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  1. Pair Quad II in all original condition... restore or sell
  2. Where to find tube designers for hire?
  3. 10M45S problem
  4. 300B Load Line and Bias?
  5. Looking for little help with Glassware Janus shunt reg
  6. Quick question about grounding
  7. Source for 6jg5 or equivalent in Europe
  8. Need your help: Change from el34 to 6550 ends in a desaster
  9. conn el 6026 tube amp schematic for hifi stereo
  10. GE 211 "flash" question
  11. Learned something (the hard way) about mica capacitors
  12. Aikido octal floating output
  13. Screened cable for rewiring valve amp
  14. Fault developed, producing static noise
  15. Tubelab SE buzz and crackle
  16. EL34+Ecc83 amp hum
  17. Gold plated Dynaco ST-70 for $3k
  18. Preamp noise level ?
  19. KOSS A1220 - Vintage Tube Headphone Amp - Diagnose and Mod questions...
  20. Rectifier tube cathode and heater
  21. testing voltage on tube filament, without the tube
  22. New semi-custom metal chassis manufacturer
  23. 55 WPC 1625 Mono Block Amps
  24. Masco C-10 Mic/Phono Amp
  25. New driver stage for dynaco mk3
  26. Power Transformer Issue
  27. Marantz 8B
  28. Safety questions
  29. Step Attenuator
  30. amplifier output impedance measurement
  31. Regulated Vs Non-regulated linear Power Supply
  32. Single RIAA passive eq design for differential DC coupled tube circuit
  33. Amp to Drive Lowther DX3's in Rear Loaded Horn
  34. Anyone know what's going on with Antek?
  35. Sources of 120hz hum?
  36. make adapter from 6n2p to 12ax7
  37. DC coupling with a choke?
  38. help with hum 12ax7 preamp
  39. Signal->crossover->3 amps->speaker
  40. I want to build an inexpensive EL 84 integrated amp with a phono section.
  41. Scott17 KT88 SE Tube Amp Build Log
  42. heater currents
  43. 300B Orientation so logo faces forward
  44. Leak stereo 20
  45. Suggestion: Output tube in SET amp for midbass frequency
  46. Monster Hammond Output XFMRs
  47. 6A3 / 6B4G Design
  48. DC7 MK3 up and running.
  49. Marrantz Model 9 Transformer Buy
  50. 6N2P/6Н2П low plate current increases noise?
  51. first tube amp
  52. rogers cadet 111 or Quad 11
  53. New FM-3 Motherboard
  54. 12ax7(ecc83) and 6n2p 12ax7...........differents??
  55. Heater supply
  56. Very upgraded ST-70 kit/build w/ 6550 tubes
  57. Marantz 8b Electrolytics
  58. How biasing mA in tubes
  59. PSU id and help (psu designer ii)
  60. The all DHT SET Headphone Amp
  61. Assistance with rectifiers in PSUD
  62. Music Angel XD 500 MkII Bias setting
  63. Magnoval
  64. S.E.X. amp plate chokes replacements
  65. Ampex 600 Questions
  66. Antek out of business until April
  67. SE EL34 in triode schematic
  68. Sylvania Console?
  69. Can output transfomers be pick and mixed?
  70. i have just notice that my yaqin 2100 vk bias settings is all over the place.
  71. Preamp Design Review Request
  72. Red Plate Of Doom
  73. LED cathode bias noise issue
  74. PCL86 se amplif.
  75. Is This a good Amplier?
  76. Question: Class AB Hybrid with small signal triode and Power Mosfet output?
  77. Contemporary Transformer for Doubler
  78. The volume pot - The hidden villain of preamp
  79. Heathkit EUW-15 Univ. Power Supply (Tube)
  80. diamond cathode tubes
  81. 6146B
  82. ef86 based preamp
  83. 12FQ7 Why and will it be shortage?
  84. Trouble w/ Maida regulator bias supply
  85. impedance calculations
  86. calibrate stark 8-77?
  87. EZLoad Dummy Load
  88. Best kit for a rookie tube builder
  89. schematic question? 805 feedback
  90. 6av5ga distortion spectrum
  91. Single stage line with anode-cathode feedback
  92. VNAV' SUMO Contest 2011
  93. Direct heated triode (dht) cathode bypass: different options
  94. choice of driver for RS 241
  95. Wiring up 3 6.3 Volt Heaters to a 12V supply
  96. Adding LED's to my tubes4hifi sp6 preamp
  97. Stripped down HK A-300
  98. Westrex 2332A amplifiers
  99. Leak st20
  100. Where could I find these sockets???
  101. Hammond L-112
  102. 4-pin tube socket spring clips
  103. Quad FM1 tuner, could be in wrong section
  104. My first tube amp and speaker build I'm loven it
  105. 211 IT amp, battery vs fixed bias
  106. 300B Tube Failure
  107. how to see if a Mullard 12ax7 reissue is long or short plate
  108. Can capacitors, how do they fail?
  109. Long Preamp to Power Amp Cable Lengths
  110. My time at Hovland - HP-100 Lore
  111. hybrid quad design
  112. TooB NooB: Options?
  113. Preamp grounding
  114. Express PCB and POV-ray
  115. Looking for circuit of SE amp. for 4D32
  116. 865 tetrode in triode mode...WOW !
