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  1. 4P1L worth stocking up?
  2. Help Identifying A Valve Amplifier
  3. Sonic Frontiers Power 3 Help Needed
  4. Re-build of my first OTL from 2000
  5. Help with choosing substitute output transformer??
  6. Last stop before the end of the road !
  7. Output Transformer insertion/power losses
  8. OTL, not OTL, & Matching VS Loading transformers
  9. Out with the MJ in with the Aikido
  10. What can I use parts for?
  11. Can someone help me understand this topology?
  12. Looking for PP design when I already have the OPTs
  13. New project, Damn Good 300B amp.
  14. medium power (~20W) amplifier and power supply requirements
  15. ID this Dynaco ST-70 board
  16. SRPP with different brand of tubes ?
  17. Best tube amp clone for stereo music
  18. RCA receivers / amps
  19. Triode PP design questions - where to add gain?
  20. Push Pull Tube Amplifier with CCS
  21. McIntosh MC275 problem.
  22. converting pentode data to triode-strapped? The 1609 pentode?
  23. Moscode 300 Manual/schematic
  24. Need help with new amp design
  25. 4699 SEP (unusual cathode feedback?)
  26. DH filament side matters?
  27. FU50 + 6N8P + 5Z3P Amplifier
  28. Collet wire connector for 300B socket?
  29. KT-88, KT-77, Russian 6SN7 makes "pops". Should I touch their pin with an iron?
  30. Tube Power Supply Question
  31. Would there be any harm using 10K OPT for 45 tubes?
  32. Restoring the first Pye HF25
  33. Jolida FX10 mods
  34. Help needed - DIY amp not working; first time powering up
  35. EL86: push-pull for home
  36. Input transformer question? Help identifying
  37. Anyone ever tried building the Feral Eye 2A3 PP?
  38. Schade Feedback In A Push Pull Differential Amplifier?
  39. PSA: new diy tubes sub on Reddit
  40. Hum/Buzz in a tube PP amp
  41. 300B+6GL7 SE stereo integrated amplifier
  42. Bias tap on b+ or separate winding?
  43. Arcturus No. 12 tube
  44. SainSmart 6N3 pre for Pass ACA
  45. Single ended MM tube phono amp
  46. 5U4G schematic for 4x6SN7 Stereo Octal Akido Preamp.
  47. ECL82 amp from old magnetophones
  48. Bogen MO100A with KT120 ??
  49. Someone sales out trafos Jensen transformers in europe?
  50. Book recommendation?
  51. Sanity check? HV supply for 125wpc sweep tube amp
  52. 6922 Technical info (help)
  53. How about this phono idea
  54. Scottkit trouble
  55. How to remove tube metalization
  56. Old Dynatron Information
  57. good driver tube with 150mA heater?
  58. Tell me what this is
  59. Switch between tubes with relay
  60. Need some help with my Palmer Eins
  61. A rare tube in my hands. Info please.
  62. Dealing with Heater Elevation/Ground Reference for aux circuit
  63. 6GK5 OR 6AH5 for phono head amp
  64. Parallel triodes: best connection?
  65. Which resistors to replace burned ones in Dared DV-300b monoblocks
  66. Unusual tube preamp, will it work?
  67. Eico HF-81 with Pre Out?
  68. volume control by pass power tube
  69. Single End Transfomers, The hysteresis loop and maximum current
  70. DC at output on startup
  71. Yet another ECC82/12AU7 Line Preamp
  72. Clarke and Smith EL84 Amp
  73. Are rectifier tubes still relevant? Why would you use one, or avoid using one?
  74. replace 5R4GA to WE 274B
  75. 6sl7 vs 6n9p vs 6n9s
  76. MAC bifilar output stage test proof
  77. Dummy load for bench testing tube pre.
  78. Brook 12A Mono blocks
  79. Maximum Ic before auto shutdown
  80. Octal Akido HP amp as pre amp
  81. loudspeaker series resistance question
  82. Which preamp a better match for low-volume listening?
  83. Balanced Signal, Phase Splitter in Push Pull topology
  84. Pin 4 Grid 2 Resistor
  85. Weird voltage w/ LM1084 regulators / #27 filaments
  86. My Audio Research SP-3-A1 Restoration and Questions Documentation
  87. Almarro a318B
  88. Bakelite and Car Brakefluid
  89. Chinese 6N2 / 6P1 schematics advice needed
  90. Operating point of GM70
  91. 50W 6L6 (6P7S) how to replace tube ccs for solid state?
