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  1. AC filament and ground
  2. Dummy load for tube amp
  3. have i just blown my valve amp?
  4. Sub miniature pentodes - what shall I do with them?
  5. DRD calcurator
  6. OTs in parrallel without one tube
  7. Cathodyne investigation - stop the presses!
  8. Special offer for skilled tube fanatics
  9. Heathkit w7-M Power Supply Sidebands
  10. Morrison 300B SET - where to connect current meters?
  11. Could someone look over my schema?
  12. question on 101D tube
  13. Outside the Box- Part lll, Twin Coupled Amp
  14. Thoriated Tungsten Filament 2A3?
  15. Screen resistor sag limiting zener.
  16. Baffling Hum Issue
  17. Can I replace 6H9C (6SL7) with 6SN7?
  18. How Good Is This Amp(Sound Luster)
  19. 6V6 grid-to-ground resistor tone shaping?
  20. Pioneer SX-34B
  21. Outside the Box - Part ll All Triode UL PP Amplifier
  22. How to add Global NFB to a circuit with LED bias and cathode follower?
  23. Heathkit EA-2 customization
  24. cathode feedback transformer and damping factor
  25. Is my 274b/n defective
  26. Need to find 300B tube amp use 6SN7 5U4G >25w/ch
  27. Two SE OPT -> one PP OPT?
  28. Thinking Outside the Box - A Different Kind of Triode Audio Amplifier
  29. Amp Circuits Tutorial
  30. Using a CCS for bias.
  31. Using Telefunken EL-156 in Dynaco Mark III amp
  32. preamplifier with POSITIVE bootstrap feedback
  33. Low Voltage Aikido questions
  34. EL84 driver stage
  35. I had an idea for a SE UL amp with local feedback output stage
  36. Woolgathering
  37. all dht system?
  38. Question - Labeling Tested Tubes
  39. Filament bias impedance.
  40. Tube amp inactivity auto-off
  41. High gm version of 12AU7
  42. Need help on B+ output
  43. Tube substitute
  44. DIY SRPP ecc82
  45. Schematic needed for circa 1985 tube preamp kit
  46. Ultra-Linear Midget Amp ?
  47. Why do cathode followers have 100% feedback?
  48. 12AX7 + 12AU7 preamp with feedback?
  49. Counterpoint SA 3000 Transformer
  50. EL 84 in triode
  51. Pictures of your socket dampers (shock mounts) installed!
  52. Amperex bugle boy help
  53. Old tube Tek sig generator - what's good in there?
  54. Can I use a PP interstage for SE?
  55. Classic 4 valve PPP circuits
  56. Ultra linear OT PP 30W/25W for SE amp of low power? Safe?
  57. 12v/24v RIAA MM preamp
  58. Schiit LISST SS tubes?
  59. Feline Futterman OTL Amp
  60. CatSkin Class A2 SET with Secondary Flux Cancellation
  61. How to wire a 4pin base to 5 pin top tube socket adapter
  62. Coupling cap spec
  63. Bought 6AS5, got 6AS6 instead. Any audio use?
  64. Help verifying EF86
  65. Quad II power transformer
  66. KT88 Mutual Conductance Test
  67. 4P1L worth stocking up?
  68. Help Identifying A Valve Amplifier
  69. Sonic Frontiers Power 3 Help Needed
  70. Re-build of my first OTL from 2000
  71. Help with choosing substitute output transformer??
  72. Last stop before the end of the road !
  73. Output Transformer insertion/power losses
  74. OTL, not OTL, & Matching VS Loading transformers
  75. Out with the MJ in with the Aikido
  76. What can I use parts for?
  77. Can someone help me understand this topology?
  78. Looking for PP design when I already have the OPTs
  79. New project, Damn Good 300B amp.
  80. medium power (~20W) amplifier and power supply requirements
  81. ID this Dynaco ST-70 board
  82. SRPP with different brand of tubes ?
  83. Best tube amp clone for stereo music
  84. RCA receivers / amps
  85. Triode PP design questions - where to add gain?
  86. Push Pull Tube Amplifier with CCS
  87. McIntosh MC275 problem.
  88. converting pentode data to triode-strapped? The 1609 pentode?
