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  1. Thinking Outside the Box - A Different Kind of Triode Audio Amplifier
  2. Amp Circuits Tutorial
  3. Push pull ecl86 stereo amp
  4. Using a CCS for bias.
  5. Using Telefunken EL-156 in Dynaco Mark III amp
  6. preamplifier with POSITIVE bootstrap feedback
  7. Low Voltage Aikido questions
  8. I had an idea for a SE UL amp with local feedback output stage
  9. Woolgathering
  10. all dht system?
  11. Question - Labeling Tested Tubes
  12. Filament bias impedance.
  13. Tube amp inactivity auto-off
  14. High gm version of 12AU7
  15. Need help on B+ output
  16. Tube substitute
  17. DIY SRPP ecc82
  18. Schematic needed for circa 1985 tube preamp kit
  19. Ultra-Linear Midget Amp ?
  20. Why do cathode followers have 100% feedback?
  21. 12AX7 + 12AU7 preamp with feedback?
  22. Counterpoint SA 3000 Transformer
  23. EL 84 in triode
  24. Pictures of your socket dampers (shock mounts) installed!
  25. Amperex bugle boy help
  26. Can I use a PP interstage for SE?
  27. Classic 4 valve PPP circuits
  28. Ultra linear OT PP 30W/25W for SE amp of low power? Safe?
  29. 12v/24v RIAA MM preamp
  30. Schiit LISST SS tubes?
  31. Feline Futterman OTL Amp
  32. CatSkin Class A2 SET with Secondary Flux Cancellation
  33. How to wire a 4pin base to 5 pin top tube socket adapter
  34. Coupling cap spec
  35. Bought 6AS5, got 6AS6 instead. Any audio use?
  36. Help verifying EF86
  37. Quad II power transformer
  38. KT88 Mutual Conductance Test
  39. 4P1L worth stocking up?
  40. Help Identifying A Valve Amplifier
  41. Sonic Frontiers Power 3 Help Needed
  42. Re-build of my first OTL from 2000
  43. Help with choosing substitute output transformer??
  44. Last stop before the end of the road !
  45. Output Transformer insertion/power losses
  46. OTL, not OTL, & Matching VS Loading transformers
  47. Out with the MJ in with the Aikido
  48. What can I use parts for?
  49. Can someone help me understand this topology?
  50. Looking for PP design when I already have the OPTs
  51. New project, Damn Good 300B amp.
  52. medium power (~20W) amplifier and power supply requirements
  53. ID this Dynaco ST-70 board
  54. SRPP with different brand of tubes ?
  55. Best tube amp clone for stereo music
  56. RCA receivers / amps
  57. Triode PP design questions - where to add gain?
  58. Push Pull Tube Amplifier with CCS
  59. McIntosh MC275 problem.
  60. converting pentode data to triode-strapped? The 1609 pentode?
  61. Moscode 300 Manual/schematic
  62. Need help with new amp design
  63. 4699 SEP (unusual cathode feedback?)
  64. DH filament side matters?
  65. FU50 + 6N8P + 5Z3P Amplifier
  66. Collet wire connector for 300B socket?
  67. KT-88, KT-77, Russian 6SN7 makes "pops". Should I touch their pin with an iron?
  68. Low voltage Tubelab sse
  69. Tube Power Supply Question
  70. Would there be any harm using 10K OPT for 45 tubes?
  71. Restoring the first Pye HF25
  72. Jolida FX10 mods
  73. Help needed - DIY amp not working; first time powering up
  74. EL86: push-pull for home
  75. Input transformer question? Help identifying
  76. Anyone ever tried building the Feral Eye 2A3 PP?
  77. Schade Feedback In A Push Pull Differential Amplifier?
  78. PSA: new diy tubes sub on Reddit
  79. Hum/Buzz in a tube PP amp
  80. 300B+6GL7 SE stereo integrated amplifier
  81. Bias tap on b+ or separate winding?
  82. Arcturus No. 12 tube
  83. SainSmart 6N3 pre for Pass ACA
  84. Single ended MM tube phono amp
  85. 5U4G schematic for 4x6SN7 Stereo Octal Akido Preamp.
