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  1. Can you identify these amps?
  2. Sowter SA01 - anyone used it ?
  3. Mikael‑Abdellah‑SE‑KT88 Bias & Voltage readings Help?
  4. Resistors and combinations
  5. thr light in pcl82
  6. Bogen L330 - Worth restoring?
  7. Supro model 24 amp transformers
  8. Those Magnificent Television Tubes
  9. Demagnetizing OPT?
  10. Real DIY fun hybrid testing.
  11. Extreme hum in EQ output
  12. 46 triode-strapped DHT spice model
  13. SET output impedance vs speaker impedance
  14. Help with layout of tube preamp
  15. eico HF-65
  16. Wirewound bias pot problem.
  17. Driver for Telefunken RS242 in class A2
  18. Help on my signal generator
  19. another tube fact or fallacy
  20. Gap in Transformer Lams - OCD Check
  21. how to test...
  22. chinese tube amp
  23. tube/valve pc-80
  24. GM-70 All done
  25. Peavey 60/60 classic series schematic
  26. preamp for reciever?
  27. Designing a Tube Rectifier Circuit
  28. Bogen RP40A transformers....what to build with them?
  29. Harmony guitar amp restoration questions
  30. Heads Up for "El Cheapo" Builders
  31. replacing kt66 valves
  32. Help with power transformer identification
  33. 6-8x el84 Per channel
  34. To vary a signal pentode to triode in stages
  35. I have 2 choices for resistive load, need opinions.
  36. Tesla PCC88 7DJ8 dual triode - Help Needed.
  37. PP6550
  38. LT1083 interesting startup problem
  39. ECC33 Driver Stage
  40. Hiraga's Improved Concertina Phase Splitter
  41. 274B a direct replacement for 5AR4/GZ34?
  42. Help power up akai M8 amps
  43. Sonic Frontiers Power 3 Help!
  44. ImPasse Preamp now online
  45. Power supply for tube preamplifier with PCC88
  46. Don't know where to start...
  47. DIY noob
  48. 300B amp cathode bypass
  49. Amp hum with Preamp off
  50. First Project with these tubes
  51. 7189a socket rewiring
  52. Hybrid rectifiers in PSUD2
  53. Feedback / experience wanted on building the Audio note L4 Integrated EL34 PP Amp Kit
  54. About 6AS7BTL Amp
  55. Output Stage Protection Circuit
  56. Silly basic layout question - AC heaters
  57. heater voltage variation for special tubes
  58. Want to build a 807 Vixen.. Looking for help.
  59. Connecting Speakers to Yaqin 10L
  60. Gyrator Filter
  61. 6ab4 tube socket mounting
  62. Any Moto heads? Need OT advice please
  63. Did I break my tube? (new blue glow)
  64. I need help with ccs based LTP
  65. 4033L- rare triode tube.
  66. Single tube linestage schematic wanted: 8CG7
  67. Tetra Sans PS
  68. Tone controls
  69. Vintage Heathkit Electronic Switch as soundcard interface
  70. K-12M extra caps??
  71. Looking for Tube Amp Kit Recommendations
  72. magnatone 280 schematic
  73. high voltage after cap. change
  74. My first tube amp
  75. Recommendations for 6888 triode operating point?
  76. Mullard 12AX7 part uniformity
  77. 6n15n-EB confusion
  78. Noob Question: Phono Preamp
  79. Transformer data required P782
  80. Snubbers on Power Transformer Secondaries
  81. CCS for 6V6 PP amp
  82. screen voltage for triode strapped pentode
  83. New Driver
  84. purpose and value importance of resistor
  85. Values for Vintage Amp's & Preamp's Paragon 12(70's) & More
  86. Help with amp please.
  87. Another Discrete Current Source
  88. 834 Triode amp
  89. Determing the reason for mystery? cap in schematic.
  90. Dyna ST70 to Dual-differential EL34 triode amp project
  91. Tube Signal to Noise Ratio / Dynamic Range
  92. fluctating bias
  93. Just tried a Wire Wound pot for volume.
  94. LED's in the cathode..
  95. Dr. Arthur Loesch
  96. Counterpoint SA-220 mods
  97. Broskie P-P Bridged Output Stage
  98. Would a member fluent in technical German please have a look at this link?
  99. Damaged tube? EL84
  100. Heathkit AA-161 EL84/6BQ5 PP mono integrated amp mod
  101. vk-2100 mod question please
  102. Heater supply
  103. 6111/6n16b - linestage noise problem
  104. OPT specs
  105. Re: Tube Line gain stage with pcc88 or ecc82
  106. Knight-kit KA-55
  107. Can I delay part of a B supply this way?
  108. Tube Preamp turn on circuit
  109. SE GM-70 for 700-800 euro?
  110. filter cap markings
  111. tube buffer noise cancellation
  112. PSUD 2
  113. Bypassing filter caps with Smaller caps
  114. balancing resister for series capacitor in a power supply
  115. Yaqin MC-100b- TJ Full Music 6sn7
  116. Forgive me for I have sinned. Help with Volume Pot!
  117. Help with diagnoses for leak 20 PLEASE
  118. Suggested Circuit Changes to use EM80 in place of 6E2 Eye
  119. Fred Nachbaur SET amp: input capacitor
  120. Heathkit scu 1 and knight kn924 needed schematics
  121. Journey to the centre of a tube..
  122. RIP Dr Jim Marshall
  123. some questions about an ECL82 SE amp
  124. Heathkit Sine/Square wave Generator Manual needed!
  125. SRPP Signal Output Capacitors
  126. simple se input impedance
  127. Kt120 screen current
  128. New or used output xformers to play around with?
  129. Magnavox amp
  130. Help hooking up panel ammeter for bias adjust
  131. opt A-440
  132. OTL Headphone amplifier with Tube ED8000
  133. NJ7P Gone?
  134. MYSTERY METAL TUBES B-1532
  135. noisy tubes
  136. Old amp hum repair
  137. Traveling with DIY Kit in USA-Airport Security Question
  138. Hammond 1650P vs 1650N For EL34 PP
  139. Calibrate a Hickok 6000?
  140. Blown Output Tubes
  141. Kriesler Radiogram refurbishment questions
  142. 6P15P socket connection
  143. Revision 2. Balanced
  144. 6V6 schematic
  145. 6h23N test setting?
