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  1. Mosfet or other semiconductor substitute for cathodyne?
  2. 6SN7 preamp tube alternative with less gain?
  3. Hagerman Cornet Octal planning help and build
  4. output transformer opposing windings/ please explain
  5. Preamp Transformer overheats
  6. Finishing ASC capacitors
  7. Can't identify this tube?
  8. 6SN7 pin 4 signal input
  9. Help - Tube PSU Design
  10. Little help for a newbie?
  11. Has anyone built this phono stage you can buy on ebay as a circuit board.
  12. pl504 Vacuum tube
  13. Tubes in the Unballancer
  14. Quad II Amplifier KT66 Valves/Tubes and Carbon Composition Resistors
  15. ecc88 preamp
  16. Tube socket center post
  17. Troubleshooting bias of old diy amp with Acrosound TO-300 transformer
  18. Dynaco Mark III with noisy transformer, making hum.
  19. Power amplifier EL 34
  20. Replace 6SN7 to E88CC on HP amp 90VDC plate capable?
  21. 1p24b Russian tube
  22. Tube power supply
  23. Tube-O-Philes, Please help with this chassis search
  24. WOW, I want one !!!
  25. B&K dyna-quick 550
  26. What is this? Valve Amp?
  27. CCS instead of a resistor in the cathode of a cathode follower?
  28. Please comment on D3a tube testing
  29. ID tube amp kit 8 watts stereo.. unsure what tubes to use
  30. Mixed bias for 6336a or 6AS7 output tubes?
  31. Vintage Tube Amp kit - Can it be refurbished?
  32. Any experience or opinion about 300B/EL34 Chinese DIY Kit ...
  33. Measuring "high impedance voltage" with digital multimeter
  34. SE (UL ?) HI FI project needs help
  35. Can anyone verify this math? MC 2205 Watt Scale
  36. Generic design question for Pentode CCS
  37. Using big power tubes as buffer?
  38. Reason for tube converter
  39. Valve Mosfet Hybrids: a solution
  40. Protecting Plitron OPT
  41. DHT line stage 26, 01a or 101d
  42. Tube manufacturers
  43. Pinnacle Datasheets
  44. Tube preamp
  45. Can I use 1.1 instead of .47
  46. Project: Add a DAC to Pete Millett's low voltage hybrid tube amp
  47. Speakers for S5 K-16LS Kit
  48. Inexpensive B+ Batteries
  49. Leak Stereo 20 Capacitor Replacement Question
  50. Dynaco Mark IV exploding bias filter capacitor
  51. Anyone familiar with the Raphaelite sinovt 2a3-845
  52. Building monoblocks, go Dynaco MKIII or.....?
  53. Priboi (Surf :d) output transformer possible problem
  54. replacing ECC83 with ECC82 in stereo amp
  55. Counterpoint SA-5000 FET Buffer
  56. C3M 300B SET build, input appreciated.
  57. K12G Quiet Channel
  58. Weird "holes" in getter
  59. Radiotron A530 6J7G-6V6G-2A3 PP Amp
  60. Tube Identification
  61. Can i sub a 50K for a 100K volume control?
  62. Are the 12B4 and 12b4A interchangable?
  63. SE or PSE amplifier with 6N6P driving the 300B tube
  64. About 300B SE heater w/t Coleman regulator
  65. Should my TVC x formers be input or output
  66. Preamp Chassis Layout Advice
  67. Russian Audio Tubes
  68. SE UL EL 300 / ECC 83
  69. Grid Chokes
  70. Pot for project test
  71. Interpreting "Horizontal Osc. Service"
  72. My Take on a DIY Valve tester
  73. 6Н6П vs 6Н6П-И (gold grid etc claims ? )
