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  1. Old ceramic dogbone capacitor color codes
  2. Williamson preamp identification help wanted
  3. Adequate switch for UL-triode-pentode
  4. pl500 based integrated OTL amplifier
  5. Capacitor dielectric - high impedance headphones
  6. REQUEST FOR OPINIONS
  7. Mysterious LCR phono preamp
  8. Eimac 100TL Output Transformers and Bias Point ?
  9. Tube deterioration
  10. Heathkit XO-1 power cords
  11. EF86 Push-Pull "power"-amp
  12. Transformers!?
  13. Weird ground loop problem
  14. Re-caping Cayin A70-T
  15. A3 attenuator help for an Aikido line amp
  16. Driver Tube Power Supply Question ?
  17. Line Stage vs. Phase Inverter - 12A*7
  18. Intermittent Buzz Decware Zen SE84Bged
  19. Tamura F2011/el34 x 4
  20. E88CC/6922 battery supply
  21. Aikido 9-pin all-in-1 headphone amp problem
  22. Filament Transformer Question ?
  23. Load Resistance, etc., chart for Class A push pull 6L6s?
  24. Question about preamp, boost and line-stage
  25. help please
  26. Practical phase inverter article
  27. Tube vs. Jfet Preamp for Dynaco ST-35 tube power amp
  28. Rio W-41 no sound
  29. Help: TDA1541A DAC Output To Tube Gainstage
  30. Pieter's take on an all DHT headphone amplifier.
  31. toroidal chokes
  32. Truly Silly Transformer Question
  33. Elementary resistance question
  34. Russian 310A + 300B
  35. 1959 RCA tube amplifier needs help
  36. What's going on?
  37. Aikido 9-pin All-in-one Testing question
  38. Gyrator in Tail of LTP
  39. tubemaster EL84
  40. Silly transformer question
  41. Marant 8b bias meter
  42. ElectroTone OrganMate spring reverb - mod suggestions?
  43. Opera Consonance resitor question ?
  44. ADI's Double Dyna
  45. DuMont Stereo Tube Console late 50's - What to do?
  46. No Sound from Magnavox EL 1484-1 amp/phono
  47. Elevated Heater Question
  48. 6P45S/EL509 input capacitance in triode mode
  49. 6E6p-e Little Tiny Wire
  50. another aikido ?
  51. NOS 6P3S-e or cheap new 5881? Identify this tube..
  52. Contan Audio from Melbourne Aus, any info?
  53. Loctal Base Post
  54. Timber amp with solid copper plate as earth and ground plane
  55. Dynaco ST70 - Which tubes do you like?
  56. 6SL7 in parallel driving 6550
  57. Will this work as a heater for 300b?
  58. Tube grid resistance for 6P45S, fine?
  59. Akido help pls
  60. BEARD P101 information
  61. Got some 6n3c-e (6p3s-e)with blank bulb?
  62. Graaf GM-20
  63. medium power OTL circlotron amplifier
  64. Help me identity this amp
  65. Hajdinjak preamp + 2x mono tube amp -What to do?
  66. Moscode 600 Noisy Fan
  67. component reduction in signal chain
  68. Aikido with Stax
  69. 'High power' shunt regulator
  70. Help need on Xindak XA3200MII hybrid pre-amplifier
  71. ideas for tube burn in / bias match station
  72. KT120 triode operation single stage amp
  73. Question regarding 7199 Tube wiring
  74. Why do modern PP OPTs have 16 Ohm taps?
  75. 10M45 current source
  76. 12bh7 in place of ecc82
  77. High voltage winding no center tap?
  78. Marantz 8b recap
  79. Pair Quad II in all original condition... restore or sell
  80. Where to find tube designers for hire?
  81. 10M45S problem
  82. 300B Load Line and Bias?
  83. Looking for little help with Glassware Janus shunt reg
  84. Quick question about grounding
  85. Source for 6jg5 or equivalent in Europe
  86. Need your help: Change from el34 to 6550 ends in a desaster
  87. conn el 6026 tube amp schematic for hifi stereo
  88. GE 211 "flash" question
  89. Learned something (the hard way) about mica capacitors
  90. Aikido octal floating output
  91. Screened cable for rewiring valve amp
  92. Fault developed, producing static noise
  93. Tubelab SE buzz and crackle
  94. EL34+Ecc83 amp hum
  95. Gold plated Dynaco ST-70 for $3k
  96. Preamp noise level ?
  97. KOSS A1220 - Vintage Tube Headphone Amp - Diagnose and Mod questions...
  98. Rectifier tube cathode and heater
  99. testing voltage on tube filament, without the tube
  100. New semi-custom metal chassis manufacturer
  101. 55 WPC 1625 Mono Block Amps
  102. Masco C-10 Mic/Phono Amp
  103. New driver stage for dynaco mk3
  104. Power Transformer Issue
  105. Marantz 8B
  106. Safety questions
  107. Step Attenuator
  108. amplifier output impedance measurement
  109. Regulated Vs Non-regulated linear Power Supply
  110. Single RIAA passive eq design for differential DC coupled tube circuit
  111. Amp to Drive Lowther DX3's in Rear Loaded Horn
  112. Anyone know what's going on with Antek?
  113. Sources of 120hz hum?
  114. make adapter from 6n2p to 12ax7
  115. DC coupling with a choke?
  116. help with hum 12ax7 preamp
  117. Signal->crossover->3 amps->speaker
  118. I want to build an inexpensive EL 84 integrated amp with a phono section.
  119. Scott17 KT88 SE Tube Amp Build Log
  120. heater currents
  121. 300B Orientation so logo faces forward
  122. Leak stereo 20
  123. Suggestion: Output tube in SET amp for midbass frequency
  124. Monster Hammond Output XFMRs
  125. 6A3 / 6B4G Design
  126. DC7 MK3 up and running.
  127. Marrantz Model 9 Transformer Buy
  128. 6N2P/6Н2П low plate current increases noise?
