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  1. SET output impedance vs speaker impedance
  2. Help with layout of tube preamp
  3. eico HF-65
  4. Wirewound bias pot problem.
  5. Driver for Telefunken RS242 in class A2
  6. Help on my signal generator
  7. another tube fact or fallacy
  8. Gap in Transformer Lams - OCD Check
  9. how to test...
  10. chinese tube amp
  11. tube/valve pc-80
  12. GM-70 All done
  13. preamp for reciever?
  14. Designing a Tube Rectifier Circuit
  15. Bogen RP40A transformers....what to build with them?
  16. Heads Up for "El Cheapo" Builders
  17. replacing kt66 valves
  18. Help with power transformer identification
  19. 6-8x el84 Per channel
  20. To vary a signal pentode to triode in stages
  21. I have 2 choices for resistive load, need opinions.
  22. Tesla PCC88 7DJ8 dual triode - Help Needed.
  23. PP6550
  24. LT1083 interesting startup problem
  25. ECC33 Driver Stage
  26. Hiraga's Improved Concertina Phase Splitter
  27. 274B a direct replacement for 5AR4/GZ34?
  28. Help power up akai M8 amps
  29. Sonic Frontiers Power 3 Help!
  30. ImPasse Preamp now online
  31. Power supply for tube preamplifier with PCC88
  32. Don't know where to start...
  33. DIY noob
  34. 300B amp cathode bypass
  35. Amp hum with Preamp off
  36. First Project with these tubes
  37. 7189a socket rewiring
  38. Hybrid rectifiers in PSUD2
  39. Feedback / experience wanted on building the Audio note L4 Integrated EL34 PP Amp Kit
  40. About 6AS7BTL Amp
  41. Output Stage Protection Circuit
  42. Silly basic layout question - AC heaters
  43. heater voltage variation for special tubes
  44. Want to build a 807 Vixen.. Looking for help.
  45. Connecting Speakers to Yaqin 10L
  46. Gyrator Filter
  47. 6ab4 tube socket mounting
  48. Any Moto heads? Need OT advice please
  49. Did I break my tube? (new blue glow)
  50. I need help with ccs based LTP
  51. 4033L- rare triode tube.
  52. Single tube linestage schematic wanted: 8CG7
  53. Tetra Sans PS
  54. Tone controls
  55. Vintage Heathkit Electronic Switch as soundcard interface
  56. K-12M extra caps??
  57. Looking for Tube Amp Kit Recommendations
  58. high voltage after cap. change
  59. My first tube amp
  60. Recommendations for 6888 triode operating point?
  61. Mullard 12AX7 part uniformity
  62. 6n15n-EB confusion
  63. Noob Question: Phono Preamp
  64. Transformer data required P782
  65. Snubbers on Power Transformer Secondaries
  66. CCS for 6V6 PP amp
  67. screen voltage for triode strapped pentode
  68. New Driver
  69. purpose and value importance of resistor
  70. Values for Vintage Amp's & Preamp's Paragon 12(70's) & More
  71. Help with amp please.
  72. Another Discrete Current Source
  73. 834 Triode amp
  74. Determing the reason for mystery? cap in schematic.
  75. Dyna ST70 to Dual-differential EL34 triode amp project
  76. Tube Signal to Noise Ratio / Dynamic Range
  77. fluctating bias
  78. Just tried a Wire Wound pot for volume.
  79. LED's in the cathode..
  80. Dr. Arthur Loesch
  81. Counterpoint SA-220 mods
  82. Broskie P-P Bridged Output Stage
  83. Would a member fluent in technical German please have a look at this link?
  84. Damaged tube? EL84
  85. Heathkit AA-161 EL84/6BQ5 PP mono integrated amp mod
  86. vk-2100 mod question please
  87. Heater supply
  88. 6111/6n16b - linestage noise problem
  89. OPT specs
  90. Re: Tube Line gain stage with pcc88 or ecc82
  91. Knight-kit KA-55
  92. Can I delay part of a B supply this way?
  93. Tube Preamp turn on circuit
  94. SE GM-70 for 700-800 euro?
  95. filter cap markings
  96. tube buffer noise cancellation
  97. PSUD 2
  98. balancing resister for series capacitor in a power supply
  99. Yaqin MC-100b- TJ Full Music 6sn7
  100. Forgive me for I have sinned. Help with Volume Pot!
  101. Help with diagnoses for leak 20 PLEASE
  102. Suggested Circuit Changes to use EM80 in place of 6E2 Eye
  103. Fred Nachbaur SET amp: input capacitor
  104. Heathkit scu 1 and knight kn924 needed schematics
  105. Journey to the centre of a tube..
  106. some questions about an ECL82 SE amp
  107. Heathkit Sine/Square wave Generator Manual needed!
  108. SRPP Signal Output Capacitors
  109. Kt120 screen current
  110. New or used output xformers to play around with?
  111. Magnavox amp
  112. Help hooking up panel ammeter for bias adjust
  113. opt A-440
  114. OTL Headphone amplifier with Tube ED8000
  115. NJ7P Gone?
  116. MYSTERY METAL TUBES B-1532
  117. noisy tubes
  118. Old amp hum repair
  119. Traveling with DIY Kit in USA-Airport Security Question
  120. Hammond 1650P vs 1650N For EL34 PP
  121. Blown Output Tubes
  122. Kriesler Radiogram refurbishment questions
  123. 6P15P socket connection
  124. Revision 2. Balanced
  125. 6V6 schematic
  126. 6h23N test setting?
