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  1. Using UL taps instead of the anode taps to alter inpedence
  2. Help fast please! Type 3 Ei KT90's - Pre or Post War? How do you know?
  3. 807 PSE schematic design need
  4. 3 direct coupled 2A3 amps
  5. Tube preamplifier with chip power amp
  6. Anyone used IXCP10M90S ltspice model ?
  7. and the quiz identify power trans continue
  8. Valve HT power supply common-mode noise
  9. 12AX7 and 6AS5 tube amplifier
  10. Working with Eagle and single channel tube amp board.
  11. New hands-on tutorial for Tube Newbies
  12. Help me to choose tube "1 no ring" "2 has ring"
  13. Chinese board 6L6 KT88 is it worth???
  14. Valve Rectifier Testing
  15. Harman Kardon TA-120 Output Transformer
  16. Single ended transformer as pushpull?
  17. Resurrecting a nOrh SE9 Integrated Amp
  18. Fisher Amps?
  19. Repurposing an old Gulbransen Organ tube amp
  20. Help, the sound is silken or blow up?
  21. Now here's an idea - The DIYF QUAD
  22. Parallel output SE amp options
  23. What tube is equivalent 5879?
  24. Filament Xfmr: can I trade volts for amps?
  25. GU50 PP possible with this iron ?
  26. Hifi tube amps - overall sound
  27. Preamp grounding questions
  28. Tube rectifiers
  29. DIY PL84 + E180F
  30. McIntosh on How It's Made
  31. Choke input LCLC supply - question on minimum current
  32. EBC3 & CBL1 Tube AMP
  33. CLASS A HYBRID POWER AMP
  34. MXL V69 Mogami Edition signal cuts in/out
  35. Ultra-linear plate characteristic curve for EL34
  36. Need help to modify circuit to suit replacement power XFMR
  37. Line preamp schematic for 5GH8A wanted.
  38. help please - modify phono corrector
  39. Help me: Brimar 5Z4G, 5Y3GT is this an equivalent to a 5Y3WGTA?
  40. A Russian glow tube regulator with specs of 75V 60mA ?
  41. Help with filament for ecc88
  42. How much power transformer is necessary?
  43. testing the 300b tube
  44. Headphone amplifier outputs, so many permutations!
  45. tube footprint in Eagle
  46. Need VTVM repairs
  47. First Timer - DIY Tube Amp
  48. Help identify OT please
  49. gEDA and tubes
  50. Triode Electronics Issues?
  51. RCA BC5B consolette manual?
  52. Help with converting EL37 amp to KT66
  53. treadmill choke
  54. Preamp OPT
  55. Probleme with Volume Pot
  56. Simple SE 6L6 2 watt Homebrew
  57. is 6J32P equivalent of EF806 ?
  58. new tubes vs old ones
  59. 6p36s tube torture.
  60. Questions re: Bypass of B+ to differential amp
  61. Tube choice for yaqin cd3 buffer
  62. yesterday and today
  63. 260VDC need how much VAC transformer, is it 184VAC?
  64. preamp static
  65. Tube Line or Phono Stage bare kit
  66. Grounding of Hammond transformers
  67. Spud Amplifier with 6E5P Tube
  68. RAT Tube Tester build
  69. need a little help with identification
  70. aikido 12vac help needed
  71. Mullard 3-3 PCB
  72. OTL Using OPT
  73. VA/CF 6SN7 preamp input points?
  74. Copper losses in output transformers
  75. Yaqin MC550 Anyone?
  76. Bigger value output coupling
  77. DIY KT88 SEUL
  78. Leben CS300x feedback loop cap
  79. 6T8 / EABC80 as phase splitter / other uses
  80. Curve Tracer Screen Current
  81. Aikido Cathode Follower preamplifier with remote
  82. Grid Isolation in Fault Conditions
  83. Audio research ls2b parts list
  84. Heathkit USC-1 pre-amp
  85. Counterpoint SA3 Project
  86. Why such a high bias current on output valves ?
  87. how long before new tubes are run in ?
  88. Latest project, valve stereo disco mixer
  89. Mullard 5-20 EL34 biasing
  90. Parallel Driver Tubes?
  91. B+ Regulators
  92. Looking for Cary SLP98 Tube Preamplifier Schematic
  93. Hirage Le Monstre euals my best valve amps !
  94. Ran a JJ6v6S at 37 Watts, is it damaged?
  95. Zener diodes as protection clippers
  96. KT120 upgrade from KT88 6550
  97. panasonic dc link capacitors
  98. PTFE covered wire
  99. Grounding Qustion?
  100. New high-Z 1:1 input transformer from Hammond (10k:10k)
  101. Tube amp wiring and temperatures
  102. Pete Millett's Uniamp
  103. 211 tube. more time to brake in or bad tube
  104. Just a thought.
  105. Tube Heater Question
  106. No not Again...Aikido Plate dissipation question
  107. RH amp question!
  108. Mullard 5-20 power supply
  109. b&k 500 tube chart question
  110. Combining two single-ended tube stages for XLR-output - Question
  111. Scope pattern
  112. Diode cathode bias?
  113. Contact Enhancers/Corrosion Inhibitors for Aluminum
  114. My SE 46 tube monoblocks project
  115. E88CC / 6922 Datasheet Limiting Values
  116. Fisher Power Transformers
  117. does someone know about this russia amplifier ?
