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  1. IT stage microphony
  2. first amplifier question
  3. 5687 tube 6.3VDC heater pins connection
  4. Preamp Power Supply - HV, filament & chassis earth - question
  5. Hybrid with a difference?
  6. Need Schematic for 6C5 Linestage
  7. KT88 PS Caps?
  8. Jolida 102B ALPS RK27 Install Tricks
  9. Yet another CCS
  10. Heater cathode potential
  11. Preamp HV and coupling cap question
  12. I am looking for the circuit from a tube amp (description and photo attached)
  13. Tube surround sound/hafler home theater build
  14. Looking at more preamps........
  15. Help me to improve my 6n6p/El34 UL...CCS/AnodeChoke/Transformer ?
  16. Darkvoice 336 tubes
  17. GU-50 opt in europe
  18. OPT on Ebay, any one know or use this?
  19. VTA M-125 mono block kit.
  20. 6V6 Regulator Issue
  21. Tube phono stage build
  22. First valve amplifier, tunings!
  23. Looking for 7N7 preamp schematic
  24. Line Magnetic LM-216 -- Annoying Hum
  25. Anthem Pre2L Special Edition...tubes?
  26. 6550 tube compatibles?
  27. Dynaco VTA ST-120.
  28. Tube amp help
  29. Transmitting tubes eg; 805 datasheet, Rp, gm, mu?
  30. 300b selectable ac or dc filament supply?
  31. Russian 6J43P-E(6Ж43ПE) Dual anode pentode....
  32. suitable 1:2 opt for a headphone amp
  33. Primary impedance, which tube?
  34. Dual-control, sharp-cutoff pentode
  35. Big transformer for little project?
  36. Entry in to DIY Tube world with 300B SET Kit
  37. Dynaco ST-70, Original or Mod?
  38. Damper diode as delay
  39. Thoughts on this design......
  40. Output Transformer Question
  41. Feedback on Andrea Ciuffoli's Extreme Hi-End Hybrid Amplifier
  42. Help troubleshooting oscillation
  43. Audio Research VS110
  44. Re-activate getter/save gassy tube
  45. What does 40% screen tap mean for UL OPT?
  46. Which pentode mode is this?
  47. ST-70 Power supply questions
  48. 3 stage DC - any thoughts?
  49. Help to choose the right EL34 schematic
  50. Russian tubes - Classification of various brands?
  51. hot bias- actually hot?
  52. POT between EAR834 phono and power amp
  53. Matching 100 tubes ECC803S
  54. EL34 Single-ended Class A tube amplifier KIT
  55. Help to de-bug a 6AH9/mosfet concertina driver
  56. How is this possible??
  57. 10k power tube load
  58. Phonola Record Player TK 2146
  59. Anode Bootstrapping
  60. basic line stage testing
  61. Question about power transformer choice.
  62. Separating power supply with SET amps
  63. Weird EL84 and 6p14p-k tubes
  64. genuine 6P14P-EB?
  65. Power Transformer for OTL Headphone Amp
  66. Magnetic relay to drive with small-signal tube
  67. rj6 coaxial cable to wire the input connections to the input/driver tubes?
  68. Noob question: one channel is dead; safe to swap tubes to troubleshoot?
  69. Little 6BQ5 am squealing....HELP
  70. output trans for input trans
  71. Emulating Ultra Linear Mode
  72. Mullard 5-20 and logarithmic passive volume control: how to connect ?
  73. Chinese EL34B SE "A10" Disection
  74. indicator light using filament 6.3VAC voltage
  75. 6p42s tubes
  76. Type 79 Tube Question
  77. Preamp for 6N3 tube
  78. In praise of Tribute Autoformer Volume Control
  79. 12AE7 Automotive Tube Amplifier
  80. Using a LM317 for setting tube bias
  81. KT120 LED bias?
  82. Tubes with different mu in a cathode follower
  83. Scott LK-48 stock?
  84. Troubleshooting question
  85. Constant current load for testing power supplies
  86. Push Pull Parafeed Headphones Amp
  87. Grommes 20PG8 Amp Motorboating
  88. Anyother tube with same pinout than 6CG7?
  89. Calculating coupling capacitor values
  90. Help with Welborne DRD 45 amp
  91. GU-50 + solid state driver
  92. ECC82. JJ vs vintage, peculiar frequency response tests
  93. How to Bias Morrison Micro 2A3?
  94. Solid state feeding a tube amplifier
  95. Power Transformer for 845 Monoblock?
  96. 16LS Kit
  97. 12 pin compactron pinout dimensions ?