  129. first tube amp
  130. rogers cadet 111 or Quad 11
  131. New FM-3 Motherboard
  132. 12ax7(ecc83) and 6n2p 12ax7...........differents??
  133. Heater supply
  134. Very upgraded ST-70 kit/build w/ 6550 tubes
  135. Marantz 8b Electrolytics
  136. How biasing mA in tubes
  137. PSU id and help (psu designer ii)
  138. The all DHT SET Headphone Amp
  139. Assistance with rectifiers in PSUD
  140. Music Angel XD 500 MkII Bias setting
  141. Magnoval
  142. S.E.X. amp plate chokes replacements
  143. Ampex 600 Questions
  144. Antek out of business until April
  145. SE EL34 in triode schematic
  146. Sylvania Console?
  147. Can output transfomers be pick and mixed?
  148. i have just notice that my yaqin 2100 vk bias settings is all over the place.
  149. Preamp Design Review Request
  150. Red Plate Of Doom
  151. LED cathode bias noise issue
  152. PCL86 se amplif.
  153. Is This a good Amplier?
  154. Question: Class AB Hybrid with small signal triode and Power Mosfet output?
  155. Contemporary Transformer for Doubler
  156. The volume pot - The hidden villain of preamp
  157. Heathkit EUW-15 Univ. Power Supply (Tube)
  158. diamond cathode tubes
  159. 6146B
  160. ef86 based preamp
  161. 12FQ7 Why and will it be shortage?
  162. Trouble w/ Maida regulator bias supply
  163. impedance calculations
  164. calibrate stark 8-77?
  165. EZLoad Dummy Load
  166. Best kit for a rookie tube builder
  167. schematic question? 805 feedback
  168. 6av5ga distortion spectrum
  169. Single stage line with anode-cathode feedback
  170. VNAV' SUMO Contest 2011
  171. Direct heated triode (dht) cathode bypass: different options
  172. choice of driver for RS 241
  173. Wiring up 3 6.3 Volt Heaters to a 12V supply
  174. Adding LED's to my tubes4hifi sp6 preamp
  175. Stripped down HK A-300
  176. Westrex 2332A amplifiers
  177. Leak st20
  178. Where could I find these sockets???
  179. Hammond L-112
  180. 4-pin tube socket spring clips
  181. Quad FM1 tuner, could be in wrong section
  182. My first tube amp and speaker build I'm loven it
  183. 211 IT amp, battery vs fixed bias
  184. 300B Tube Failure
  185. how to see if a Mullard 12ax7 reissue is long or short plate
  186. Can capacitors, how do they fail?
  187. Long Preamp to Power Amp Cable Lengths
  188. My time at Hovland - HP-100 Lore
  189. hybrid quad design
  190. TooB NooB: Options?
  191. Preamp grounding
  192. Express PCB and POV-ray
  193. Looking for circuit of SE amp. for 4D32
  194. 865 tetrode in triode mode...WOW !
  195. MP-2A preamp
  196. Is a 7 watt per channel amp enough
  197. Help: Interstage Transformer for 7788 (E810F) Tube in Triode ?
  198. Transformers
  199. Pentode curves for GU 50 SE amp with 700V B+
  200. Valve op-amp pre ?
  201. Use only half of OPT secondary?
  202. On/Off cycling
  203. Tube operating points help
  204. OTL Heater Questions
  205. tube output question
  206. RIAA LCR Mythos
  207. first tube amp
  208. M135 retubing and eventual modification
  209. Taylor 211 vs. GE 211
  210. regulated
  211. What should I do with these eico hf-12's?
  212. Dynaco mk3 clone hum issue
  213. First DIY project, which SE tube amp should I build?
  214. 6n11 tube headphone amp
  215. Kt88 Pin alignement problem=did a mistake
  216. LTspice Frustration...help, please..
  217. Bias mods
  218. Maida tracking preregulator?
  219. 230 VAC to 2*140 VAC transformer - 20VA
  220. Re gettering?
  221. Distortion rise on OPT
  222. How to build a transconductance tester for small driver tubes?
  223. Musical Fidelity X-10D Cap Mod
  224. 6N3 & 6E2 tubes.
  225. help with local nfb
  226. What should I build
  227. leak st20
  228. Wright Audio WPA 3.5 Humpot & schematics
  229. the old light bulb trick
  230. Dynaco ST70 KIT - your opinion please
  231. Wire for tubes using a plate cap?
  232. Lundahl LL1660 OPT Franks 6SN7 linestage
  233. GU-50 PP + 10k:16-8-4 Ohm ,20w OPT..what is the best to do?
  234. Tomiko 10k PP transformer?
  235. Powerdrive for higher grid wattage A2 transmitter tubes
  236. Marantz Model 5 Amps and Model Seven Preamp
  237. How to calculate output transformers
  238. Grounding considerations with external PS
  239. Cathodyne fet buffered balanced line out
  240. 807pp + input phase splitter
  241. leak st 20
  242. Questions about Champ mods, NF loop and more
  243. Does anyone know what this is!..???
  244. Thought Exercise: Submini Circlotron OTL Amp
  245. Preamp Grounding PCB
  246. Manley 440: Tubes red cherry after replacing old tubes with new ones
  247. EL95 Parallel Push Pull design
  248. What is the ideal low-noise heater power for high-power output tubes?
  249. Beijing 6N6T
  250. Tube recomedations for my first tube amp

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