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View Full Version : Tubes / Valves


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  1. Universal hybrid triode-mosfet input/drive stage
  2. IT coupled 1624 or 807 amp
  3. Raytheon / Western Electric JW-5755 / 420A
  4. Calculate unknown operating point from known cathode resistor
  5. 5763 triode curves
  6. HICKOK 539a QUESTION
  7. Constant current heaters
  8. max G2 voltage 1624 tube (Tabor)
  9. Need reference for Dynaco MKIV amp build
  10. Biasing Valve on Bipolar Power Supply
  11. Tubelab sse choke input 6v6
  12. $1800 tube amp
  13. Testing a 6N3 5670 etc on a B&K 600 tester
  14. Could anyone shed any light on this amp for me?
  15. Translation Russian EL84SE design please?
  16. Determining plate and screen voltage
  17. I Don't want to set the forum on fire . . .
  18. Valab Ultra Low Noise Regulatible
  19. Westinghouse 6973 Tube
  20. Which is worth burning or keeping
  21. OPT position
  22. Remove volume pot
  23. Headphone amp ideas?
  24. Good Looking 6SN7
  25. UTC Transformer
  26. Cap substitution help
  27. Edcor replacement for w5m peerless opt
  28. No Feedback Balanced Line Design
  29. KT120 PP - "low power" baptized Vitruvian amplifier
  30. Hovland Sapphire guidance needed
  31. Question about specialized OPT
  32. My first build tubelab SE
  33. k16ls tube amp on/off switch?
  34. SY Tube Phono Improvements?
  35. Tube newbie, anyone familar with s-5 k-502? Help needed please
  36. TVA-1 Michaelson & Austin with problems
  37. New to HIFI tube need advice
  38. Crosstalk between Triodes in Dual Triode Tubes
  39. 6L6GC instead of EL34
  40. Schade feedback and CFB
  41. Sansui AU-70 - Help Needed
  42. Pentode C.F, where to connect the suppressor grid ?
  43. Separate PSU for PP EL34 / 6SN7GT integrated amp
  44. Simple SE driver with mosfet (6sn7/307A) IRF820
  45. Is it safe to run pentode w/ no screen voltage for a min?
  46. Low B+ and CCS question
  47. Has anyone ever used slate in audio?
  48. Semi-Fixed Bias?
  49. Transformers MIC and Phono
  50. 6L6GC...More Voltage...or More Current?
  51. help me
  52. Anybody built/heard Melquiades amp
  53. Elevated grid bias
  54. Oscillation found in Luxman LX33
  55. RCA phono amp project
  56. Test of 45 Triode with EICO 625?
  57. Standard Silicon Diode Rectifier's VS Ultra Fast
  58. Output Transformer for L3 pre Audio Note
  59. "Boosted" Triode operation?
  60. 6HB6 UL push pull amp
  61. Interstage transformer ratio, spacecharge tubes in PP
  62. 6N6P line stage
  63. Revamping Tube Amp Monoblock - capacitor grounding concern
  64. 845 set bias.
  65. How to improve on a working Hybrid Amp: 832A Tube with MOSFETs
  66. tube outputs
  67. Coupling Cap Consistency
  68. Volume adjustment on 8ch at once
  69. Sub minature tube gain stage question.
  70. DHT PSE 2A3
  71. Plate voltage mic pre
  72. Estimating load for Duncan Amps PSU tool HOWTO?
  73. Shuguang Treasure Series 300B-Z not satisfactory!
  74. Choosing OP of small signal tubes with CCS in the cathode
  75. Aikido help needed
  76. Exploding 300B
  77. power output of EL34
  78. 76 tube into C3M (triode) via LL1660 to PP output stage
  79. best operating points for e182cc tube
  80. Any thoughts about this volume/bal arrangement
  81. Filament tension spring material
  82. DC coupled SE Schade amp
  83. First build 6V6 based
  84. Failed Converting UL to Pentode!?
  85. 1955 kids record player hum puzzle
  86. subwoofer output from my tube preamp
  87. EL84 SE Amp - specific transformer
  88. "GOOD" backup KT-88
  89. New or Old Output Transformer?
  90. Motorola console recap question
  91. Plate voltage on preamp tube too high
  92. Good valve design calculator website
  93. Ultra-on push-pull tetrode 6550
  94. My introduction to tube amps. The good, the bad, and the ugly.
  95. How do I calculate local feedback %?
  96. Newbie greeting & Resource
  97. Tips/Help With a Dying OTL Headphone Amp
  98. 6B4G and ECC83
  99. Maron buys a tube amp
  100. Newbie
  101. 845 AC filaments, my experience
  102. 8552 finals ?
  103. Low voltage 3W S.E. little amp, need comments and suggestions
  104. Single ended push pull ultra linear or?...
  105. Hello and questions about Magnavox SE amp
  106. Amp identification
  107. Millett DCPP No Output.
  108. using a Hammond 835 interstage ?
