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  1. Got some 6n3c-e (6p3s-e)with blank bulb?
  2. Graaf GM-20
  3. medium power OTL circlotron amplifier
  4. Help me identity this amp
  5. Hajdinjak preamp + 2x mono tube amp -What to do?
  6. Moscode 600 Noisy Fan
  7. component reduction in signal chain
  8. Aikido with Stax
  9. 'High power' shunt regulator
  10. Help need on Xindak XA3200MII hybrid pre-amplifier
  11. ideas for tube burn in / bias match station
  12. KT120 triode operation single stage amp
  13. Question regarding 7199 Tube wiring
  14. Why do modern PP OPTs have 16 Ohm taps?
  15. 10M45 current source
  16. 12bh7 in place of ecc82
  17. High voltage winding no center tap?
  18. Marantz 8b recap
  19. Pair Quad II in all original condition... restore or sell
  20. Where to find tube designers for hire?
  21. 10M45S problem
  22. 300B Load Line and Bias?
  23. Looking for little help with Glassware Janus shunt reg
  24. Quick question about grounding
  25. Source for 6jg5 or equivalent in Europe
  26. Need your help: Change from el34 to 6550 ends in a desaster
  27. conn el 6026 tube amp schematic for hifi stereo
  28. GE 211 "flash" question
  29. Learned something (the hard way) about mica capacitors
  30. Aikido octal floating output
  31. Screened cable for rewiring valve amp
  32. Fault developed, producing static noise
  33. Tubelab SE buzz and crackle
  34. EL34+Ecc83 amp hum
  35. Gold plated Dynaco ST-70 for $3k
  36. Preamp noise level ?
  37. KOSS A1220 - Vintage Tube Headphone Amp - Diagnose and Mod questions...
  38. Rectifier tube cathode and heater
  39. testing voltage on tube filament, without the tube
  40. New semi-custom metal chassis manufacturer
  41. 55 WPC 1625 Mono Block Amps
  42. Masco C-10 Mic/Phono Amp
  43. New driver stage for dynaco mk3
  44. Power Transformer Issue
  45. Marantz 8B
  46. Safety questions
  47. Step Attenuator
  48. amplifier output impedance measurement
  49. Regulated Vs Non-regulated linear Power Supply
  50. Single RIAA passive eq design for differential DC coupled tube circuit
  51. Amp to Drive Lowther DX3's in Rear Loaded Horn
  52. Anyone know what's going on with Antek?
  53. Sources of 120hz hum?
  54. make adapter from 6n2p to 12ax7
  55. DC coupling with a choke?
  56. help with hum 12ax7 preamp
  57. Signal->crossover->3 amps->speaker
  58. I want to build an inexpensive EL 84 integrated amp with a phono section.
  59. Scott17 KT88 SE Tube Amp Build Log
  60. heater currents
  61. 300B Orientation so logo faces forward
  62. Leak stereo 20
  63. Suggestion: Output tube in SET amp for midbass frequency
  64. Monster Hammond Output XFMRs
  65. 6A3 / 6B4G Design
  66. DC7 MK3 up and running.
  67. Marrantz Model 9 Transformer Buy
  68. 6N2P/6Н2П low plate current increases noise?
  69. first tube amp
  70. rogers cadet 111 or Quad 11
  71. New FM-3 Motherboard
  72. 12ax7(ecc83) and 6n2p 12ax7...........differents??
  73. Heater supply
  74. Very upgraded ST-70 kit/build w/ 6550 tubes
  75. Marantz 8b Electrolytics
  76. How biasing mA in tubes
  77. PSU id and help (psu designer ii)
  78. The all DHT SET Headphone Amp
  79. Assistance with rectifiers in PSUD
  80. Music Angel XD 500 MkII Bias setting
  81. Magnoval
  82. S.E.X. amp plate chokes replacements
  83. Ampex 600 Questions
  84. Antek out of business until April
  85. SE EL34 in triode schematic
  86. Sylvania Console?
  87. Can output transfomers be pick and mixed?
  88. i have just notice that my yaqin 2100 vk bias settings is all over the place.
  89. Preamp Design Review Request
  90. Red Plate Of Doom
  91. LED cathode bias noise issue
  92. PCL86 se amplif.
  93. Is This a good Amplier?
  94. Question: Class AB Hybrid with small signal triode and Power Mosfet output?
  95. Contemporary Transformer for Doubler
  96. The volume pot - The hidden villain of preamp
  97. Heathkit EUW-15 Univ. Power Supply (Tube)
  98. diamond cathode tubes
  99. 6146B
  100. ef86 based preamp
  101. 12FQ7 Why and will it be shortage?
  102. Trouble w/ Maida regulator bias supply
  103. impedance calculations
  104. calibrate stark 8-77?
  105. EZLoad Dummy Load
  106. Best kit for a rookie tube builder
  107. schematic question? 805 feedback
  108. 6av5ga distortion spectrum
  109. Single stage line with anode-cathode feedback
  110. VNAV' SUMO Contest 2011
  111. Direct heated triode (dht) cathode bypass: different options
  112. choice of driver for RS 241
  113. Wiring up 3 6.3 Volt Heaters to a 12V supply
  114. Adding LED's to my tubes4hifi sp6 preamp
  115. Stripped down HK A-300
  116. Westrex 2332A amplifiers
  117. Leak st20
  118. Where could I find these sockets???
  119. Hammond L-112
  120. 4-pin tube socket spring clips
  121. Quad FM1 tuner, could be in wrong section
  122. My first tube amp and speaker build I'm loven it
  123. 211 IT amp, battery vs fixed bias
  124. 300B Tube Failure
  125. how to see if a Mullard 12ax7 reissue is long or short plate
  126. Can capacitors, how do they fail?
  127. Long Preamp to Power Amp Cable Lengths
  128. My time at Hovland - HP-100 Lore
  129. hybrid quad design
  130. TooB NooB: Options?
  131. Preamp grounding
  132. Express PCB and POV-ray
  133. Looking for circuit of SE amp. for 4D32
  134. 865 tetrode in triode mode...WOW !
