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  1. PP oscillation with toroid output transformer
  2. 6B4G New Amp Build Issue
  3. Mable Audio 300B Amp KitI
  4. Help me understand - 7061 vs. 12ab5 (and the rest of the 6V6 family)
  5. ebay seller jellyfishaudio
  6. DIY Tubelab SSE build keeps blowing fuses when turned on.
  7. 866a rectifier on 6.3vct@10A
  8. Vintage tube preamp design
  9. Output Transformer Wiring
  10. Ground loop problems
  11. Reversed preamp OPT as IPT
  12. A2 p-p with Millett driver
  13. DC filament supply schematic
  14. Mystery tube
  15. 6eu7/6bq5 feedback question
  16. Ultimate Ultralinear Amp...please help to understand...
  17. Mullard 20 Watt Amp
  18. Transformer feedback winding: Tamura HN-1
  19. the big one
  20. ECC33 vs 6SN7 - Implications I should know?
  21. What is a Source Measure unit (SMU)?
  22. Building a tube amp from scratch
  23. Priboj (priboi) 50, small problem (SOVIET TUBE AMP)
  24. Kellogg (Dukane?) Tube PA Amp
  25. APPJ PA1501
  26. New production 6L6GC tubes and similar
  27. Knight 10W 6V6 push-pull tube power amp
  28. 480vct at 50VA for less than $12 shipped
  29. Pioneer SA-81 integrated tube amp
  30. 12B4 Preamp Design/Pre-build Questions
  31. Can I mount a 5R4WGA at a 10 degree angle?
  32. plate current variation with fixed bias
  33. 5693 issue
  34. SPP amp build from TubeLab
  35. "mustard" Philips Mullard capacitors
  36. Hum SOLVED!!!!
  37. Garage System Control/Preamp idea
  38. Aikido Octal line stage kit info needed
  39. Phonola suitcase player...now, with hum!
  40. My latests (well ... first) RIAA preamp
  41. 12at7 one side drawers 10% more current
  42. Upgrade output transfomers, EL34 single-ended
  43. cleaning tubes / valves
  44. a simple (I think) Baxandall question
  45. Paoli Model 60M help
  46. Audio Noise Tube Tester
  47. Should something be done about these traces?
  48. 300(may)B(e) - Recs & Advice
  49. LNF in gain stage or CF?
  50. KT77 at 790 V
  51. Newb question about tube socket placement
  52. my first tube amp project
  53. Fun With Measurements
  54. Unusual Schematic help
  55. 12AX7 vs 12AT7 vs 12AU7
  56. 6SN7 Distortion Canceling in Amp
  57. D-115 w/ weak channel
  58. MOSFET Follower Choices
  59. Sanity check my unlabeled transformer guesstimates? Fisher X-200 power trafo
  60. Mystery Tube Time
  61. PSU simulation help
  62. Vacuum tubes and wire wrap
  63. LTP phase splitter as output stage?
  64. Swap 6B4G for 6SL7 SRPP ?
  65. Jean Hiraga or Tubelab SSE for KT88 SET
  66. Need Fuse Values for 6922 Tube Premp, 6.3v & B+ Fuse Value
  67. 12AX7 tone control with low B+ voltage
  68. Cathodefollower and strange behaviour with lowering of anode voltage.
  69. Early Audio Research Dual 100 Schematic?
  70. current drive
  71. Bench Supply
  72. 6X5 GT Hybrid rectifier
  73. 8417 tube test on Hickok 539a
  74. small shrouded PP OPT choices ?
