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  1. Amperex bugle boy help
  2. Can I use a PP interstage for SE?
  3. Classic 4 valve PPP circuits
  4. Ultra linear OT PP 30W/25W for SE amp of low power? Safe?
  5. 12v/24v RIAA MM preamp
  6. Schiit LISST SS tubes?
  7. Feline Futterman OTL Amp
  8. CatSkin Class A2 SET with Secondary Flux Cancellation
  9. How to wire a 4pin base to 5 pin top tube socket adapter
  10. Coupling cap spec
  11. Bought 6AS5, got 6AS6 instead. Any audio use?
  12. Help verifying EF86
  13. Quad II power transformer
  14. KT88 Mutual Conductance Test
  15. Help Identifying A Valve Amplifier
  16. Sonic Frontiers Power 3 Help Needed
  17. Re-build of my first OTL from 2000
  18. Help with choosing substitute output transformer??
  19. Last stop before the end of the road !
  20. Output Transformer insertion/power losses
  21. OTL, not OTL, & Matching VS Loading transformers
  22. Out with the MJ in with the Aikido
  23. What can I use parts for?
  24. Can someone help me understand this topology?
  25. Looking for PP design when I already have the OPTs
  26. New project, Damn Good 300B amp.
  27. medium power (~20W) amplifier and power supply requirements
  28. ID this Dynaco ST-70 board
  29. SRPP with different brand of tubes ?
  30. Best tube amp clone for stereo music
  31. RCA receivers / amps
  32. Triode PP design questions - where to add gain?
  33. Push Pull Tube Amplifier with CCS
  34. McIntosh MC275 problem.
  35. converting pentode data to triode-strapped? The 1609 pentode?
  36. Moscode 300 Manual/schematic
  37. Need help with new amp design
  38. 4699 SEP (unusual cathode feedback?)
  39. DH filament side matters?
  40. FU50 + 6N8P + 5Z3P Amplifier
  41. Collet wire connector for 300B socket?
  42. KT-88, KT-77, Russian 6SN7 makes "pops". Should I touch their pin with an iron?
  43. Tube Power Supply Question
  44. Would there be any harm using 10K OPT for 45 tubes?
  45. Restoring the first Pye HF25
  46. Jolida FX10 mods
  47. Help needed - DIY amp not working; first time powering up
  48. EL86: push-pull for home
  49. Input transformer question? Help identifying
  50. Anyone ever tried building the Feral Eye 2A3 PP?
  51. Schade Feedback In A Push Pull Differential Amplifier?
  52. PSA: new diy tubes sub on Reddit
  53. Hum/Buzz in a tube PP amp
  54. 300B+6GL7 SE stereo integrated amplifier
  55. Bias tap on b+ or separate winding?
  56. Arcturus No. 12 tube
  57. SainSmart 6N3 pre for Pass ACA
  58. Single ended MM tube phono amp
  59. 5U4G schematic for 4x6SN7 Stereo Octal Akido Preamp.
  60. ECL82 amp from old magnetophones
  61. Bogen MO100A with KT120 ??
  62. Someone sales out trafos Jensen transformers in europe?
  63. Book recommendation?
  64. Sanity check? HV supply for 125wpc sweep tube amp
  65. 6922 Technical info (help)
  66. How about this phono idea
  67. Scottkit trouble
  68. How to remove tube metalization
  69. Old Dynatron Information
  70. good driver tube with 150mA heater?