  98. Mullard 3-3 build oscillation?
  99. LTSpice newbie: why doesn't the EL34 sim properly?
  100. Op Amp booster circuits, tube hybrid
  101. 150K resistor at input. Too high value?
  102. Looking for a book about valve amps (MJ not suitable)
  103. Power Transformer for Decware ZBox
  104. mu-follower for hybrid amp
  105. Quick Question on Grid NFB
  106. Vintage SE output transformer has a G2 tap
  107. Views on a regulated bias supply
  108. Distortion in cathode follower output stage
  109. VT4-B
  110. series heater voltage for 5-channel preamp
  111. Tube Technology Unisis Information
  112. Newbie with k-16ls
  113. can i run parallel se 300b's off one supply winding
  114. volume fluctuation on tube amp
  115. The chassis, to ground or not to ground.....
  116. Substitute for RCA 841 driving 300B
  117. Music Angel
  118. Priboj with other tubes
  119. 211 Melody Platinum amplifier.
  120. Cloning my 1968 stereo.....power transformer question.
  121. DC Coupled EL34 Biasing - Help Request
  122. K-12G Tube amp Hum at low volume
  123. SE 6c33 Amplifier OPT overshoot/ringing oscillations
  124. Dynaco MKIII issue
  125. "SRPP" 300B Headphone Amplifier
  126. LDR's in the Marantz 10b
  127. Shuguang Treasure CV181-Z Lifespan in hours?
  128. Need to help to understand using 6x5 as half wave rect
  129. 300B plate voltages
  130. Mullard 3-3 power supply
  131. Best path into diy hifi tube audio
  132. 801A PP or 2a3 PP
  133. Shuguang Treasure tube genuine source?
  134. Passive RIAA with 6F12P and 6N5P
  135. ANDREA a Democratic hybrid amp for luxury sound
  136. Quad II classic output transformer
  137. overheating 10w resistor in power supply
  138. Strange EL34BW
  139. Scott LC21 tube hums when hand is near
  140. Heater Elevation & Dual Rail Power Supply
  141. Request for help with Wavebourn's SVCS
  142. Lundahl LL1682PP suitable for 300B PP amp?
  143. Modding input of EAR859 to feed output for Bi-Amp?
  144. Voltage gain triode
  145. Excellent midbass performance
  146. 6SN7 Mu Follower problem in distortion
  147. 6N7's in phase inverter service
  148. Going to Amberg Germany and Graz Austria, Any DIY-ers in the area have time to meet?
  149. Mullard 3-3, wrong power transformer
  150. Tube hybrid vfet
  151. 12ax7 + 12au7 strange behavior
  152. Hybrid amplifier with 6SN7 or 6SL7 tube
  153. Dynaco ST70 midrange glare
  154. Request review of my schematic
  155. 12AX7/12AU7 Williamson-style front end
  156. No-Vacuum Diamond Triode Device
  157. 6CB6 pentodes and 12AU7 twin triode to replace 7199 in major SCA35 rebuild
  158. miniwatt as headphone amp, impedance Q
  159. Fluorescing GU 29 tubes - whats wrong?
  160. SE 6CA7 Stereo Tube Amplifier Pot Hum
  161. Paragon 12A
  162. Need Help with PSU for KT120 / KT150 SE
  163. SE valve tube output transformer clarification.
  164. Poor valves or expecting too much ?
  165. ST-70 vs. Mark IV heater connections
  166. 6H8C Glass Moves
  167. Audio Research LS2BMkII parts identification
  168. Newbie Recapping, Help identifying caps
  169. Suppressor Grid tied to plate and not ground
  170. Picked up a heathkit aa - 32. ....now what.
  171. EL34 Internal shorts
  172. Questions about this EL34 amp design
