6N3 preamp questions
  74. Why are Chinese preamp knockoffs so popular?
  75. 4K7 OPT suitable for 6550/KT88?
  76. Transformer question - 110 v and 25 v from 1 secondary?
  77. About loadline again, how to choose load and current
  78. Parallel Output Transformers
  79. 6SN7 / 6V6 power amp : very odd behavour
  80. HV mA Spec on Large RCA Power Xfmr?
  81. Is the Aikido too 'bright'?
  82. Has anyone put the Glassware phono & line amps in same box?
  83. High impedance balanced output: how long the cable?
  84. Data Sheets
  85. Can I use a LM317 bias on lower cathode of SRPP?
  86. AU-34 Output transformer replacement question
  87. The new KT120 from tungsol
  88. em83 questions
  89. Push-pull PCL84 schematic and a question
  90. confused on power transformer ratings
  91. C3g:GM70:GM70 schematic advice
  92. Can someone explain Load Lines?
  93. Humming from WCF but not SRPP
  94. Gas regulator tubes
  95. My B&K 707 sensitivity seems wonky
  96. Lowrey LC1 B schematic wanted
  97. Complete tube amp novice got a few questions!!
  98. jacked up the bias...WOW!
  99. Looking for PP 7027a shematic
  100. So, if it's not DIY Gene, then what?
  101. What driver tube for 200Vrms?
  102. Tube socket purchase
  103. Something I found interesting a while ago!
  104. Eico HF-22 Circuit
  105. SEDHT amp - decisions decisions
  106. Confused with designing
  107. Digitally controlled analog attenuator
  108. Purchased my 1st valve amp and can only get one channel working, please help!
  109. Another silly tube yesting question
  110. potentially very stupid questions....
  111. Tube rectifier: AZ1, AZ31, AZ50 vs 5u4
  112. Tube Square-Law, what and how to set up?
  113. Need help finding schematic. Conn 720
  114. OPT for parafeed SE
  115. Anyone else tried an opamp as a driver?
  116. e180f/6688 pentode operting points
  117. power supply reassignment problem
  118. Mains power transformer on S5 K-12 kit hums?
  119. Oriole OPT
  120. 26DQ5's vs 26HU5's vs 6KN6's and transformers
  121. SRPP power using power tranny as OPT?
  122. Need guidance with heathkit SA-2 refurbish/mods
  123. B+ discharge times!
  124. 26HU5's....and a confession
  125. Bell Sound Systems Pacemaker Model 2220
  126. Any thoughts on this transformer on eBay?
  127. Need some help figuring out a Wurlitzer 6240.
  128. Bypassing cathode resistor on pp power tube
  129. Is it safe to use a 8BQ5 in place of a 6BQ5 in a guitar amp?
  130. TRIODE Voltage amp + Power OP output follower
  131. Cats and tube-a-holics
  132. Replace Tube Rectifier With Weber CC?
  133. 717a 2 stage SE amplifier
  134. Thoughts on Oatley K282 Valve Preamp?
  135. SS rectifier for SimpleSE and others...
  136. Need match Pr KT-88
  137. EL34 PP - again !!!
  138. S5 K-12 Kit sounds excellent with iPod, but relatively low volume with turntable?
  139. Finished K-12 Kit with cedar / brass chassis (pics)
  140. Groove Tube Dual 75 schematics
  141. Tubes HOT!
  142. Meng volume pot problem
  143. Use P-P OPT for SE?
  144. Safety ?
  145. Film caps always better than lytics?
  146. Valve Preamp for voice / guitar purpose
  147. 851 set?
  148. dual cathode follower problem
  149. Question about connecting grounds
  150. Is it okay for capacitors to be close to the main power transformer in S5 K-12 Kit?
  151. Fisher 500C Schematic
  152. looking for PP 6l6 schematic
  153. Muiscal Paradise MP-301 6V6 amp.
  154. First Build - PS Voltage Question?
  155. Need help about an hybrid amp circuit
  156. Radio to guitaramp conversion hum problem
  157. Pioneer SX-348 - Service manual?
  158. Tube PS for mic preamp Help
  159. Add rectifier tube to yaqin mc10l? What size is best?
  160. global negative feedback schematic
  161. Signal transformer question
  162. What speaker system for tube amplifier
  163. 39/44 Tube
  164. tube-aholics anonymous ?