  89. Moscode 300 Manual/schematic
  90. Need help with new amp design
  91. 4699 SEP (unusual cathode feedback?)
  92. DH filament side matters?
  93. FU50 + 6N8P + 5Z3P Amplifier
  94. Collet wire connector for 300B socket?
  95. KT-88, KT-77, Russian 6SN7 makes "pops". Should I touch their pin with an iron?
  96. Low voltage Tubelab sse
  97. Tube Power Supply Question
  98. Would there be any harm using 10K OPT for 45 tubes?
  99. Restoring the first Pye HF25
  100. Jolida FX10 mods
  101. Help needed - DIY amp not working; first time powering up
  102. hybrid output
  103. EL86: push-pull for home
  104. Input transformer question? Help identifying
  105. Anyone ever tried building the Feral Eye 2A3 PP?
  106. Schade Feedback In A Push Pull Differential Amplifier?
  107. PSA: new diy tubes sub on Reddit
  108. Hum/Buzz in a tube PP amp
  109. 300B+6GL7 SE stereo integrated amplifier
  110. Bias tap on b+ or separate winding?
  111. Arcturus No. 12 tube
  112. SainSmart 6N3 pre for Pass ACA
  113. Single ended MM tube phono amp
  114. 5U4G schematic for 4x6SN7 Stereo Octal Akido Preamp.
  115. ECL82 amp from old magnetophones
  116. Bogen MO100A with KT120 ??
  117. Someone sales out trafos Jensen transformers in europe?
  118. Book recommendation?
  119. Sanity check? HV supply for 125wpc sweep tube amp
  120. 6922 Technical info (help)
  121. Help a noob with respeccing a transformer for silicon rectifiers.
  122. How about this phono idea
  123. Scottkit trouble
  124. Rectifier - tube or semiconductor?
  125. How to remove tube metalization
  126. Old Dynatron Information
  127. good driver tube with 150mA heater?
  128. Tell me what this is
  129. Switch between tubes with relay
  130. Need some help with my Palmer Eins
  131. A rare tube in my hands. Info please.
  132. Dealing with Heater Elevation/Ground Reference for aux circuit
  133. 6GK5 OR 6AH5 for phono head amp
  134. Parallel triodes: best connection?
  135. Which resistors to replace burned ones in Dared DV-300b monoblocks
  136. Unusual tube preamp, will it work?
  137. Eico HF-81 with Pre Out?
  138. volume control by pass power tube
  139. Single End Transfomers, The hysteresis loop and maximum current
  140. DC at output on startup
  141. Star ground in an LCLC filter
  142. Yet another ECC82/12AU7 Line Preamp
  143. Clarke and Smith EL84 Amp
  144. Are rectifier tubes still relevant? Why would you use one, or avoid using one?
  145. replace 5R4GA to WE 274B
  146. 6sl7 vs 6n9p vs 6n9s
  147. MAC bifilar output stage test proof
  148. Dummy load for bench testing tube pre.
  149. Brook 12A Mono blocks
  150. Maximum Ic before auto shutdown
  151. Octal Akido HP amp as pre amp
  152. loudspeaker series resistance question
  153. Pop when power on
  154. Which preamp a better match for low-volume listening?
  155. Balanced Signal, Phase Splitter in Push Pull topology
  156. Pin 4 Grid 2 Resistor
  157. Weird voltage w/ LM1084 regulators / #27 filaments
  158. My Audio Research SP-3-A1 Restoration and Questions Documentation
  159. Almarro a318B
  160. Bakelite and Car Brakefluid
  161. Chinese 6N2 / 6P1 schematics advice needed
  162. Operating point of GM70
  163. 50W 6L6 (6P7S) how to replace tube ccs for solid state?
