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  1. Long Preamp to Power Amp Cable Lengths
  2. My time at Hovland - HP-100 Lore
  3. hybrid quad design
  4. TooB NooB: Options?
  5. Preamp grounding
  6. Express PCB and POV-ray
  7. Looking for circuit of SE amp. for 4D32
  8. 865 tetrode in triode mode...WOW !
  9. MP-2A preamp
  10. Is a 7 watt per channel amp enough
  11. Help: Interstage Transformer for 7788 (E810F) Tube in Triode ?
  12. Transformers
  13. Pentode curves for GU 50 SE amp with 700V B+
  14. Valve op-amp pre ?
  15. Use only half of OPT secondary?
  16. On/Off cycling
  17. Tube operating points help
  18. OTL Heater Questions
  19. tube output question
  20. RIAA LCR Mythos
  21. first tube amp
  22. M135 retubing and eventual modification
  23. Taylor 211 vs. GE 211
  24. regulated
  25. What should I do with these eico hf-12's?
  26. Dynaco mk3 clone hum issue
  27. First DIY project, which SE tube amp should I build?
  28. 6n11 tube headphone amp
  29. Kt88 Pin alignement problem=did a mistake
  30. LTspice Frustration...help, please..
  31. Bias mods
  32. Maida tracking preregulator?
  33. 230 VAC to 2*140 VAC transformer - 20VA
  34. Re gettering?
  35. Distortion rise on OPT
  36. How to build a transconductance tester for small driver tubes?
  37. Musical Fidelity X-10D Cap Mod
  38. 6N3 & 6E2 tubes.
  39. help with local nfb
  40. What should I build
  41. leak st20
  42. Wright Audio WPA 3.5 Humpot & schematics
  43. the old light bulb trick
  44. Dynaco ST70 KIT - your opinion please
  45. Wire for tubes using a plate cap?
  46. Lundahl LL1660 OPT Franks 6SN7 linestage
  47. GU-50 PP + 10k:16-8-4 Ohm ,20w OPT..what is the best to do?
  48. Tomiko 10k PP transformer?
  49. Powerdrive for higher grid wattage A2 transmitter tubes
  50. Marantz Model 5 Amps and Model Seven Preamp
  51. How to calculate output transformers
  52. Grounding considerations with external PS
  53. Cathodyne fet buffered balanced line out
  54. 807pp + input phase splitter
  55. leak st 20
  56. Questions about Champ mods, NF loop and more
  57. Does anyone know what this is!..???
  58. Thought Exercise: Submini Circlotron OTL Amp
  59. Preamp Grounding PCB
  60. Manley 440: Tubes red cherry after replacing old tubes with new ones
  61. EL95 Parallel Push Pull design
  62. What is the ideal low-noise heater power for high-power output tubes?
  63. Beijing 6N6T
  64. Tube recomedations for my first tube amp
  65. Tube Load Lines and B+
  66. Hybrid rectifier possible in PSUD?
  67. Hickok calibration
  68. Bias voltage slower to come up
  69. Can You Reccommend a 6922 tube?
  70. Miniblok Resistor Parameter Modulation using Pots
  71. gm70 driver tube tests
  72. 300B Globe physical dimensions
  73. DIY Fisher 800b into a mic pre
  74. OPT Modification Question-Help please?
  75. Cant find origin
  76. Fixing Sneaky Oscillation in P-P Amplifiers
  77. fu-29 Audioromy
  78. Almarro A205A as experimentation platform
  79. Thoughts on layout and potential for improvements
  80. What is the difference between "rectifier tubes" and "power tubes"
  81. uTracer...
  82. EL84/UL84 single valve amp
  83. Mic preamp - strange high frequency roll off problem
  84. Tissbury audio
  85. midification to srpp preamplifier input voltage
  86. DHT SE amp with ultrapath
  87. Tube mic preamp problem
  88. Output transformer: reasons for destruction?
  89. Bewitch KT88
  90. SE OPT Wiring
  91. maggie 185 to stereo guitar amp?
  92. Budget 300b tubes recommendations
  93. Hum problem through one channel
  94. Audio Research LS22 DIY
  95. 300V Tube Power Supply From 120VAC Without Rectifier?
  96. NOS Tube: Black Spot on Getter Flashing? Help
  97. FET Source Follower Distortion
  98. TUBE/MOSFET/BJT hibrid amp
  99. PYE Black Box amplifier
  100. Tube tester
  101. what OPT for 211 parallel SE amp?
  102. Opinions for 6550 bias.
  103. 832A as a Single Ended Tetrode Amp?
  104. DCPP - "Engineer's Amplifier" : Need a bit of help
  105. quicky rebuild 6v6 to 807
  106. Old fire bottles.
  107. Regulated Power Supply using 6550
  108. GU50 SE vs 300B SE tube amp??
  109. Help with voltages
  110. New to valves & this forum.
  111. new amp 2a3 pp
  112. Telefunken EL153 SE circuity
  113. RH 84 Variation: Direct Coupled Pentode
  114. Single Transformer, two valve rectifiers
  115. Capacitors for Radio Frequency Amlifier and Converter Oscillator Tubes
  116. Tube Screening Cans
  117. PSU grounding
  118. 6AX4GT TV damper
  119. plate on chinese 6L6 red on one side
  120. FM stereo decoder
  121. Under the Christmas Tree - Valve Amplifiers 4th Ed.
  122. Using those dern 1625 tubes: a simple SEP amplifier
  123. Pairs of resistors in opposite directions
  124. 45 spice model
  125. APEX 460 Tube mic modification
  126. EL84 and 6BQ5 are Same?
  127. Simple hybrid amplifier (35W/8Ohm)
  128. Yaqin mc 10l or qinpu 6000 mkii
  129. Reported attack site?
  130. LCR RIAA Phono with DHTs
  131. New Here -Would Like to Build
  132. 12E1 push pull poweramp
  133. marantz model 9
  134. I would appreciate some helpfull advice from Aikido builders
  135. Dynaco ST70 big Snorting noise.
  136. Good Soft Distortion
  137. magnavox 8301 revamp, need's a second look
  138. Circuit or schematic for current source of 7.5mA
  139. Sakuma's bleeder tubes and series connected transfomers
  140. Tube measurement
  141. adding tone control to SE 6v6 amp
  142. Easy Little 6L6 SE
  143. knight KA-55
  144. Hum in tube amp
  145. Lundahl LL1660 10 mA Alt V
  146. 12au7 valve preamp (again?)
