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

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