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  1. Replacing 6922 with 6FQ7 in Conrad Johnson ET3 preamp
  2. Modification of a Chinese KT90 PP amplifier
  3. Tricky Headphone Amp design for AK4396
  4. How to know voltage bias adjustmentwith this data?
  5. Strange Stability Enhancement Trick
  6. has anyone bought tubes from http://www.tangotubes.com/
  7. “Earmax / G3 / Morgan Jones / Cavalli” Headphone Amp Reissue with 6SN7 Steroids
  8. Ever heard of British transofmer company "Ro"?
  9. A friend gave me some random tubes...
  10. Replacement for 6e2 without vu
  11. PP GU50 triode strapped project
  12. Tube VAS stage questions???
  13. OT impedance help: 9.8 vs 8k
  14. popping & crackling noise from restored valve AM radio
  15. Choosing 6550 PP Output Transformer
  16. Reversing Interstage Transformer
  17. Aikido 9 pin All in One Build
  18. KT88 PP UL Design Help Needed
  19. Cayin A-300B schematic needed
  20. Please Recommend a Preamp!
  21. Which Antek transforms to use
  22. Integrated Amp as Preamp and Subwoofer amp
  23. Uses for 715C Pulse Tetrode
  24. PP KT-88 w/866A MV HT Supply
  25. EC88 (6DL4) NOS Mullard - any use at all?
  26. Advice sought on thermionic headphone amp
  27. Eico HF-81: Input Selector bypass
  28. 12b4 bass rolloff problem
  29. No Right ch sound on yaqin mc10l
  30. tester causing bias to rise?
  31. Heaters & Filaments: AC vs. DC
  32. Old HP power transformers... need some wiring advice!
  33. Old HP power transformers... need some wiring advice!
  34. RCA RS177H just dosen't sound right! Caps?
  35. silicon or tube rectifier in an EL34 SE
  36. Help original 300G LEGACY
  37. 813 Tube-Steak!
  38. Basic 12AU7 heatrr question
  39. Shipping a vacuum tube to China
  40. 6DJ8/ECC88-SRPP Tube Preamplifier
  41. Help needed: hum noise in Eimac 250TL driven by 75TL Single End Amplifier
  42. Found tons of Tubes,and many other parts
  43. Ampeg B15 Heritage Clone Help
  44. EZ80 Data Sheets, R-Lim and Max Cap
  45. Filament Voltages CT vs Non-CT
  46. Troubleshooting help needed
  47. What is it? Tube guessology
  48. Bass & Treble controls, or rather lack of.
  49. Quicksilver 8417 Power Supply Question
  50. Why a sudden distortion in treble of this SET amplifier?
  51. 5f1 Champ grounding
  52. Antitriode PP with EL34
  53. How to calculate Pout for Push Pull design
  54. Newbie Question - Power Transformer vs Isolation Transformer
  55. All tubes red plating
  56. Exceeding bias voltage?
  57. Vacuum State RTP Preamp Problem
  58. Alfred Morgan Tube Preamplifier
  59. 845 vs GM70
  60. Looking for project suggestions - 12au7 pre-amp?
  61. Contemporary tradition breaking amp schematics.
  62. ul - triode coupled screen grid resistor
  63. Optimum driver valve for an interstage-transformer-driven SE 300B
  64. 6C33C
  65. Soundcraftsmen 5050
  66. Tetra Phono Question
  67. WF tube
  68. Opt laminations isolation
  69. Heretical Source
  70. Broskie auto bias
  71. heater wiring - the Good the Bad and the Ugly
  72. AC Line Filter
  73. Counterpoint SA5000 Help
  74. Problem with ECC83 measurement values - please help
  75. Newbie Bias help ?
  76. AV305m AVVT
  77. Pot mechanical resistance and restoration..
  78. HMV Little Nipper mantle radio = 1 STEREO
  79. What's the simplest way to adjust filament voltage?
  80. GDAP-06
  81. Audio Note L6 - Schematic?
  82. Preventing HV flashover on socket pins
  83. Best "Vintage" Stereo Pres that SoftClip and lotsa Harmonics
  84. SE with PP OPT's?
  85. 12ax7/12AT7 Recommendations
  86. HELP: Eimac 75TL amp high frequency roll off
  87. unison reserch s8, let's build it!
  88. Where do super high end companies get their transformers?
  89. Tube Tester Panel Meter
  90. Attic find AMP
  91. Help getting Imax and Eb approximations for a push-pull amp
  92. Is this amp OK to buy, or is this a problem?
  93. Swirling Harmonics, can it be described
  94. Line stage with u-follower and nfb
  95. Newbie looking for help, pre-out to tube amp.
  96. Unison research integrated ampliphier schematics
  97. FET CCS anode load and RFI/oscillation.
  98. Old schematic
  99. Newbie Looking for Replacement OPTS Motorola Console Amp
  100. Merlyn- May AudioXpress
  101. How to clean tubes?
  102. does the 3A5 have the stones to drive a 2A3?
  103. New amp: 13DE7 SE hybrid
  104. My amp is motorboating, improve it with b+ regulator ?
  105. Can you identify these amps?
  106. Sowter SA01 - anyone used it ?
  107. Mikael‑Abdellah‑SE‑KT88 Bias & Voltage readings Help?
  108. Resistors and combinations
  109. thr light in pcl82
  110. Bogen L330 - Worth restoring?
  111. Supro model 24 amp transformers
  112. Those Magnificent Television Tubes
  113. Demagnetizing OPT?
  114. Real DIY fun hybrid testing.
  115. Extreme hum in EQ output
  116. 46 triode-strapped DHT spice model
  117. SET output impedance vs speaker impedance
  118. Help with layout of tube preamp
  119. eico HF-65
  120. Wirewound bias pot problem.
  121. Driver for Telefunken RS242 in class A2
  122. Help on my signal generator
  123. another tube fact or fallacy
  124. Gap in Transformer Lams - OCD Check
  125. how to test...
