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  1. Tube amp inactivity auto-off
  2. High gm version of 12AU7
  3. Need help on B+ output
  4. Tube substitute
  5. DIY SRPP ecc82
  6. Schematic needed for circa 1985 tube preamp kit
  7. Ultra-Linear Midget Amp ?
  8. 12AX7 + 12AU7 preamp with feedback?
  9. Counterpoint SA 3000 Transformer
  10. EL 84 in triode
  11. Pictures of your socket dampers (shock mounts) installed!
  12. Amperex bugle boy help
  13. Can I use a PP interstage for SE?
  14. Classic 4 valve PPP circuits
  15. Ultra linear OT PP 30W/25W for SE amp of low power? Safe?
  16. 12v/24v RIAA MM preamp
  17. Schiit LISST SS tubes?
  18. Feline Futterman OTL Amp
  19. CatSkin Class A2 SET with Secondary Flux Cancellation
  20. How to wire a 4pin base to 5 pin top tube socket adapter
  21. Coupling cap spec
  22. Bought 6AS5, got 6AS6 instead. Any audio use?
  23. Help verifying EF86
  24. Quad II power transformer
  25. KT88 Mutual Conductance Test
  26. Help Identifying A Valve Amplifier
  27. Sonic Frontiers Power 3 Help Needed
  28. Re-build of my first OTL from 2000
  29. Help with choosing substitute output transformer??
  30. Last stop before the end of the road !
  31. Output Transformer insertion/power losses
  32. OTL, not OTL, & Matching VS Loading transformers
  33. Out with the MJ in with the Aikido
  34. What can I use parts for?
  35. Can someone help me understand this topology?
  36. Looking for PP design when I already have the OPTs
  37. New project, Damn Good 300B amp.
  38. medium power (~20W) amplifier and power supply requirements
  39. ID this Dynaco ST-70 board
  40. SRPP with different brand of tubes ?
  41. Best tube amp clone for stereo music
  42. RCA receivers / amps
  43. Triode PP design questions - where to add gain?
  44. Push Pull Tube Amplifier with CCS
  45. McIntosh MC275 problem.
  46. converting pentode data to triode-strapped? The 1609 pentode?
  47. Moscode 300 Manual/schematic
  48. Need help with new amp design
  49. 4699 SEP (unusual cathode feedback?)
  50. DH filament side matters?
  51. FU50 + 6N8P + 5Z3P Amplifier
  52. Collet wire connector for 300B socket?
  53. KT-88, KT-77, Russian 6SN7 makes "pops". Should I touch their pin with an iron?
  54. Tube Power Supply Question
  55. Would there be any harm using 10K OPT for 45 tubes?
  56. Restoring the first Pye HF25
  57. Jolida FX10 mods
  58. Help needed - DIY amp not working; first time powering up
  59. EL86: push-pull for home
  60. Input transformer question? Help identifying
  61. Anyone ever tried building the Feral Eye 2A3 PP?
  62. Schade Feedback In A Push Pull Differential Amplifier?
  63. PSA: new diy tubes sub on Reddit
  64. Hum/Buzz in a tube PP amp
  65. 300B+6GL7 SE stereo integrated amplifier
  66. Bias tap on b+ or separate winding?
  67. Arcturus No. 12 tube
  68. SainSmart 6N3 pre for Pass ACA
  69. Single ended MM tube phono amp
  70. 5U4G schematic for 4x6SN7 Stereo Octal Akido Preamp.
  71. ECL82 amp from old magnetophones
  72. Bogen MO100A with KT120 ??
  73. Someone sales out trafos Jensen transformers in europe?
  74. Book recommendation?
  75. Sanity check? HV supply for 125wpc sweep tube amp
  76. 6922 Technical info (help)
  77. How about this phono idea
  78. Scottkit trouble
  79. How to remove tube metalization
  80. Old Dynatron Information
  81. good driver tube with 150mA heater?
