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  1. Fixed Bias question
  2. vintage ua 610 schematic
  3. Which KT88 PP and which Transformers?
  4. Some more special small-signal tv tubes
  5. MR 67 Coupling Caps
  6. Help - YAQIN MS-20L schematic
  7. Power and Speaker cables
  8. v1 tube keeps going microphonic help! 5e3 build
  9. GU50 Prototypes
  10. Leak TL12+ with triode mode EF86
  11. diy tube dampers
  12. My Tube pre-amp
  13. VTVM troubleshooting help
  14. PP amp crossover distortion
  15. Sanity check please? ST-70(-ish) power supply
  16. Thoughts of apparent noise on ground - due to power tx?
  17. hybride circlotron
  18. Clone
  19. 8156 Beam Pentode Compactron
  20. DOUBLE TRIODE (6N16B)
  21. looking for Tube I/V analog for dac schematic ?
  22. NewBee PPEL84
  23. Whooaa! Now we're talking.
  24. Cinema Engineering AT-18
  25. Back from school
  26. Amp ideas for my spare 3.3k output transformers.
  27. HEllo and a few suggestions please
  28. 1SH24B Pre-Amp (or buffer?)
  29. Anode cap for GU 29 / QQE06/40
  30. Back to back autotransformers for B+?
  31. Sound Valves M60 schematics
  32. Volume Pot for RH84
  33. Mengyue mini el34b
  34. Which Chinese integrated tube amp have the power for Rock Song ?
  35. Help on transformers please
  36. 300B alternatives
  37. Anybody using a tube amp in their car?
  38. What is a KT88-98?
  39. 6au6 line stage a bad idea?
  40. Making a Kron tube
  41. AY Symphonies preamp
  42. Need to Upgrade Tube Preamp Volume Pot
  43. Tubelab Simple SE low B+
  44. Filament AC or DC?
  45. rasping sound from Dared VP-16
  46. Anyone have any "small signal" pentode models?
  47. Power amp distortion for modern amps
  48. Help with EL504-based amplifier
  49. Tubes: Are they worth it?
  50. Radio Shack Boston Monobloc (fuse question)
  51. 829B 3E29 Pentode PPP?
  52. Fixed Autobias?
  53. Best wishes
  54. Radiotron A504 amplifier schematic
  55. Blown power tube - a short story
  56. Hickok 752A calibration?
  57. replace EL34 with EL37 !?
  58. Mono push-pull driver PCB
  59. Magnavox 139AA schematics, info?
  60. Anyone knows what driver tube on DowdyLama's GM-70......
  61. Building an amp around the QB5/1750 transmitter tube
  62. Instrument amp from '59 Lowrey donor chassis.
  63. cascoded gyrator loaded 6H9C to low idle.
  64. vacuum tube DAC and connection
  65. Dynaco ST70 II Right Channel Out
  66. ST70 Inrush Issue
  67. ECC88 OTL heaphone amp
  68. Help with deciding to build or buy Tube amp.
  69. Luxman LV-105 static on on channel
  70. equivlent of FU-50
  71. placing the volume control
  72. PP 300B ''transformer coupled''
  73. My First Tube Preamp
  74. Tube amp kit and speaker recommendations?
  75. First design GU81M SE triode
  76. Instruments & Amps forum - where is it?
  77. Power supply capacitor question for tubelab simple ss
  78. EL300 = 6FN5 / PL300 = 35FN5 tube
  79. 6U8 driving 45
  80. very low impedance white follower with 6H13C
  81. EL86 Any idea helps.
  82. 6112 and 6111 Mini-preamp
  83. Expert advice on what preamp to chose
  84. Harman Kardon DPR-7, Commander series pre/mixer
  85. input transformer - mumetal casing etc.
  86. Oil-filled caps: ASC versus Panasonic
  87. SOHA headphone amp
  88. Using a single triode as a .......
  89. Sonic Frontiers SFP-1 Phono Stage
  90. Help!! with attenuation.
  91. power up inrush current limiter - anyone using?
  92. Audioromy FU-29, Latest Model 828A Mini Review
  93. Vertical-deflection
  94. Drilling a hole
  95. Edcor CXPP25-MS-8K V Triode Z-565
  96. bad opt measured values
  97. Mu Follower EL34
  98. Hickok 539 question...
  99. need datasheets for a phillips transformer if anyone has any
  100. Chicago power XFMR question.
  101. Coupling Capacitor - Pls Help
  102. Help please on Christmas gift
  103. Audio Note P-zero
  104. SE EL34 Schematic - What do you think?
  105. Playing with hybrid amp: SRPP + MOSFET
  106. 300B filament supply question
  107. KT88 Parallel Push Pull
  108. cheating life out of old tubes?
