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View Full Version : Tubes / Valves


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  1. CCS assisted small signal UL pentode
  2. Vox AC50 output transformer rewind
  3. Dynaco ST35 B+
  4. Simple Tube Amp
  5. Portable tube amplifier
  6. Using the heater supply to get a DC source
  7. phono/aux switching problem
  8. What is the best EF86 in production at the moment
  9. 12AX7 / 12AT7 Mu Follower Phono
  10. Kreisler Stereo 6 speaker impedance
  11. A serviceable life.....
  12. TV 7 DU Tube info
  13. Twinings Tea Transformer Covers
  14. ECC88 with 12V heaters
  15. CXhange opa 627ap for an audio gd moon ?
  16. PP-EL34/6550/EL-PL504 or KT88 Bal. innput
  17. fatman itube mk1 sounds bad
  18. Chinese FD-71 tube is the russian GK-71 ?
  19. Leak stereo 20 diagnosis
  20. VTL
  21. Looking for tubed MC pre-pre
  22. Correct wiring types
  23. Couplates
  24. Op-Amp Like Line Preamp
  25. SE GU-50/6CB6 Pentode Design
  26. Pioneer SX34
  27. About metal film resistor in a tube tuner
  28. Looking for 52dBs or more MM phono
  29. Winter is coming... Time to start GM70 SE parafeed amp
  30. Doug Self: Wireless World Magazine Article Archive
  31. Relay short circuit
  32. EL34 PP oscillating
  33. Dynaco switchable diode/tube rec and driver tube mode
  34. CCS into a VR with Interstage question
  35. 6SN7-6V6x2 DC coupled 2 stage with stacked supplies
  36. Rectifier and DC filtering relationship question
  37. Class A2 6JD5 Curves
  38. Motorola HS-839 Amp problem
  39. Active valve monitors?
  40. Did I get this load calculation right?
  41. Convergent SL1 original schematic
  42. Bleed down resistor
  43. How do I calculate resistor value in this schematic?
  44. Easy question about tube data sheet
  45. Tube regulator question
  46. Tube amp build for an 1st timer.
  47. Full music 101d input tube/valve
  48. EZ80 Voltage Question
  49. What the heck is this? Bulb?
  50. Audio Note Kit 1 Upgrade
  51. Will this work? (EL34 PP)
  52. Anthem 1 intergrated amp
  53. Tubes and the sun?
  54. Two triodes cascaded cathode follower?
  55. HIRAGA PREAMP PHONO + line
  56. OB2WA Radioactive???
  57. 9 pin tube socket pcb boards with screw terminals
  58. Hai I need a little help on designing a power supply
  59. Tesla E83CC Frame Grid Tube Purchase - Legitimate Production or Fakes?
  60. Cleaning Up the Noise + Selector Switch Anomalie
  61. first tube preamp
  62. Rescuing a vessel : 1964 HICKOK 539C tube tester
  63. Dynaco Feedback
  64. Mundorf Silver Oil in hot 300B tube amplifier !!
  65. MULLARD 5-20 build with mods
  66. Choke loaded driver with small opt?
  67. Preamp Tube Bias and feedback
  68. Capacitor replacement option
  69. New EL84 SE Amp PCB: The u-SE
  70. Question about Amp Theory
  71. Help needed for modifying DAC-opamp-tube circuit
  72. best way to start with tube amps
  73. Damper diode between C1 and L1
  74. Question about 'near' zero volt bias for low level stages
  75. Filmosound 179 - Should I even bother?
  76. Newbie question
  77. I think I know how it works, but can I get some help? (OddWatt PP)
  78. kt150
  79. As anyone considered black oxide???
  80. OTL question
  81. Headphone amp/preamp project.
  82. Comments or suggestions on this schematic?
  83. Twin Conn Organ 7868 Rebuild
  84. Favorite PP 6550 schematic?
  85. DECWARE Z BOX SCHEMATIC
  86. 6V6
  87. Need suggestion for eliminating noise from aluminum cover
  88. Kuba Serenade Stereo Console question.
  89. Help with tube interchangeability
  90. 6sn7(12au7)-6v6-300b
  91. Westinghouse tube amp MODEL V2508, conversion
  92. Voltage on the chassis, bad xformer?
  93. TubeCad blues...
  94. OPT as PSU filter???
  95. Tube Plate Voltage Timing
  96. Transformer grounding
  97. Two questions concerning bleed resistors
  98. Choke ratings and resistor values in choke input supply?
  99. Novar Spud :: A $200 sweep tube Spud with PCB
  100. Mid 50s 250/500/1000W Valve amp needs some repairs......
  101. I want to learn tubes and set up a workstation
  102. Pre amp wire up__new
  103. allied knight / rauland borg schematic needed
  104. Rollable Tubes
  105. n00b - Leave out the LEDs??
  106. Aikido 5687 all in one kit
  107. 6P13S - WHAT TO DO WITH
  108. el84 set amp for 90db-8ohm speaker?
  109. My first cap coupled 2 stage
  110. Dodd Buffer Tube Rolling?
  111. Lowest THD Tube Design Possible? (Need for a class, I realize it doesn't matter)
  112. Olson-Morgan 6F6 Amplifier Info's needed.
  113. Newbie, Help with datasheet
  114. Conrad Johnson MV55 again - and Hi from a newb
  115. Interesting one piece EL34 PP tube amp diy pcb on ebay
  116. Low power stereo (dual mono) tube headphone amp
  117. 6EJ7's vs. 6JC6A
  118. EL34s Frying in my Cayin A50-T
  119. Grid Leak Amplifier with Unexpected Heater Resistor
  120. 7617 tube data
  121. preamplifier with huge amplification
  122. Counterpoint Amp Output
  123. Phase inverter Gremlins in Philips EL6431 amp
  124. Russian to English Translation needed
  125. Concertina type Phase inverters?
  126. Double C-Core output transformers
  127. Amplifier slew rate and DSD playback
  128. Bypassing volume pot on Cayin integrated tube amp
  129. Distortion when change into ecc83
  130. Mighty Midget Problem (One channel is louder)
  131. Mullard ECL86 3W Economical Amplifier
  132. Building a Baby Huey EL84 amp - might need some pointers
  133. Tranformer Choice
  134. Heathkit WM-5
  135. Aikido preamp power supply
  136. identify this traffo
  137. transformers
  138. parallel tube amplifier.