  82. Tell me what this is
  83. Switch between tubes with relay
  84. Need some help with my Palmer Eins
  85. A rare tube in my hands. Info please.
  86. Dealing with Heater Elevation/Ground Reference for aux circuit
  87. 6GK5 OR 6AH5 for phono head amp
  88. Parallel triodes: best connection?
  89. Which resistors to replace burned ones in Dared DV-300b monoblocks
  90. Unusual tube preamp, will it work?
  91. Eico HF-81 with Pre Out?
  92. volume control by pass power tube
  93. Single End Transfomers, The hysteresis loop and maximum current
  94. DC at output on startup
  95. Yet another ECC82/12AU7 Line Preamp
  96. Clarke and Smith EL84 Amp
  97. Are rectifier tubes still relevant? Why would you use one, or avoid using one?
  98. replace 5R4GA to WE 274B
  99. 6sl7 vs 6n9p vs 6n9s
  100. MAC bifilar output stage test proof
  101. Dummy load for bench testing tube pre.
  102. Brook 12A Mono blocks
  103. Maximum Ic before auto shutdown
  104. Octal Akido HP amp as pre amp
  105. loudspeaker series resistance question
  106. Which preamp a better match for low-volume listening?
  107. Balanced Signal, Phase Splitter in Push Pull topology
  108. Pin 4 Grid 2 Resistor
  109. Weird voltage w/ LM1084 regulators / #27 filaments
  110. My Audio Research SP-3-A1 Restoration and Questions Documentation
  111. Almarro a318B
  112. Bakelite and Car Brakefluid
  113. Chinese 6N2 / 6P1 schematics advice needed
  114. Operating point of GM70
  115. 50W 6L6 (6P7S) how to replace tube ccs for solid state?
  116. Star Grounding for a Line Stage Tube Preamp
  117. ID Kit Amp Help. K-12 Tube Amp or Similar?
  118. Are they still making Golden Dragon?
  119. About LL1660/18mA
  120. ST-120 tube set
  121. Newb seeks to drive DVC 4+4 ohm 500w RMS subwoofer with tubes.
  122. The 33 Amplifier
  123. Build Your Own Vacuum Tubes
  124. Can Anyone Tell Me What This Pot Does in AN Soro?
  125. Which high-voltage MOSFET for source follower?
  126. A Practical Circlotron You Can Build
  127. Noob questions
  128. JohnBlue TL66 Monoblocks hum problem. Help please
  129. ECL82 SE 1,8W
  130. RH slayer
  131. Cary SLP-90 preamp power supply
  132. phase splitter with low distortion
  133. First PSU Capacitor
  134. Chinese tubes
  135. SE class A2
  136. Dynaco MKIV 7199 driver circuit
  137. Someone out there....type of tube ?
  138. admiral 5t4a
  139. Pentode Screen Resistance (rs) Estimation Example
  140. Grounding linstage help
  141. What is this tube?
  142. Do 300b tube have a "guide pin"
  143. Effect of Weak Mains Power
  144. Using dht self bias resistor to lift idht front end heater
  145. Philips EL6411/01 amplifier
  146. Quad II output transformer
  147. Mosfet or other semiconductor substitute for cathodyne?
  148. 6SN7 preamp tube alternative with less gain?