  126. chinese tube amp
  127. tube/valve pc-80
  128. GM-70 All done
  129. Peavey 60/60 classic series schematic
  130. preamp for reciever?
  131. Designing a Tube Rectifier Circuit
  132. Bogen RP40A transformers....what to build with them?
  133. Harmony guitar amp restoration questions
  134. Heads Up for "El Cheapo" Builders
  135. replacing kt66 valves
  136. Help with power transformer identification
  137. 6-8x el84 Per channel
  138. To vary a signal pentode to triode in stages
  139. I have 2 choices for resistive load, need opinions.
  140. Tesla PCC88 7DJ8 dual triode - Help Needed.
  141. PP6550
  142. LT1083 interesting startup problem
  143. ECC33 Driver Stage
  144. Hiraga's Improved Concertina Phase Splitter
  145. 274B a direct replacement for 5AR4/GZ34?
  146. Help power up akai M8 amps
  147. Sonic Frontiers Power 3 Help!
  148. ImPasse Preamp now online
  149. Power supply for tube preamplifier with PCC88
  150. Don't know where to start...
  151. DIY noob
  152. 300B amp cathode bypass
  153. Amp hum with Preamp off
  154. First Project with these tubes
  155. 7189a socket rewiring
  156. Hybrid rectifiers in PSUD2
  157. Feedback / experience wanted on building the Audio note L4 Integrated EL34 PP Amp Kit
  158. About 6AS7BTL Amp
  159. Output Stage Protection Circuit
  160. Silly basic layout question - AC heaters
  161. heater voltage variation for special tubes
  162. Want to build a 807 Vixen.. Looking for help.
  163. Connecting Speakers to Yaqin 10L
  164. Gyrator Filter
  165. 6ab4 tube socket mounting
  166. Any Moto heads? Need OT advice please
  167. Did I break my tube? (new blue glow)
  168. I need help with ccs based LTP
  169. 4033L- rare triode tube.
  170. Single tube linestage schematic wanted: 8CG7
  171. Tetra Sans PS
  172. Tone controls
  173. Vintage Heathkit Electronic Switch as soundcard interface
  174. K-12M extra caps??
  175. Looking for Tube Amp Kit Recommendations
  176. magnatone 280 schematic
  177. high voltage after cap. change
  178. My first tube amp
  179. Recommendations for 6888 triode operating point?
  180. Mullard 12AX7 part uniformity
  181. 6n15n-EB confusion
  182. Noob Question: Phono Preamp
  183. Transformer data required P782
  184. Snubbers on Power Transformer Secondaries
  185. CCS for 6V6 PP amp
  186. screen voltage for triode strapped pentode
  187. New Driver
  188. purpose and value importance of resistor
  189. Values for Vintage Amp's & Preamp's Paragon 12(70's) & More
  190. Help with amp please.
  191. Another Discrete Current Source
  192. 834 Triode amp
  193. Determing the reason for mystery? cap in schematic.
  194. Dyna ST70 to Dual-differential EL34 triode amp project
  195. Tube Signal to Noise Ratio / Dynamic Range
  196. fluctating bias
  197. Just tried a Wire Wound pot for volume.
  198. LED's in the cathode..
  199. Dr. Arthur Loesch
  200. Counterpoint SA-220 mods
  201. Broskie P-P Bridged Output Stage
  202. Would a member fluent in technical German please have a look at this link?
  203. Damaged tube? EL84
  204. Heathkit AA-161 EL84/6BQ5 PP mono integrated amp mod
  205. vk-2100 mod question please
  206. Heater supply
  207. 6111/6n16b - linestage noise problem
  208. OPT specs
  209. Re: Tube Line gain stage with pcc88 or ecc82
  210. Knight-kit KA-55
  211. Can I delay part of a B supply this way?
  212. Tube Preamp turn on circuit
  213. SE GM-70 for 700-800 euro?
  214. filter cap markings
  215. tube buffer noise cancellation
  216. PSUD 2
  217. Bypassing filter caps with Smaller caps
  218. balancing resister for series capacitor in a power supply
  219. Yaqin MC-100b- TJ Full Music 6sn7
  220. Forgive me for I have sinned. Help with Volume Pot!
  221. Help with diagnoses for leak 20 PLEASE
  222. Suggested Circuit Changes to use EM80 in place of 6E2 Eye
  223. Fred Nachbaur SET amp: input capacitor
  224. Heathkit scu 1 and knight kn924 needed schematics
  225. Journey to the centre of a tube..
  226. RIP Dr Jim Marshall
  227. some questions about an ECL82 SE amp
  228. Heathkit Sine/Square wave Generator Manual needed!
  229. SRPP Signal Output Capacitors
  230. simple se input impedance
  231. Kt120 screen current
  232. New or used output xformers to play around with?
  233. Magnavox amp
  234. Help hooking up panel ammeter for bias adjust
  235. opt A-440
  236. OTL Headphone amplifier with Tube ED8000
  237. NJ7P Gone?
  238. MYSTERY METAL TUBES B-1532
  239. noisy tubes
  240. Old amp hum repair
  241. Traveling with DIY Kit in USA-Airport Security Question
  242. Hammond 1650P vs 1650N For EL34 PP
  243. Calibrate a Hickok 6000?
  244. Blown Output Tubes
  245. Kriesler Radiogram refurbishment questions
  246. 6P15P socket connection
  247. Revision 2. Balanced
  248. 6V6 schematic
  249. 6h23N test setting?
  250. 12AH7GT

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