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  1. Looking for constructive criticism on my first design
  2. Audio note kit 1 vs Meishu
  3. Tube Amp Gain V.S. RF Gain
  4. Kool-mu material for building audio transformer
  5. Buzz/Hum in Matrix amplifier
  6. Optimation PA-250AC Lab-Grade Audio Amplifier
  7. RS1003 in SE triode-UL monoblocks
  8. Bypass capacitors in Tube amps
  9. Basic question re: gNFB around 3 stages
  10. James PP Audio Transformers, any good?
  11. Seeking advice for tube amp kit on,seems to be, chinese site
  12. Tube pricing from 1981
  13. 6e5p WCF headphone amp with no cap!
  14. "How it's made" vacuum tubes..
  15. Citation I and IV phono schematic query
  16. GS-4V High-mu russian triode for RIAA preamp
  17. good source for amp chassis in europe?
  18. Help identify and replacement of ? resistor
  19. New tube amp diy kit required power?
  20. Decoupling DC heater supply between valves..benefit?
  21. The Aikido Comedy: Straight Talk
  22. Recapping tube preamp questions
  23. A tube amp that's actually a tesla coil.
  24. Tube "Orientation"
  25. 18 watt tremolo vvr
  26. Pre amp output, would this work?
  27. Aikido Power Amp.....Possible??
  28. 12AX7 questions
  29. 6550 PUSH-PULL
  30. CCS at plate? Unknown schematic part
  31. Most odd grid choke behaviour.
  32. Spec for Altec TP-404 Transformer
  33. why do wimpy drivers for 2A3 work as well as they do?
  34. Seeking advice on Tube buffer / pre-amp
  35. 8x Push-pull KT88 class A in triode mode
  36. Tube Pre dull into Tube Amp - cause ?
  37. FINALLY I can start building my GM70
  38. Russian triodes ГИ-15Б arriving in a few days
  39. Cap or resistor
  40. KT88/PP driver confusion
  41. Simple SE GU-50
  42. Darling 1626
  43. 01a DHT Preamp
  44. Suitable tubes for Gomes output
  45. phono line stage project
  46. Whats wrong with this circuit?
  47. Any Newcomb Gurus.?
  48. Preamp Tube MU Level?
  49. SRPP Paraccordion topology ?
  50. Replacing 6922 with 6FQ7 in Conrad Johnson ET3 preamp
  51. Modification of a Chinese KT90 PP amplifier
  52. Tricky Headphone Amp design for AK4396
  53. How to know voltage bias adjustmentwith this data?
  54. Strange Stability Enhancement Trick
  55. has anyone bought tubes from http://www.tangotubes.com/
  56. “Earmax / G3 / Morgan Jones / Cavalli” Headphone Amp Reissue with 6SN7 Steroids
  57. Ever heard of British transofmer company "Ro"?
  58. A friend gave me some random tubes...
  59. Replacement for 6e2 without vu
  60. PP GU50 triode strapped project
  61. Tube VAS stage questions???
  62. OT impedance help: 9.8 vs 8k
  63. popping & crackling noise from restored valve AM radio
  64. Choosing 6550 PP Output Transformer
  65. Reversing Interstage Transformer
  66. Aikido 9 pin All in One Build
  67. KT88 PP UL Design Help Needed
  68. Cayin A-300B schematic needed
  69. Please Recommend a Preamp!
  70. Which Antek transforms to use
  71. Integrated Amp as Preamp and Subwoofer amp
  72. Uses for 715C Pulse Tetrode
  73. PP KT-88 w/866A MV HT Supply
  74. EC88 (6DL4) NOS Mullard - any use at all?
  75. Advice sought on thermionic headphone amp
  76. Eico HF-81: Input Selector bypass
  77. 12b4 bass rolloff problem
  78. No Right ch sound on yaqin mc10l
  79. tester causing bias to rise?
  80. Heaters & Filaments: AC vs. DC
  81. Old HP power transformers... need some wiring advice!
  82. Old HP power transformers... need some wiring advice!
  83. RCA RS177H just dosen't sound right! Caps?
  84. silicon or tube rectifier in an EL34 SE
  85. Help original 300G LEGACY
  86. 813 Tube-Steak!
  87. Basic 12AU7 heatrr question
  88. Shipping a vacuum tube to China
  89. 6DJ8/ECC88-SRPP Tube Preamplifier
  90. Help needed: hum noise in Eimac 250TL driven by 75TL Single End Amplifier
  91. Found tons of Tubes,and many other parts
  92. EZ80 Data Sheets, R-Lim and Max Cap
  93. Filament Voltages CT vs Non-CT
  94. Troubleshooting help needed
  95. What is it? Tube guessology
  96. Bass & Treble controls, or rather lack of.
  97. Quicksilver 8417 Power Supply Question
  98. Why a sudden distortion in treble of this SET amplifier?
  99. Antitriode PP with EL34
  100. How to calculate Pout for Push Pull design
  101. Newbie Question - Power Transformer vs Isolation Transformer
  102. All tubes red plating
  103. Exceeding bias voltage?
  104. Vacuum State RTP Preamp Problem
  105. Alfred Morgan Tube Preamplifier
  106. 845 vs GM70
  107. Looking for project suggestions - 12au7 pre-amp?
  108. Contemporary tradition breaking amp schematics.
  109. ul - triode coupled screen grid resistor
  110. Optimum driver valve for an interstage-transformer-driven SE 300B
  111. 6C33C
  112. Soundcraftsmen 5050
  113. Tetra Phono Question
  114. WF tube
  115. Opt laminations isolation
  116. Heretical Source
  117. Broskie auto bias
  118. Heater Wiring - the Good the Bad and the Ugly
  119. AC Line Filter
  120. Counterpoint SA5000 Help
  121. Problem with ECC83 measurement values - please help
  122. Newbie Bias help ?
  123. AV305m AVVT
  124. Pot mechanical resistance and restoration..
  125. HMV Little Nipper mantle radio = 1 STEREO
  126. What's the simplest way to adjust filament voltage?
  127. GDAP-06
  128. Audio Note L6 - Schematic?
  129. Preventing HV flashover on socket pins
  130. Best "Vintage" Stereo Pres that SoftClip and lotsa Harmonics
  131. SE with PP OPT's?
  132. 12ax7/12AT7 Recommendations
  133. HELP: Eimac 75TL amp high frequency roll off
  134. unison reserch s8, let's build it!