  74. GU 19 VS GU 19-1 What's the difference ?
  75. please advice 1K Vdc power supply
  76. Has anyone used an opamp to split phase for a tube amp?
  77. Advice for budget valve amplifier
  78. S-5 Electronoics K-12M amplifier: lack of plate to grid coupling caps
  79. Eico ST70 needs a preamp output....
  80. Damper diode slow start
  81. KT150 SE based on Mikael's KT88 Schematic
  82. Octal driver tube choice
  83. Anyone ever clone a Audionote P1 SE
  84. Bogen DB212 phase-inverter
  85. EAR 869
  86. # triode 31 line pre amp
  87. Choosing The Iron For A SE OPT?
  88. Swap EL34 with 6L6 or 6V6
  89. Bridgeable floating output transformer help
  90. tapedeck playback amplifier
  91. Design based on the Output Transformer
  92. UL Push-Pull Tube Amp (mono combo)
  93. Power transformer for SET: toroid vs EI core
  94. Tektronix 547 Oscilloscope reserection
  95. can I use 12v to run 6C33C tubes???
  96. How to understand the data sheet for this 'universal' SE output transformer?
  97. DIY Stereo Amp
  98. el84 and 6aw8a
  99. Tube amp reboot Re: Chinese 6P6P (6V6) Push-Pull Tube Amplifier Kit
  100. 2A3 driver
  101. Tube Phono Preamps
  102. Newbie. Balanced 2A3 SE amplifier information
  103. Tube rectifier supply help
  104. cathode follower - please check my circuit
  105. Output tube stage 1578 for no DAC
  106. Bias for 300B
  107. Pots value in tube equalizer
  108. 'Real world' max plate voltages for 6DJ8, 6P15P?
  109. Lower load resistance for lower distortion (6L6 PP)
  110. Transformer Hum.
  111. Hmmmm Star ground
  112. Updating a HeathKit IT-11 capacitor checker
  113. Taylor T20 triode - anyone used these?
  114. Filament DC power supply for 2 valves
  115. Tubes availability
  116. Tube power amp bad fit for ML?
  117. SLA Battery (Filament Supply) DC Reference limits?
  118. Citation I, Citation II, and another Citation I
  119. tube amp damping / weird bass response, speaker movement
  120. Convert valve output stage to pre amp
  121. 6HJ5 SET
  122. A different type of EL84 SE
  123. Transformer covers; steel or aly?
  124. Triplett 3444A tube chart
  125. polyester or polypropylene or other??
  126. Opinions on SET transformers for 307a amp
  127. Strange experience with Dynaco ST70 input tubes
  128. Need advice regarding SET 45 Amplifier
  129. "Low" B+ Voltage Amplifiers
  130. Small power all russian tubes single ended amp
  131. Noob question on triode
  132. Good capacitors for tight space
  133. Can I mount Plate chokes next to OPTs???
  134. R-3389A Schematic?
  135. tube baxandall tone control potentiometer resistance value
  136. Can you help me identify these burned resistors?
  137. Do i have a problem with my DC filaments?
  138. Recommendations please. Octal sockets.
  139. metal can capacitors
  140. Dynaco Mark IV selenium rectifier replacement
  141. Elekit 8200 Tube rolling
  142. Girlfriend Wants to Build One
  143. Moskido Hybrid Aikido-MOSFET Amplifier
  144. Modified ST70 with extra tube sockets?!?!
  145. Wanted: ExpressPCB component layout for 7 pin socket
  146. Eliminating balance controls on Eico st70
  147. APPJ PA0901A anyone?
  148. 90wpc from push pull KT88?
