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  1. Add Standby Directly after Rectifier, or After First Filter Stage?
  2. Help with some tube ID
  3. CCS power amp bias
  4. this is EL34 tube of what model?
  5. Looking for constructive criticism on my first design
  6. Audio note kit 1 vs Meishu
  7. Tube Amp Gain V.S. RF Gain
  8. Kool-mu material for building audio transformer
  9. Buzz/Hum in Matrix amplifier
  10. Optimation PA-250AC Lab-Grade Audio Amplifier
  11. RS1003 in SE triode-UL monoblocks
  12. Bypass capacitors in Tube amps
  13. Basic question re: gNFB around 3 stages
  14. James PP Audio Transformers, any good?
  15. Seeking advice for tube amp kit on,seems to be, chinese site
  16. Tube pricing from 1981
  17. 6e5p WCF headphone amp with no cap!
  18. "How it's made" vacuum tubes..
  19. Citation I and IV phono schematic query
  20. GS-4V High-mu russian triode for RIAA preamp
  21. good source for amp chassis in europe?
  22. Help identify and replacement of ? resistor
  23. New tube amp diy kit required power?
  24. Decoupling DC heater supply between valves..benefit?
  25. The Aikido Comedy: Straight Talk
  26. Recapping tube preamp questions
  27. A tube amp that's actually a tesla coil.
  28. Tube "Orientation"
  29. 18 watt tremolo vvr
  30. Pre amp output, would this work?
  31. Aikido Power Amp.....Possible??
  32. 12AX7 questions
  33. 6550 PUSH-PULL
  34. CCS at plate? Unknown schematic part
  35. Most odd grid choke behaviour.
  36. Spec for Altec TP-404 Transformer
  37. why do wimpy drivers for 2A3 work as well as they do?
  38. Seeking advice on Tube buffer / pre-amp
  39. 8x Push-pull KT88 class A in triode mode
  40. Tube Pre dull into Tube Amp - cause ?
  41. FINALLY I can start building my GM70
  42. Russian triodes ГИ-15Б arriving in a few days
  43. Cap or resistor
  44. KT88/PP driver confusion
  45. Simple SE GU-50
  46. Darling 1626
  47. 01a DHT Preamp
  48. Suitable tubes for Gomes output
  49. phono line stage project
  50. Whats wrong with this circuit?
  51. Any Newcomb Gurus.?
  52. Preamp Tube MU Level?
  53. SRPP Paraccordion topology ?
  54. Replacing 6922 with 6FQ7 in Conrad Johnson ET3 preamp
  55. Modification of a Chinese KT90 PP amplifier
  56. Tricky Headphone Amp design for AK4396
  57. How to know voltage bias adjustmentwith this data?
  58. Strange Stability Enhancement Trick
  59. has anyone bought tubes from http://www.tangotubes.com/
  60. “Earmax / G3 / Morgan Jones / Cavalli” Headphone Amp Reissue with 6SN7 Steroids
  61. Ever heard of British transofmer company "Ro"?
  62. A friend gave me some random tubes...
  63. Replacement for 6e2 without vu
  64. PP GU50 triode strapped project
  65. Tube VAS stage questions???
  66. OT impedance help: 9.8 vs 8k
  67. popping & crackling noise from restored valve AM radio
  68. Choosing 6550 PP Output Transformer
  69. Reversing Interstage Transformer
  70. Aikido 9 pin All in One Build
  71. KT88 PP UL Design Help Needed
  72. Cayin A-300B schematic needed
  73. Please Recommend a Preamp!
  74. Which Antek transforms to use
  75. Integrated Amp as Preamp and Subwoofer amp
  76. Uses for 715C Pulse Tetrode
  77. PP KT-88 w/866A MV HT Supply
  78. EC88 (6DL4) NOS Mullard - any use at all?
  79. Advice sought on thermionic headphone amp
  80. Eico HF-81: Input Selector bypass
  81. 12b4 bass rolloff problem
  82. No Right ch sound on yaqin mc10l
  83. tester causing bias to rise?
  84. Heaters & Filaments: AC vs. DC
  85. Old HP power transformers... need some wiring advice!
  86. Old HP power transformers... need some wiring advice!
  87. RCA RS177H just dosen't sound right! Caps?
  88. silicon or tube rectifier in an EL34 SE
  89. Help original 300G LEGACY
  90. 813 Tube-Steak!