  86. ECL82 amp from old magnetophones
  87. Bogen MO100A with KT120 ??
  88. Someone sales out trafos Jensen transformers in europe?
  89. Book recommendation?
  90. Sanity check? HV supply for 125wpc sweep tube amp
  91. 6922 Technical info (help)
  92. How about this phono idea
  93. Scottkit trouble
  94. How to remove tube metalization
  95. Old Dynatron Information
  96. good driver tube with 150mA heater?
  97. Tell me what this is
  98. Switch between tubes with relay
  99. Need some help with my Palmer Eins
  100. A rare tube in my hands. Info please.
  101. Dealing with Heater Elevation/Ground Reference for aux circuit
  102. 6GK5 OR 6AH5 for phono head amp
  103. Parallel triodes: best connection?
  104. Which resistors to replace burned ones in Dared DV-300b monoblocks
  105. Unusual tube preamp, will it work?
  106. Eico HF-81 with Pre Out?
  107. volume control by pass power tube
  108. Single End Transfomers, The hysteresis loop and maximum current
  109. DC at output on startup
  110. Yet another ECC82/12AU7 Line Preamp
  111. Clarke and Smith EL84 Amp
  112. Are rectifier tubes still relevant? Why would you use one, or avoid using one?
  113. replace 5R4GA to WE 274B
  114. 6sl7 vs 6n9p vs 6n9s
  115. MAC bifilar output stage test proof
  116. Dummy load for bench testing tube pre.
  117. Brook 12A Mono blocks
  118. Maximum Ic before auto shutdown
  119. Octal Akido HP amp as pre amp
  120. loudspeaker series resistance question
  121. Which preamp a better match for low-volume listening?
  122. Balanced Signal, Phase Splitter in Push Pull topology
  123. Pin 4 Grid 2 Resistor
  124. Weird voltage w/ LM1084 regulators / #27 filaments
  125. My Audio Research SP-3-A1 Restoration and Questions Documentation
  126. Almarro a318B
  127. Bakelite and Car Brakefluid
  128. Chinese 6N2 / 6P1 schematics advice needed
  129. Operating point of GM70
  130. 50W 6L6 (6P7S) how to replace tube ccs for solid state?
  131. Star Grounding for a Line Stage Tube Preamp
  132. ID Kit Amp Help. K-12 Tube Amp or Similar?
  133. Are they still making Golden Dragon?
  134. About LL1660/18mA
  135. ST-120 tube set
  136. Newb seeks to drive DVC 4+4 ohm 500w RMS subwoofer with tubes.
  137. The 33 Amplifier
  138. Build Your Own Vacuum Tubes
  139. Can Anyone Tell Me What This Pot Does in AN Soro?
  140. Which high-voltage MOSFET for source follower?
  141. A Practical Circlotron You Can Build
  142. Noob questions
  143. JohnBlue TL66 Monoblocks hum problem. Help please
  144. ECL82 SE 1,8W
  145. RH slayer
  146. Cary SLP-90 preamp power supply
  147. phase splitter with low distortion
  148. First PSU Capacitor
  149. Chinese tubes
  150. SE class A2
  151. Dynaco MKIV 7199 driver circuit
  152. Someone out there....type of tube ?
  153. admiral 5t4a
  154. Pentode Screen Resistance (rs) Estimation Example
  155. Grounding linstage help
  156. What is this tube?
  157. Do 300b tube have a "guide pin"
  158. Effect of Weak Mains Power
  159. Croatian Triode Festival Zadar-2016
  160. Using dht self bias resistor to lift idht front end heater
  161. Philips EL6411/01 amplifier
  162. Quad II output transformer
  163. Mosfet or other semiconductor substitute for cathodyne?
  164. 6SN7 preamp tube alternative with less gain?