  75. Single triode instead of double triode?
  76. Low noise valve tube circuit ideas for cassette deck
  77. Found a box of various 9 pin tubes....
  78. 12AU7 internally matched triodes
  79. Homemade tube socket adaptor
  80. Who's mark was on this obvious 6n23p?
  81. Thoughts on amp mods
  82. Just a quick thanks to you guys
  83. Low voltage tube line preamp
  84. What the difference between 6H7C & 6H8C tubes
  85. Headphone amp OTL
  86. Recommend design for low cost DIY valve amp
  87. need help with short
  88. Simple 1-device gyrators
  89. Need assist - Melos 110 Preamp
  90. Bad capacitor?
  91. Does someone has info about this tubes ?
  92. 2c26a
  93. Help identifying vintage tube amp connector
  94. What make is this E88CC ?
  95. Valve amp - vanishing bass
  96. 5Z3P 6N9P EL34B SE amplifier
  97. Wrapping my head around cathode followers. Does this explanation make sense?
  98. HK A500 rebuild
  99. LS7B Marantz 7 Clone PreAmp
  100. SS to drive 300b
  101. is the 12ax7 ever used on television sets?
  102. What topology was this old RCA power transformer designed for?
  103. BOM of Audio Research SP-11 MkII and D-115 MkII
  104. ECC88/6DJ8 at higher Va
  105. Valve headphone amp humming through headphones
  106. Merlin's new hi-fi valve preamp book is released
  107. Screen Drive 6BQ6GT Amp - Feasibility Study
  108. Harmon Kardon A50K project
  109. Reading high V through resistor/cap casings
  110. Troubleshooting magnavox 9302-00
  111. How Safe are Ceramic Top Caps?
  112. Vintage 1990's Audio Note 2k5 output transformer wiring color code
  113. Splitting the audio band into two transformers
  114. 21LG6/A P-P for 50+ watts?
