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  1. Heretical Source
  2. Broskie auto bias
  3. heater wiring - the Good the Bad and the Ugly
  4. AC Line Filter
  5. Counterpoint SA5000 Help
  6. Problem with ECC83 measurement values - please help
  7. Newbie Bias help ?
  8. AV305m AVVT
  9. Pot mechanical resistance and restoration..
  10. HMV Little Nipper mantle radio = 1 STEREO
  11. What's the simplest way to adjust filament voltage?
  12. GDAP-06
  13. Audio Note L6 - Schematic?
  14. Preventing HV flashover on socket pins
  15. Best "Vintage" Stereo Pres that SoftClip and lotsa Harmonics
  16. SE with PP OPT's?
  17. 12ax7/12AT7 Recommendations
  18. HELP: Eimac 75TL amp high frequency roll off
  19. unison reserch s8, let's build it!
  20. Where do super high end companies get their transformers?
  21. Tube Tester Panel Meter
  22. Attic find AMP
  23. Help getting Imax and Eb approximations for a push-pull amp
  24. Is this amp OK to buy, or is this a problem?
  25. Swirling Harmonics, can it be described
  26. Line stage with u-follower and nfb
  27. Newbie looking for help, pre-out to tube amp.
  28. Unison research integrated ampliphier schematics
  29. FET CCS anode load and RFI/oscillation.
  30. Old schematic
  31. Newbie Looking for Replacement OPTS Motorola Console Amp
  32. Merlyn- May AudioXpress
  33. How to clean tubes?
  34. does the 3A5 have the stones to drive a 2A3?
  35. New amp: 13DE7 SE hybrid
  36. My amp is motorboating, improve it with b+ regulator ?
  37. Can you identify these amps?
  38. Sowter SA01 - anyone used it ?
  39. Mikael‑Abdellah‑SE‑KT88 Bias & Voltage readings Help?
  40. Resistors and combinations
  41. thr light in pcl82
  42. Bogen L330 - Worth restoring?
  43. Supro model 24 amp transformers
  44. Those Magnificent Television Tubes
  45. Demagnetizing OPT?
  46. Real DIY fun hybrid testing.
  47. Extreme hum in EQ output
  48. 46 triode-strapped DHT spice model
  49. SET output impedance vs speaker impedance
  50. Help with layout of tube preamp
  51. eico HF-65
  52. Wirewound bias pot problem.
  53. Driver for Telefunken RS242 in class A2
  54. Help on my signal generator
  55. another tube fact or fallacy
  56. Gap in Transformer Lams - OCD Check
  57. how to test...
  58. chinese tube amp
  59. tube/valve pc-80
  60. GM-70 All done
  61. Peavey 60/60 classic series schematic
  62. preamp for reciever?
  63. Designing a Tube Rectifier Circuit
  64. Bogen RP40A transformers....what to build with them?
  65. Harmony guitar amp restoration questions
  66. Heads Up for "El Cheapo" Builders
  67. replacing kt66 valves
  68. Help with power transformer identification
  69. 6-8x el84 Per channel
  70. To vary a signal pentode to triode in stages
  71. I have 2 choices for resistive load, need opinions.
  72. Tesla PCC88 7DJ8 dual triode - Help Needed.
  73. PP6550
  74. LT1083 interesting startup problem
  75. ECC33 Driver Stage
  76. Hiraga's Improved Concertina Phase Splitter
  77. 274B a direct replacement for 5AR4/GZ34?
  78. Help power up akai M8 amps
  79. Sonic Frontiers Power 3 Help!
  80. ImPasse Preamp now online
  81. Power supply for tube preamplifier with PCC88
  82. Don't know where to start...
  83. DIY noob
  84. 300B amp cathode bypass
  85. Amp hum with Preamp off
  86. First Project with these tubes
  87. 7189a socket rewiring
  88. Hybrid rectifiers in PSUD2
  89. Feedback / experience wanted on building the Audio note L4 Integrated EL34 PP Amp Kit
  90. About 6AS7BTL Amp
  91. Output Stage Protection Circuit
  92. Silly basic layout question - AC heaters
  93. heater voltage variation for special tubes
  94. Want to build a 807 Vixen.. Looking for help.
  95. Connecting Speakers to Yaqin 10L
  96. Gyrator Filter
  97. 6ab4 tube socket mounting
  98. Any Moto heads? Need OT advice please
  99. Did I break my tube? (new blue glow)
  100. I need help with ccs based LTP
  101. 4033L- rare triode tube.