  71. Tell me what this is
  72. Switch between tubes with relay
  73. Need some help with my Palmer Eins
  74. A rare tube in my hands. Info please.
  75. Dealing with Heater Elevation/Ground Reference for aux circuit
  76. 6GK5 OR 6AH5 for phono head amp
  77. Parallel triodes: best connection?
  78. Which resistors to replace burned ones in Dared DV-300b monoblocks
  79. Unusual tube preamp, will it work?
  80. Eico HF-81 with Pre Out?
  81. volume control by pass power tube
  82. Single End Transfomers, The hysteresis loop and maximum current
  83. DC at output on startup
  84. Yet another ECC82/12AU7 Line Preamp
  85. Clarke and Smith EL84 Amp
  86. Are rectifier tubes still relevant? Why would you use one, or avoid using one?
  87. replace 5R4GA to WE 274B
  88. 6sl7 vs 6n9p vs 6n9s
  89. MAC bifilar output stage test proof
  90. Dummy load for bench testing tube pre.
  91. Brook 12A Mono blocks
  92. Maximum Ic before auto shutdown
  93. Octal Akido HP amp as pre amp
  94. loudspeaker series resistance question
  95. Which preamp a better match for low-volume listening?
  96. Balanced Signal, Phase Splitter in Push Pull topology
  97. Pin 4 Grid 2 Resistor
  98. Weird voltage w/ LM1084 regulators / #27 filaments
  99. My Audio Research SP-3-A1 Restoration and Questions Documentation
  100. Almarro a318B
  101. Bakelite and Car Brakefluid
  102. Chinese 6N2 / 6P1 schematics advice needed
  103. Operating point of GM70
  104. 50W 6L6 (6P7S) how to replace tube ccs for solid state?
  105. Star Grounding for a Line Stage Tube Preamp
  106. ID Kit Amp Help. K-12 Tube Amp or Similar?
  107. Are they still making Golden Dragon?
  108. About LL1660/18mA
  109. ST-120 tube set
  110. Newb seeks to drive DVC 4+4 ohm 500w RMS subwoofer with tubes.
  111. The 33 Amplifier
  112. Build Your Own Vacuum Tubes
  113. Can Anyone Tell Me What This Pot Does in AN Soro?
  114. Which high-voltage MOSFET for source follower?
  115. A Practical Circlotron You Can Build
  116. Noob questions
  117. JohnBlue TL66 Monoblocks hum problem. Help please
  118. ECL82 SE 1,8W
  119. RH slayer
  120. Cary SLP-90 preamp power supply
  121. phase splitter with low distortion
  122. First PSU Capacitor
  123. Chinese tubes
  124. SE class A2
  125. Dynaco MKIV 7199 driver circuit
  126. Someone out there....type of tube ?
  127. admiral 5t4a
  128. Pentode Screen Resistance (rs) Estimation Example
  129. Grounding linstage help
  130. What is this tube?
  131. Do 300b tube have a "guide pin"
  132. Effect of Weak Mains Power
  133. Using dht self bias resistor to lift idht front end heater
  134. Philips EL6411/01 amplifier
  135. Quad II output transformer
  136. Mosfet or other semiconductor substitute for cathodyne?
  137. 6SN7 preamp tube alternative with less gain?