  92. Star Grounding for a Line Stage Tube Preamp
  93. ID Kit Amp Help. K-12 Tube Amp or Similar?
  94. Are they still making Golden Dragon?
  95. About LL1660/18mA
  96. ST-120 tube set
  97. Newb seeks to drive DVC 4+4 ohm 500w RMS subwoofer with tubes.
  98. The 33 Amplifier
  99. Build Your Own Vacuum Tubes
  100. Can Anyone Tell Me What This Pot Does in AN Soro?
  101. Which high-voltage MOSFET for source follower?
  102. A Practical Circlotron You Can Build
  103. Noob questions
  104. JohnBlue TL66 Monoblocks hum problem. Help please
  105. ECL82 SE 1,8W
  106. RH slayer
  107. Cary SLP-90 preamp power supply
  108. phase splitter with low distortion
  109. First PSU Capacitor
  110. Chinese tubes
  111. SE class A2
  112. Dynaco MKIV 7199 driver circuit
  113. Someone out there....type of tube ?
  114. admiral 5t4a
  115. Pentode Screen Resistance (rs) Estimation Example
  116. Grounding linstage help
  117. What is this tube?
  118. Do 300b tube have a "guide pin"
  119. Effect of Weak Mains Power
  120. Croatian Triode Festival Zadar-2016
  121. Using dht self bias resistor to lift idht front end heater
  122. Philips EL6411/01 amplifier
  123. Quad II output transformer
  124. Mosfet or other semiconductor substitute for cathodyne?
  125. 6SN7 preamp tube alternative with less gain?
