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  1. Tube Power Supply Question
  2. Would there be any harm using 10K OPT for 45 tubes?
  3. Restoring the first Pye HF25
  4. Jolida FX10 mods
  5. Help needed - DIY amp not working; first time powering up
  6. EL86: push-pull for home
  7. Input transformer question? Help identifying
  8. Anyone ever tried building the Feral Eye 2A3 PP?
  9. Schade Feedback In A Push Pull Differential Amplifier?
  10. PSA: new diy tubes sub on Reddit
  11. Hum/Buzz in a tube PP amp
  12. 300B+6GL7 SE stereo integrated amplifier
  13. Bias tap on b+ or separate winding?
  14. Arcturus No. 12 tube
  15. SainSmart 6N3 pre for Pass ACA
  16. Single ended MM tube phono amp
  17. 5U4G schematic for 4x6SN7 Stereo Octal Akido Preamp.
  18. ECL82 amp from old magnetophones
  19. Bogen MO100A with KT120 ??
  20. Someone sales out trafos Jensen transformers in europe?
  21. Book recommendation?
  22. Sanity check? HV supply for 125wpc sweep tube amp
  23. 6922 Technical info (help)
  24. How about this phono idea
  25. Scottkit trouble
  26. How to remove tube metalization
  27. Old Dynatron Information
  28. good driver tube with 150mA heater?
  29. Tell me what this is
  30. Switch between tubes with relay
  31. Need some help with my Palmer Eins
  32. A rare tube in my hands. Info please.
  33. Dealing with Heater Elevation/Ground Reference for aux circuit
  34. 6GK5 OR 6AH5 for phono head amp
  35. Parallel triodes: best connection?
  36. Which resistors to replace burned ones in Dared DV-300b monoblocks
  37. Unusual tube preamp, will it work?
  38. Eico HF-81 with Pre Out?
  39. volume control by pass power tube
  40. Single End Transfomers, The hysteresis loop and maximum current
  41. DC at output on startup
  42. Yet another ECC82/12AU7 Line Preamp
  43. Clarke and Smith EL84 Amp
  44. Are rectifier tubes still relevant? Why would you use one, or avoid using one?
  45. replace 5R4GA to WE 274B
  46. 6sl7 vs 6n9p vs 6n9s
  47. MAC bifilar output stage test proof
  48. Dummy load for bench testing tube pre.
  49. Brook 12A Mono blocks
  50. Maximum Ic before auto shutdown
  51. Octal Akido HP amp as pre amp
  52. loudspeaker series resistance question
  53. Which preamp a better match for low-volume listening?
  54. Balanced Signal, Phase Splitter in Push Pull topology
  55. Pin 4 Grid 2 Resistor
  56. Weird voltage w/ LM1084 regulators / #27 filaments
  57. My Audio Research SP-3-A1 Restoration and Questions Documentation
  58. Almarro a318B
  59. Bakelite and Car Brakefluid
  60. Chinese 6N2 / 6P1 schematics advice needed
  61. Operating point of GM70
  62. 50W 6L6 (6P7S) how to replace tube ccs for solid state?
  63. Star Grounding for a Line Stage Tube Preamp
  64. ID Kit Amp Help. K-12 Tube Amp or Similar?
  65. Are they still making Golden Dragon?
  66. About LL1660/18mA
  67. ST-120 tube set
  68. Newb seeks to drive DVC 4+4 ohm 500w RMS subwoofer with tubes.
  69. The 33 Amplifier
  70. Build Your Own Vacuum Tubes
  71. Can Anyone Tell Me What This Pot Does in AN Soro?
  72. Which high-voltage MOSFET for source follower?
  73. A Practical Circlotron You Can Build
  74. Noob questions
  75. JohnBlue TL66 Monoblocks hum problem. Help please
  76. ECL82 SE 1,8W
  77. RH slayer
  78. Cary SLP-90 preamp power supply
  79. phase splitter with low distortion
  80. First PSU Capacitor
  81. Chinese tubes
  82. SE class A2
  83. Dynaco MKIV 7199 driver circuit
  84. Someone out there....type of tube ?
  85. admiral 5t4a
  86. Pentode Screen Resistance (rs) Estimation Example
  87. Grounding linstage help
  88. What is this tube?
  89. Do 300b tube have a "guide pin"
  90. Effect of Weak Mains Power
  91. Croatian Triode Festival Zadar-2016
  92. Using dht self bias resistor to lift idht front end heater
  93. Philips EL6411/01 amplifier
  94. Quad II output transformer
  95. Mosfet or other semiconductor substitute for cathodyne?
  96. 6SN7 preamp tube alternative with less gain?
