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View Full Version : Tubes / Valves


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  1. 6v6 vs. 6l6 vs. 807 soundwise..
  2. Opinions/Advice on Triode Strap method
  3. Something like a Miniwatt N3 or APPJ PA0901A
  4. Extraordinary harmonics. Type 47 # tube amp.
  5. Made a new tube amp, 6J5 +27 +45
  6. Anyone ever play around with a GU-72?
  7. Possibility of using a UTC LMI-500 transformer...
  8. Aikido transformer
  9. Can someone explain why you need to re-adjust the balance on a tube amp every time
  10. Which factory made these tubes ?
  11. 813 and gm70
  12. 13E1 Push Pull
  13. dump find.
  14. ...6SN7GT operating points tube help.......
  15. 6L6 6SJ7 Amp please pick faults if any
  16. Updated DIY EL34B 6SJ7 SE Amp
  17. 6C18 x 6C33
  18. Vintage tube amp find
  19. any benefit to screen-grid drive a 6V6?
  20. Brown face Scott LK72
  21. Pilot 1060 integrated - make it better!
  22. Should I ground my K12G or my Bugle 2?
  23. 6c33 amp convert to 6c41
  24. STA-LEVEL thumbs problem
  25. Amp motorboating at power up
  26. Spice models for AL4 and RS242 tubes
  27. Mains Switch
  28. Suggestions for big output stage needed
  29. Very Good (or best?) 12B4 schematic?
  30. Amplifier for active bookshelf speakers
  31. Olson AM-240 schematic needed
  32. Valve amp - maintenance
  33. Your opinion about Rotel 930AX to hyrbid mod
  34. Weston Tube Tester 774-5
  35. Tube circuit sim software for free?
  36. 6v6 family tubes
  37. Troublesome bias resistor, cathodyne stage
  38. 6AQ5 excellent for line stage?
  39. Datasheet 6P42s and 6P45C
  40. Quad / Cyrus impedance matching
  41. Zobel network at primary audio trafo?
  42. ECL86 question
  43. 500c buzzing power transformer
  44. LM4702+6L6GB/807
  45. TubeAudio Mixer Blog
  46. Finally started on my 6L6 amp. Need tube suggestions.
  47. Just another Scott thread
  48. Design for overdriven output stage
  49. Seeking Articals On Audio Transformer Design & Construction.
  50. Bias el34 pp
  51. Photo Gallery.
  52. Precision S35
  53. 6L6WGB
  54. 6BQ7A Driver
  55. Advise for Simpson 340 signal generator problem
  56. Armaco TTHF or Calrad AP 15 What to do What to do?...
  57. Screen Power and Warmup
  58. Wanting copies of Prof. Alexander Bereskin's transformer winding pictures.
  59. what's the brand of this capacitor sounds great ?
  60. Edcor CXSE25-8-3.2K or Transcendar TT-017-OT?
  61. PP 2A3 Fixed Bias
  62. RL12P35 convert to el34
  63. Statistical regulator from VA 4rd edition
  64. Matching Impedances (the Math behind it) Please Advise if you have a grasp. Xfmrs etc
  65. Help 6AQ5 pushpull
  66. HV Logic Control Approach
  67. Valve heater question
  68. Phase inverter adjustment - Fisher 80AZ
  69. Repurposing a Bogen CHB-35A
  70. SMPS
  71. Interstage and bias failure
  72. Grid 2 current for GU19-1
  73. 6x5 tube
  74. IT coupled 6BG6GA
  75. Mystery noise has got me baffled
  76. Dynaco PAS: too much liposuction?
  77. LP Tape Noise
  78. YAKOV ARONOV MA-100
  79. Help for balance-tone control-mode selector bypass
  80. Design of transformers for valve amplifiers
  81. Opinions please: seeking a first class DIY SET amp design
  82. PSU for 6N6P
  83. HOT B+ capacitors!
  84. Analog meter monitoring HT supply
  85. Lamm LL2.1 DC Offset problem
  86. 6L6GT/6SJ7 Valve Amp DIY
  87. BHExchange for BottleHead's
  88. 6BY5GA elevated heater question
  89. Tone controls
  90. EL84 "IP" questions
  91. KIT Single ended KT88
  92. HELP needed - LEAK Varislope 2 Stereo + Stereo 20 with pictures...
  93. All tube cap tube amp?
  94. 12AX7 preamp for DAC
  95. Grid resistors -> GND
  96. OTL headphone amp distorting & clipping: weak power supply?
  97. Broken bias resistors (Yaqin MC-10L)
  98. Tube Enclosure suggestion from Europe.
  99. Benefit/SQ of tube stage at the input of ss power amp
  100. Is 6907 and QQV03-20A tubes are same?
  101. Found some chokes
  102. 6SN7 at low plate currents
  103. 12AU7, 12BH7, Darker Less Bright Option
  104. Heater current effects
  105. Not using all the sections on multi-section cap
  106. DC heater supply dies on me
  107. 1972 Leak Varislope 2 Stereo
  108. OPT secondary ground, stacked supplies
  109. OTL for HeaPhone
  110. Voltage doubler and filament supply
  111. Please suggest me a 6V6 class AB amp
  112. Need Review of wiring up of this SRPP 6AS7 tube amp
  113. Hum in a triode 1H6G...help !
  114. 40w Class A PP KT66?
