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  1. testing voltage on tube filament, without the tube
  2. New semi-custom metal chassis manufacturer
  3. 55 WPC 1625 Mono Block Amps
  4. Masco C-10 Mic/Phono Amp
  5. New driver stage for dynaco mk3
  6. Power Transformer Issue
  7. Marantz 8B
  8. Safety questions
  9. Step Attenuator
  10. amplifier output impedance measurement
  11. Regulated Vs Non-regulated linear Power Supply
  12. Single RIAA passive eq design for differential DC coupled tube circuit
  13. Amp to Drive Lowther DX3's in Rear Loaded Horn
  14. Anyone know what's going on with Antek?
  15. Sources of 120hz hum?
  16. make adapter from 6n2p to 12ax7
  17. DC coupling with a choke?
  18. help with hum 12ax7 preamp
  19. Signal->crossover->3 amps->speaker
  20. I want to build an inexpensive EL 84 integrated amp with a phono section.
  21. Scott17 KT88 SE Tube Amp Build Log
  22. heater currents
  23. 300B Orientation so logo faces forward
  24. Leak stereo 20
  25. Suggestion: Output tube in SET amp for midbass frequency
  26. Monster Hammond Output XFMRs
  27. 6A3 / 6B4G Design
  28. DC7 MK3 up and running.
  29. Marrantz Model 9 Transformer Buy
  30. 6N2P/6Н2П low plate current increases noise?
  31. first tube amp
  32. rogers cadet 111 or Quad 11
  33. New FM-3 Motherboard
  34. 12ax7(ecc83) and 6n2p 12ax7...........differents??
  35. Heater supply
  36. Very upgraded ST-70 kit/build w/ 6550 tubes
  37. Marantz 8b Electrolytics
  38. How biasing mA in tubes
  39. PSU id and help (psu designer ii)
  40. The all DHT SET Headphone Amp
  41. Assistance with rectifiers in PSUD
  42. Music Angel XD 500 MkII Bias setting
  43. Magnoval
  44. S.E.X. amp plate chokes replacements
  45. Ampex 600 Questions
  46. Antek out of business until April
  47. SE EL34 in triode schematic
  48. Sylvania Console?
  49. Can output transfomers be pick and mixed?
  50. i have just notice that my yaqin 2100 vk bias settings is all over the place.
  51. Preamp Design Review Request
  52. Red Plate Of Doom
  53. LED cathode bias noise issue
  54. PCL86 se amplif.
  55. Is This a good Amplier?
  56. Question: Class AB Hybrid with small signal triode and Power Mosfet output?
  57. Contemporary Transformer for Doubler
  58. The volume pot - The hidden villain of preamp
  59. Heathkit EUW-15 Univ. Power Supply (Tube)
  60. diamond cathode tubes
  61. 6146B
  62. ef86 based preamp
  63. 12FQ7 Why and will it be shortage?
  64. Trouble w/ Maida regulator bias supply
  65. impedance calculations
  66. calibrate stark 8-77?
  67. EZLoad Dummy Load
  68. Best kit for a rookie tube builder
  69. schematic question? 805 feedback
  70. 6av5ga distortion spectrum
  71. Single stage line with anode-cathode feedback
  72. VNAV' SUMO Contest 2011
  73. Direct heated triode (dht) cathode bypass: different options
  74. choice of driver for RS 241
  75. Wiring up 3 6.3 Volt Heaters to a 12V supply
  76. Adding LED's to my tubes4hifi sp6 preamp
  77. Stripped down HK A-300
  78. Westrex 2332A amplifiers
  79. Leak st20
  80. Where could I find these sockets???
  81. Hammond L-112
  82. 4-pin tube socket spring clips
  83. Quad FM1 tuner, could be in wrong section
  84. My first tube amp and speaker build I'm loven it
  85. 211 IT amp, battery vs fixed bias
  86. 300B Tube Failure
  87. how to see if a Mullard 12ax7 reissue is long or short plate
  88. Can capacitors, how do they fail?
  89. Long Preamp to Power Amp Cable Lengths
  90. My time at Hovland - HP-100 Lore
  91. hybrid quad design
  92. TooB NooB: Options?
  93. Preamp grounding
  94. Express PCB and POV-ray
  95. Looking for circuit of SE amp. for 4D32
  96. 865 tetrode in triode mode...WOW !
  97. MP-2A preamp
  98. Is a 7 watt per channel amp enough
  99. Help: Interstage Transformer for 7788 (E810F) Tube in Triode ?
  100. Transformers
  101. Pentode curves for GU 50 SE amp with 700V B+
  102. Valve op-amp pre ?
  103. Use only half of OPT secondary?
  104. On/Off cycling
  105. Tube operating points help
  106. OTL Heater Questions
  107. tube output question
  108. RIAA LCR Mythos
  109. first tube amp
  110. M135 retubing and eventual modification
  111. Taylor 211 vs. GE 211
  112. regulated
  113. What should I do with these eico hf-12's?
  114. Dynaco mk3 clone hum issue
  115. First DIY project, which SE tube amp should I build?
  116. 6n11 tube headphone amp
  117. Kt88 Pin alignement problem=did a mistake
  118. LTspice Frustration...help, please..
  119. Bias mods
  120. Maida tracking preregulator?
  121. 230 VAC to 2*140 VAC transformer - 20VA
  122. Re gettering?
  123. Distortion rise on OPT
  124. How to build a transconductance tester for small driver tubes?
  125. Musical Fidelity X-10D Cap Mod
  126. 6N3 & 6E2 tubes.