  118. How to improve this 6B4G push-pull circuit
  119. EL34 UL PP Transformer
  120. sears silvertone medalist stereo amp schematic needed
  121. Led bias on powertubes?
  122. Thermal Runaway
  123. Going from zero to pro tube amplifier. Resources?
  124. DIY Novar Socket
  125. Hum pickup from line output transformers
  126. Photo of a JJ 300B Filaments!! Please! :)
  127. Super FU-29
  128. Questions about Tim Mellow 6C33C OTL
  129. James or Silk for EL36SE?
  130. Dead KT88
  131. MS 110B KT88 INTEGRATED AMPLIFIER
  132. The Mighty 6550...
  133. recomend me some EL34 PLEASE
  134. Adding tone controls
  135. TJ Full Music 2A3/CNE
  136. groove tubes for headphone amp
  137. IXYS LTSpice Models (or something equivalent?)
  138. Soviet 6p3s/6p3s-e
  139. A case of direct coupled cathode follower
  140. SE45 schematic monoblock to stereo help
  141. Heathkit Schematics & Manuals
  142. 211 tube amp problem Help
  143. Department of inapprehensible schematics
  144. How low can you go...?
  145. EL34/6L6 Screen reistors...
  146. 809, anyone played around with them?
  147. Skinny OTL
  148. Adjust drive and output level with one knob
  149. Help me rack some Gates Program Amps
  150. Switch Mode Heater Supply
  151. Pre Ampje
  152. Maida Regulator Digital Control
  153. Worried by 110v reading on 6.3v tap....
  154. Safety Alert - UK Yaqin users
  155. 27> EL34 (triode) > 300B
  156. Rockola juke box amp - unusual features
  157. 3.5 watt ECL82 Amp
  158. 12BH7 Headphone Amp
  159. White Cathode Follower Quandary
  160. help in aikido for sennheiser hd580
  161. Home brew more economical than an ST-35
  162. Modeling Pull-Push transformer in LTspice
  163. The Fisher 400-C "Fixer-upper"
  164. Power Transformer question/concern
  165. Nice little schematic drawing app w/ tube symbols
  166. best budget diy kit?
  167. Transconductance amplifier for headphones.
  168. El Cheapo information?
  169. Aikido 9-Pin Configuration
  170. Strange motorboating issue
  171. Lumley M120 Monoblocks - Need Manual, schematic or anything !!!
  172. Substituting higher wattage resistors
  173. cap coupling to interstage transformer or direct coupling?
  174. A question of feedback..
  175. Two Monoblocks "Dying" Within Days Of Each Other
  176. Russian 1Zh24B Pentods / design assistance.
  177. What Tubes for 5.8k PP transformers
  178. Problem with a power transformer.
  179. 300B OTL Preamp/Headphone Amp
  180. tantalum resistors
  181. 6BM8 in STC mode
  182. My Moscode again: What is the bias current?
  183. OTL WCF headphone amp build + awesome prototype material
  184. Type 42 single ended ideas
  185. Help with my Moscode 300 amp
  186. Thoughts on this volume potentiometer?
  187. Optimum load impedance for PCL85?
  188. Croatian triode Festival 2014.
  189. Old ekco tv transformers
  190. vacuum tube score.. what to do with
  191. Valve based disco mixer.
  192. Webcor ceramic phono input circuitry suggestions?
  193. Position of OPT windings
  194. sd2 seven pin??
  195. Help design a Small 250VDC PSU for tube preamp
  196. Bright Driver Tubes 12AU7, 12BH7, 5814...
  197. Question about using tube socket center hole for star ground
  198. Heathkit UA-2 clone project
  199. Schematic CAD Program
  200. Latest on the RH amps..
  201. Transformer design program
  202. 807 "Musicians Amplifier" help
  203. J.E. LABS PP2A3 POWER SUPPLY ?
  204. Mono Block Building Project
  205. EL34 CCS ideas
  206. Magnavox 8601-20
  207. wood/metal vs all-metal chassis
  208. Design data on dry battery tubes
  209. Differential tube with a gain stage 1178
  210. 6C4C tube ...Good to buy ?
  211. Including a C- winding on a filament transformer
  212. CINEMAG 15B TRANSFORMERS balanced>unbalanced
  213. Rebuilt Heathkit AA32 with hum on MAG PHONO input
  214. Electrolytic cap question
  215. Tube Socket ID
  216. JJ 5Y3S is too tall...need smaller tube
  217. Uniamp 2A3
  218. buzz noise from paraphase circuit
  219. Benefits of Enhanced Triode Connection
  220. Working out a valves load resistance?
  221. 813 Alternatives
  222. Help 6N6T pinout
  223. Very large parafeed cap
  224. Bright purple flash 6N1P
  225. Harman Kardon Citation II - rebuild questions
  226. Stoetkit junior mk2
  227. 1619 Push pull output stage
  228. Tube getter
  229. The sensation of the 21st Century. Galvanic SUPER HIGH END PP power for all types of
  230. Audible Illusions and 6922
  231. quick access tube amp protection
  232. Identifying Genalex KT66 matched pair question
  233. Hunting 100Hz noise in SRPP+ stage
  234. JJ ECC83S Biasing conditions
  235. Audiophiletalk - Dirt Cheap SE
  236. 12AL8 Head-Amp with UTC Output Transformer
  237. SET monoblocks?
  238. EL84 Push Pull design from left over parts
  239. Strange UL Transformers
  240. Stabilization balanced currents in the PP stage.
  241. Current mirror stage in PP
  242. EL34 SE ultralinear schematic
  243. Question: Acceptable DC current in push-pull output transformer due to tube mismatch?
  244. Toroid Power Transformer For GM-70 845 211 1000V
  245. Building the "Crystal Palace" Amp
  246. Improved Sound Card Interface - Ideas and Suggestions?
  247. Upgrading OPTs in production amp? (Yaquin MC-10L)
  248. any good Triode 6H8C preamp schematics out there???
  249. pushpull 6aq5 distortion
  250. Mr. Lian 845 SET more kit rather than commercial product.

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