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View Full Version : Tubes / Valves


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  1. buyer beware
  2. JJ 5y3S pin 1??
  3. My first Sansui AU-111 Rebuild
  4. Capacitor-induced distortion
  5. Elevating Heater Voltage with multiple Transformer Heater Secondaries
  6. Common Cathode as DAC output
  7. Pre-Amp with russian tubes 1j24b
  8. How to calculate, the output impedance of a tube with grounded grid
  9. How To Draw Load Line With Output Transformer ?
  10. Inter electrode capacitance.
  11. My amp is an oscillator !
  12. TESLA PL509
  13. What value for Va ?
  14. Help selecting an input transformer ?
  15. Should same valves grid voltage vary much ?
  16. Driver options for 300B-XLS (4P1L-IS-4P1L-IS)
  17. Restoring a Scott 299-B
  18. Latest project, 80 watt valve amplifier
  19. PP Amp Doubling Output Power
  20. Setting up a Wilson current mirror as a differential load
  21. interested in tube amps
  22. Baldwin 45P amp project
  23. DIYGene's Jadis JP-200 Preamp Kit
  24. Need design/schematic for 6H30P driven 6C33C SET
  25. Substitute 6AQ8 for my 6CG7's
  26. 6bq5 tubes in a Heathkit AA-151
  27. Marantz 8b restoration: colour code, prints, schematics
  28. Show me your screen drive circuits
  29. Potting Compounds
  30. Chokes in the ground "plane"
  31. OTL idea
  32. Balance control tip for newbee's
  33. Ebay win - is this any good?
  34. 6sn7 pse amp for altec lansing 604E
  35. "Cockeyed Bridge" with damper diode?
  36. Mac 2100 Hybrid
  37. Single-Stage Hybrid Cascode Power Amp
  38. New to Tube amps, heathkit question
  39. 6AS7 OTL PL build
  40. On Bootstrapping diodes for UL G2 MOSFET
  41. Chasing Aikido "hum"
  42. valve monobloc designs
  43. 7A5 is a good driver for the 300B ?
  44. Parallel Push Pull 6V6 design
  45. Soundstage
  46. Brains & Brawn CF : where's the catch ?
  47. ISO-TANGO to quit
  48. Shifting reflective loads using secondary taps?
  49. VTL -- 20 6550's a side and their xfmrs
  50. "Diamond" tube preamp with 12au7
  51. Wich factory made this tube ?
  52. Bootstrapped Cathode Coupled Amplifier
  53. OTL 6AS7
  54. Diode performance testing
  55. Monacor SA-10
  56. Volume Control Hum
  57. Stromberg-Carlson AP-50
  58. 5 wire and 3 wire output transformer change ?
  59. Yaqin mc 10L
  60. Can OTL Ciclotron amp use solid state regulated PS?
  61. Cross-channel overtalk with strange effects
  62. Why 6.3V?
  63. KT88 Williamson Design Questions
  64. Winding a center-tap secondary
  65. HV delay switch
  66. McIntosh MC-30...Balanced Input Feasible?
  67. Designing line driver / pre-amp
  68. Bucking and boosting a tube power transformer
  69. 33A-158M
  70. All DHT integrated amp
  71. 6N1P
  72. basic query - Pete Millett 807 board.
  73. "Fritz" the Boston/RI tube guy - ANYONE know what became of him??