  97. Hagerman Cornet Octal planning help and build
  98. output transformer opposing windings/ please explain
  99. Preamp Transformer overheats
  100. Finishing ASC capacitors
  101. Can't identify this tube?
  102. 6SN7 pin 4 signal input
  103. Help - Tube PSU Design
  104. Little help for a newbie?
  105. Has anyone built this phono stage you can buy on ebay as a circuit board.
  106. pl504 Vacuum tube
  107. Tubes in the Unballancer
  108. Quad II Amplifier KT66 Valves/Tubes and Carbon Composition Resistors
  109. ecc88 preamp
  110. Tube socket center post
  111. Troubleshooting bias of old diy amp with Acrosound TO-300 transformer
  112. Dynaco Mark III with noisy transformer, making hum.
  113. Power amplifier EL 34
  114. Replace 6SN7 to E88CC on HP amp 90VDC plate capable?
  115. 1p24b Russian tube
  116. Tube power supply
  117. Tube-O-Philes, Please help with this chassis search
  118. WOW, I want one !!!
  119. B&K dyna-quick 550
  120. What is this? Valve Amp?
  121. CCS instead of a resistor in the cathode of a cathode follower?
  122. Please comment on D3a tube testing
  123. ID tube amp kit 8 watts stereo.. unsure what tubes to use
  124. Mixed bias for 6336a or 6AS7 output tubes?
  125. Vintage Tube Amp kit - Can it be refurbished?
  126. Any experience or opinion about 300B/EL34 Chinese DIY Kit ...
  127. Measuring "high impedance voltage" with digital multimeter
  128. SE (UL ?) HI FI project needs help
  129. Can anyone verify this math? MC 2205 Watt Scale
  130. Generic design question for Pentode CCS
  131. Using big power tubes as buffer?
  132. Reason for tube converter
  133. Valve Mosfet Hybrids: a solution
  134. Protecting Plitron OPT
  135. DHT line stage 26, 01a or 101d
  136. Tube manufacturers
  137. Pinnacle Datasheets
  138. Tube preamp
  139. Can I use 1.1 instead of .47
  140. Project: Add a DAC to Pete Millett's low voltage hybrid tube amp
  141. Speakers for S5 K-16LS Kit
  142. Inexpensive B+ Batteries
  143. Leak Stereo 20 Capacitor Replacement Question
  144. Dynaco Mark IV exploding bias filter capacitor
  145. Anyone familiar with the Raphaelite sinovt 2a3-845
  146. Building monoblocks, go Dynaco MKIII or.....?
  147. Priboi (Surf :d) output transformer possible problem
  148. replacing ECC83 with ECC82 in stereo amp
  149. Counterpoint SA-5000 FET Buffer
  150. C3M 300B SET build, input appreciated.
  151. K12G Quiet Channel
  152. Weird "holes" in getter
  153. Radiotron A530 6J7G-6V6G-2A3 PP Amp
  154. Tube Identification
  155. Can i sub a 50K for a 100K volume control?
  156. Are the 12B4 and 12b4A interchangable?
  157. SE or PSE amplifier with 6N6P driving the 300B tube
  158. About 300B SE heater w/t Coleman regulator
  159. Should my TVC x formers be input or output
  160. Preamp Chassis Layout Advice
  161. Russian Audio Tubes
  162. SE UL EL 300 / ECC 83
  163. Grid Chokes
  164. Pot for project test
  165. Interpreting "Horizontal Osc. Service"
  166. My Take on a DIY Valve tester
  167. 6Н6П vs 6Н6П-И (gold grid etc claims ? )