  127. help with local nfb
  128. What should I build
  129. leak st20
  130. Wright Audio WPA 3.5 Humpot & schematics
  131. the old light bulb trick
  132. Dynaco ST70 KIT - your opinion please
  133. Wire for tubes using a plate cap?
  134. Lundahl LL1660 OPT Franks 6SN7 linestage
  135. GU-50 PP + 10k:16-8-4 Ohm ,20w OPT..what is the best to do?
  136. Tomiko 10k PP transformer?
  137. Powerdrive for higher grid wattage A2 transmitter tubes
  138. Marantz Model 5 Amps and Model Seven Preamp
  139. How to calculate output transformers
  140. Grounding considerations with external PS
  141. Cathodyne fet buffered balanced line out
  142. 807pp + input phase splitter
  143. leak st 20
  144. Questions about Champ mods, NF loop and more
  145. Does anyone know what this is!..???
  146. Thought Exercise: Submini Circlotron OTL Amp
  147. Preamp Grounding PCB
  148. Manley 440: Tubes red cherry after replacing old tubes with new ones
  149. EL95 Parallel Push Pull design
  150. What is the ideal low-noise heater power for high-power output tubes?
  151. Beijing 6N6T
  152. Tube recomedations for my first tube amp
  153. Tube Load Lines and B+
  154. Hybrid rectifier possible in PSUD?
  155. Hickok calibration
  156. Bias voltage slower to come up
  157. Can You Reccommend a 6922 tube?
  158. Miniblok Resistor Parameter Modulation using Pots
  159. gm70 driver tube tests
  160. 300B Globe physical dimensions
  161. DIY Fisher 800b into a mic pre
  162. OPT Modification Question-Help please?
  163. Cant find origin
  164. Fixing Sneaky Oscillation in P-P Amplifiers
  165. fu-29 Audioromy
  166. Almarro A205A as experimentation platform
  167. Thoughts on layout and potential for improvements
  168. What is the difference between "rectifier tubes" and "power tubes"
  169. uTracer...
  170. EL84/UL84 single valve amp
  171. Mic preamp - strange high frequency roll off problem
  172. Tissbury audio
  173. midification to srpp preamplifier input voltage
  174. DHT SE amp with ultrapath
  175. Tube mic preamp problem
  176. Output transformer: reasons for destruction?
  177. Bewitch KT88
  178. SE OPT Wiring
  179. maggie 185 to stereo guitar amp?
  180. Budget 300b tubes recommendations
  181. Hum problem through one channel
  182. Audio Research LS22 DIY
  183. 300V Tube Power Supply From 120VAC Without Rectifier?
  184. NOS Tube: Black Spot on Getter Flashing? Help
  185. FET Source Follower Distortion
  186. TUBE/MOSFET/BJT hibrid amp
  187. PYE Black Box amplifier
  188. Tube tester
  189. what OPT for 211 parallel SE amp?
  190. Opinions for 6550 bias.
  191. 832A as a Single Ended Tetrode Amp?
  192. DCPP - "Engineer's Amplifier" : Need a bit of help
  193. quicky rebuild 6v6 to 807
  194. Old fire bottles.
  195. Regulated Power Supply using 6550
  196. GU50 SE vs 300B SE tube amp??
  197. Help with voltages
  198. New to valves & this forum.
  199. new amp 2a3 pp
  200. Telefunken EL153 SE circuity
  201. RH 84 Variation: Direct Coupled Pentode
  202. Single Transformer, two valve rectifiers
  203. Capacitors for Radio Frequency Amlifier and Converter Oscillator Tubes
  204. Tube Screening Cans
  205. PSU grounding
  206. 6AX4GT TV damper
  207. plate on chinese 6L6 red on one side
  208. FM stereo decoder
  209. Under the Christmas Tree - Valve Amplifiers 4th Ed.
  210. Using those dern 1625 tubes: a simple SEP amplifier
  211. Pairs of resistors in opposite directions
  212. 45 spice model
  213. APEX 460 Tube mic modification
  214. EL84 and 6BQ5 are Same?
  215. Simple hybrid amplifier (35W/8Ohm)
  216. Yaqin mc 10l or qinpu 6000 mkii
  217. Reported attack site?
  218. LCR RIAA Phono with DHTs
  219. New Here -Would Like to Build
  220. 12E1 push pull poweramp
  221. marantz model 9
  222. I would appreciate some helpfull advice from Aikido builders
  223. Dynaco ST70 big Snorting noise.
  224. Good Soft Distortion
  225. magnavox 8301 revamp, need's a second look
  226. Circuit or schematic for current source of 7.5mA
  227. Sakuma's bleeder tubes and series connected transfomers
  228. Tube measurement
  229. adding tone control to SE 6v6 amp
  230. Easy Little 6L6 SE
  231. knight KA-55
  232. Hum in tube amp
  233. Lundahl LL1660 10 mA Alt V
  234. 12au7 valve preamp (again?)
  235. Simple DC heating question
  236. 6146B?
  237. Reduce gain on power amp?
  238. ES9023 DAC(subbu) + Tube Preamp with Remote and R2R volume control(Danzup)
  239. AC heaters question
  240. Anyone tried this Mcintosh c22 knock off.
  241. Help me to find pins for tube socket
  242. HT delay pcb...
  243. Power supply, heater questions...
  244. Heathkit AA-151, to separate pre-amp advise needed?
  245. grounding
  246. 2 Stage GM-70 amp in A2... possible?
  247. GlassWare Janus Shunt Rectifier Tube Swap
  248. Schematics
  249. SE 6B4G driver tube options?
  250. seeking datasheet of 6J2B-V in english

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