  115. Anyone use an IEC line filter plug??
  116. pre Line 2 end Line 3
  117. NEW D3a equivalent on marked?
  118. Anyone tried Plitron transformers?
  119. Summing channels;Why? JE EL34
  120. TAJ's Harman Kardon Citation V rebuild thread
  121. Screened/shielded cables in chassis
  122. Cascode question re shunt to lower tube
  123. LED biasing in preamp - cap in parallel required?
  124. Can you identify these tube amplifiers? 4x807 & mercury vapor rectifiers
  125. Amperex BB ECC82 - Real or Fake?
  126. Max screen grid voltages in datasheets
  127. Tube rectifiers
  128. VT-25/10Y tubes
  129. Does anyone have the schematic for Transcendant Sound Mini Beast?
  130. Schematic help please
  131. Faulty rectifier valve possibly damaged my amplifier - help
  132. 6J1 tube buffer circuit diagram
  133. Filament transformer question
  134. Grundig 9060 output transformer identifying
  135. 6J1 biasing inconsistencies with datasheet
  136. Separate transformer for heaters. How to reference this to ground?
  137. 300B alternatives
  138. Stereo to Mono transformer based 'hybrid/bridging mixer'
  139. LK-48 over voltage
  140. Aikido all in one
  141. Bitsa Amp project
  142. Search for thread/article about phono preamp design
  143. Fusing valve amps
  144. AIKIDO line stage
  145. Cossor 61SPT - any experience?
  146. 6BG6GA PP, -bias, Amp built but couple problems
  147. GE 6sn7 made in Italy
  148. First SE Amp Build
  149. HV soft start
  150. Setup Question (do I really need the gain from a preamp)
  151. Your opinions please
  152. design advise
  153. Interpolation Oscillator
  154. audio note oto
  155. A small resonant HV converter: Q-Conv
  156. Iv got a 100w OPT That needs a circuit
  157. Powerful tube amp / unmatched tubes in parallel
  158. Need help: I have 807s and the guts from a HK AA-100
  159. SE EL34 and speakers
  160. 6AK10 LTP with CCS question
  161. Is a heater voltage of 6.7 cause for concern?
  162. Tube guards/cage for Elekit TU-8200
  163. ming da mc 845 aa modification
  164. How good can this headphone amp/pre amp be?
  165. Zero Bias Solution?
  166. Cathode Degeneration with CCS plate load- My Mistake
  167. Pilot 240 with too much bass-- circuit modification needed?
  168. EL34 DIY "centre-tapped" tube ??
  169. Advice for Super Cheap & Simple 829b based amp from spare parts
  170. Infineon IPA50R140CP N-channel mosfet
  171. Borberly Op amp 4 Tube Mosfet hybrid
  172. Splitting Power Supply Choke Question
  173. Toroidal PT as OPT in big power application?
  174. Inrush limiter question
  175. Counterpoint AS-5.1 Tube Type Question
  176. OPT connections
  177. Help teach a CS guy to test a tube amp!
  178. Now THIS is an output transformer
  179. Gas rectifier vs vacuum rectifier
  180. What value for the bias resistor of a SE 6550?
  181. ELL80 tube-Ultralinear mode???
  182. Russian "6L6" ID
  183. Tube amp for a car lol
  184. S5 Electronics Upgrade
  185. Best Tube for SPUD Amp
  186. Zenith 7b31 EL84 Tube Amp Low Volume
  187. Heater cathode elevation
  188. 6K5GT & EL36 AMP
  189. Grid stopper by ECC83
  190. 6L6 Without Screen Drive?
  191. Fusion Postmodernism and tube amps ---- 6SN7 + 26 45
  192. Mullard V.T.52 Push-Pull Tube AMP.
  193. Amp for Magneplaner 1,6/R
  194. Car tube amp- looking for advice
  195. Direct replacement for 5Z3PA and 5Z3P Rectifier
  196. 83 Rectifier
  197. Ground noise and hum: why and how to maybe fix it
  198. How to measure SNR?
  199. Triode vs Pentode cathode followers
  200. Damaged tubes
  201. 2W on 8Ohm OTL amplifier?
  202. EC88 dirver PL84 push-pull,DIY with a picture tells a story.
  203. DC/DC from 12V to 240V@25mA example
  204. the small SE UL ECL 86 / EY 82
  205. 1934 RCA Radio
  206. Recommendations for wiring a Red LED as a pilot lamp
  207. Retensioning UX4 (300b) tube pin socket
  208. Looking for power transformer source - details inside
  209. High voltage delay circuit
  210. op-amp current source
  211. Conrad Johnson ART II Blow-up
  212. Help In Determining Amplifier's Output
  213. Unknown tube identification help?
  214. 6S45P HP-Amp help with tail CCS
  215. shuguang EL84 question
  216. Audioromy FU29 M828A High Pitch Squeal / Whine / Whistle
  217. Unknown ECC-83
  218. 6MN8 connected as one triode
  219. 7247 and 6GF7A in driver circuits
  220. I'm looking for a PPP with el34
  221. Output transformer measurements
  222. Volume control crackles on SET hooked to F4.
  223. EF80 push EL153, DIY with a picture tells a story.
  224. Audioromy m 828 a / 829b FU29 Bias / Balance Help
  225. The zero bias valve
  226. KT61 testing
  227. SET Stereo Amplifier
  228. Klangfilm 408a Output Transformers
  229. Too Large Grid Resistor?
  230. Sound master # 34 tube amp
  231. Echolette M40 Cap job ... now everything sucks
  232. dual coil choke
  233. looking for ML6 tubes
  234. 220V Transformer question
  235. 1 or 2 watt fire resistant metal film resistors
  236. 6GK5 SRPP
  237. Unknown Amplifier - Anyone recognise it
  238. Help me ID a tube?
  239. Triode electronics difficulties
  240. Can anyone ID this car amp trans?
  241. Multi Stage amplifier bandwidth.
  242. Chassis Question
  243. Converting Stereo SE to Parallel SE Monoblock
  244. Just got a Hickok 539B! Have questions!
  245. Can regulated B+ act like a CCS?
  246. Quad II valve matching
  247. Heater Current - per valve or per triode ?
  248. OT for 12AU7 preamp?
  249. Which James output for a Lacewood SE
  250. Help Matching RCA 5692 Tubes

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