  168. GU 19 VS GU 19-1 What's the difference ?
  169. please advice 1K Vdc power supply
  170. Has anyone used an opamp to split phase for a tube amp?
  171. Advice for budget valve amplifier
  172. S-5 Electronoics K-12M amplifier: lack of plate to grid coupling caps
  173. Eico ST70 needs a preamp output....
  174. Damper diode slow start
  175. KT150 SE based on Mikael's KT88 Schematic
  176. Octal driver tube choice
  177. Anyone ever clone a Audionote P1 SE
  178. Bogen DB212 phase-inverter
  179. EAR 869
  180. # triode 31 line pre amp
  181. Choosing The Iron For A SE OPT?
  182. Swap EL34 with 6L6 or 6V6
  183. Bridgeable floating output transformer help
  184. tapedeck playback amplifier
  185. Design based on the Output Transformer
  186. UL Push-Pull Tube Amp (mono combo)
  187. Power transformer for SET: toroid vs EI core
  188. Tektronix 547 Oscilloscope reserection
  189. can I use 12v to run 6C33C tubes???
  190. How to understand the data sheet for this 'universal' SE output transformer?
  191. DIY Stereo Amp
  192. el84 and 6aw8a
  193. Tube amp reboot Re: Chinese 6P6P (6V6) Push-Pull Tube Amplifier Kit
  194. 2A3 driver
  195. Tube Phono Preamps
  196. Newbie. Balanced 2A3 SE amplifier information
  197. Tube rectifier supply help
  198. cathode follower - please check my circuit
  199. Output tube stage 1578 for no DAC
  200. Bias for 300B
  201. Pots value in tube equalizer
  202. 'Real world' max plate voltages for 6DJ8, 6P15P?
  203. Lower load resistance for lower distortion (6L6 PP)
  204. Transformer Hum.
  205. Hmmmm Star ground
  206. Updating a HeathKit IT-11 capacitor checker
  207. Taylor T20 triode - anyone used these?
  208. Filament DC power supply for 2 valves
  209. Tubes availability
  210. Tube power amp bad fit for ML?
  211. SLA Battery (Filament Supply) DC Reference limits?
  212. Citation I, Citation II, and another Citation I
  213. tube amp damping / weird bass response, speaker movement
  214. Convert valve output stage to pre amp
  215. 6HJ5 SET
  216. A different type of EL84 SE
  217. Transformer covers; steel or aly?
  218. Triplett 3444A tube chart
  219. polyester or polypropylene or other??
  220. Opinions on SET transformers for 307a amp
  221. Strange experience with Dynaco ST70 input tubes
  222. Need advice regarding SET 45 Amplifier
  223. "Low" B+ Voltage Amplifiers
  224. Small power all russian tubes single ended amp
  225. Noob question on triode
  226. Good capacitors for tight space
  227. Can I mount Plate chokes next to OPTs???
  228. R-3389A Schematic?
  229. tube baxandall tone control potentiometer resistance value
  230. Can you help me identify these burned resistors?
  231. Do i have a problem with my DC filaments?
  232. Recommendations please. Octal sockets.
  233. metal can capacitors
  234. Dynaco Mark IV selenium rectifier replacement
  235. Elekit 8200 Tube rolling
  236. Girlfriend Wants to Build One
  237. Moskido Hybrid Aikido-MOSFET Amplifier
  238. Modified ST70 with extra tube sockets?!?!
  239. Wanted: ExpressPCB component layout for 7 pin socket
  240. Eliminating balance controls on Eico st70
  241. APPJ PA0901A anyone?
  242. 90wpc from push pull KT88?
  243. Help guessing amplifier model
  244. unusual SET amp design, your thoughts please
  245. Siemens e83cc Long plate triple mica?
  246. Help identafying 2 Output Transoromers?
  247. Tube Rectified Power Supplies
  248. Audio Nirvana 300B SET amp.
  249. Plotting plate curves past dissipation limit
  250. Massive Old Console... Repair or gut and replace with modern stuff?

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