  165. Hagerman Cornet Octal planning help and build
  166. output transformer opposing windings/ please explain
  167. Preamp Transformer overheats
  168. Finishing ASC capacitors
  169. Can't identify this tube?
  170. 6SN7 pin 4 signal input
  171. Help - Tube PSU Design
  172. Little help for a newbie?
  173. Has anyone built this phono stage you can buy on ebay as a circuit board.
  174. pl504 Vacuum tube
  175. Tubes in the Unballancer
  176. Quad II Amplifier KT66 Valves/Tubes and Carbon Composition Resistors
  177. ecc88 preamp
  178. Tube socket center post
  179. Troubleshooting bias of old diy amp with Acrosound TO-300 transformer
  180. Dynaco Mark III with noisy transformer, making hum.
  181. Power amplifier EL 34
  182. Replace 6SN7 to E88CC on HP amp 90VDC plate capable?
  183. 1p24b Russian tube
  184. Tube power supply
  185. Tube-O-Philes, Please help with this chassis search
  186. WOW, I want one !!!
  187. B&K dyna-quick 550
  188. What is this? Valve Amp?
  189. CCS instead of a resistor in the cathode of a cathode follower?
  190. Please comment on D3a tube testing
  191. ID tube amp kit 8 watts stereo.. unsure what tubes to use
  192. Mixed bias for 6336a or 6AS7 output tubes?
  193. Vintage Tube Amp kit - Can it be refurbished?
  194. Any experience or opinion about 300B/EL34 Chinese DIY Kit ...
  195. Measuring "high impedance voltage" with digital multimeter
  196. SE (UL ?) HI FI project needs help
  197. Can anyone verify this math? MC 2205 Watt Scale
  198. Generic design question for Pentode CCS
  199. Using big power tubes as buffer?
  200. Reason for tube converter
  201. Valve Mosfet Hybrids: a solution
  202. Protecting Plitron OPT
  203. DHT line stage 26, 01a or 101d
  204. Tube manufacturers
  205. Pinnacle Datasheets
  206. Tube preamp
  207. Can I use 1.1 instead of .47
  208. Project: Add a DAC to Pete Millett's low voltage hybrid tube amp
  209. Speakers for S5 K-16LS Kit
  210. Inexpensive B+ Batteries
  211. Leak Stereo 20 Capacitor Replacement Question
  212. Dynaco Mark IV exploding bias filter capacitor
  213. Anyone familiar with the Raphaelite sinovt 2a3-845
  214. Building monoblocks, go Dynaco MKIII or.....?
  215. Priboi (Surf :d) output transformer possible problem
  216. replacing ECC83 with ECC82 in stereo amp
  217. Counterpoint SA-5000 FET Buffer
  218. C3M 300B SET build, input appreciated.
  219. K12G Quiet Channel
  220. Weird "holes" in getter
  221. Radiotron A530 6J7G-6V6G-2A3 PP Amp
  222. Tube Identification
  223. Can i sub a 50K for a 100K volume control?
  224. Are the 12B4 and 12b4A interchangable?
  225. SE or PSE amplifier with 6N6P driving the 300B tube
  226. About 300B SE heater w/t Coleman regulator
  227. Should my TVC x formers be input or output
  228. Preamp Chassis Layout Advice
  229. Russian Audio Tubes
  230. SE UL EL 300 / ECC 83
  231. Grid Chokes
  232. Pot for project test
  233. Interpreting "Horizontal Osc. Service"
  234. My Take on a DIY Valve tester
  235. 6Н6П vs 6Н6П-И (gold grid etc claims ? )
  236. GU 19 VS GU 19-1 What's the difference ?
  237. please advice 1K Vdc power supply
  238. Has anyone used an opamp to split phase for a tube amp?
  239. Advice for budget valve amplifier
  240. S-5 Electronoics K-12M amplifier: lack of plate to grid coupling caps
  241. Eico ST70 needs a preamp output....
  242. Damper diode slow start
  243. KT150 SE based on Mikael's KT88 Schematic
  244. Octal driver tube choice
  245. Anyone ever clone a Audionote P1 SE
  246. Bogen DB212 phase-inverter
  247. EAR 869
  248. # triode 31 line pre amp
  249. Choosing The Iron For A SE OPT?
  250. Swap EL34 with 6L6 or 6V6

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