  173. Troubleshooting 6550 Jadis Clone
  174. Help the newb: cathode to heater shortage
  175. Diy tube amp recommandation
  176. Bogen Presto Challenger AC220 Stereo Amplifier
  177. How to parafeed 811a from this schematic
  178. Help me to understand a simple bias question...
  179. Poinz Musical Machine - which class is it?
  180. A question on tube rolling
  181. Small tube stash - whats useful?
  182. Parallel triodes, single output question
  183. EL84 red plating
  184. ECC83 self-bias test circuit, weird mesurements
  185. AIKIDO
  186. vintage electronics kit
  187. Revox 40 tube amp 4 x ecl86
  188. DIY Preamp Issues
  189. 6n16b operating point
  190. Pete Millett's MAGIC BOX (6BN6 tube)
  191. Need confirmation if my schematic is good at all. It uses 50L6 as a stereo hi fi amp
  192. Chinese 6SN7 300B SE Amp - need help to tweak
  193. Kondo KSL-M77 heater regulator?
  194. Quad II issues
  195. THD measurements keithley 2015 integrated anp
  196. SRPP #56>D3A>EL 156 SE Build.
  197. webcore schematics???
  198. Purpose of LC Circuit going to Output Transformer?
  199. 12ax7+12au7 for DAC i/v
  200. Eico 666 settings for 5670
  201. transconductance conversion
  202. What is the pressure inside a mercury rectifier?
  203. Strange distortion value?
  204. Glass Ware and Pass
  205. Is over or undervolting bad for amps?
  206. Mod an EICO ST-70 or HF-20 into FISHER KX-200?
  207. Paralleled 12AX7's for phono stage
  208. Drive
  209. Telefunken Princess II 5486MX transformer question
  210. DAC in the Amp?
  211. Tube data for the 9AM10
  212. 5687 headphone amp
  213. Marantz Model 9 Prototype.
  214. Motorboating Tubes
  215. Mc Farlow f1mk2
  216. Global Matching of Great Tube WE300B, WE417A...etc
  217. What to do with unused half of triode ?
  218. Dynaco Mk III output transformers
  219. Gu-15
  220. Making a console stereo to a speaker amp?
  221. Strange valve pre amp on ebay.
  222. 833A "budget" design
  223. FU50 tube amp mods and schematic
  224. Tube type W1039 (subs NR27/A or CV1161) - Needs Datasheet, curves and/or info (any)
  225. Audio Research SP6B
  226. VTA PH16 Build
  227. What tubes to use with this Interstage Transformers?
  228. Questions and Problems with Mullard 5-10 clone
  229. semi scratch build; pas 3 board and pwr supply
  230. SHIII project, All-Pentode PP
  231. Battery bias and negative feedback
  232. schematic/kit recommendation for low gain output stage
  233. Help identifying OPT
  234. Getting Started On RCA Console I picked up
  235. Er, what's plate voltage?
  236. 6SN7 DIY preamp suggestions
  237. Hybrid 5.1 SURROUND Tube preamp/Mosfet Amp
  238. Where is the problem in 211 tube power amp.
  239. An Unusual SE Bench Amp
  240. HK A500 restoration log
  241. How many grid stoppers do I need ?
  242. Bogen Console Revamp
  243. Anyone guy with experience in turret cascode TV tuners
  244. Phono stage with remote transformer?
  245. Need help troubleshooting Yamamoto A08S Kit build :-(
  246. Curcio Audio status
  247. Thorens AZ-25 restoration
  248. Question about slew rate of CCS for cathode bias
  249. ASUSA K2003
  250. Good Gravy, This Thing Is HUGE!

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