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View Full Version : Tubes / Valves


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  1. Fisher Amps?
  2. Repurposing an old Gulbransen Organ tube amp
  3. Help, the sound is silken or blow up?
  4. Now here's an idea - The DIYF QUAD
  5. Parallel output SE amp options
  6. What tube is equivalent 5879?
  7. Filament Xfmr: can I trade volts for amps?
  8. GU50 PP possible with this iron ?
  9. Hifi tube amps - overall sound
  10. Preamp grounding questions
  11. Tube rectifiers
  12. DIY PL84 + E180F
  13. McIntosh on How It's Made
  14. Choke input LCLC supply - question on minimum current
  15. EBC3 & CBL1 Tube AMP
  16. CLASS A HYBRID POWER AMP
  17. MXL V69 Mogami Edition signal cuts in/out
  18. Ultra-linear plate characteristic curve for EL34
  19. Need help to modify circuit to suit replacement power XFMR
  20. Line preamp schematic for 5GH8A wanted.
  21. help please - modify phono corrector
  22. Help me: Brimar 5Z4G, 5Y3GT is this an equivalent to a 5Y3WGTA?
  23. A Russian glow tube regulator with specs of 75V 60mA ?
  24. Help with filament for ecc88
  25. How much power transformer is necessary?
  26. testing the 300b tube
  27. Headphone amplifier outputs, so many permutations!
  28. tube footprint in Eagle
  29. Need VTVM repairs
  30. First Timer - DIY Tube Amp
  31. Help identify OT please
  32. gEDA and tubes
  33. Triode Electronics Issues?
  34. RCA BC5B consolette manual?
  35. Help with converting EL37 amp to KT66
  36. treadmill choke
  37. Preamp OPT
  38. Probleme with Volume Pot
  39. Simple SE 6L6 2 watt Homebrew
  40. is 6J32P equivalent of EF806 ?
  41. new tubes vs old ones
  42. 6p36s tube torture.
  43. Questions re: Bypass of B+ to differential amp
  44. Tube choice for yaqin cd3 buffer
  45. yesterday and today
  46. 260VDC need how much VAC transformer, is it 184VAC?
  47. preamp static
  48. Tube Line or Phono Stage bare kit
  49. Grounding of Hammond transformers
  50. Spud Amplifier with 6E5P Tube
  51. RAT Tube Tester build
  52. need a little help with identification
  53. aikido 12vac help needed
  54. Mullard 3-3 PCB
  55. OTL Using OPT
  56. VA/CF 6SN7 preamp input points?
  57. Copper losses in output transformers
  58. Yaqin MC550 Anyone?
  59. Bigger value output coupling
  60. DIY KT88 SEUL
  61. Leben CS300x feedback loop cap
  62. 6T8 / EABC80 as phase splitter / other uses
  63. Curve Tracer Screen Current
  64. Aikido Cathode Follower preamplifier with remote
  65. Grid Isolation in Fault Conditions
  66. Audio research ls2b parts list
  67. Heathkit USC-1 pre-amp
  68. Counterpoint SA3 Project
  69. Why such a high bias current on output valves ?
  70. how long before new tubes are run in ?
  71. Latest project, valve stereo disco mixer
  72. Mullard 5-20 EL34 biasing
  73. Parallel Driver Tubes?
  74. B+ Regulators
  75. Looking for Cary SLP98 Tube Preamplifier Schematic
  76. Hirage Le Monstre euals my best valve amps !
  77. Ran a JJ6v6S at 37 Watts, is it damaged?
  78. Zener diodes as protection clippers
  79. KT120 upgrade from KT88 6550
  80. panasonic dc link capacitors
  81. PTFE covered wire
  82. Grounding Qustion?
  83. New high-Z 1:1 input transformer from Hammond (10k:10k)
  84. Tube amp wiring and temperatures
  85. Pete Millett's Uniamp
  86. 211 tube. more time to brake in or bad tube
  87. Just a thought.
  88. Tube Heater Question
  89. No not Again...Aikido Plate dissipation question
  90. RH amp question!
  91. Mullard 5-20 power supply
  92. b&k 500 tube chart question
  93. Combining two single-ended tube stages for XLR-output - Question
  94. Scope pattern
  95. Diode cathode bias?
  96. Contact Enhancers/Corrosion Inhibitors for Aluminum
  97. My SE 46 tube monoblocks project
  98. E88CC / 6922 Datasheet Limiting Values
  99. Fisher Power Transformers
  100. does someone know about this russia amplifier ?
  101. How to improve this 6B4G push-pull circuit
  102. EL34 UL PP Transformer
  103. sears silvertone medalist stereo amp schematic needed
  104. Led bias on powertubes?
  105. Thermal Runaway
  106. Going from zero to pro tube amplifier. Resources?
  107. DIY Novar Socket
  108. Hum pickup from line output transformers
  109. Photo of a JJ 300B Filaments!! Please! :)
  110. Super FU-29
  111. Questions about Tim Mellow 6C33C OTL
  112. James or Silk for EL36SE?
  113. Dead KT88
  114. MS 110B KT88 INTEGRATED AMPLIFIER
  115. The Mighty 6550...
  116. recomend me some EL34 PLEASE
  117. Adding tone controls
  118. TJ Full Music 2A3/CNE
  119. groove tubes for headphone amp
  120. IXYS LTSpice Models (or something equivalent?)
  121. Soviet 6p3s/6p3s-e
  122. A case of direct coupled cathode follower
  123. SE45 schematic monoblock to stereo help
  124. Heathkit Schematics & Manuals
  125. 211 tube amp problem Help
  126. Department of inapprehensible schematics
  127. How low can you go...?
  128. EL34/6L6 Screen reistors...
  129. 809, anyone played around with them?