  135. Where do super high end companies get their transformers?
  136. Tube Tester Panel Meter
  137. Attic find AMP
  138. Help getting Imax and Eb approximations for a push-pull amp
  139. Is this amp OK to buy, or is this a problem?
  140. Swirling Harmonics, can it be described
  141. Line stage with u-follower and nfb
  142. Newbie looking for help, pre-out to tube amp.
  143. Unison research integrated ampliphier schematics
  144. FET CCS anode load and RFI/oscillation.
  145. Old schematic
  146. Newbie Looking for Replacement OPTS Motorola Console Amp
  147. Merlyn- May AudioXpress
  148. How to clean tubes?
  149. does the 3A5 have the stones to drive a 2A3?
  150. New amp: 13DE7 SE hybrid
  151. My amp is motorboating, improve it with b+ regulator ?
  152. Can you identify these amps?
  153. Sowter SA01 - anyone used it ?
  154. Mikael‑Abdellah‑SE‑KT88 Bias & Voltage readings Help?
  155. Resistors and combinations
  156. thr light in pcl82
  157. Bogen L330 - Worth restoring?
  158. Those Magnificent Television Tubes
  159. Demagnetizing OPT?
  160. Real DIY fun hybrid testing.
  161. Extreme hum in EQ output
  162. 46 triode-strapped DHT spice model
  163. SET output impedance vs speaker impedance
  164. Help with layout of tube preamp
  165. eico HF-65
  166. Wirewound bias pot problem.
  167. Driver for Telefunken RS242 in class A2
  168. Help on my signal generator
  169. another tube fact or fallacy
  170. Gap in Transformer Lams - OCD Check
  171. how to test...
  172. chinese tube amp
  173. tube/valve pc-80
  174. GM-70 All done
  175. preamp for reciever?
  176. Designing a Tube Rectifier Circuit
  177. Bogen RP40A transformers....what to build with them?
  178. Heads Up for "El Cheapo" Builders
  179. replacing kt66 valves
  180. Help with power transformer identification
  181. 6-8x el84 Per channel
  182. To vary a signal pentode to triode in stages
  183. I have 2 choices for resistive load, need opinions.
  184. Tesla PCC88 7DJ8 dual triode - Help Needed.
  185. PP6550
  186. LT1083 interesting startup problem
  187. ECC33 Driver Stage
  188. Hiraga's Improved Concertina Phase Splitter
  189. 274B a direct replacement for 5AR4/GZ34?
  190. Help power up akai M8 amps
  191. Sonic Frontiers Power 3 Help!
  192. ImPasse Preamp now online
  193. Power supply for tube preamplifier with PCC88
  194. Don't know where to start...
  195. DIY noob
  196. 300B amp cathode bypass
  197. Amp hum with Preamp off
  198. First Project with these tubes
  199. 7189a socket rewiring
  200. Hybrid rectifiers in PSUD2
  201. Feedback / experience wanted on building the Audio note L4 Integrated EL34 PP Amp Kit
  202. About 6AS7BTL Amp
  203. Output Stage Protection Circuit
  204. Silly basic layout question - AC heaters
  205. heater voltage variation for special tubes
  206. Want to build a 807 Vixen.. Looking for help.
  207. Connecting Speakers to Yaqin 10L
  208. Gyrator Filter
  209. 6ab4 tube socket mounting
  210. Any Moto heads? Need OT advice please
  211. Did I break my tube? (new blue glow)
  212. I need help with ccs based LTP
  213. 4033L- rare triode tube.
  214. Single tube linestage schematic wanted: 8CG7
  215. Tetra Sans PS
  216. Tone controls
  217. Vintage Heathkit Electronic Switch as soundcard interface
  218. K-12M extra caps??
  219. Looking for Tube Amp Kit Recommendations
  220. high voltage after cap. change
  221. My first tube amp
  222. Recommendations for 6888 triode operating point?
  223. Mullard 12AX7 part uniformity
  224. 6n15n-EB confusion
  225. Noob Question: Phono Preamp
  226. Transformer data required P782
  227. Snubbers on Power Transformer Secondaries
  228. CCS for 6V6 PP amp
  229. screen voltage for triode strapped pentode
  230. New Driver
  231. purpose and value importance of resistor
  232. Values for Vintage Amp's & Preamp's Paragon 12(70's) & More
  233. Help with amp please.
  234. Another Discrete Current Source
  235. 834 Triode amp
  236. Determing the reason for mystery? cap in schematic.
  237. Dyna ST70 to Dual-differential EL34 triode amp project
  238. Tube Signal to Noise Ratio / Dynamic Range
  239. fluctating bias
  240. Just tried a Wire Wound pot for volume.
  241. LED's in the cathode..
  242. Dr. Arthur Loesch
  243. Counterpoint SA-220 mods
  244. Broskie P-P Bridged Output Stage
  245. Would a member fluent in technical German please have a look at this link?
  246. Damaged tube? EL84
  247. Heathkit AA-161 EL84/6BQ5 PP mono integrated amp mod
  248. vk-2100 mod question please
  249. Heater supply
  250. 6111/6n16b - linestage noise problem

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