  115. My new small amp EL84 SE Triode
  116. tube preamp output impedance
  117. pete millet 807 amp
  118. Lost Negative Bias-Fixed Bias
  119. Aikido ('dead quiet') output impedance
  120. Looking for lineamp buffer schematics
  121. Nagra VPA 845
  122. How to match 6C45?
  123. Yet another question about cathode bias (led+pnp)
  124. Ideal System for 1960?
  125. What replaces an IN541 diode?
  126. Bottlehead Eros or Tube4Hifi PH16
  127. Psvane 2a3 T Mk II reliable vender
  128. Odd Wima cap markings
  129. Chinese Amp kit experience
  130. Considerations about headph. OCL
  131. Trying to solve a Plate Follower Problem
  132. Nichicon Caps
  133. Footprint Noval ECC83 Altium
  134. Interference in hybrid amp
  135. wiring DHT filaments with center tapped secondaries
  136. B+ of Curcio Daniel II
  137. Stepped Attenuators Questions
  138. Noisy Ground? (Probably not a loop)
  139. New Production Telefunken
  140. Tube horizontal mounting position
  141. "Ask Jan First" parts website in Germany
  142. EZ215 Stereo 5881 Amp Project
  143. CCS help dn2540 send 340v to the chassis
  144. That's What She Said RH84 Build Log
  145. Help figuring out this output transformer.
  146. 5881 PPP Cathode Bias B+
  147. Measuring DHT filament V with minimal effect.
  148. 100hz hum with Audio Research vs-55
  149. Volume potentiometer
  150. Driver for 2A3C
  151. Regulated B+ sounds worse?
  152. Sylvania console amp rebuild...
  153. E130L Micron
  154. Question Re: Ground Loop Breakers
  155. Source for D3A/7721?
  156. ID a salvaged choke
  157. Magnetwire gauge size converted to metric
  158. ccs what is the best way
  159. parafeed test/measurement setup question.
  160. how do balance pots work?
  161. Issue with parafeed in SPICE
  162. GU-50 Dissected
  163. Need help on ground wiring for Scott 222-B
  164. Heathkit A9-C Mod
  165. Need a 240v, 5vac - 6-10A rectifier transformer
  166. Free Canadian Westinghouse Receiver #101: Super Heterodyne
  167. 6AS7 SET amp discussion from Photo Gallery
  168. DHT 100hz hum
  169. HP 8903B and Pete Millett's Software Problem ?
  170. How to identify an ARC D70 version ?
  171. Valve amp first build - questions
  172. Transfrmer Impedance Question
  173. Disappointing results from RH84
  174. Anyone Loose a Counterpoint SA-5000?
  175. Installing a 610 in to a B&K 500
  176. My first tube preamp (4S)....
  177. Recycling old iron with stiff wires.
  178. 6EM7 as driver... help !!!
  179. changing R1 value in SE amp
  180. Heater CCS makes for low voltage
  181. DHT & Indirect on same line?
  182. Which tube preamplifier kit for LM3886 amplifier?
  183. budgie pre-amp
  184. ecl82 class A pp, need schematic
  185. Input low pass preferred method
  186. cary SLP50A
  187. se output options for single/balanced tda1541
  188. FM noise in Fisher 90-T in FM mode
  189. ST Triodes?
  190. TUBECAD SE.
  191. RH84 build with SS recto and voltage doubler (any input?)
  192. Tube identification
  193. Brand new cap overheating - argh
  194. High Power Valves
  195. Tubelab SSE B+ and cathode resistor questions
  196. HIFI world 6080 se
  197. EF86 triode question
  198. Connecting a Headphone Jack to a Preamp
  199. PSE 300B "French connexion"
  200. Making a custom tube characteristic graph
  201. 300B DRD power supply
  202. Insanely High Common Mode Voltage Shunt Measurement
  203. Heathkit AA-151 troubles
  204. Tube Power supply question...
  205. Noob question on power transformer primary input voltage
  206. Dynaco ST35 testing for a blown power transformer
  207. 6n6p tube buffer
  208. Welborne Labs
  209. GU-50 triode
  210. Help track down noise in gyrator
  211. Earphone Amp Improvements
  212. Protecting Wire
  213. 45 SET : tubelab vs get*set*go vs ?
  214. 6SL7 in Maggy 175 amp...
  215. Heater soft start for series-connected preamp valves
  216. low/no gain follower
  217. Data for 6BD2A or 6BD2
  218. isolation test
  219. Western Electric 437A preamp
  220. solid-state rectrification
  221. Class AB
  222. push-pull
  223. Need help ID tango-lookalike transformers
  224. TV Valves blast from the past..
  225. Tubes suggestions for parafeed headphones amp ?
  226. CCS Loadline
  227. Universal pover supply for ECC85 EL84
  228. Conversion Project
  229. Dynaco PAS I/O PCB Grounding
  230. CCS for anode load
  231. OTL Power Supply: Halfwave vs Virtual Ground
  232. Can NOS tubes have emission staining on the glass?
  233. Pentode pre/compressor (warning nube attempt at circuit drafting) --suppressor grid
  234. Capacitor Drain for Tube Bench Power Supply ?
  235. Diodes, diodes, diodes...
  236. Grid leak resistors and dc-coupling
  237. Output transformer at speaker?
  238. Newbie just wondering if this PP amp looks ok
  239. 6P36S push pull HiFi amp
  240. Another Output Transformer Wiring Question
  241. Cathode bias for EL84 PPP
  242. Output Transformer Wiring Question
  243. NJ7P Tube Database
  244. solving my old radiogram sound issues - help
  245. 6H9c Idle Current.
  246. 12E1 SE amp suggestions.
  247. Direct Coupled Output Stage, DC Bias Balance
  248. Pre-amp tube suggestions for 2A3 output tube
  249. AirTight ATM-1 Schematic
  250. Counterpoint SA 5000 Service manual and PSU

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