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  1. Aikido 9 pin All in One Build
  2. KT88 PP UL Design Help Needed
  3. Cayin A-300B schematic needed
  4. Please Recommend a Preamp!
  5. Which Antek transforms to use
  6. Integrated Amp as Preamp and Subwoofer amp
  7. Uses for 715C Pulse Tetrode
  8. PP KT-88 w/866A MV HT Supply
  9. EC88 (6DL4) NOS Mullard - any use at all?
  10. Advice sought on thermionic headphone amp
  11. Eico HF-81: Input Selector bypass
  12. 12b4 bass rolloff problem
  13. No Right ch sound on yaqin mc10l
  14. tester causing bias to rise?
  15. Heaters & Filaments: AC vs. DC
  16. Old HP power transformers... need some wiring advice!
  17. Old HP power transformers... need some wiring advice!
  18. RCA RS177H just dosen't sound right! Caps?
  19. silicon or tube rectifier in an EL34 SE
  20. Help original 300G LEGACY
  21. 813 Tube-Steak!
  22. Basic 12AU7 heatrr question
  23. Shipping a vacuum tube to China
  24. 6DJ8/ECC88-SRPP Tube Preamplifier
  25. Help needed: hum noise in Eimac 250TL driven by 75TL Single End Amplifier
  26. Found tons of Tubes,and many other parts
  27. Ampeg B15 Heritage Clone Help
  28. EZ80 Data Sheets, R-Lim and Max Cap
  29. Filament Voltages CT vs Non-CT
  30. Troubleshooting help needed
  31. What is it? Tube guessology
  32. Bass & Treble controls, or rather lack of.
  33. Quicksilver 8417 Power Supply Question
  34. Why a sudden distortion in treble of this SET amplifier?
  35. 5f1 Champ grounding
  36. Antitriode PP with EL34
  37. How to calculate Pout for Push Pull design
  38. Newbie Question - Power Transformer vs Isolation Transformer
  39. All tubes red plating
  40. Exceeding bias voltage?
  41. Vacuum State RTP Preamp Problem
  42. Alfred Morgan Tube Preamplifier
  43. 845 vs GM70
  44. Looking for project suggestions - 12au7 pre-amp?
  45. Contemporary tradition breaking amp schematics.
  46. ul - triode coupled screen grid resistor
  47. Optimum driver valve for an interstage-transformer-driven SE 300B
  48. 6C33C
  49. Soundcraftsmen 5050
  50. Tetra Phono Question
  51. WF tube
  52. Opt laminations isolation
  53. Heretical Source
  54. Broskie auto bias
  55. heater wiring - the Good the Bad and the Ugly
  56. AC Line Filter
  57. Counterpoint SA5000 Help
  58. Problem with ECC83 measurement values - please help
  59. Newbie Bias help ?
  60. AV305m AVVT
  61. Pot mechanical resistance and restoration..
  62. HMV Little Nipper mantle radio = 1 STEREO
  63. What's the simplest way to adjust filament voltage?
  64. GDAP-06
  65. Audio Note L6 - Schematic?
  66. Preventing HV flashover on socket pins
  67. Best "Vintage" Stereo Pres that SoftClip and lotsa Harmonics
  68. SE with PP OPT's?
  69. 12ax7/12AT7 Recommendations
  70. HELP: Eimac 75TL amp high frequency roll off
  71. unison reserch s8, let's build it!
  72. Where do super high end companies get their transformers?
  73. Tube Tester Panel Meter
  74. Attic find AMP
  75. Help getting Imax and Eb approximations for a push-pull amp
  76. Is this amp OK to buy, or is this a problem?
  77. Swirling Harmonics, can it be described
  78. Line stage with u-follower and nfb
  79. Newbie looking for help, pre-out to tube amp.
  80. Unison research integrated ampliphier schematics
  81. FET CCS anode load and RFI/oscillation.
  82. Old schematic
  83. Newbie Looking for Replacement OPTS Motorola Console Amp
  84. Merlyn- May AudioXpress
  85. How to clean tubes?
  86. does the 3A5 have the stones to drive a 2A3?
  87. New amp: 13DE7 SE hybrid
  88. My amp is motorboating, improve it with b+ regulator ?
  89. Can you identify these amps?
  90. Sowter SA01 - anyone used it ?
  91. Mikael‑Abdellah‑SE‑KT88 Bias & Voltage readings Help?
  92. Resistors and combinations
  93. thr light in pcl82
  94. Bogen L330 - Worth restoring?
  95. Supro model 24 amp transformers
  96. Those Magnificent Television Tubes
  97. Demagnetizing OPT?
  98. Real DIY fun hybrid testing.
  99. Extreme hum in EQ output
  100. 46 triode-strapped DHT spice model
  101. SET output impedance vs speaker impedance
  102. Help with layout of tube preamp
  103. eico HF-65
  104. Wirewound bias pot problem.
  105. Driver for Telefunken RS242 in class A2
  106. Help on my signal generator
  107. another tube fact or fallacy
  108. Gap in Transformer Lams - OCD Check
  109. how to test...
  110. chinese tube amp
  111. tube/valve pc-80
  112. GM-70 All done
  113. Peavey 60/60 classic series schematic
  114. preamp for reciever?
  115. Designing a Tube Rectifier Circuit
  116. Bogen RP40A transformers....what to build with them?
  117. Harmony guitar amp restoration questions
  118. Heads Up for "El Cheapo" Builders
  119. replacing kt66 valves
  120. Help with power transformer identification
  121. 6-8x el84 Per channel
  122. To vary a signal pentode to triode in stages
  123. I have 2 choices for resistive load, need opinions.
  124. Tesla PCC88 7DJ8 dual triode - Help Needed.
  125. PP6550
  126. LT1083 interesting startup problem
  127. ECC33 Driver Stage
  128. Hiraga's Improved Concertina Phase Splitter
  129. 274B a direct replacement for 5AR4/GZ34?