  149. Help guessing amplifier model
  150. unusual SET amp design, your thoughts please
  151. Siemens e83cc Long plate triple mica?
  152. Help identafying 2 Output Transoromers?
  153. Tube Rectified Power Supplies
  154. Audio Nirvana 300B SET amp.
  155. Plotting plate curves past dissipation limit
  156. Massive Old Console... Repair or gut and replace with modern stuff?
  157. Tap Cap?
  158. OLD vs NEW tube amplifier circuits
  159. Who Made These Amps.
  160. An Amp oddity
  161. Linyun 300B Luxury edition
  162. Can plate chokes be THAT different?
  163. Pye HF25 Tube Monoblocks: Restoring Legends
  164. Millett Hybrid headphone amp.
  165. 6n2p-ev
  166. Idea for driver for CF output stage
  167. Problem with KT88 Williamson LTSpice simulation
  168. voltage regulator tubes
  169. Input impedance of grounded grid stage?
  170. tube upgrade benefits , worth the money ? 6R3S-1 , EF86
  171. Riaa MM high gain, low impedance.
  172. increase live 211 tube
  173. Need help with OPT for Loewe Opta Apollo Stereo
  174. Potentiometer & Power Switch Help
  175. Audio Note M2 Riaa.
  176. Is it the end of Blackburn Microtech tubes?
  177. Please critique my PSU design
  178. Audio Novice
  179. What vintage gear to source for tubes and transformers?
  180. 6n6p source
  181. (2) 6AV6 instead of 12ax7
  182. Preamp mod with tone control - comment please
  183. Roland branded 12AX7 tube?
  184. Questions about updates/upgrades
  185. When doubling output-tubes: What needs to be considered ?
  186. Audio Research SP-10 help needed
  187. Safety Tip For The Day
  188. PSU Output: Tubecad PS-1 Question
  189. Micro Channel Plate (MCP) audio amplifier
  190. bell mod 2445
  191. found a vintage dynacord concert el84 amp
  192. Stability problems, help please?
  193. Do I NEED to bring up an old amp on veriac?
  194. 6P15 / EL84 Sort of Para-Feed, Cathode-Drive, Hybrid
  195. Crosstalk L-R. Acceptable levels?
  196. Electronic diagramming tools with power and output transformer symbols
  197. Yaqin MS MC - 30L Amp
  198. www.pimmlabs.com not available
  199. vibration resistant preamp tube
  200. Direct Heated Valve in Series - Channel Separation Question
  201. So i was going into Tosche Station to pick up some power converters . . .
  202. a sub crossover idea
  203. Understanding power supply
  204. 12AX7 Class 2 (Positive Grid Voltage) Operation
  205. Edcor transformers TubeLab SPP
  206. All triode 250 watt western electric
  207. Telefunken EL34 data sheet
  208. Using a 6J1 tube amp as a final stage?
  209. Anyone use 872-A Mercury Vapor Rectifier Tube
  210. Need recapping tube radio advice
  211. Russian Capacitors
  212. Thinking about getting Philco model 14
  213. Mixed Bias for an EL34 ? Any recommendations / experience ?
  214. PP oscillation with toroid output transformer
  215. 6B4G New Amp Build Issue
  216. Mable Audio 300B Amp KitI
  217. Help me understand - 7061 vs. 12ab5 (and the rest of the 6V6 family)
  218. ebay seller jellyfishaudio
  219. DIY Tubelab SSE build keeps blowing fuses when turned on.
  220. 866a rectifier on 6.3vct@10A
  221. Vintage tube preamp design
  222. Output Transformer Wiring
  223. Ground loop problems
  224. Reversed preamp OPT as IPT
  225. A2 p-p with Millett driver
  226. DC filament supply schematic
  227. Mystery tube
  228. 6eu7/6bq5 feedback question
  229. Ultimate Ultralinear Amp...please help to understand...
  230. Mullard 20 Watt Amp
  231. Transformer feedback winding: Tamura HN-1
  232. the big one
  233. ECC33 vs 6SN7 - Implications I should know?
  234. What is a Source Measure unit (SMU)?
  235. Building a tube amp from scratch
  236. Priboj (priboi) 50, small problem (SOVIET TUBE AMP)
  237. Kellogg (Dukane?) Tube PA Amp
  238. APPJ PA1501
  239. New production 6L6GC tubes and similar
  240. Knight 10W 6V6 push-pull tube power amp
  241. 480vct at 50VA for less than $12 shipped
  242. Pioneer SA-81 integrated tube amp
  243. 12B4 Preamp Design/Pre-build Questions
  244. Can I mount a 5R4WGA at a 10 degree angle?
  245. plate current variation with fixed bias
  246. 5693 issue
  247. SPP amp build from TubeLab
  248. "mustard" Philips Mullard capacitors
  249. Hum SOLVED!!!!
  250. Garage System Control/Preamp idea

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