  127. 12AH7GT
  128. TUBE Tape Head record / playback amp....
  129. Strange couple comportament 6L6GC RCA black plates.
  130. Reduce Output Volume
  131. Differential Amp CCS Tail SVCS Plate - Noise Issues
  132. Triode curves for EL/PL519
  133. Is that a SRPP circuit with 6SN7?
  134. KT33 Push Pull
  135. Rogers Cadet III Integrated Amp Capacitor Values help
  136. 2a3 alternative after NOS burning
  137. 6SN7 SRPP - oscillating dc offset
  138. Another Tube I/V converter/preamp for balanced DACs with SE output:build thread
  139. Aikido LV 48V ECC99 or 6N6p
  140. Project: Ultra Small 6C33 / Hybrid Stereo Headphone Amplifier
  141. Back to the tubes
  142. Any use for these PAECO transformer?
  143. Video lectures on tube amplifier design
  144. Millett PP or Allen Wright's PP-2c or?
  145. Magnavox 8608-10
  146. Time relay
  147. Help with Music Angel XD800MKIII mods!?
  148. Little Dot MKIII ??????
  149. Cathode follower wideband amplifier
  150. Wrong base ???
  151. My first DIY schematic... need eagle eyes.!
  152. Stubborn Noise/Oscillation - Another Call for Help
  153. help with power tranny
  154. Tube Amp Repair - SE Michigan
  155. ST 70 Power on!
  156. given choice of low screen voltage or low bias which sounds better or is it equal
  157. How many various OEM brands come from Shuguang?
  158. Bye for now! :)
  159. general power tube output impedance chart?
  160. Should I ground my ST 70?
  161. What is the biggest 300B tube? (Dimension)
  162. 6N16 Valve break-in time
  163. Mystery Amp.
  164. valves tungsten filament
  165. Musical Machine (triode PP EL34) question(s)
  166. M100 Output Tube Problem!
  167. Need to replace the power switch on an EAR 859
  168. Eico pentode vs triode VA
  169. gold grid 5881 - was I had?
  170. DN2540 CCS questions
  171. Operating point for pp KT88
  172. Low THD of Opt Cathode feedback
  173. No bias in S-5 12K, 8L, 16L, etc?
  174. Wanted...broken Golden Tube Audio SE-40
  175. Precise 116 Data Needed
  176. Can you bi-wire using two different taps
  177. Transient Responce of Williamson Amp build
  178. Assistance needed in reconstructing a Golden Tube Audio SE-40
  179. interesting power tube comparison chart
  180. 833A and 3-500Z Circuits
  181. Pilot SA-260 amp and Fischer 400C advice
  182. Long tailed pair phase inverter issues
  183. advice on changing bridge rectifier
  184. 21st Century Maida Regulator
  185. 6CA7 UL Push Pull Amp Design
  186. Tube recommendations anyone?
  187. WE 2C51 Date codes
  188. T500-1 - any ideas?
  189. hybrid power amp and more questions
  190. Yaqin MC-100B - not as powerful as advertised, but still a good value.
  191. 6CB5 AMP BUILD.
  192. ABB France SE OPT??
  193. heater wiring
  194. Audioromy FU29 improvement and upgrades?
  195. Need VFD display filament driver
  196. Power Transformer Limitations
  197. Yaqin 100b channel imbalance
  198. Grid stoppers in class AB2 push-pull arrangenets?
  199. Glass bead inside of KT88
  200. mono block amps with 2 x 833C overkill ? even possible to DIY?
  201. happiness is a box of 6550 NOS tubes
  202. Taming the 83
  203. 6550 tube bias characters
  204. Tube Amp Squeel
  205. Bias help Music Angel L$, EL84
  206. Stubborn Oscillation
  207. Moderm "high watt" resistors seem too small
  208. Thyratron based emergency switch?
  209. vT4C.com out of business....
  210. Maggie 8802 6V6
  211. Need Counterpoint SA-3 Board Photo
  212. Diodes in a Graetz Hybrid
  213. Tube Noob with a few questions
  214. KT88 Push Pull Idea... Questions
  215. Superior Instruments tv11 restore question?
  216. Superior Instruments tv11 restore question?
  217. Frequency Response of Output Tubes
  218. symptom of a dying (gain) tube
  219. Grounding in monoblock amps
  220. Seeking 6ME5 data and connection diagram
  221. 12BK5 UL tracing gone boosted triode?
  222. Difference between OPT
  223. Tweaking PP AMP Suggestions Please
  224. DC coupled Sand 'n Glass with Current Feedback
  225. Yaqin 100B fire and spares
  226. Pls help with a preamp
  227. Questions about Aikdo all in one octal
  228. Did I get used to my amp's sound?
  229. Michaelson and Austin TVA1 revB
  230. Joy of birth - a new preamp brought to the world
  231. 5U4G
  232. 6N6P best musicality? Help with modes.
  233. Identifying this capacitor in my Cayin TA-30 amp
  234. GU50 Push-Pull version1
  235. Common mode feedback
  236. Stuck with repair ;(
  237. active hum cancellation. PCB idea?
  238. Why this huge cap is so light?
  239. OPT performance
  240. Tung Sol ECC803S reissue - thumbs down
  241. In a search for a 6CG7 line stage schematic
  242. Output stage for a Mono FM tube tuner
  243. Want to use El Cheapo P.I. for Scott LK72 rebuild
  244. TO220 isolation kits breakdown
  245. Schematic for Sony TC-200 tape unit
  246. HV power supply with serial chokes
  247. no logo on tube
  248. Tango XE-20-600S SE OPT for preamp ?
  249. RF Voltage Amplifier
  250. Anyone deal with psvane member here?

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