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  1. Anyone use 872-A Mercury Vapor Rectifier Tube
  2. Need recapping tube radio advice
  3. Thinking about getting Philco model 14
  4. Mixed Bias for an EL34 ? Any recommendations / experience ?
  5. PP oscillation with toroid output transformer
  6. 6B4G New Amp Build Issue
  7. Mable Audio 300B Amp KitI
  8. Help me understand - 7061 vs. 12ab5 (and the rest of the 6V6 family)
  9. ebay seller jellyfishaudio
  10. 866a rectifier on 6.3vct@10A
  11. Vintage tube preamp design
  12. Output Transformer Wiring
  13. Ground loop problems
  14. Reversed preamp OPT as IPT
  15. A2 p-p with Millett driver
  16. DC filament supply schematic
  17. Mystery tube
  18. 6eu7/6bq5 feedback question
  19. Ultimate Ultralinear Amp...please help to understand...
  20. Mullard 20 Watt Amp
  21. Transformer feedback winding: Tamura HN-1
  22. the big one
  23. ECC33 vs 6SN7 - Implications I should know?
  24. What is a Source Measure unit (SMU)?
  25. Building a tube amp from scratch
  26. Priboj (priboi) 50, small problem (SOVIET TUBE AMP)
  27. Kellogg (Dukane?) Tube PA Amp
  28. APPJ PA1501
  29. New production 6L6GC tubes and similar
  30. Knight 10W 6V6 push-pull tube power amp
  31. 480vct at 50VA for less than $12 shipped
  32. Pioneer SA-81 integrated tube amp
  33. 12B4 Preamp Design/Pre-build Questions
  34. Can I mount a 5R4WGA at a 10 degree angle?
  35. plate current variation with fixed bias
  36. 5693 issue
  37. Hum SOLVED!!!!
  38. Garage System Control/Preamp idea
  39. Aikido Octal line stage kit info needed
  40. Phonola suitcase player...now, with hum!
  41. My latests (well ... first) RIAA preamp
  42. 12at7 one side drawers 10% more current
  43. Upgrade output transfomers, EL34 single-ended
  44. cleaning tubes / valves
  45. a simple (I think) Baxandall question
  46. Paoli Model 60M help
  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. Unusual Schematic help
  54. 12AX7 vs 12AT7 vs 12AU7
  55. 6SN7 Distortion Canceling in Amp
  56. D-115 w/ weak channel
  57. MOSFET Follower Choices
  58. Sanity check my unlabeled transformer guesstimates? Fisher X-200 power trafo
  59. Mystery Tube Time
  60. PSU simulation help
  61. Vacuum tubes and wire wrap
  62. LTP phase splitter as output stage?
  63. Swap 6B4G for 6SL7 SRPP ?
  64. Need Fuse Values for 6922 Tube Premp, 6.3v & B+ Fuse Value
  65. 12AX7 tone control with low B+ voltage
  66. Cathodefollower and strange behaviour with lowering of anode voltage.
  67. Early Audio Research Dual 100 Schematic?
  68. current drive
  69. Bench Supply
  70. 6X5 GT Hybrid rectifier
  71. small shrouded PP OPT choices ?
  72. Single triode instead of double triode?
  73. Low noise valve tube circuit ideas for cassette deck
  74. Found a box of various 9 pin tubes....
  75. 12AU7 internally matched triodes
  76. Homemade tube socket adaptor
  77. Who's mark was on this obvious 6n23p?
  78. Thoughts on amp mods
  79. Just a quick thanks to you guys
  80. Low voltage tube line preamp
  81. What the difference between 6H7C & 6H8C tubes
  82. Headphone amp OTL
  83. Recommend design for low cost DIY valve amp
  84. need help with short
  85. Simple 1-device gyrators
  86. Need assist - Melos 110 Preamp
  87. Bad capacitor?
  88. Does someone has info about this tubes ?
  89. 2c26a
  90. Help identifying vintage tube amp connector
  91. What make is this E88CC ?
  92. Valve amp - vanishing bass
  93. 5Z3P 6N9P EL34B SE amplifier
  94. Wrapping my head around cathode followers. Does this explanation make sense?
  95. HK A500 rebuild
  96. LS7B Marantz 7 Clone PreAmp
  97. SS to drive 300b
  98. is the 12ax7 ever used on television sets?
  99. What topology was this old RCA power transformer designed for?
  100. BOM of Audio Research SP-11 MkII and D-115 MkII
  101. ECC88/6DJ8 at higher Va
  102. Valve headphone amp humming through headphones
  103. Merlin's new hi-fi valve preamp book is released
  104. Screen Drive 6BQ6GT Amp - Feasibility Study
  105. Harmon Kardon A50K project
  106. Reading high V through resistor/cap casings
  107. Troubleshooting magnavox 9302-00
  108. Vintage 1990's Audio Note 2k5 output transformer wiring color code
  109. Splitting the audio band into two transformers
  110. 21LG6/A P-P for 50+ watts?