  102. Single tube linestage schematic wanted: 8CG7
  103. Tetra Sans PS
  104. Tone controls
  105. Vintage Heathkit Electronic Switch as soundcard interface
  106. K-12M extra caps??
  107. Looking for Tube Amp Kit Recommendations
  108. magnatone 280 schematic
  109. high voltage after cap. change
  110. My first tube amp
  111. Recommendations for 6888 triode operating point?
  112. Mullard 12AX7 part uniformity
  113. 6n15n-EB confusion
  114. Noob Question: Phono Preamp
  115. Transformer data required P782
  116. Snubbers on Power Transformer Secondaries
  117. CCS for 6V6 PP amp
  118. screen voltage for triode strapped pentode
  119. New Driver
  120. purpose and value importance of resistor
  121. Values for Vintage Amp's & Preamp's Paragon 12(70's) & More
  122. Help with amp please.
  123. Another Discrete Current Source
  124. 834 Triode amp
  125. Determing the reason for mystery? cap in schematic.
  126. Dyna ST70 to Dual-differential EL34 triode amp project
  127. Tube Signal to Noise Ratio / Dynamic Range
  128. fluctating bias
  129. Just tried a Wire Wound pot for volume.
  130. LED's in the cathode..
  131. Dr. Arthur Loesch
  132. Counterpoint SA-220 mods
  133. Broskie P-P Bridged Output Stage
  134. Would a member fluent in technical German please have a look at this link?
  135. Damaged tube? EL84
  136. Heathkit AA-161 EL84/6BQ5 PP mono integrated amp mod
  137. vk-2100 mod question please
  138. Heater supply
  139. 6111/6n16b - linestage noise problem
  140. OPT specs
  141. Re: Tube Line gain stage with pcc88 or ecc82
  142. Knight-kit KA-55
  143. Can I delay part of a B supply this way?
  144. Tube Preamp turn on circuit
  145. SE GM-70 for 700-800 euro?
  146. filter cap markings
  147. tube buffer noise cancellation
  148. PSUD 2
  149. Bypassing filter caps with Smaller caps
  150. balancing resister for series capacitor in a power supply
  151. Yaqin MC-100b- TJ Full Music 6sn7
  152. Forgive me for I have sinned. Help with Volume Pot!
  153. Help with diagnoses for leak 20 PLEASE
  154. Suggested Circuit Changes to use EM80 in place of 6E2 Eye
  155. Fred Nachbaur SET amp: input capacitor
  156. Heathkit scu 1 and knight kn924 needed schematics
  157. Journey to the centre of a tube..
  158. RIP Dr Jim Marshall
  159. some questions about an ECL82 SE amp
  160. Heathkit Sine/Square wave Generator Manual needed!
  161. SRPP Signal Output Capacitors
  162. simple se input impedance
  163. Kt120 screen current
  164. New or used output xformers to play around with?
  165. Magnavox amp
  166. Help hooking up panel ammeter for bias adjust
  167. opt A-440
  168. OTL Headphone amplifier with Tube ED8000
  169. NJ7P Gone?
  170. MYSTERY METAL TUBES B-1532
  171. noisy tubes
  172. Old amp hum repair
  173. Traveling with DIY Kit in USA-Airport Security Question
  174. Hammond 1650P vs 1650N For EL34 PP
  175. Calibrate a Hickok 6000?
  176. Blown Output Tubes
  177. Kriesler Radiogram refurbishment questions
  178. 6P15P socket connection
  179. Revision 2. Balanced
  180. 6V6 schematic
  181. 6h23N test setting?
  182. 12AH7GT
  183. TUBE Tape Head record / playback amp....
  184. Strange couple comportament 6L6GC RCA black plates.
  185. Reduce Output Volume
  186. Differential Amp CCS Tail SVCS Plate - Noise Issues
  187. Triode curves for EL/PL519
  188. Is that a SRPP circuit with 6SN7?
  189. KT33 Push Pull
  190. Rogers Cadet III Integrated Amp Capacitor Values help
  191. 2a3 alternative after NOS burning
  192. 6SN7 SRPP - oscillating dc offset
  193. Hickok TV-2 'percent quality'
  194. Another Tube I/V converter/preamp for balanced DACs with SE output:build thread
  195. Aikido LV 48V ECC99 or 6N6p
  196. Project: Ultra Small 6C33 / Hybrid Stereo Headphone Amplifier
  197. Back to the tubes
  198. Any use for these PAECO transformer?
  199. Video lectures on tube amplifier design
  200. Millett PP or Allen Wright's PP-2c or?
  201. Magnavox 8608-10
  202. Time relay
  203. Help with Music Angel XD800MKIII mods!?
  204. Little Dot MKIII ??????
  205. Cathode follower wideband amplifier
  206. Wrong base ???
  207. My first DIY schematic... need eagle eyes.!
  208. Stubborn Noise/Oscillation - Another Call for Help
  209. help with power tranny
  210. Tube Amp Repair - SE Michigan
  211. ST 70 Power on!
  212. given choice of low screen voltage or low bias which sounds better or is it equal
  213. How many various OEM brands come from Shuguang?
  214. Bye for now! :)
  215. general power tube output impedance chart?
  216. Should I ground my ST 70?
  217. What is the biggest 300B tube? (Dimension)
  218. 6N16 Valve break-in time
  219. Mystery Amp.
  220. valves tungsten filament
  221. Musical Machine (triode PP EL34) question(s)
  222. M100 Output Tube Problem!
  223. Need to replace the power switch on an EAR 859
  224. Eico pentode vs triode VA
  225. gold grid 5881 - was I had?
  226. DN2540 CCS questions
  227. Operating point for pp KT88
  228. Low THD of Opt Cathode feedback
  229. No bias in S-5 12K, 8L, 16L, etc?
  230. Wanted...broken Golden Tube Audio SE-40
  231. Precise 116 Data Needed
  232. Can you bi-wire using two different taps
  233. Transient Responce of Williamson Amp build
  234. Tantalum caps in the filament supply?
  235. Assistance needed in reconstructing a Golden Tube Audio SE-40
  236. interesting power tube comparison chart
  237. 833A and 3-500Z Circuits
  238. Pilot SA-260 amp and Fischer 400C advice
  239. Long tailed pair phase inverter issues
  240. advice on changing bridge rectifier
  241. 21st Century Maida Regulator
  242. 6CA7 UL Push Pull Amp Design
  243. Tube recommendations anyone?
  244. WE 2C51 Date codes
  245. T500-1 - any ideas?
  246. hybrid power amp and more questions
  247. Yaqin MC-100B - not as powerful as advertised, but still a good value.
  248. 6CB5 AMP BUILD.
  249. ABB France SE OPT??
  250. heater wiring

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