  165. 12AX7 heaters from 9VAC transformer
  166. Cant stop Aikido Humming
  167. Suggestions for rotary switches
  168. Question about potential transformer placement in K-12 Kit
  169. Extra pins on replacement potentiometer for K-12 tube kit?
  170. Instrument tube / valve preamp
  171. SRPP - issues understanding how to increase current
  172. ARC Power source+Marantz 7C(PCB edition)
  173. Repair and adjustment tips
  174. trimax output transformer TA2444
  175. anyone recognize this valve?
  176. Microphone Preamp design
  177. 6CM5 hi-fi amplifier
  178. Building an amp try #2
  179. Can the 6S33S/6C33C be mounted horizontally?
  180. A heptode question
  181. Looking for a 807 amp with 4 pairs of 807's
  182. pp output transformer miniblok2
  183. John Swenson's BDT preamp - finally!!
  184. Voice of Music console 816
  185. Steve Bench 1 tube reg in all glass
  186. Conn Caprice 427 needs new 12AU7 tubes—advice?
  187. Position of Iron in Can of HK Citation II Output Transformers
  188. Bottle size,does it matter in matched quads?
  189. Heater Pots?
  190. Current calculation from datasheet
  191. Any one ever seen this amp?
  192. Guiguang 300B for 300Beast.....
  193. FLEA PPP, all ecc99
  194. Well, it is time to start thinking about winter projects. GM70
  195. aghhh is my tube okay?
  196. Grid Bias provided by transformer secondary winding, what is this stuff about?
  197. Zener regulated supplies
  198. OPT fore drive ribbon speaker directly; why not ?
  199. van Dorn's Octode design - recommendations for a 10W/ch version
  200. Outrageous Speaker/Amplifier Idea
  201. Anyone ever made the EL84 P-P circuit referenced on the Tubecad Journal site?
  202. Scratchy volume pot on TAD DIY deluxe reverb
  203. Cathode Follower ideas please.....
  204. Anyone used the NTE1866 VU LED driver?
  205. Any potential problems when using a combo potentiometer / power switch on a K-12 kit?
  206. Help needed understanding component values.
  207. Separate passive pre and monoblocks?
  208. My new diy site
  209. Valves and musical instruments
  210. My DC Darling
  211. Question - add LED power indicator to Aikido pre
  212. Colorful amps
  213. Aikido Cathode Follower
  214. Converting a dirty channel to clean?
  215. A few questions about transformer placement in an S5 K-12 tube amplifer
  216. Bogen AP30 and new member
  217. Adding Clean channel to AX84 P1-Ex
  218. Echocord Super 62 Feedback at Low Levels?
  219. Direct Coupled 76/5687 linestage
  220. Be kind to your 5AR4 and input capacitor
  221. New Self-Powered ROHS compliant electronic device invented!
  222. Making my first hifi tube amp.
  223. Variation on Rodīs bias servo
  224. "No Light District" P-P amplifier
  225. What kind of tubes do i have?
  226. Understanding Scope Trace Square Wave
  227. Single tube SE with EML-20B
  228. LED bias cathodyne
  229. Diagnosing hum???
  230. Posted tube microphone preamp design
  231. Finally put the Aikido in a proper chassis
  232. Tube Preamp / Headphone amp question...
  233. Phono Preamp
  234. Initial 'DQ5' testing
  235. Free Tube Amplifier Schematic Diagrams
  236. Testing with DMM
  237. The Impressive Vetruvio GM70 SET amp.
  238. Fender Twin Reverb channel 2 has no output
  239. 6sn7 subminature??
  240. One channel louder than other
  241. How to use RCP 802A tube tester test B9A tubes?
  242. phono amp question - adding input tx
  243. Ebay "clones" PCB
  244. Phase splitter and balance input
  245. At Last....First Build Complete...6V6/6SL7
  246. Amplifier input
  247. The Tube Maze
  248. Variable Harmonizer
  249. Vetruvio Audio; new competition for the Chinese?
  250. Transmitting tube-driven transmitting tube SET amp?

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