  91. Basic 12AU7 heatrr question
  92. Shipping a vacuum tube to China
  93. 6DJ8/ECC88-SRPP Tube Preamplifier
  94. Help needed: hum noise in Eimac 250TL driven by 75TL Single End Amplifier
  95. Found tons of Tubes,and many other parts
  96. Ampeg B15 Heritage Clone Help
  97. EZ80 Data Sheets, R-Lim and Max Cap
  98. Filament Voltages CT vs Non-CT
  99. Troubleshooting help needed
  100. What is it? Tube guessology
  101. Bass & Treble controls, or rather lack of.
  102. Quicksilver 8417 Power Supply Question
  103. Why a sudden distortion in treble of this SET amplifier?
  104. 5f1 Champ grounding
  105. Antitriode PP with EL34
  106. How to calculate Pout for Push Pull design
  107. Newbie Question - Power Transformer vs Isolation Transformer
  108. All tubes red plating
  109. Exceeding bias voltage?
  110. Vacuum State RTP Preamp Problem
  111. Alfred Morgan Tube Preamplifier
  112. 845 vs GM70
  113. Looking for project suggestions - 12au7 pre-amp?
  114. Contemporary tradition breaking amp schematics.
  115. ul - triode coupled screen grid resistor
  116. Optimum driver valve for an interstage-transformer-driven SE 300B
  117. 6C33C
  118. Soundcraftsmen 5050
  119. Tetra Phono Question
  120. WF tube
  121. Opt laminations isolation
  122. Heretical Source
  123. Broskie auto bias
  124. heater wiring - the Good the Bad and the Ugly
  125. AC Line Filter
  126. Counterpoint SA5000 Help
  127. Problem with ECC83 measurement values - please help
  128. Newbie Bias help ?
  129. AV305m AVVT
  130. Pot mechanical resistance and restoration..
  131. HMV Little Nipper mantle radio = 1 STEREO
  132. What's the simplest way to adjust filament voltage?
  133. GDAP-06
  134. Audio Note L6 - Schematic?
  135. Preventing HV flashover on socket pins
  136. Best "Vintage" Stereo Pres that SoftClip and lotsa Harmonics
  137. SE with PP OPT's?
  138. 12ax7/12AT7 Recommendations
  139. HELP: Eimac 75TL amp high frequency roll off
  140. unison reserch s8, let's build it!
  141. Where do super high end companies get their transformers?
  142. Tube Tester Panel Meter
  143. Attic find AMP
  144. Help getting Imax and Eb approximations for a push-pull amp
  145. Is this amp OK to buy, or is this a problem?
  146. Swirling Harmonics, can it be described
  147. Line stage with u-follower and nfb
  148. Newbie looking for help, pre-out to tube amp.
  149. Unison research integrated ampliphier schematics
  150. FET CCS anode load and RFI/oscillation.
  151. Old schematic
  152. Newbie Looking for Replacement OPTS Motorola Console Amp
  153. Merlyn- May AudioXpress
  154. How to clean tubes?
  155. does the 3A5 have the stones to drive a 2A3?
  156. New amp: 13DE7 SE hybrid
  157. My amp is motorboating, improve it with b+ regulator ?
  158. Can you identify these amps?
  159. Sowter SA01 - anyone used it ?
  160. Mikael‑Abdellah‑SE‑KT88 Bias & Voltage readings Help?
  161. Resistors and combinations
  162. thr light in pcl82
  163. Bogen L330 - Worth restoring?
  164. Supro model 24 amp transformers
  165. Those magnificient television tubes
  166. Demagnetizing OPT?
  167. Real DIY fun hybrid testing.
  168. Extreme hum in EQ output
  169. 46 triode-strapped DHT spice model
  170. SET output impedance vs speaker impedance
  171. Help with layout of tube preamp
  172. eico HF-65
  173. Wirewound bias pot problem.
  174. Driver for Telefunken RS242 in class A2
  175. Help on my signal generator
  176. another tube fact or fallacy
  177. Gap in Transformer Lams - OCD Check
  178. how to test...
  179. chinese tube amp
  180. tube/valve pc-80
  181. GM-70 All done
  182. Peavey 60/60 classic series schematic
  183. preamp for reciever?
  184. Designing a Tube Rectifier Circuit
  185. Bogen RP40A transformers....what to build with them?
  186. Harmony guitar amp restoration questions
  187. Heads Up for "El Cheapo" Builders
  188. replacing kt66 valves
  189. Help with power transformer identification
  190. 6-8x el84 Per channel
  191. To vary a signal pentode to triode in stages
  192. I have 2 choices for resistive load, need opinions.
  193. Tesla PCC88 7DJ8 dual triode - Help Needed.
  194. PP6550
  195. LT1083 interesting startup problem
  196. ECC33 Driver Stage
  197. Hiraga's Improved Concertina Phase Splitter
  198. 274B a direct replacement for 5AR4/GZ34?
  199. Help power up akai M8 amps
  200. Sonic Frontiers Power 3 Help!
  201. ImPasse Preamp now online
  202. Power supply for tube preamplifier with PCC88
  203. Don't know where to start...
  204. DIY noob
  205. 300B amp cathode bypass
  206. Amp hum with Preamp off
  207. First Project with these tubes
  208. 7189a socket rewiring
  209. Hybrid rectifiers in PSUD2
  210. Feedback / experience wanted on building the Audio note L4 Integrated EL34 PP Amp Kit
  211. About 6AS7BTL Amp
  212. Output Stage Protection Circuit
  213. Silly basic layout question - AC heaters
  214. heater voltage variation for special tubes
  215. Want to build a 807 Vixen.. Looking for help.
  216. Connecting Speakers to Yaqin 10L
  217. Gyrator Filter
  218. 6ab4 tube socket mounting
  219. Any Moto heads? Need OT advice please
  220. Did I break my tube? (new blue glow)
  221. I need help with ccs based LTP
  222. 4033L- rare triode tube.
  223. Single tube linestage schematic wanted: 8CG7
  224. Tetra Sans PS
  225. Tone controls
  226. Vintage Heathkit Electronic Switch as soundcard interface
  227. K-12M extra caps??
  228. Looking for Tube Amp Kit Recommendations
  229. magnatone 280 schematic
  230. high voltage after cap. change
  231. My first tube amp
  232. Recommendations for 6888 triode operating point?
  233. Mullard 12AX7 part uniformity
  234. 6n15n-EB confusion
  235. Noob Question: Phono Preamp
  236. Transformer data required P782
  237. Snubbers on Power Transformer Secondaries
  238. CCS for 6V6 PP amp
  239. screen voltage for triode strapped pentode
  240. New Driver
  241. purpose and value importance of resistor
  242. Values for Vintage Amp's & Preamp's Paragon 12(70's) & More
  243. Help with amp please.
  244. Another Discrete Current Source
  245. 834 Triode amp
  246. Determing the reason for mystery? cap in schematic.
  247. Dyna ST70 to Dual-differential EL34 triode amp project
  248. Tube Signal to Noise Ratio / Dynamic Range
  249. fluctating bias
  250. Just tried a Wire Wound pot for volume.

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