  149. Hagerman Cornet Octal planning help and build
  150. output transformer opposing windings/ please explain
  151. Preamp Transformer overheats
  152. Can't identify this tube?
  153. 6SN7 pin 4 signal input
  154. Help - Tube PSU Design
  155. Little help for a newbie?
  156. Has anyone built this phono stage you can buy on ebay as a circuit board.
  157. pl504 Vacuum tube
  158. Tubes in the Unballancer
  159. Quad II Amplifier KT66 Valves/Tubes and Carbon Composition Resistors
  160. ecc88 preamp
  161. Tube socket center post
  162. Troubleshooting bias of old diy amp with Acrosound TO-300 transformer
  163. Dynaco Mark III with noisy transformer, making hum.
  164. Power amplifier EL 34
  165. Replace 6SN7 to E88CC on HP amp 90VDC plate capable?
  166. 1p24b Russian tube
  167. Tube power supply
  168. Tube-O-Philes, Please help with this chassis search
  169. WOW, I want one !!!
  170. What is this? Valve Amp?
  171. CCS instead of a resistor in the cathode of a cathode follower?
  172. Please comment on D3a tube testing
  173. ID tube amp kit 8 watts stereo.. unsure what tubes to use
  174. Mixed bias for 6336a or 6AS7 output tubes?
  175. Vintage Tube Amp kit - Can it be refurbished?
  176. Any experience or opinion about 300B/EL34 Chinese DIY Kit ...
  177. SE (UL ?) HI FI project needs help
  178. Can anyone verify this math? MC 2205 Watt Scale
  179. Generic design question for Pentode CCS
  180. Using big power tubes as buffer?
  181. Reason for tube converter
  182. Valve Mosfet Hybrids: a solution
  183. Protecting Plitron OPT
  184. DHT line stage 26, 01a or 101d
  185. Tube manufacturers
  186. Pinnacle Datasheets
  187. Tube preamp
  188. Can I use 1.1 instead of .47
  189. Project: Add a DAC to Pete Millett's low voltage hybrid tube amp
  190. Speakers for S5 K-16LS Kit
  191. Inexpensive B+ Batteries
  192. Leak Stereo 20 Capacitor Replacement Question
  193. Dynaco Mark IV exploding bias filter capacitor
  194. Anyone familiar with the Raphaelite sinovt 2a3-845
  195. Building monoblocks, go Dynaco MKIII or.....?
  196. Priboi (Surf :d) output transformer possible problem
  197. replacing ECC83 with ECC82 in stereo amp
  198. Counterpoint SA-5000 FET Buffer
  199. C3M 300B SET build, input appreciated.
  200. K12G Quiet Channel
  201. Weird "holes" in getter
  202. Radiotron A530 6J7G-6V6G-2A3 PP Amp
  203. Tube Identification
  204. Can i sub a 50K for a 100K volume control?
  205. Are the 12B4 and 12b4A interchangable?
  206. SE or PSE amplifier with 6N6P driving the 300B tube
  207. About 300B SE heater w/t Coleman regulator
  208. Should my TVC x formers be input or output
  209. Preamp Chassis Layout Advice
  210. Russian Audio Tubes
  211. SE UL EL 300 / ECC 83
  212. Grid Chokes
  213. Pot for project test
  214. Interpreting "Horizontal Osc. Service"
  215. My Take on a DIY Valve tester
  216. 6Н6П vs 6Н6П-И (gold grid etc claims ? )
  217. GU 19 VS GU 19-1 What's the difference ?
  218. please advice 1K Vdc power supply
  219. Has anyone used an opamp to split phase for a tube amp?
  220. Advice for budget valve amplifier
  221. S-5 Electronoics K-12M amplifier: lack of plate to grid coupling caps
  222. Eico ST70 needs a preamp output....
  223. Damper diode slow start
  224. KT150 SE based on Mikael's KT88 Schematic
  225. Octal driver tube choice
  226. Anyone ever clone a Audionote P1 SE
  227. Bogen DB212 phase-inverter
  228. EAR 869
  229. # triode 31 line pre amp
  230. Choosing The Iron For A SE OPT?
  231. Swap EL34 with 6L6 or 6V6
  232. Bridgeable floating output transformer help
  233. tapedeck playback amplifier
  234. Design based on the Output Transformer
  235. UL Push-Pull Tube Amp (mono combo)
  236. Power transformer for SET: toroid vs EI core
  237. can I use 12v to run 6C33C tubes???
  238. How to understand the data sheet for this 'universal' SE output transformer?
  239. DIY Stereo Amp
  240. el84 and 6aw8a
  241. Tube amp reboot Re: Chinese 6P6P (6V6) Push-Pull Tube Amplifier Kit
  242. 2A3 driver
  243. Tube Phono Preamps
  244. Newbie. Balanced 2A3 SE amplifier information
  245. Tube rectifier supply help
  246. cathode follower - please check my circuit
  247. Output tube stage 1578 for no DAC
  248. Bias for 300B
  249. Pots value in tube equalizer
  250. 'Real world' max plate voltages for 6DJ8, 6P15P?

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