  164. Star Grounding for a Line Stage Tube Preamp
  165. ID Kit Amp Help. K-12 Tube Amp or Similar?
  166. Are they still making Golden Dragon?
  167. About LL1660/18mA
  168. ST-120 tube set
  169. Newb seeks to drive DVC 4+4 ohm 500w RMS subwoofer with tubes.
  170. The 33 Amplifier
  171. Build Your Own Vacuum Tubes
  172. Can Anyone Tell Me What This Pot Does in AN Soro?
  173. Which high-voltage MOSFET for source follower?
  174. Stacked Power Supply
  175. A Practical Circlotron You Can Build
  176. Noob questions
  177. JohnBlue TL66 Monoblocks hum problem. Help please
  178. ECL82 SE 1,8W
  179. RH slayer
  180. Cary SLP-90 preamp power supply
  181. phase splitter with low distortion
  182. First PSU Capacitor
  183. Transformer locations
  184. Chinese tubes
  185. ez81 power supply
  186. SE class A2
  187. Dynaco MKIV 7199 driver circuit
  188. Be Cautious with Obbligato Film Caps
  189. Someone out there....type of tube ?
  190. admiral 5t4a
  191. Pentode Screen Resistance (rs) Estimation Example
  192. Grounding linstage help
  193. What is this tube?
  194. Do 300b tube have a "guide pin"
  195. Effect of Weak Mains Power
  196. Croatian Triode Festival Zadar-2016
  197. Using dht self bias resistor to lift idht front end heater
  198. Philips EL6411/01 amplifier
  199. Quad II output transformer
  200. Mosfet or other semiconductor substitute for cathodyne?
  201. 6SN7 preamp tube alternative with less gain?
  202. Hagerman Cornet Octal planning help and build
  203. output transformer opposing windings/ please explain
  204. Preamp Transformer overheats
  205. Finishing ASC capacitors
  206. Can't identify this tube?
  207. 6SN7 pin 4 signal input
  208. Help - Tube PSU Design
  209. Little help for a newbie?
  210. Has anyone built this phono stage you can buy on ebay as a circuit board.
  211. pl504 Vacuum tube
  212. Tubes in the Unballancer
  213. Quad II Amplifier KT66 Valves/Tubes and Carbon Composition Resistors
  214. ecc88 preamp
  215. Tube socket center post
  216. Troubleshooting bias of old diy amp with Acrosound TO-300 transformer
  217. Dynaco Mark III with noisy transformer, making hum.
  218. Power amplifier EL 34
  219. Replace 6SN7 to E88CC on HP amp 90VDC plate capable?
  220. 1p24b Russian tube
  221. Tube power supply
  222. Tube-O-Philes, Please help with this chassis search
  223. WOW, I want one !!!
  224. B&K dyna-quick 550
  225. What is this? Valve Amp?
  226. CCS instead of a resistor in the cathode of a cathode follower?
  227. Please comment on D3a tube testing
  228. ID tube amp kit 8 watts stereo.. unsure what tubes to use
  229. Mixed bias for 6336a or 6AS7 output tubes?
  230. Vintage Tube Amp kit - Can it be refurbished?
  231. Any experience or opinion about 300B/EL34 Chinese DIY Kit ...
  232. Measuring "high impedance voltage" with digital multimeter
  233. SE (UL ?) HI FI project needs help
  234. Can anyone verify this math? MC 2205 Watt Scale
  235. Generic design question for Pentode CCS
  236. Using big power tubes as buffer?
  237. Reason for tube converter
  238. Valve Mosfet Hybrids: a solution
  239. Protecting Plitron OPT
  240. DHT line stage 26, 01a or 101d
  241. Tube manufacturers
  242. Pinnacle Datasheets
  243. Tube preamp
  244. Can I use 1.1 instead of .47
  245. Project: Add a DAC to Pete Millett's low voltage hybrid tube amp
  246. Speakers for S5 K-16LS Kit
  247. Inexpensive B+ Batteries
  248. Leak Stereo 20 Capacitor Replacement Question
  249. Dynaco Mark IV exploding bias filter capacitor
  250. Anyone familiar with the Raphaelite sinovt 2a3-845

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