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View Full Version : Tubes / Valves


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  1. Preamp/Phono Stage Transformer
  2. Yaqin MC10
  3. the small SE UL ECL 805 / EY 82 !!!
  4. Offering from China
  5. Name that tube manufacturer
  6. Does sunlight affect valve characteristics?
  7. Can we talk about series/pass regulators?
  8. How electrically fragile /robust are valves?
  9. Altec Lansing 345a variant/homebrew
  10. Another newb with a plan-to-build saying hello
  11. What is the closed alternative to CV4002?
  12. A safe Dc coupled amp
  13. 6550b amplifier schematic
  14. Chokes on the old days VS. flter caps
  15. Old tube amp used outside.
  16. Has anyone tried Metglass C-Cores in Audio Transformers ?
  17. Dynaco ST-70 rebuild makes hum when plugged to input, not with shorting plug
  18. 12ax7/5751 - using the full tube or half in gain stage
  19. When is too strong a tube still good ??
  20. Would you say this is good or bad blue glow?
  21. 211 vacuum tube rolling for Air Tight 211
  22. Is it ok to put a valve inside a vented enclosure ?
  23. What phase splitter is this?
  24. 6GK5 as input tube for phono preamp?
  25. Tube bias problems
  26. K12 change transformer
  27. Me and my soon to be amplifier
  28. Pioneer ER-420 tuner dial issue.
  29. Akai M8 Amplifier Mods
  30. The 'every tube' amplifier
  31. EL84 power supply
  32. resistor in HT supply
  33. Any Chinese amp that can be a good platform to mod into high end quality?
  34. 5824 (25B6G) output tube
  35. relative impedance of balance pot to volume pot
  36. Glassware Opinions
  37. Tip for searching for schematics
  38. Why is a (power) triode so expensive?
  39. Advise on output transformer vs PP tubes
  40. newbie heater filament issues
  41. Grid-cathode voltage and grid current in 12AX7?
  42. Lafayette LA-240. Schematic please.
  43. A little advice ? Please
  44. CF output stage - float heater or tie to cathode?
  45. Help redesigning schematic from GZ34 to EY200A rectifiers
  46. 12 VAC Aikido, need part numbers
  47. 12BZ7
  48. Troubleshooting 6GU7/KT88 Williamson Amplifier
  49. 12AX7 stand alone preamp output load
  50. Super Triode Connected (STC) chip amp
  51. WE 350B and tube tester
  52. Lundahl LL9202 secondary inductance help
  53. Low noise compromise
  54. RH 6550 SE amplifier
  55. Help substituting power transformer.
  56. acuhorn clone
  57. Low Voltage Tube Head Amp.
  58. Balanced Tube Headphone Amplifier?
  59. Williamson amplifier re-build
  60. Out of the Box: Part 6, a 25W PP UL 6L6GC Monoblock
  61. Grundig External Speaker amplifier IV
  62. Parts for 8audio EL34 Jadis JA30 build
  63. Question about output transformer
  64. Current Shunt
  65. Parafeed L & C calculations wrt Z?
  66. Cathode Bias Resistor and Capacitor Values
  67. Pentone preamp to get some saturation for SS amp
  68. Out of the Box Part 5: SE 6AQ5 Completley Integrated Amp
  69. Forgive Me DIY Audio, For I Have Sinned 10LY8
  70. Amazon resistor "selections"
  71. PSUD II question
  72. Suggestion of schematic for a high quality preamp
  73. Purist Wet Dreams Customized Review
  74. Triodes and feedback theory
  75. Transformer taps
  76. my new philips stereo system!
  77. Phono preamp with modern pentode as first stage
  78. Adding headphone output to Aikido LV
  79. QEE3041 output trafo on tube amps?
  80. 6A3 Cool Amp
  81. Magnavox 175 - different feedback in each channel
  82. Outside the Box, Part 4, a Class AB2 PP 6V6 Amp
  83. 6GF7 and 300B amp
  84. AC filament and ground
  85. Dummy load for tube amp
  86. have i just blown my valve amp?