  139. What to do with a 12" x 8" enclosure?
  140. Odd filament winding
  141. transformers
  142. tube choices for an ST70
  143. "Arabella" - 6EM7 amplifier on Acacia
  144. CDE acquisition of Orange Drop Brand
  145. What is this inductor?
  146. Counterpoint SA-5000 upgrade
  147. Homebrew tube preamp noise
  148. Cathode follower with 12ax7
  149. CPC Japanese Tubes ?
  150. Cary SLA-70 with KT88 - worth building?
  151. Opinions or comments on schematic please
  152. Is this a tie point or a diode?
  153. Need Pinout Help, Silvertone Organ Amp
  154. Pushing EL36 ??
  155. Power Supply Chokes Question ?
  156. First Post, Viking/T Eaton co Tube Amp Issues! *Pictures*
  157. Knight 40 W Amp. tubes correct? Location?
  158. Push-Pull Output Transformer with Cathode Feedback Winding?
  159. 300b amp help
  160. Help with Dynaco value
  161. INTERSTAGE 2A3/211
  162. TCJ Push Pull Amp Calculator question
  163. winter project KT88 PP
  164. En Vogue Darling SRPP SE SRPP tube amp will this work?
  165. Shunt regulation for HT
  166. Unison research simply two, what gridvoltage for EL34?
  167. Finally Measured my Tube Preamp
  168. Aikido octal stereo problems
  169. Philips 5 pin IEC connector in AG9016
  170. Dynaclone OPT replacement - less power than expected
  171. 2 ECL 805 SE
  172. All DHT headphone amp with 4P1L & 307A
  173. cary audio rocket 88 tube amp
  174. Compactron Driver Dynaco MarkIII PCB Design.
  175. Paralelling pentodes ?
  176. KT120 Single Ended Ultralinear
  177. Does a PCL805 glow red at its maximum rating?
  178. V1 Noise Reduction Choices
  179. full pentode ppp
  180. Input transformer question
  181. Is this Tesla ECC803S real or fake?
  182. Michaelson and Austin TVA-1
  183. EN VOGUE DARLING SRPP SE PARALLEL 1626 REVIEW NEEDED
  184. 6EB8\6GN8 P-P Output 2*12w Class-B
  185. B+ regulator for KT88 amplifier
  186. Help figuring out wind/hiss
  187. 12A07 low voltage preamp
  188. Buying guideline for 6c33c
  189. New 211/VT4c shootout
  190. GM70 Output transformer
  191. OTL 2013
  192. Octal Preamp Triode Thoughts (IDHT's)
  193. Wrong tube and pin wiring
  194. New Production Tube If Transformers from Germany
  195. Vishay TX2575 resistor placement
  196. Direct connected madness
  197. RH84 build & quite a few questions...
  198. Tube preamp kits
  199. Capacitor query L1 audio innovation pre-amp
  200. Someone Told Me This Wouldn't Work?
  201. How to "do" a FM Multipath Monitor
  202. EF86 pins 2 & 7
  203. Welborne 300B DRD amp
  204. My First Tube Project: 6N16B
  205. Triode mod with G2, G3 connect to anode
  206. Valve mic cable diy
  207. Toroidal transformer is bad
  208. Coupling caps suggestions
  209. EABC80 and the double diode triode?
  210. Frequent Question -Golden Tube Audio 300B monos schematic??
  211. Transformer Terminal Designators
  212. Slew rate limiting in output stage
  213. Sonic Frontiers Line 2 - no line level output
  214. KT88 Ultralinear?
  215. Help with 12AT7 CCDA - EL34 SE Amp Design?
  216. THE FINAL AMP
  217. need 6SN7/6H8C reccom. for amp
  218. 211 parallel amp (made in Iran)
  219. Changing to twisted pair heater from one side grounded
  220. Choke input supply. Cap question.
  221. tube rectifier 6AX4GT
  222. RS1003 triode mode Spice models
  223. Firestone 6V6 Monoblock Problems
  224. Lundahl Output transformers?
  225. GMI-6 / GMI-6-1
  226. New power transformer for Millett's DCPP amp,now available at EDCOR
  227. Tuned Circuit?
  228. remote lead for tubes
  229. Building a Stereo EL84 auto bias PP tube amp
  230. Tube conversion of differential to single ended signal
  231. A transconductance tube amplifier
  232. Unknown Tube
  233. 12vdc to 150vac
  234. When is a tube too weak?
  235. The Best Way To Separate L+R and Driver/Output Tube Power Supply ?
  236. Biasing aBerning EA-230
  237. Aikido Noob - Please Help!
  238. Wiring Capacitors in Series
  239. Dynaco ST35 power transformer
  240. sunn 200s diagnosis?
  241. Individual Coupling Caps
  242. Valve Pre > Intergrated amp
  243. Whats the difference RH84 or Mullard 3-3?
  244. Ultra-Linear SE EL84?
  245. Self balancing pp using ccs question
  246. Help: How To Select Schottky Rectifer Diode
  247. 6550 plate resistance in triode mode? Calculate?
  248. making 6sj7 have same gain as 6sl7
  249. Thick Film resistors?
  250. Mounting position EL84

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