  74. EI yugoslavia gone forever.
  75. Quicksilver 8417 Design - Stay with it or modify?
  76. Looking for some advice on odd preamp noise issue
  77. Tubes in an opamp feedback loop ?
  78. Jensen P-P Cathode Follower
  79. Cathode follower rigorous definition.
  80. Little Bear P3 ?!?! opinions ?
  81. NOS GU-81
  82. OPT endbell color!
  83. Music Angel kt88 with unbalanced output.. help me!
  84. Heater Supply Center Tap
  85. SCA-35 Pot noise
  86. Conrad Johnson MV 55
  87. Comments on 6C33C-B ARG OTL
  88. Construction tips for high voltage amps.
  89. 6L6 bias
  90. came across Mingda Tube king mono blocks
  91. a lot of noise
  92. El84 pp Amp problem
  93. Power on filament current surge question
  94. Its likely a repost but W/e
  95. Scored some 8236's....
  96. What causes valve to glow red inside ?
  97. Tubes and radioisotope decay
  98. PSUDII Question
  99. DIY Bias Buddy
  100. Recommend me a high power OPT
  101. Design Shorting Tubes?
  102. Microsoft Tube Amp and Speakers
  103. S5 K-16LS Tone Control - Help Please
  104. SEUL Circuit for PL519, has anyone here built this?
  105. Motorola three channel
  106. Your own builders book
  107. WE91A - high frequency roll off
  108. Dynaco MarkIII dimensions
  109. Leak TL12+ smoothing capacitors.
  110. Question about failing 6550 output
  111. Need help converting Ampex 960 R2R to a preamp...
  112. 5751 SPICE Model -- for Poddwatt II
  113. Configuring an Audio Transformer for 8 Ohmsuring
  114. OTL Blocking cap / RC filter
  115. What do you think..OP Tx
  116. Does anyone have GA399MA.pdf?
  117. New Amp Build, First Post
  118. Twisting HV leads
  119. Phono MC/MM Stage like Audio Space Reference Two RIAA Section
  120. Why use a pentode?
  121. Filter choke temperature concerns
  122. Is my output transformer damaged?
  123. Parafeed without a cap
  124. Edcor Transformer Problems
  125. From The Daft Idea Department
  126. Do I need a resistor between plates? pic included.
  127. Tube preamp overheating characteristics?
  128. Valve amplifier sounds great
  129. volume pot hum at low and high volume
  130. Thank You
  131. Help Needed ;)
  132. Mullard EL-34: new vs vintage
  133. A new IC for monitoring tubes
  134. 6L6 transformer on EL84
  135. Output transformer design
  136. Tubes4HiFi preamp questions
  137. Newbie advice - Phono Preamp/1st electronics build
  138. Got a HeathKit, now what to do?
  139. 4P1L push pull amp with Lundahl zero global feedback
  140. 12AQ5 SE Amp Issue
  141. ISO a motorboat
  142. Tube characteristic - Originates from pre or power amp tubes?
  143. swapping console amps...
  144. swapping console amps...
  145. Hum issue in PAS Aikido
  146. Hammond Transformer Warranty
  147. 6CB5 in triode PP?
  148. Input capacitance when tube is not conducting
  149. What would you build with these output transformers?
  150. Need help with new tube for my amp
  151. Does the method for loading the plate affect gain of the stage?
  152. Slightly Sick Amplifier
  153. OP Tx for signal tubes in Headphone amps
  154. need mac kit 30 transformer
  155. Is this transformer saturation? (pictures inside)
  156. Did I use the LR8 in this EF86 preamp correctly?
  157. Who recognizes the chassis of this amp
  158. Sweep tubes in Push-Pull-Parallel
  159. EZ125 Quad KT88 Project
  160. Need a help! OPT design assistant software
  161. Ready To Build the Other
  162. Harman Kardon Citation II
  163. Relays for tube voltages
  164. Okay, Can someone suggest if this PSU can work
  165. ELROG 211 and 845 tubes
  166. Has anyone tried this tube preamp
  167. filament choke testing
  168. Grounded-Grid MC Head Amp for 2x PC900 and Lyra Delos
  169. output transformer sizing - is there such a thing as to big?
  170. Advice for dummies...from a new to the forum dummy
  171. Counterpoint Tech
  172. Line Magnetic 211-IA: Schematic?
  173. Help with harmon kardon a50k
  174. anyone ID these Magnecord amplifiers?
  175. vintage vacuum audio site
  176. Hiraga preamp line+phono 4xECC81 SRPP
  177. Why no simple 2-stage EL34 PP amps?
  178. Dynaco MKIII mod
  179. Blown Up Sir...
  180. Leak stereo20
  181. FFT Hanning Data
  182. Elevated Filament Question
  183. what do you think about this lv linestage?
  184. PCM1798 ECC83/EL84 PP UL balanced combo
  185. I am Trying to Design this Darling Amplifier
  186. Real power pentode recommendation
  187. bridge with CT: can I do that?
  188. Who makes nice pc board for tubes ?
  189. pse300B
  190. 1948 Wireless World - 50 Watt Amp
  191. Akido preamp suggestions.
  192. 6CM5 MKII
  193. DC coupled 6P15P
  194. Switchable 45/VT-52 Amp
  195. Optransformer for 6B4G?
  196. OLSON TUBE AMP AM-158
  197. 6922 preamp idea
  198. Tube SPDIF output
  199. One power tube going hot at idle
  200. schematic to learn by
  201. Audioromy schematic
  202. 8236's
  203. Need a 4060 model on LTSpice
  204. vt86pp 6v6
  205. SALAS hv with 150V
  206. Aikido 12Vac
  207. Looking for expertise in adjusting Williamson amp
  208. Help with elevating a heater supply
  209. Preamp EQ
  210. Need help identifying this amp
  211. Phillips FX737A Rectifier
  212. wiring a transformer on a Scott 299
  213. DC/DC stepup for valve projects
  214. 807 SE Amp
  215. Stromberg Carlson ASR 220C blowing fuse
  216. EF806 pentode + CCS
  217. Transformer Identification
  218. Heathkit AA 121 parts
  219. Conrad Johnson PV-8: how to convert 110v to 220v
  220. Help me understand Edcor wiring?
  221. Another paralleled to single push-pull EL84 mod.
  222. Sca35 tone controls
  223. Tube preamp noise
  224. Fountek Tube Amp
  225. Choke & Transformer Positioning Problem
  226. The adventure time tube amp- Did any catch it?
  227. Input wiring question
  228. Let's talk triode-pentode
  229. Tried failed, looking for suggestions
  230. Need HELP converting Bogen MX30a pa into a preamp for recording
  231. Edcor Wrong Transformer...
  232. 812A Build
  233. Still not sure where to start
  234. Will cooling fan extend life of old caps & transformers? Or just make worse w dust?
  235. RCA tube amp woes/hum/ground
  236. EF86 microphony
  237. John Broskie Kits
  238. Refurbish Conrad Johnson Premier Eight
  239. 4tube Philco amp project...
  240. Thoughts on bias for PPP
  241. 2012's Acquired Parts- ..Custom Build Anyone?
  242. Can I use a variable voltage cieling fan switch as a variac?
  243. Audio research LS2 hiss and hum... need help
  244. saba electro sound
  245. Ra on C3g and 6C45pi?
  246. Partial Feedback System
  247. An Electronic Loss Compressor
  248. K-12g one channel louder than the other
  249. Sun SV2a3 or 45?
  250. Red imP(asse)

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