  87. Sub miniature pentodes - what shall I do with them?
  88. DRD calcurator
  89. OTs in parrallel without one tube
  90. Cathodyne investigation - stop the presses!
  91. Special offer for skilled tube fanatics
  92. Heathkit w7-M Power Supply Sidebands
  93. Morrison 300B SET - where to connect current meters?
  94. Could someone look over my schema?
  95. question on 101D tube
  96. Outside the Box- Part lll, Twin Coupled Amp
  97. Thoriated Tungsten Filament 2A3?
  98. Screen resistor sag limiting zener.
  99. Baffling Hum Issue
  100. Can I replace 6H9C (6SL7) with 6SN7?
  101. How Good Is This Amp(Sound Luster)
  102. 6V6 grid-to-ground resistor tone shaping?
  103. Pioneer SX-34B
  104. Outside the Box - Part ll All Triode UL PP Amplifier
  105. How to add Global NFB to a circuit with LED bias and cathode follower?
  106. Heathkit EA-2 customization
  107. cathode feedback transformer and damping factor
  108. Is my 274b/n defective
  109. Need to find 300B tube amp use 6SN7 5U4G >25w/ch
  110. Two SE OPT -> one PP OPT?
  111. Thinking Outside the Box - A Different Kind of Triode Audio Amplifier
  112. Amp Circuits Tutorial
  113. Push pull ecl86 stereo amp
  114. Using a CCS for bias.
  115. Using Telefunken EL-156 in Dynaco Mark III amp
  116. preamplifier with POSITIVE bootstrap feedback
  117. Low Voltage Aikido questions
  118. EL84 driver stage
  119. I had an idea for a SE UL amp with local feedback output stage
  120. Woolgathering
  121. all dht system?
  122. Question - Labeling Tested Tubes
  123. Filament bias impedance.
  124. Tube amp inactivity auto-off
  125. High gm version of 12AU7
  126. Need help on B+ output
  127. Tube substitute
  128. DIY SRPP ecc82
  129. Schematic needed for circa 1985 tube preamp kit
  130. Ultra-Linear Midget Amp ?
  131. Why do cathode followers have 100% feedback?
  132. 12AX7 + 12AU7 preamp with feedback?
  133. Counterpoint SA 3000 Transformer
  134. EL 84 in triode
  135. Pictures of your socket dampers (shock mounts) installed!
  136. Amperex bugle boy help
  137. Old tube Tek sig generator - what's good in there?
  138. Can I use a PP interstage for SE?
  139. Classic 4 valve PPP circuits
  140. Ultra linear OT PP 30W/25W for SE amp of low power? Safe?
  141. 12v/24v RIAA MM preamp
  142. Schiit LISST SS tubes?
  143. Feline Futterman OTL Amp
  144. CatSkin Class A2 SET with Secondary Flux Cancellation
  145. How to wire a 4pin base to 5 pin top tube socket adapter
  146. Coupling cap spec
  147. Bought 6AS5, got 6AS6 instead. Any audio use?
  148. Help verifying EF86
  149. Quad II power transformer
  150. KT88 Mutual Conductance Test
  151. 4P1L worth stocking up?
  152. Help Identifying A Valve Amplifier
  153. Sonic Frontiers Power 3 Help Needed
  154. Re-build of my first OTL from 2000
  155. Help with choosing substitute output transformer??
  156. Last stop before the end of the road !
  157. Output Transformer insertion/power losses
  158. OTL, not OTL, & Matching VS Loading transformers
  159. Out with the MJ in with the Aikido
  160. What can I use parts for?
  161. Can someone help me understand this topology?
  162. Looking for PP design when I already have the OPTs
  163. New project, Damn Good 300B amp.
  164. medium power (~20W) amplifier and power supply requirements
  165. ID this Dynaco ST-70 board
  166. SRPP with different brand of tubes ?
  167. Best tube amp clone for stereo music
  168. RCA receivers / amps
  169. Triode PP design questions - where to add gain?
  170. Push Pull Tube Amplifier with CCS
  171. McIntosh MC275 problem.
  172. converting pentode data to triode-strapped? The 1609 pentode?