  146. 12AH7GT
  147. TUBE Tape Head record / playback amp....
  148. Strange couple comportament 6L6GC RCA black plates.
  149. Reduce Output Volume
  150. Differential Amp CCS Tail SVCS Plate - Noise Issues
  151. Triode curves for EL/PL519
  152. Is that a SRPP circuit with 6SN7?
  153. KT33 Push Pull
  154. Rogers Cadet III Integrated Amp Capacitor Values help
  155. 2a3 alternative after NOS burning
  156. 6SN7 SRPP - oscillating dc offset
  157. Hickok TV-2 'percent quality'
  158. Another Tube I/V converter/preamp for balanced DACs with SE output:build thread
  159. Aikido LV 48V ECC99 or 6N6p
  160. Project: Ultra Small 6C33 / Hybrid Stereo Headphone Amplifier
  161. Back to the tubes
  162. Any use for these PAECO transformer?
  163. Video lectures on tube amplifier design
  164. Millett PP or Allen Wright's PP-2c or?
  165. Magnavox 8608-10
  166. Time relay
  167. Help with Music Angel XD800MKIII mods!?
  168. Little Dot MKIII ??????
  169. Cathode follower wideband amplifier
  170. Wrong base ???
  171. My first DIY schematic... need eagle eyes.!
  172. Stubborn Noise/Oscillation - Another Call for Help
  173. help with power tranny
  174. Tube Amp Repair - SE Michigan
  175. ST 70 Power on!
  176. given choice of low screen voltage or low bias which sounds better or is it equal
  177. How many various OEM brands come from Shuguang?
  178. Bye for now! :)
  179. general power tube output impedance chart?
  180. Should I ground my ST 70?
  181. What is the biggest 300B tube? (Dimension)
  182. 6N16 Valve break-in time
  183. Mystery Amp.
  184. valves tungsten filament
  185. Musical Machine (triode PP EL34) question(s)
  186. M100 Output Tube Problem!
  187. Need to replace the power switch on an EAR 859
  188. Eico pentode vs triode VA
  189. gold grid 5881 - was I had?
  190. DN2540 CCS questions
  191. Operating point for pp KT88
  192. Low THD of Opt Cathode feedback
  193. No bias in S-5 12K, 8L, 16L, etc?
  194. Wanted...broken Golden Tube Audio SE-40
  195. Precise 116 Data Needed
  196. Can you bi-wire using two different taps
  197. Transient Responce of Williamson Amp build
  198. Tantalum caps in the filament supply?
  199. Assistance needed in reconstructing a Golden Tube Audio SE-40
  200. interesting power tube comparison chart
  201. 833A and 3-500Z Circuits
  202. Pilot SA-260 amp and Fischer 400C advice
  203. Long tailed pair phase inverter issues
  204. advice on changing bridge rectifier
  205. 21st Century Maida Regulator
  206. 6CA7 UL Push Pull Amp Design
  207. Tube recommendations anyone?
  208. WE 2C51 Date codes
  209. T500-1 - any ideas?
  210. hybrid power amp and more questions
  211. Yaqin MC-100B - not as powerful as advertised, but still a good value.
  212. 6CB5 AMP BUILD.
  213. ABB France SE OPT??
  214. heater wiring
  215. Audioromy FU29 improvement and upgrades?
  216. Need VFD display filament driver
  217. Power Transformer Limitations
  218. Yaqin 100b channel imbalance
  219. Grid stoppers in class AB2 push-pull arrangenets?
  220. Glass bead inside of KT88
  221. Find tube tester!
  222. mono block amps with 2 x 833C overkill ? even possible to DIY?
  223. happiness is a box of 6550 NOS tubes
  224. Taming the 83
  225. 6550 tube bias characters
  226. Tube Amp Squeel
  227. Bias help Music Angel L$, EL84
  228. Stubborn Oscillation
  229. Moderm "high watt" resistors seem too small
  230. Thyratron based emergency switch?
  231. vT4C.com out of business....
  232. Maggie 8802 6V6
  233. Need Counterpoint SA-3 Board Photo
  234. Diodes in a Graetz Hybrid
  235. Tube Noob with a few questions
  236. KT88 Push Pull Idea... Questions
  237. Superior Instruments tv11 restore question?
  238. Superior Instruments tv11 restore question?
  239. Frequency Response of Output Tubes
  240. symptom of a dying (gain) tube
  241. Grounding in monoblock amps
  242. Seeking 6ME5 data and connection diagram
  243. 12BK5 UL tracing gone boosted triode?
  244. Difference between OPT
  245. Tweaking PP AMP Suggestions Please
  246. DC coupled Sand 'n Glass with Current Feedback
  247. Yaqin 100B fire and spares
  248. Pls help with a preamp
  249. Questions about Aikdo all in one octal
  250. Did I get used to my amp's sound?

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