  109. dBu transformer ratings
  110. Dared MP-2a3c mods
  111. Output transformers (Wolpert)
  112. Using Mains Transformers as Outputs
  113. Tube just for show...
  114. first project - first post - poddwatt
  115. High power CCS
  116. Analog Summing
  117. My new el34 + 12ax7 VCT amp. (Need Ideas For my first headphone vacuum tube amp Too~)
  118. cascode tubes
  119. High Fidelity by Pilot (circa 1953)
  120. Hardware help please
  121. integrated amps 100 per channel
  122. KT88 mounting question
  123. Output Transformer question
  124. Angstrom Thermionic
  125. ECC88 tube buffer NEEDED !
  126. The best preamplifier
  127. Marshall 8080, missing components
  128. Paralell SE 807 Amp design
  129. Putting together a tweaker friendly amplifier!
  130. Tube chassis
  131. DHT headphone Hybrid-CF+
  132. Looking for specs on this Beyer Xfmr
  133. Resistors for Berning EA-2101?
  134. Uneven Plate Glow
  135. Parafeed transformer sounds thin
  136. Lightbulbs as ccs
  137. My AWESOME First DIY amp
  138. Cary audio design SLI 80
  139. A1538 OPT?
  140. Genalex A2900 Keep or Sell?
  141. 6CB6 Spice Model wanted
  142. XFMR Help?
  143. 12 volt to 300 volt inverter question for tubes
  144. These amps should be verboten!
  145. how to use PCL86 instead of ecl86
  146. PSU for Aikido (4x 12SN7)
  147. SCA35 and AU-70
  148. Analisys of power amp limitations of tube bias range
  149. DIY Phono Preamp ??
  150. NOS 211 RCA or National Union?
  151. Iron Powder + Resin Output Transformer
  152. The Radio Hat Challenge
  153. EU regulations
  154. Transconductance for kt-90 in plain english
  155. Craftsmen RC-2
  156. Valve Amplification Company V100
  157. Parallel feed transformer with SRPP
  158. It's heeeeeere!- Valve Amplifiers 4th Edition
  159. opera consonance phonostage-PM1
  160. Anybody Explain this Preamp shematic?
  161. The high-voltage collection
  162. Input transformer topology question
  163. JE Labs 300Bdx stereo - troubleshooting
  164. battery operated 12/24/48 Volt multiple tube OTL
  165. Bringing up long-stored tube gear
  166. About RH84 three channel?
  167. MCC with Fisher
  168. Directly heated cathodes
  169. Build recommendation
  170. Ortofon KS 591 - informations
  171. Oatley K295-extra space for tubes
  172. A beginner's tube amp to drive a pair of fostex Fe103e
  173. Tame the beast.
  174. KT88 and Hammond Transformer
  175. B+ Drifts down after 2 hours
  176. Power amp sputters on turnoff
  177. Yet another EQP-1A
  178. How to bias 6SL7?
  179. 6CG7/6FQ7 = 6N5P (6Н5П)
  180. #27 mu stage
  181. Compactron Regulated Power Supply
  182. Best sounding voltage amplifier for hybride.
  183. PX25 to 300B pins
  184. de-gassing power tubes???
  185. Heathkit 51-29 output transformers issure
  186. 6AS7 Model
  187. 26H choke good enough for a grid or anode choke?
  188. Russian 6R2P for small amp.
  189. Power transformer primary is open.
  190. Rectifier oddness
  191. First Tube Build, Thoughts?
  192. Output Transformers
  193. Lazy Sunday 6SN7 Preamp
  194. Audio research VT200 Biasing & Schematic
  195. finished my new preamplifier!!
  196. What would be the correct output cap for this OTL Headphone Amp?
  197. Full Bridge Rectifier With Tubes
  198. Looking for data sheet for GE JAN 6146W/7212
  199. Best Valve pre-amp match for ME 550 amp
  200. Fisher 500c
  201. From old Philips tube books , just for tube audio DIY friends !
  202. UFO
  203. Adding a preamp?
  204. XS-225 valve amp circuit.
  205. LS7/CV1660 curves
  206. Differences between 12V6 tube and 12A6 tube?
  207. Please check my schematic
  208. 12W Push pull w/6C4C
  209. Tube Date Code
  210. For new members....
  211. Graphite ring on sweep tubes
  212. 6N6P tube - focus on
  213. Vox Guitar Amp Created a Revolution
  214. Hot tube preamp pedal build
  215. Counterpoint Electronics/Counterpoint Acoustics/Counterpoint Audio
  216. Radford STA100 improvements?
  217. Playmaster unit 2 help needed!
  218. help me build an output transformer
  219. Vintage Magnavox tube amp
  220. Christmas Build, advice needed.
  221. Speaker suggestions for ST-70
  222. Tube markings?
  223. gaumont-kalee
  224. amplifiers audio research D90
  225. 40W Glass A 300B tube schematic needed.
  226. Hum in one channel only
  227. Water cooling Power Tubes
  228. Toroid Output Transformer from Plitron
  229. Scott LK-30 Assembly Manual Needed
  230. HUM STARTS 1 OR 2 HOUR AFTER THE AMP IS ON
  231. The best valve amp!
  232. Equivalents for 12AT7 and 6N11 ? (Sense G3 headphone amp)
  233. More probably stupid questions about feedback
  234. single stage amp?
  235. SS 83 again
  236. Making Spice Models for tubes
  237. Seth mk 2 ???
  238. Colorful inspiration
  239. Testing KT-90's Ei NIs Yugoslavia
  240. El Cheapo Transformer Question
  241. Why does the grid extend so far beyond the anode ?
  242. Valve amplifier identification
  243. E-M-field problem
  244. Effective cathode resistance
  245. Spectrum evaluation ECC82
  246. power d90-b
  247. el34, kt88, kt90, 6550 to 8417 conversion
  248. Do you know these capacitors?
  249. Vintage Capacitor Identification??
  250. GRAAF GAAFiti WFB ONE - Schematic needed