  111. Anyone use an IEC line filter plug??
  112. pre Line 2 end Line 3
  113. NEW D3a equivalent on marked?
  114. Anyone tried Plitron transformers?
  115. Summing channels;Why? JE EL34
  116. TAJ's Harman Kardon Citation V rebuild thread
  117. Cascode question re shunt to lower tube
  118. LED biasing in preamp - cap in parallel required?
  119. Can you identify these tube amplifiers? 4x807 & mercury vapor rectifiers
  120. Amperex BB ECC82 - Real or Fake?
  121. Max screen grid voltages in datasheets
  122. Tube rectifiers
  123. VT-25/10Y tubes
  124. Does anyone have the schematic for Transcendant Sound Mini Beast?
  125. Schematic help please
  126. Faulty rectifier valve possibly damaged my amplifier - help
  127. 6J1 tube buffer circuit diagram
  128. Filament transformer question
  129. Grundig 9060 output transformer identifying
  130. 6J1 biasing inconsistencies with datasheet
  131. Separate transformer for heaters. How to reference this to ground?
  132. 300B alternatives
  133. Stereo to Mono transformer based 'hybrid/bridging mixer'
  134. LK-48 over voltage
  135. Aikido all in one
  136. Bitsa Amp project
  137. Search for thread/article about phono preamp design
  138. Fusing valve amps
  139. AIKIDO line stage
  140. Cossor 61SPT - any experience?
  141. 6BG6GA PP, -bias, Amp built but couple problems
  142. GE 6sn7 made in Italy
  143. First SE Amp Build
  144. HV soft start
  145. Setup Question (do I really need the gain from a preamp)
  146. Your opinions please
  147. design advise
  148. audio note oto
  149. Iv got a 100w OPT That needs a circuit
  150. Powerful tube amp / unmatched tubes in parallel
  151. Need help: I have 807s and the guts from a HK AA-100
  152. SE EL34 and speakers
  153. 6AK10 LTP with CCS question
  154. Is a heater voltage of 6.7 cause for concern?
  155. ming da mc 845 aa modification
  156. How good can this headphone amp/pre amp be?
  157. Zero Bias Solution?
  158. Cathode Degeneration with CCS plate load- My Mistake
  159. Pilot 240 with too much bass-- circuit modification needed?
  160. EL34 DIY "centre-tapped" tube ??
  161. Advice for Super Cheap & Simple 829b based amp from spare parts
  162. Infineon IPA50R140CP N-channel mosfet
  163. Borberly Op amp 4 Tube Mosfet hybrid
  164. Splitting Power Supply Choke Question
  165. Toroidal PT as OPT in big power application?
  166. Inrush limiter question
  167. Counterpoint AS-5.1 Tube Type Question
  168. OPT connections
  169. Help teach a CS guy to test a tube amp!
  170. Now THIS is an output transformer
  171. Gas rectifier vs vacuum rectifier
  172. What value for the bias resistor of a SE 6550?
  173. ELL80 tube-Ultralinear mode???
  174. Russian "6L6" ID
  175. Tube amp for a car lol
  176. S5 Electronics Upgrade
  177. Best Tube for SPUD Amp
  178. Zenith 7b31 EL84 Tube Amp Low Volume
  179. Heater cathode elevation
  180. 6K5GT & EL36 AMP
  181. Grid stopper by ECC83
  182. 6L6 Without Screen Drive?
  183. Fusion Postmodernism and tube amps ---- 6SN7 + 26 45
  184. Mullard V.T.52 Push-Pull Tube AMP.
  185. Amp for Magneplaner 1,6/R
  186. Car tube amp- looking for advice
  187. Direct replacement for 5Z3PA and 5Z3P Rectifier
  188. 83 Rectifier
  189. Ground noise and hum: why and how to maybe fix it
  190. How to measure SNR?
  191. Triode vs Pentode cathode followers
  192. Damaged tubes
  193. 2W on 8Ohm OTL amplifier?
  194. EC88 dirver PL84 push-pull,DIY with a picture tells a story.
  195. the small SE UL ECL 86 / EY 82
  196. 1934 RCA Radio
  197. Recommendations for wiring a Red LED as a pilot lamp
  198. Retensioning UX4 (300b) tube pin socket
  199. Looking for power transformer source - details inside
  200. High voltage delay circuit
  201. op-amp current source
  202. Conrad Johnson ART II Blow-up
  203. Help In Determining Amplifier's Output
  204. Unknown tube identification help?
  205. 6S45P HP-Amp help with tail CCS
  206. shuguang EL84 question
  207. Audioromy FU29 M828A High Pitch Squeal / Whine / Whistle
  208. Unknown ECC-83
  209. 6MN8 connected as one triode
  210. 7247 and 6GF7A in driver circuits
  211. I'm looking for a PPP with el34
  212. Output transformer measurements
  213. Volume control crackles on SET hooked to F4.
  214. EF80 push EL153, DIY with a picture tells a story.
  215. Audioromy M828A/829B FU29 Bias/Balance Help
  216. The zero bias valve
  217. KT61 testing
  218. SET Stereo Amplifier
  219. Klangfilm 408a Output Transformers
  220. Too Large Grid Resistor?
  221. Sound master # 34 tube amp
  222. dual coil choke
  223. looking for ML6 tubes
  224. 220V Transformer question
  225. 6GK5 SRPP
  226. Unknown Amplifier - Anyone recognise it
  227. Help me ID a tube?
  228. Triode electronics difficulties
  229. Can anyone ID this car amp trans?
  230. Multi Stage amplifier bandwidth.
  231. Chassis Question
  232. Converting Stereo SE to Parallel SE Monoblock
  233. Can regulated B+ act like a CCS?
  234. Quad II valve matching
  235. Heater Current - per valve or per triode ?
  236. OT for 12AU7 preamp?
  237. Which James output for a Lacewood SE
  238. Help Matching RCA 5692 Tubes
  239. Yet another ECL82 se
  240. Psvane 211-TII ... Pushing them above 75W Pa
  241. Fisher X 100 A restoration questions?
  242. Brook 12A Q
  243. HT voltage for preamp circuit vs output circuit
  244. Please explain this H3 3rd harmonic cancellation
  245. Recommended speaker selector for tube amplifiers?
  246. Should I use a choke?
  247. 12DW7/7427 tube question
  248. philips 228 radiogram
  249. soft start and delay start - help please
  250. Grounding and GFCI circuits

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