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  1. 1634 dual triode
  2. Aikido line amp
  3. Winding an ISO TX with pair of inductors
  4. Quad II Switch Mode PSU
  5. What do do with all of these?
  6. global negative feedback in el84 push pull
  7. Old HP transformer - what is it?
  8. FET Phase inverter to drive valve PA
  9. Core Audio 6BC4 buffer problem
  10. JCM Build - Voltage problem!
  11. Power Amplifiers & Gain
  12. Power tube maximum current draw from a power supply
  13. Tube Matching in a Power Amp?
  14. SE stereo / PP mono block schematic choices
  15. How to measure output transformer?
  16. Peavey VTM 60 vs Orange Tiny Terror
  17. Shoddy Packaging
  18. Schematic needed for Manley SnapperŪ from Manley Labs
  19. Resistor, capacitor across output transformer AKAI M-7
  20. eBay&etc cheap tube buffers/preamp .. anything good?
  21. 6N3 Preamp Question
  22. OK guys...be gentle
  23. 6SN7 and DN2540's
  24. 10k and 6k primary windings on OPT. Use for UL?
  25. Settings for PL509, EZ80 tubes on 539c tester
  26. replacing 6LGC with 6550 or KT88
  27. ECC83 input circuitry
  28. Dynaco MK III modifications
  29. SMPS for heaters
  30. Headphone tube-amp with oddball OPT
  31. Neon Lamp Question
  32. Curious old tubes from tandy
  33. 828 Triode Curves?
  34. 813 review
  35. tube circlotron for headphone amplifier
  36. valve headphone pre-amp
  37. Shengyi 6AQ5
  38. Burn in small signal tubes?
  39. 24V powered 6N11 amplifier, 0.25% distortion, pretty good!
  40. SS diode replacements
  41. Bass guitar amp using 832a/GU32 tubes
  42. can you check if everything is ok with el84 schematic please
  43. Advice on this amp schematic please
  44. 8156's
  45. Can't get anything from my new pre-amp
  46. Bottlehead Paramount Question
  47. need help with ac/dc am/fm radio
  48. Peculiar oscillation
  49. ECC83 settings for Taylor 45C
  50. New Jolida 302b amp owner questions
  51. Help with gyrator
  52. Some basic questions...
  53. I have a hard one for you guys
  54. CCS pulsing oscillation problem
  55. tube testers: different gM standards for same tube?
  56. Frank's Pre Still In Vogue?
  57. Home made tube amps
  58. Source for SED "winged C" tubes?
  59. Preamp Help
  60. Push Pull Class A
  61. Multi-Ways Output Transformers
  62. Redplating anomaly?
  63. Marshall JCM900 2500 preamp
  64. Just for fun power poll!
  65. BIASING A JADIS ORCHESTRA
  66. Yaqin MC-50L
  67. CJ PV5 Upgrades?
  68. New Member - Magnavox Amps
  69. Double parafeed
  70. 6550 grid characteristic help please
  71. Newbie- Tube Testing RF Amp tube
  72. Urgent:Wrongly order 220V Power supply for 230V enviroment
  73. Mono sub-out from one trafo?
  74. Mu Follower to drive a Push-Pull Amplifier?
  75. The 6934A Triode Tube
  76. Constant current sink for 6SN7
  77. 6V6 high voltage
  78. VTL deluxe 100 monoblk (KT88) need help?
  79. Va,Ia exeed limiting values in datasheeds ?
  80. Old DIYtube ST-35 electrolytics - swap?
  81. What Hammond for UK?
  82. What would you build with this transformer set?
  83. EL86 / 6CW5 + 6BQ7A amp design
  84. Western Electric theater amplifiers; how to hook them up?
  85. 12AU7,12B4A PSE schematic needs finishing!
  86. Dual grid and plate pins
  87. Best sounding ECC83 ?
  88. tube output for Playstation 1
  89. 6GX8 as Audio Level Indicator?
  90. Wurlitzer 6150 Organ Tube Amp convert Guitar Amp
  91. help on 12AU7 Preamp circuit
  92. Anyone bought tubes from http://www.nostubestore.com/ ?
  93. Tube pre-amp with exposed tubes?
  94. Using low voltage lamp in power supply
  95. GU 50 monoblock
  96. KT-88 Push Pull with CFB
  97. 12AX7 + ?? Ideas 2A3 // 6L6
  98. Formula for driver current requirement ?
  99. Need a little help with a regulator circuit if you are willing.
  100. Troubleshooting help for 12AQ5 amp
  101. Can anyone help with an ef86 tape preamp mod please?
  102. Herald Amp
  103. To switch B+ or not?
  104. All-tube vs tube/mosfet hybrid ?
  105. 6c33c-b question
  106. 12AT7 substitutes?
  107. 1st project salvaged sears receiver iron need good amp schematic
  108. FM-3 ? About parts replacement in IF stages
  109. simple EL84 parallel?
  110. Finished: Claus Byrtih EL34 amplifier on Isophon BS35 speaker set
  111. Yet another resistor thread
  112. Bogen CHB100 Valve Question
  113. 1st build; Adding load to PT secondary
  114. need help RCA RS 199C
  115. Unusually high Gm
  116. RH84 motorboating, stereo vs mono
  117. Use a tube rectifier for grid bias voltage, AA5 Radio tubes and usage.
  118. Cathode bypass with Long tail pair
  119. new chinese tube manufacturer
  120. Black Gate WKZ - can they be used in these circuits?
  121. Yet another question about HV Maida Regs
  122. Question about vacuum tubes
  123. Scott 299D Calibration
  124. Score! Bag-O-tubes!
  125. Building a tube integrated amp
  126. Audio Note Kits L1 Build...
  127. Need help with old mic amp
  128. Temporary hum
  129. Unidentified Tube - One for the detectives!
  130. Rogues?
  131. What about big tube RV278 Telefunken?
  132. variac variable transformer
  133. Tube amp OPT for Headphone Amp? (impedance matching question)
  134. current needed for 4x50l6 & 3x6sn6
  135. 6N11 tube work at 24V power supply?