  147. Simple DC heating question
  148. 6146B?
  149. Reduce gain on power amp?
  150. ES9023 DAC(subbu) + Tube Preamp with Remote and R2R volume control(Danzup)
  151. AC heaters question
  152. Anyone tried this Mcintosh c22 knock off.
  153. Help me to find pins for tube socket
  154. HT delay pcb...
  155. Power supply, heater questions...
  156. Heathkit AA-151, to separate pre-amp advise needed?
  157. grounding
  158. 2 Stage GM-70 amp in A2... possible?
  159. GlassWare Janus Shunt Rectifier Tube Swap
  160. Schematics
  161. SE 6B4G driver tube options?
  162. seeking datasheet of 6J2B-V in english
  163. Nailing Hum in my Phono Stage
  164. Shaving voltage off HV supply?
  165. LEAK T12 and POINT ONE - worth having ?
  166. Quicksilvers Mid Mono Schematic?
  167. Russian & East European Tube Factory Logos
  168. Lampizator Channel
  169. RIAA triode or pentode
  170. Cute Little Tube Oscilloscope, Thought I'd share.
  171. Is it really possible to deliver 2W into 40 ohms with an SET ?
  172. se
  173. Connecting Two Amps to Common Input
  174. Wiring Aikido using LSA/HPA switch
  175. Most exotic SET power amplifier
  176. Help with rogers cadet 3 integrated
  177. Opamps for servos in tube amps - Christmas gift from LT, 12-12-12!
  178. tube amp hum........normal or suggested fix?
  179. Building a beast: Stereo EL84 auto bias PP tube amp
  180. Becker Brescia auto radio
  181. Double feedback pentode Power Stage
  182. Anyone Using Guiguang 300b tubes?
  183. Where to get Audio Note Gaku-On service manual?
  184. Sanity Check - Input Transformer Overshoot
  185. TOA HA-355 vintage tube PA amp schematic
  186. EL34 PushPull UL Amp
  187. 6L6G emission too high
  188. Need help designing BIAS circuit for old Bell amp
  189. Heathkit A-5A 6L6 PP Integrated Amp
  190. Where to put the meter
  191. Radii GS-40pp
  192. Concept dilemma (pre/pwr/spud content)
  193. What to do with these Eimac tubes?
  194. Driving 211 with VT25 or EL34?
  195. DIY AMP start project - Help choosing one
  196. Pilot 248B Amp with weak channel
  197. 6H30 VA stage?
  198. What is the best way to connect DC filaments?
  199. suggestions for a parallel feed 45 amp?
  200. Counterpoint SA 5.1 repairs
  201. The Morgan Jones mini tube headphone Amplifier
  202. Borbely headphone amp
  203. Found An Amplifier In My Basement I'd Forgotten About & Learn It's Sought After
  204. Floating OPT oscilloscope measuraments
  205. I Wasn't Away That Long, What's WIth The Price Hikes On All My Old Toys?
  206. Channel voltage mismatch
  207. OS70/1750 datasheets
  208. Beautiful Chassis
  209. 6A4, 46 and 47...excellent sound tubes !!!!
  210. Is it Overkill to use Duelund Caps in Power Stage (Counterpoint SA-5.1)
  211. Quicksilver M135 Schematic?
  212. recognize this old amp?
  213. grey fogging inside 6sn7
  214. Point to point or pcb?
  215. Quad query
  216. Fixing a Velleman K4040 - Buzz HIss Crackle Blown Tubes
  217. Found Original Genalex 12AX7..Need Advice..
  218. OPT power rating and amplifier power
  219. 6BG6-GA
  220. EL84 driving EL84 SET with fixed bias
  221. P2P 6CG7 Input Buffer
  222. 865 in triode mode...anyone ever tried it?
  223. PP KT88 Amp Low frequency Ringing
  224. World audio designs kel34
  225. Glassware Audio Design
  226. 2A3 mounted horizontally
  227. from tube amp to fm reciever
  228. diy tube amp
  229. Cary 805ae xlr option
  230. ST-70 mono makeover
  231. breaking in audio capacitors
  232. Question about 6V6GT amp schematic
  233. Sherwood Schematic
  234. Ever hear of a D7L1 or D7L3 YR7 tube?
  235. Psvane Replica RCA 2A3 tube - WR2A3
  236. 845 Driver Circuit
  237. ADJUSTABLE BIAS MOD KIT
  238. Gold Lion B749 12au7 Thoughts?
  239. Siliconray SRK 09 tube amp kit help
  240. Quantum minstrel
  241. Does anyone know how John Lee Hooker recorded this? (1949)
  242. Please Identify these black capacitors.
  243. New Tubes too silent (6P15P)
  244. best sounding & value amp kits/designs?
  245. Custom Woodwork For Tube Amp
  246. Tube 2E22 in triode mode
  247. Has anyone built an OTL amp with switch mode power supplies.
  248. Altec 15067 transformers
  249. Some interesting findings with transformers
  250. Bogen KO-60 Output Iron

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