  173. Moscode 300 Manual/schematic
  174. Need help with new amp design
  175. 4699 SEP (unusual cathode feedback?)
  176. DH filament side matters?
  177. FU50 + 6N8P + 5Z3P Amplifier
  178. Collet wire connector for 300B socket?
  179. KT-88, KT-77, Russian 6SN7 makes "pops". Should I touch their pin with an iron?
  180. Low voltage Tubelab sse
  181. Tube Power Supply Question
  182. Would there be any harm using 10K OPT for 45 tubes?
  183. Restoring the first Pye HF25
  184. Jolida FX10 mods
  185. Help needed - DIY amp not working; first time powering up
  186. hybrid output
  187. EL86: push-pull for home
  188. Input transformer question? Help identifying
  189. Anyone ever tried building the Feral Eye 2A3 PP?
  190. Schade Feedback In A Push Pull Differential Amplifier?
  191. PSA: new diy tubes sub on Reddit
  192. Hum/Buzz in a tube PP amp
  193. 300B+6GL7 SE stereo integrated amplifier
  194. Bias tap on b+ or separate winding?
  195. Arcturus No. 12 tube
  196. SainSmart 6N3 pre for Pass ACA
  197. Single ended MM tube phono amp
  198. 5U4G schematic for 4x6SN7 Stereo Octal Akido Preamp.
  199. ECL82 amp from old magnetophones
  200. Bogen MO100A with KT120 ??
  201. Someone sales out trafos Jensen transformers in europe?
  202. Book recommendation?
  203. Sanity check? HV supply for 125wpc sweep tube amp
  204. 6922 Technical info (help)
  205. How about this phono idea
  206. Scottkit trouble
  207. How to remove tube metalization
  208. Old Dynatron Information
  209. good driver tube with 150mA heater?
  210. Tell me what this is
  211. Switch between tubes with relay
  212. Need some help with my Palmer Eins
  213. A rare tube in my hands. Info please.
  214. Dealing with Heater Elevation/Ground Reference for aux circuit
  215. 6GK5 OR 6AH5 for phono head amp
  216. Parallel triodes: best connection?
  217. Which resistors to replace burned ones in Dared DV-300b monoblocks
  218. Unusual tube preamp, will it work?
  219. Eico HF-81 with Pre Out?
  220. volume control by pass power tube
  221. Single End Transfomers, The hysteresis loop and maximum current
  222. DC at output on startup
  223. Yet another ECC82/12AU7 Line Preamp
  224. Clarke and Smith EL84 Amp
  225. Are rectifier tubes still relevant? Why would you use one, or avoid using one?
  226. replace 5R4GA to WE 274B
  227. 6sl7 vs 6n9p vs 6n9s
  228. MAC bifilar output stage test proof
  229. Dummy load for bench testing tube pre.
  230. Brook 12A Mono blocks
  231. Maximum Ic before auto shutdown
  232. Octal Akido HP amp as pre amp
  233. loudspeaker series resistance question
  234. Which preamp a better match for low-volume listening?
  235. Balanced Signal, Phase Splitter in Push Pull topology
  236. Pin 4 Grid 2 Resistor
  237. Weird voltage w/ LM1084 regulators / #27 filaments
  238. My Audio Research SP-3-A1 Restoration and Questions Documentation
  239. Almarro a318B
  240. Bakelite and Car Brakefluid
  241. Chinese 6N2 / 6P1 schematics advice needed
  242. Operating point of GM70
  243. 50W 6L6 (6P7S) how to replace tube ccs for solid state?
  244. Star Grounding for a Line Stage Tube Preamp
  245. ID Kit Amp Help. K-12 Tube Amp or Similar?
  246. Are they still making Golden Dragon?
  247. About LL1660/18mA
  248. ST-120 tube set
  249. Newb seeks to drive DVC 4+4 ohm 500w RMS subwoofer with tubes.
  250. The 33 Amplifier

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