  136. Heater voltage 5volt!
  137. help me choose a high end opt for tubelabs SE!
  138. 6L6/807 AB2 triode-- screen drive?
  139. help troubleshooting
  140. Anode Follower Article
  141. ECC802S 12AU7 ECC82 heater question
  142. Books for amplifiers
  143. E180F Preamp
  144. Don Allen Amp's ????
  145. To connect or not to connect..........
  146. Phonostage with tube moving coil
  147. 300b tube Temperature?
  148. Center tap transformer for elevated heater supplies
  149. single ended kt88 fuse blowing after an hour
  150. Help getting more gain from a Peavey Butcher
  151. Radiotron question
  152. suggested use for old telefunken tubes
  153. Using different ouputs for two different drivers
  154. Pete Millett Uniamp with 300b
  155. Cary slp-70
  156. How to combine 2 signals from 2 gain stages
  157. Increase B+ supply
  158. Aikido Tetra Sans Phono PCB
  159. Loadlines and distortion (6S33S/6S41S)
  160. home theatre bypass feature
  161. Doubling the power of hifi tube amplifiers
  162. Can this tube be used in audio amplifier?
  163. 100 V OPT
  164. Help me understand tube chart data
  165. Listening preference....
  166. tube socket legs?
  167. Stand alone gain stage pre-amp
  168. I kinda sorta burned up my K12-G power transformer
  169. RCA-182 Tube Amp
  170. Transformer potting material? what material?
  171. Ultimate 6xEL34 PPP monoblocks? Hopefully with your help :)
  172. tube amp/pre in car?
  173. Thorsten's tube Stage for TDA1541A
  174. Please help me identify these .45 3kv TRW caps
  175. Convert Gates pre-amp to DC filament?
  176. any suggestions for a mid-amp transformer for a hybrid design... like this circuit...
  177. how much C is too much C?
  178. fisher 70AZ
  179. RE: My first attempt at using Tube Cadd
  180. Srpp simple explanation
  181. Driver for a 807 em triode mode...help !!!
  182. 6J6-based SSMH?
  183. Small tube amp based on 6N6P
  184. replacement for Ei 12BH7AEG
  185. Preamp input tube noise
  186. How much is too much for a 6L6GB?
  187. What is the proper way to measure transformer inductance?
  188. Audio Research LS8 mod. to MKII
  189. Futterman stage max input
  190. How important is ESR in PS Caps?
  191. Pushing 6p14p too hard
  192. Who can tell me in Rome where can i buy antique Vacuum tube?
  193. Is the YAQIN MS-12B (220v +-10%) safe to use in UK
  194. Priboi biasing
  195. Whither Westrex ?.
  196. Tube Phono Pre-Amplifiers
  197. Pioneer SA400 -- Headphones hum, speakers don't. Why?
  198. DIY tube amps for surround sounds?
  199. Bad solder joints in Fender Deluxe VM
  200. Rotary switch for attenuator
  201. What is Matise circuit?
  202. 6bq5 red plating
  203. Technical questions about Melos MA-333
  204. What's this in old Fender amps?
  205. idiot proof mono push pull 6l6gc schematic wanted
  206. Passive Preamp Mod help
  207. KT77 OPT impedance
  208. i think i'm thru with 2A3 tubes
  209. VTC4U? Is that the name of the tube tower/shroud seller?
  210. 8417 triode el.. Mod??'s
  211. Gramp's Zenith MLT 15
  212. Class A tube amplifier Kit
  213. IERC tube coolers for EL34 on the Bay
  214. Stromberg Carlson ASR 433
  215. quads11&22 back into service
  216. New Tubes for sale
  217. Best design for Lundahl LL1679/PP
  218. 12U7 LTP vs. 6922 cascode
  219. Need help calculating value of balancing resistors
  220. 12ax7 12au7 preamp
  221. Western Electric 471A...any information ?
  222. Please Reply
  223. tube line preamplifier circuit
  224. 6L6 Ultralinear cathode Follower
  225. Grid current operation
  226. 431 based screen supply
  227. Where did all the money go?
  228. Hyperx soft start any good for valve amp situation?
  229. Class AB2, Class B, and Hifi
  230. PP 6b4g bad / distorted channel diagnostics
  231. Transformer usage ??
  232. Phono Amplifier
  233. Need EL84 Brand Identification
  234. RCA Octagon dating
  235. Most Accurate Bias Testing Method
  236. ASL AQ1003DT schematic or manual?
  237. Penta brand 6L6GC info?
  238. Mod to SE 6SN7 - 6V6 amp
  239. adjust filament ECC82/83
  240. Clear out of old valves - advice needed
  241. Help ID this OPT
  242. Help? 6n23p cathode follower
  243. DC Heater Caps
  244. Load Line and Biasing for Class AB 6550 power amp
  245. Amp project help needed
  246. LTP with CCS and feedback
  247. Clarion simple 2A3 amplifier
  248. Another question about plate curves and pentode load lines
  249. 5V Indrect Heated Rectifiers?
  250. Easy CCS

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