  135. MP-2A preamp
  136. Is a 7 watt per channel amp enough
  137. Help: Interstage Transformer for 7788 (E810F) Tube in Triode ?
  138. Transformers
  139. Pentode curves for GU 50 SE amp with 700V B+
  140. Valve op-amp pre ?
  141. Use only half of OPT secondary?
  142. On/Off cycling
  143. Tube operating points help
  144. OTL Heater Questions
  145. tube output question
  146. RIAA LCR Mythos
  147. first tube amp
  148. M135 retubing and eventual modification
  149. Taylor 211 vs. GE 211
  150. regulated
  151. What should I do with these eico hf-12's?
  152. Dynaco mk3 clone hum issue
  153. First DIY project, which SE tube amp should I build?
  154. 6n11 tube headphone amp
  155. Kt88 Pin alignement problem=did a mistake
  156. LTspice Frustration...help, please..
  157. Bias mods
  158. Maida tracking preregulator?
  159. 230 VAC to 2*140 VAC transformer - 20VA
  160. Re gettering?
  161. Distortion rise on OPT
  162. How to build a transconductance tester for small driver tubes?
  163. Musical Fidelity X-10D Cap Mod
  164. 6N3 & 6E2 tubes.
  165. help with local nfb
  166. What should I build
  167. leak st20
  168. Wright Audio WPA 3.5 Humpot & schematics
  169. the old light bulb trick
  170. Dynaco ST70 KIT - your opinion please
  171. Wire for tubes using a plate cap?
  172. Lundahl LL1660 OPT Franks 6SN7 linestage
  173. GU-50 PP + 10k:16-8-4 Ohm ,20w OPT..what is the best to do?
  174. Tomiko 10k PP transformer?
  175. Powerdrive for higher grid wattage A2 transmitter tubes
  176. Marantz Model 5 Amps and Model Seven Preamp
  177. How to calculate output transformers
  178. Grounding considerations with external PS
  179. Cathodyne fet buffered balanced line out
  180. 807pp + input phase splitter
  181. leak st 20
  182. Questions about Champ mods, NF loop and more
  183. Does anyone know what this is!..???
  184. Thought Exercise: Submini Circlotron OTL Amp
  185. Preamp Grounding PCB
  186. Manley 440: Tubes red cherry after replacing old tubes with new ones
  187. EL95 Parallel Push Pull design
  188. What is the ideal low-noise heater power for high-power output tubes?
  189. Beijing 6N6T
  190. Tube recomedations for my first tube amp
  191. Tube Load Lines and B+
  192. Hybrid rectifier possible in PSUD?
  193. Hickok calibration
  194. Bias voltage slower to come up
  195. Can You Reccommend a 6922 tube?
  196. Miniblok Resistor Parameter Modulation using Pots
  197. gm70 driver tube tests
  198. 300B Globe physical dimensions
  199. DIY Fisher 800b into a mic pre
  200. OPT Modification Question-Help please?
  201. Cant find origin
  202. Fixing Sneaky Oscillation in P-P Amplifiers
  203. fu-29 Audioromy
  204. Almarro A205A as experimentation platform
  205. Thoughts on layout and potential for improvements
  206. What is the difference between "rectifier tubes" and "power tubes"
  207. uTracer...
  208. EL84/UL84 single valve amp
  209. Mic preamp - strange high frequency roll off problem
  210. Tissbury audio
  211. midification to srpp preamplifier input voltage
  212. DHT SE amp with ultrapath
  213. Tube mic preamp problem
  214. Output transformer: reasons for destruction?
  215. Bewitch KT88
  216. SE OPT Wiring
  217. maggie 185 to stereo guitar amp?
  218. Budget 300b tubes recommendations
  219. Hum problem through one channel
  220. Audio Research LS22 DIY
  221. 300V Tube Power Supply From 120VAC Without Rectifier?
  222. NOS Tube: Black Spot on Getter Flashing? Help
  223. FET Source Follower Distortion
  224. TUBE/MOSFET/BJT hibrid amp
  225. PYE Black Box amplifier
  226. Tube tester
  227. what OPT for 211 parallel SE amp?
  228. Opinions for 6550 bias.
  229. 832A as a Single Ended Tetrode Amp?
  230. DCPP - "Engineer's Amplifier" : Need a bit of help
  231. quicky rebuild 6v6 to 807
  232. Old fire bottles.
  233. Regulated Power Supply using 6550
  234. GU50 SE vs 300B SE tube amp??
  235. Help with voltages
  236. New to valves & this forum.
  237. new amp 2a3 pp
  238. Telefunken EL153 SE circuity
  239. RH 84 Variation: Direct Coupled Pentode
  240. Single Transformer, two valve rectifiers
  241. Capacitors for Radio Frequency Amlifier and Converter Oscillator Tubes
  242. Tube Screening Cans
  243. PSU grounding
  244. 6AX4GT TV damper
  245. plate on chinese 6L6 red on one side
  246. FM stereo decoder
  247. Under the Christmas Tree - Valve Amplifiers 4th Ed.
  248. Using those dern 1625 tubes: a simple SEP amplifier
  249. Pairs of resistors in opposite directions
  250. 45 spice model

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