  109. Recommendation on versitile tube tester
  110. Mullard 6SN7GT
  111. RIAA tube pre amp
  112. Cheapo Ebay voltmeter
  113. Jolida SJ202a Schematic
  114. Tetra All in One Phono Preamp voltage
  115. Console pull advice
  116. Local feedback on IT secondary (PP amp)
  117. Is 6w enough and can i use phone power amp?
  118. Yaqin MS-12B preamp - how to get more gain?
  119. Inductor Multiplier Patent
  120. KT90
  121. 6L6GC Hybrid Partial Feedback
  122. 7868 to 7591a conversion help
  123. SOS! 21st Century Regulator Dead!
  124. Transformer Placement - To shield or not to Shield
  125. cap multiplier suggestions wanted
  126. Bridging stereo tube amp to one more powerful mono output
  127. Weird pentode connections
  128. My last S.E. amplifier (pentode driver + Beam Power Tube Ultralinear mode)
  129. Please help info UTC transformer
  130. ARC SP-6B Tube Heaters Glow Very Bright at Startup
  131. SUPER budget DIY tube amp - need help
  132. LEAK TL/12
  133. What decides gain of a valve stage ?
  134. 6AH4 Preamp..A great option for line stage
  135. Kondo M77
  136. 2C22 SRPP
  137. Resistor question
  138. Problem with X10-d as preamp
  139. Pilot One AA-410 1950s
  140. Measuring VAC on coupling cap
  141. Tube phono stage load
  142. ANUBIS - Another Tube-Transistor Hybrid Amplifier
  143. Panasonic HV Electrolitics
  144. Unison Research Smart 845 & dripping sticky goo!
  145. Seeking Danish help to locate two 1950's magazine articles
  146. Valve cruelty ...
  147. Re- calculating RIAA network
  148. Just another cool toy to look at
  149. sherwood s-5000 vs. s-5500 iv OPt's
  150. Sound of 300B SET by Satoru Kobayashi
  151. Using UL taps instead of the anode taps to alter inpedence
  152. Help fast please! Type 3 Ei KT90's - Pre or Post War? How do you know?
  153. 807 PSE schematic design need
  154. 3 direct coupled 2A3 amps
  155. Tube preamplifier with chip power amp
  156. and the quiz identify power trans continue
  157. Valve HT power supply common-mode noise
  158. 12AX7 and 6AS5 tube amplifier
  159. New hands-on tutorial for Tube Newbies
  160. Help me to choose tube "1 no ring" "2 has ring"
  161. Chinese board 6L6 KT88 is it worth???
  162. Valve Rectifier Testing
  163. Harman Kardon TA-120 Output Transformer
  164. Single ended transformer as pushpull?
  165. Resurrecting a nOrh SE9 Integrated Amp
  166. Fisher Amps?
  167. Repurposing an old Gulbransen Organ tube amp
  168. Help, the sound is silken or blow up?
  169. Now here's an idea - The DIYF QUAD
  170. Parallel output SE amp options
  171. What tube is equivalent 5879?
  172. Filament Xfmr: can I trade volts for amps?
  173. GU50 PP possible with this iron ?
  174. Hifi tube amps - overall sound
  175. Preamp grounding questions
  176. Tube rectifiers
  177. DIY PL84 + E180F
  178. McIntosh on How It's Made
  179. Choke input LCLC supply - question on minimum current
  180. EBC3 & CBL1 Tube AMP
  181. CLASS A HYBRID POWER AMP
  182. MXL V69 Mogami Edition signal cuts in/out
  183. Ultra-linear plate characteristic curve for EL34
  184. Need help to modify circuit to suit replacement power XFMR
  185. Line preamp schematic for 5GH8A wanted.
  186. help please - modify phono corrector
  187. Help me: Brimar 5Z4G, 5Y3GT is this an equivalent to a 5Y3WGTA?
  188. A Russian glow tube regulator with specs of 75V 60mA ?
  189. Help with filament for ecc88
  190. How much power transformer is necessary?
  191. testing the 300b tube
  192. Headphone amplifier outputs, so many permutations!
  193. tube footprint in Eagle
  194. Need VTVM repairs
  195. First Timer - DIY Tube Amp
  196. Help identify OT please
  197. gEDA and tubes
  198. Triode Electronics Issues?
  199. RCA BC5B consolette manual?
  200. Help with converting EL37 amp to KT66
  201. treadmill choke
  202. Preamp OPT
  203. Probleme with Volume Pot
  204. Simple SE 6L6 2 watt Homebrew
  205. is 6J32P equivalent of EF806 ?
  206. new tubes vs old ones
  207. 6p36s tube torture.
  208. Questions re: Bypass of B+ to differential amp
  209. Tube choice for yaqin cd3 buffer
  210. yesterday and today
  211. 260VDC need how much VAC transformer, is it 184VAC?
  212. preamp static
  213. Tube Line or Phono Stage bare kit
  214. Grounding of Hammond transformers
  215. Spud Amplifier with 6E5P Tube
  216. RAT Tube Tester build
  217. need a little help with identification
  218. aikido 12vac help needed
  219. Mullard 3-3 PCB
  220. OTL Using OPT
  221. VA/CF 6SN7 preamp input points?
  222. Copper losses in output transformers
  223. Yaqin MC550 Anyone?
  224. Bigger value output coupling
  225. DIY KT88 SEUL
  226. Leben CS300x feedback loop cap
  227. 6T8 / EABC80 as phase splitter / other uses
  228. Curve Tracer Screen Current
  229. Aikido Cathode Follower preamplifier with remote
  230. Grid Isolation in Fault Conditions
  231. Audio research ls2b parts list
  232. Heathkit USC-1 pre-amp
  233. Counterpoint SA3 Project
  234. Why such a high bias current on output valves ?
  235. how long before new tubes are run in ?
  236. Mullard 5-20 EL34 biasing
  237. Parallel Driver Tubes?
  238. B+ Regulators
  239. Looking for Cary SLP98 Tube Preamplifier Schematic
  240. Hirage Le Monstre equals my best valve amps !
  241. Ran a JJ6v6S at 37 Watts, is it damaged?
  242. Zener diodes as protection clippers
  243. KT120 upgrade from KT88 6550
  244. panasonic dc link capacitors
  245. PTFE covered wire
  246. Grounding Qustion?
  247. New high-Z 1:1 input transformer from Hammond (10k:10k)
  248. Tube amp wiring and temperatures
  249. Pete Millett's Uniamp
  250. 211 tube. more time to brake in or bad tube

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