  130. Skinny OTL
  131. Adjust drive and output level with one knob
  132. Help me rack some Gates Program Amps
  133. Switch Mode Heater Supply
  134. Pre Ampje
  135. Maida Regulator Digital Control
  136. Worried by 110v reading on 6.3v tap....
  137. Safety Alert - UK Yaqin users
  138. 27> EL34 (triode) > 300B
  139. Rockola juke box amp - unusual features
  140. 3.5 watt ECL82 Amp
  141. 12BH7 Headphone Amp
  142. White Cathode Follower Quandary
  143. help in aikido for sennheiser hd580
  144. Home brew more economical than an ST-35
  145. Modeling Pull-Push transformer in LTspice
  146. The Fisher 400-C "Fixer-upper"
  147. Power Transformer question/concern
  148. Nice little schematic drawing app w/ tube symbols
  149. best budget diy kit?
  150. Transconductance amplifier for headphones.
  151. El Cheapo information?
  152. Aikido 9-Pin Configuration
  153. Strange motorboating issue
  154. Lumley M120 Monoblocks - Need Manual, schematic or anything !!!
  155. Substituting higher wattage resistors
  156. cap coupling to interstage transformer or direct coupling?
  157. A question of feedback..
  158. Two Monoblocks "Dying" Within Days Of Each Other
  159. Russian 1Zh24B Pentods / design assistance.
  160. What Tubes for 5.8k PP transformers
  161. Problem with a power transformer.
  162. 300B OTL Preamp/Headphone Amp
  163. tantalum resistors
  164. 6BM8 in STC mode
  165. My Moscode again: What is the bias current?
  166. OTL WCF headphone amp build + awesome prototype material
  167. Type 42 single ended ideas
  168. Help with my Moscode 300 amp
  169. Thoughts on this volume potentiometer?
  170. Optimum load impedance for PCL85?
  171. Croatian triode Festival 2014.
  172. Old ekco tv transformers
  173. vacuum tube score.. what to do with
  174. Valve based disco mixer.
  175. Webcor ceramic phono input circuitry suggestions?
  176. Position of OPT windings
  177. sd2 seven pin??
  178. Help design a Small 250VDC PSU for tube preamp
  179. Bright Driver Tubes 12AU7, 12BH7, 5814...
  180. Question about using tube socket center hole for star ground
  181. Heathkit UA-2 clone project
  182. Schematic CAD Program
  183. Latest on the RH amps..
  184. Transformer design program
  185. 807 "Musicians Amplifier" help
  186. J.E. LABS PP2A3 POWER SUPPLY ?
  187. Mono Block Building Project
  188. EL34 CCS ideas
  189. Magnavox 8601-20
  190. wood/metal vs all-metal chassis
  191. Design data on dry battery tubes
  192. Differential tube with a gain stage 1178
  193. 6C4C tube ...Good to buy ?
  194. Including a C- winding on a filament transformer
  195. CINEMAG 15B TRANSFORMERS balanced>unbalanced
  196. Rebuilt Heathkit AA32 with hum on MAG PHONO input
  197. Electrolytic cap question
  198. Tube Socket ID
  199. JJ 5Y3S is too tall...need smaller tube
  200. Uniamp 2A3
  201. buzz noise from paraphase circuit
  202. Benefits of Enhanced Triode Connection
  203. Working out a valves load resistance?
  204. 813 Alternatives
  205. Help 6N6T pinout
  206. Very large parafeed cap
  207. Bright purple flash 6N1P
  208. Harman Kardon Citation II - rebuild questions
  209. Stoetkit junior mk2
  210. 1619 Push pull output stage
  211. Tube getter
  212. The sensation of the 21st Century. Galvanic SUPER HIGH END PP power for all types of
  213. Audible Illusions and 6922
  214. quick access tube amp protection
  215. Identifying Genalex KT66 matched pair question
  216. Hunting 100Hz noise in SRPP+ stage
  217. JJ ECC83S Biasing conditions
  218. Audiophiletalk - Dirt Cheap SE
  219. 12AL8 Head-Amp with UTC Output Transformer
  220. SET monoblocks?
  221. EL84 Push Pull design from left over parts
  222. Strange UL Transformers
  223. Stabilization balanced currents in the PP stage.
  224. Current mirror stage in PP
  225. EL34 SE ultralinear schematic
  226. Question: Acceptable DC current in push-pull output transformer due to tube mismatch?
  227. Toroid Power Transformer For GM-70 845 211 1000V
  228. Building the "Crystal Palace" Amp
  229. Improved Sound Card Interface - Ideas and Suggestions?
  230. Upgrading OPTs in production amp? (Yaquin MC-10L)
  231. any good Triode 6H8C preamp schematics out there???
  232. pushpull 6aq5 distortion
  233. Mr. Lian 845 SET more kit rather than commercial product.
  234. Opinion for otl ocl headphone amp
  235. Tube-newby wanting to make a good tube amp
  236. Anyone used a voltage tripler PS?
  237. Audioromy 828A / FU-29 tube layout
  238. Choosing Cathode Bypass Capacitor
  239. Ground loop gremlins
  240. Crackling Amp after Accident
  241. New CCS/ depletion mode MOSFETs available... experience anyone?
  242. Mengyue Mini
  243. Parafeed quest
  244. Determining linearity - differential gain stage
  245. 6HB6 - Any pratical experience?
  246. 27 Tube Preamp design questions
  247. Output Transformers Mount Position
  248. Critique please: Fixed bias 7591 SE
  249. Coupling Cap Improvements?
  250. RL 12T 15

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