  130. Help power up akai M8 amps
  131. Sonic Frontiers Power 3 Help!
  132. ImPasse Preamp now online
  133. Power supply for tube preamplifier with PCC88
  134. Don't know where to start...
  135. DIY noob
  136. 300B amp cathode bypass
  137. Amp hum with Preamp off
  138. First Project with these tubes
  139. 7189a socket rewiring
  140. Hybrid rectifiers in PSUD2
  141. Feedback / experience wanted on building the Audio note L4 Integrated EL34 PP Amp Kit
  142. About 6AS7BTL Amp
  143. Output Stage Protection Circuit
  144. Silly basic layout question - AC heaters
  145. heater voltage variation for special tubes
  146. Want to build a 807 Vixen.. Looking for help.
  147. Connecting Speakers to Yaqin 10L
  148. Gyrator Filter
  149. 6ab4 tube socket mounting
  150. Any Moto heads? Need OT advice please
  151. Did I break my tube? (new blue glow)
  152. I need help with ccs based LTP
  153. 4033L- rare triode tube.
  154. Single tube linestage schematic wanted: 8CG7
  155. Tetra Sans PS
  156. Tone controls
  157. Vintage Heathkit Electronic Switch as soundcard interface
  158. K-12M extra caps??
  159. Looking for Tube Amp Kit Recommendations
  160. magnatone 280 schematic
  161. high voltage after cap. change
  162. My first tube amp
  163. Recommendations for 6888 triode operating point?
  164. Mullard 12AX7 part uniformity
  165. 6n15n-EB confusion
  166. Noob Question: Phono Preamp
  167. Transformer data required P782
  168. Snubbers on Power Transformer Secondaries
  169. CCS for 6V6 PP amp
  170. screen voltage for triode strapped pentode
  171. New Driver
  172. purpose and value importance of resistor
  173. Values for Vintage Amp's & Preamp's Paragon 12(70's) & More
  174. Help with amp please.
  175. Another Discrete Current Source
  176. 834 Triode amp
  177. Determing the reason for mystery? cap in schematic.
  178. Dyna ST70 to Dual-differential EL34 triode amp project
  179. Tube Signal to Noise Ratio / Dynamic Range
  180. fluctating bias
  181. Just tried a Wire Wound pot for volume.
  182. LED's in the cathode..
  183. Dr. Arthur Loesch
  184. Counterpoint SA-220 mods
  185. Broskie P-P Bridged Output Stage
  186. Would a member fluent in technical German please have a look at this link?
  187. Damaged tube? EL84
  188. Heathkit AA-161 EL84/6BQ5 PP mono integrated amp mod
  189. vk-2100 mod question please
  190. Heater supply
  191. 6111/6n16b - linestage noise problem
  192. OPT specs
  193. Re: Tube Line gain stage with pcc88 or ecc82
  194. Knight-kit KA-55
  195. Can I delay part of a B supply this way?
  196. Tube Preamp turn on circuit
  197. SE GM-70 for 700-800 euro?
  198. filter cap markings
  199. tube buffer noise cancellation
  200. PSUD 2
  201. Bypassing filter caps with Smaller caps
  202. balancing resister for series capacitor in a power supply
  203. Yaqin MC-100b- TJ Full Music 6sn7
  204. Forgive me for I have sinned. Help with Volume Pot!
  205. Help with diagnoses for leak 20 PLEASE
  206. Suggested Circuit Changes to use EM80 in place of 6E2 Eye
  207. Fred Nachbaur SET amp: input capacitor
  208. Heathkit scu 1 and knight kn924 needed schematics
  209. Journey to the centre of a tube..
  210. RIP Dr Jim Marshall
  211. some questions about an ECL82 SE amp
  212. Heathkit Sine/Square wave Generator Manual needed!
  213. SRPP Signal Output Capacitors
  214. simple se input impedance
  215. Kt120 screen current
  216. New or used output xformers to play around with?
  217. Magnavox amp
  218. Help hooking up panel ammeter for bias adjust
  219. opt A-440
  220. OTL Headphone amplifier with Tube ED8000
  221. NJ7P Gone?
  222. MYSTERY METAL TUBES B-1532
  223. noisy tubes
  224. Old amp hum repair
  225. Traveling with DIY Kit in USA-Airport Security Question
  226. Hammond 1650P vs 1650N For EL34 PP
  227. Calibrate a Hickok 6000?
  228. Blown Output Tubes
  229. Kriesler Radiogram refurbishment questions
  230. 6P15P socket connection
  231. Revision 2. Balanced
  232. 6V6 schematic
  233. 6h23N test setting?
  234. 12AH7GT
  235. TUBE Tape Head record / playback amp....
  236. Strange couple comportament 6L6GC RCA black plates.
  237. Reduce Output Volume
  238. Differential Amp CCS Tail SVCS Plate - Noise Issues
  239. Triode curves for EL/PL519
  240. Is that a SRPP circuit with 6SN7?
  241. KT33 Push Pull
  242. Rogers Cadet III Integrated Amp Capacitor Values help
  243. 2a3 alternative after NOS burning
  244. 6SN7 SRPP - oscillating dc offset
  245. Hickok TV-2 'percent quality'
  246. Another Tube I/V converter/preamp for balanced DACs with SE output:build thread
  247. Aikido LV 48V ECC99 or 6N6p
  248. Project: Ultra Small 6C33 / Hybrid Stereo Headphone Amplifier
  249. Back to the tubes
  250. Any use for these PAECO transformer?

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