  117. MP-2A preamp
  118. Is a 7 watt per channel amp enough
  119. Help: Interstage Transformer for 7788 (E810F) Tube in Triode ?
  120. Transformers
  121. Pentode curves for GU 50 SE amp with 700V B+
  122. Valve op-amp pre ?
  123. Use only half of OPT secondary?
  124. On/Off cycling
  125. Tube operating points help
  126. OTL Heater Questions
  127. tube output question
  128. RIAA LCR Mythos
  129. first tube amp
  130. M135 retubing and eventual modification
  131. Taylor 211 vs. GE 211
  132. regulated
  133. What should I do with these eico hf-12's?
  134. Dynaco mk3 clone hum issue
  135. First DIY project, which SE tube amp should I build?
  136. 6n11 tube headphone amp
  137. Kt88 Pin alignement problem=did a mistake
  138. LTspice Frustration...help, please..
  139. Bias mods
  140. Maida tracking preregulator?
  141. 230 VAC to 2*140 VAC transformer - 20VA
  142. Re gettering?
  143. Distortion rise on OPT
  144. How to build a transconductance tester for small driver tubes?
  145. Musical Fidelity X-10D Cap Mod
  146. 6N3 & 6E2 tubes.
  147. help with local nfb
  148. What should I build
  149. leak st20
  150. Wright Audio WPA 3.5 Humpot & schematics
  151. the old light bulb trick
  152. Dynaco ST70 KIT - your opinion please
  153. Wire for tubes using a plate cap?
  154. Lundahl LL1660 OPT Franks 6SN7 linestage
  155. GU-50 PP + 10k:16-8-4 Ohm ,20w OPT..what is the best to do?
  156. Tomiko 10k PP transformer?
  157. Powerdrive for higher grid wattage A2 transmitter tubes
  158. Marantz Model 5 Amps and Model Seven Preamp
  159. How to calculate output transformers
  160. Grounding considerations with external PS
  161. Cathodyne fet buffered balanced line out
  162. 807pp + input phase splitter
  163. leak st 20
  164. Questions about Champ mods, NF loop and more
  165. Does anyone know what this is!..???
  166. Thought Exercise: Submini Circlotron OTL Amp
  167. Preamp Grounding PCB
  168. Manley 440: Tubes red cherry after replacing old tubes with new ones
  169. EL95 Parallel Push Pull design
  170. What is the ideal low-noise heater power for high-power output tubes?
  171. Beijing 6N6T
  172. Tube recomedations for my first tube amp
  173. Tube Load Lines and B+
  174. Hybrid rectifier possible in PSUD?
  175. Hickok calibration
  176. Bias voltage slower to come up
  177. Can You Reccommend a 6922 tube?
  178. Miniblok Resistor Parameter Modulation using Pots
  179. gm70 driver tube tests
  180. 300B Globe physical dimensions
  181. DIY Fisher 800b into a mic pre
  182. OPT Modification Question-Help please?
  183. Cant find origin
  184. Fixing Sneaky Oscillation in P-P Amplifiers
  185. fu-29 Audioromy
  186. Almarro A205A as experimentation platform
  187. Thoughts on layout and potential for improvements
  188. What is the difference between "rectifier tubes" and "power tubes"
  189. uTracer...
  190. EL84/UL84 single valve amp
  191. Mic preamp - strange high frequency roll off problem
  192. Tissbury audio
  193. midification to srpp preamplifier input voltage
  194. DHT SE amp with ultrapath
  195. Tube mic preamp problem
  196. Output transformer: reasons for destruction?
  197. Bewitch KT88
  198. SE OPT Wiring
  199. maggie 185 to stereo guitar amp?
  200. Budget 300b tubes recommendations
  201. Hum problem through one channel
  202. Audio Research LS22 DIY
  203. 300V Tube Power Supply From 120VAC Without Rectifier?
  204. NOS Tube: Black Spot on Getter Flashing? Help
  205. FET Source Follower Distortion
  206. TUBE/MOSFET/BJT hibrid amp
  207. PYE Black Box amplifier
  208. Tube tester
  209. what OPT for 211 parallel SE amp?
  210. Opinions for 6550 bias.
  211. 832A as a Single Ended Tetrode Amp?
  212. DCPP - "Engineer's Amplifier" : Need a bit of help
  213. quicky rebuild 6v6 to 807
  214. Old fire bottles.
  215. Regulated Power Supply using 6550
  216. GU50 SE vs 300B SE tube amp??
  217. Help with voltages
  218. New to valves & this forum.
  219. new amp 2a3 pp
  220. Telefunken EL153 SE circuity
  221. RH 84 Variation: Direct Coupled Pentode
  222. Single Transformer, two valve rectifiers
  223. Capacitors for Radio Frequency Amlifier and Converter Oscillator Tubes
  224. Tube Screening Cans
  225. PSU grounding
  226. 6AX4GT TV damper
  227. plate on chinese 6L6 red on one side
  228. FM stereo decoder
  229. Under the Christmas Tree - Valve Amplifiers 4th Ed.
  230. Using those dern 1625 tubes: a simple SEP amplifier
  231. Pairs of resistors in opposite directions
  232. 45 spice model
  233. APEX 460 Tube mic modification
  234. EL84 and 6BQ5 are Same?
  235. Simple hybrid amplifier (35W/8Ohm)
  236. Yaqin mc 10l or qinpu 6000 mkii
  237. Reported attack site?
  238. LCR RIAA Phono with DHTs
  239. New Here -Would Like to Build
  240. 12E1 push pull poweramp
  241. marantz model 9
  242. I would appreciate some helpfull advice from Aikido builders
  243. Dynaco ST70 big Snorting noise.
  244. Good Soft Distortion
  245. magnavox 8301 revamp, need's a second look
  246. Circuit or schematic for current source of 7.5mA
  247. Sakuma's bleeder tubes and series connected transfomers
  248. Tube measurement
  249. adding tone control to SE 6v6 amp
  250. Easy Little 6L6 SE

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