  138. Hagerman Cornet Octal planning help and build
  139. output transformer opposing windings/ please explain
  140. Preamp Transformer overheats
  141. Can't identify this tube?
  142. 6SN7 pin 4 signal input
  143. Help - Tube PSU Design
  144. Little help for a newbie?
  145. Has anyone built this phono stage you can buy on ebay as a circuit board.
  146. pl504 Vacuum tube
  147. Tubes in the Unballancer
  148. Quad II Amplifier KT66 Valves/Tubes and Carbon Composition Resistors
  149. ecc88 preamp
  150. Tube socket center post
  151. Troubleshooting bias of old diy amp with Acrosound TO-300 transformer
  152. Dynaco Mark III with noisy transformer, making hum.
  153. Power amplifier EL 34
  154. Replace 6SN7 to E88CC on HP amp 90VDC plate capable?
  155. 1p24b Russian tube
  156. Tube power supply
  157. Tube-O-Philes, Please help with this chassis search
  158. WOW, I want one !!!
  159. What is this? Valve Amp?
  160. CCS instead of a resistor in the cathode of a cathode follower?
  161. Please comment on D3a tube testing
  162. ID tube amp kit 8 watts stereo.. unsure what tubes to use
  163. Mixed bias for 6336a or 6AS7 output tubes?
  164. Vintage Tube Amp kit - Can it be refurbished?
  165. Any experience or opinion about 300B/EL34 Chinese DIY Kit ...
  166. SE (UL ?) HI FI project needs help
  167. Can anyone verify this math? MC 2205 Watt Scale
  168. Generic design question for Pentode CCS
  169. Using big power tubes as buffer?
  170. Reason for tube converter
  171. Valve Mosfet Hybrids: a solution
  172. Protecting Plitron OPT
  173. DHT line stage 26, 01a or 101d
  174. Tube manufacturers
  175. Pinnacle Datasheets
  176. Tube preamp
  177. Can I use 1.1 instead of .47
  178. Project: Add a DAC to Pete Millett's low voltage hybrid tube amp
  179. Speakers for S5 K-16LS Kit
  180. Inexpensive B+ Batteries
  181. Leak Stereo 20 Capacitor Replacement Question
  182. Dynaco Mark IV exploding bias filter capacitor
  183. Anyone familiar with the Raphaelite sinovt 2a3-845
  184. Building monoblocks, go Dynaco MKIII or.....?
  185. Priboi (Surf :d) output transformer possible problem
  186. replacing ECC83 with ECC82 in stereo amp
  187. Counterpoint SA-5000 FET Buffer
  188. C3M 300B SET build, input appreciated.
  189. K12G Quiet Channel
  190. Weird "holes" in getter
  191. Radiotron A530 6J7G-6V6G-2A3 PP Amp
  192. Tube Identification
  193. Can i sub a 50K for a 100K volume control?
  194. Are the 12B4 and 12b4A interchangable?
  195. SE or PSE amplifier with 6N6P driving the 300B tube
  196. About 300B SE heater w/t Coleman regulator
  197. Should my TVC x formers be input or output
  198. Preamp Chassis Layout Advice
  199. Russian Audio Tubes
  200. SE UL EL 300 / ECC 83
  201. Grid Chokes
  202. Pot for project test
  203. Interpreting "Horizontal Osc. Service"
  204. My Take on a DIY Valve tester
  205. 6Н6П vs 6Н6П-И (gold grid etc claims ? )
  206. GU 19 VS GU 19-1 What's the difference ?
  207. please advice 1K Vdc power supply
  208. Has anyone used an opamp to split phase for a tube amp?
  209. Advice for budget valve amplifier
  210. S-5 Electronoics K-12M amplifier: lack of plate to grid coupling caps
  211. Eico ST70 needs a preamp output....
  212. Damper diode slow start
  213. KT150 SE based on Mikael's KT88 Schematic
  214. Octal driver tube choice
  215. Anyone ever clone a Audionote P1 SE
  216. Bogen DB212 phase-inverter
  217. EAR 869
  218. # triode 31 line pre amp
  219. Choosing The Iron For A SE OPT?
  220. Swap EL34 with 6L6 or 6V6
  221. Bridgeable floating output transformer help
  222. tapedeck playback amplifier
  223. Design based on the Output Transformer
  224. UL Push-Pull Tube Amp (mono combo)
  225. Power transformer for SET: toroid vs EI core
  226. can I use 12v to run 6C33C tubes???
  227. How to understand the data sheet for this 'universal' SE output transformer?
  228. DIY Stereo Amp
  229. el84 and 6aw8a
  230. Tube amp reboot Re: Chinese 6P6P (6V6) Push-Pull Tube Amplifier Kit
  231. 2A3 driver
  232. Tube Phono Preamps
  233. Newbie. Balanced 2A3 SE amplifier information
  234. Tube rectifier supply help
  235. cathode follower - please check my circuit
  236. Output tube stage 1578 for no DAC
  237. Bias for 300B
  238. Pots value in tube equalizer
  239. 'Real world' max plate voltages for 6DJ8, 6P15P?
  240. Lower load resistance for lower distortion (6L6 PP)
  241. Transformer Hum.
  242. Hmmmm Star ground
  243. Taylor T20 triode - anyone used these?
  244. Filament DC power supply for 2 valves
  245. Tubes availability
  246. Tube power amp bad fit for ML?
  247. SLA Battery (Filament Supply) DC Reference limits?
  248. Citation I, Citation II, and another Citation I
  249. tube amp damping / weird bass response, speaker movement
  250. Convert valve output stage to pre amp

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