  126. Hagerman Cornet Octal planning help and build
  127. output transformer opposing windings/ please explain
  128. Preamp Transformer overheats
  129. Finishing ASC capacitors
  130. Can't identify this tube?
  131. 6SN7 pin 4 signal input
  132. Help - Tube PSU Design
  133. Little help for a newbie?
  134. Has anyone built this phono stage you can buy on ebay as a circuit board.
  135. pl504 Vacuum tube
  136. Tubes in the Unballancer
  137. Quad II Amplifier KT66 Valves/Tubes and Carbon Composition Resistors
  138. ecc88 preamp
  139. Tube socket center post
  140. Troubleshooting bias of old diy amp with Acrosound TO-300 transformer
  141. Dynaco Mark III with noisy transformer, making hum.
  142. Power amplifier EL 34
  143. Replace 6SN7 to E88CC on HP amp 90VDC plate capable?
  144. 1p24b Russian tube
  145. Tube power supply
  146. Tube-O-Philes, Please help with this chassis search
  147. WOW, I want one !!!
  148. B&K dyna-quick 550
  149. What is this? Valve Amp?
  150. CCS instead of a resistor in the cathode of a cathode follower?
  151. Please comment on D3a tube testing
  152. ID tube amp kit 8 watts stereo.. unsure what tubes to use
  153. Mixed bias for 6336a or 6AS7 output tubes?
  154. Vintage Tube Amp kit - Can it be refurbished?
  155. Any experience or opinion about 300B/EL34 Chinese DIY Kit ...
  156. Measuring "high impedance voltage" with digital multimeter
  157. SE (UL ?) HI FI project needs help
  158. Can anyone verify this math? MC 2205 Watt Scale
  159. Generic design question for Pentode CCS
  160. Using big power tubes as buffer?
  161. Reason for tube converter
  162. Valve Mosfet Hybrids: a solution
  163. Protecting Plitron OPT
  164. DHT line stage 26, 01a or 101d
  165. Tube manufacturers
  166. Pinnacle Datasheets
  167. Tube preamp
  168. Can I use 1.1 instead of .47
  169. Project: Add a DAC to Pete Millett's low voltage hybrid tube amp
  170. Speakers for S5 K-16LS Kit
  171. Inexpensive B+ Batteries
  172. Leak Stereo 20 Capacitor Replacement Question
  173. Dynaco Mark IV exploding bias filter capacitor
  174. Anyone familiar with the Raphaelite sinovt 2a3-845
  175. Building monoblocks, go Dynaco MKIII or.....?
  176. Priboi (Surf :d) output transformer possible problem
  177. replacing ECC83 with ECC82 in stereo amp
  178. Counterpoint SA-5000 FET Buffer
  179. C3M 300B SET build, input appreciated.
  180. K12G Quiet Channel
  181. Weird "holes" in getter
  182. Radiotron A530 6J7G-6V6G-2A3 PP Amp
  183. Tube Identification
  184. Can i sub a 50K for a 100K volume control?
  185. Are the 12B4 and 12b4A interchangable?
  186. SE or PSE amplifier with 6N6P driving the 300B tube
  187. About 300B SE heater w/t Coleman regulator
  188. Should my TVC x formers be input or output
  189. Preamp Chassis Layout Advice
  190. Russian Audio Tubes
  191. SE UL EL 300 / ECC 83
  192. Grid Chokes
  193. Pot for project test
  194. Interpreting "Horizontal Osc. Service"
  195. My Take on a DIY Valve tester
  196. 6Н6П vs 6Н6П-И (gold grid etc claims ? )
  197. GU 19 VS GU 19-1 What's the difference ?
  198. please advice 1K Vdc power supply
  199. Has anyone used an opamp to split phase for a tube amp?
  200. Advice for budget valve amplifier
  201. S-5 Electronoics K-12M amplifier: lack of plate to grid coupling caps
  202. Eico ST70 needs a preamp output....
  203. Damper diode slow start
  204. KT150 SE based on Mikael's KT88 Schematic
  205. Octal driver tube choice
  206. Anyone ever clone a Audionote P1 SE
  207. Bogen DB212 phase-inverter
  208. EAR 869
  209. # triode 31 line pre amp
  210. Choosing The Iron For A SE OPT?
  211. Swap EL34 with 6L6 or 6V6
  212. Bridgeable floating output transformer help
  213. tapedeck playback amplifier
  214. Design based on the Output Transformer
  215. UL Push-Pull Tube Amp (mono combo)
  216. Power transformer for SET: toroid vs EI core
  217. Tektronix 547 Oscilloscope reserection
  218. can I use 12v to run 6C33C tubes???
  219. How to understand the data sheet for this 'universal' SE output transformer?
  220. DIY Stereo Amp
  221. el84 and 6aw8a
  222. Tube amp reboot Re: Chinese 6P6P (6V6) Push-Pull Tube Amplifier Kit
  223. 2A3 driver
  224. Tube Phono Preamps
  225. Newbie. Balanced 2A3 SE amplifier information
  226. Tube rectifier supply help
  227. cathode follower - please check my circuit
  228. Output tube stage 1578 for no DAC
  229. Bias for 300B
  230. Pots value in tube equalizer
  231. 'Real world' max plate voltages for 6DJ8, 6P15P?
  232. Lower load resistance for lower distortion (6L6 PP)
  233. Transformer Hum.
  234. Hmmmm Star ground
  235. Updating a HeathKit IT-11 capacitor checker
  236. Taylor T20 triode - anyone used these?
  237. Filament DC power supply for 2 valves
  238. Tubes availability
  239. Tube power amp bad fit for ML?
  240. SLA Battery (Filament Supply) DC Reference limits?
  241. Citation I, Citation II, and another Citation I
  242. tube amp damping / weird bass response, speaker movement
  243. Convert valve output stage to pre amp
  244. 6HJ5 SET
  245. A different type of EL84 SE
  246. Transformer covers; steel or aly?
  247. Triplett 3444A tube chart
  248. polyester or polypropylene or other??
  249. Opinions on SET transformers for 307a amp
  250. Strange experience with Dynaco ST70 input tubes

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