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  1. Ripple reduction with added voltage compensation to HV
  2. SEVETLANA "SV" 6550 C vs 6550 C
  3. Frank's 6SN7 - plate follower, noise
  4. Help running RH807 at higher voltage
  5. Preamp hum issues
  6. EML mesh plate 2a3 in DRD amp
  7. How to run RH807 at 400V?
  8. Preamp Umbilical - Use Shield as Ground Lead?
  9. Automatic Bias Control sliding bias
  10. Edcor Output Transformer Resistance
  11. Would this be worthwile restoring?
  12. Historic Tube Amplifiers
  13. 6HF5 testing
  14. A quick question about NFB
  15. PAS3 - are the tone controls really *that* bad?
  16. PP OPT in SE mode operation?
  17. Cheap 6n6p double ended push-pull idea - thoughts?
  18. Vintage WE Tubes
  19. SE amplifier advice..
  20. Mineature Tubes
  21. MD SM 102b transformer spec's please
  22. Vintage Marconi radio
  23. second order harmonics
  24. Hybrid amplifier
  25. Input caps for Motorola Console Amps
  26. to much gain
  27. Question - Type 19 tube
  28. alternative for footswitch??
  29. Noob. Help PP EL34 / EF86 both as triode schem.
  30. RH84 SE, pentode driver... advice please
  31. Having an issue with a MOSFET in my Blue Hawaii
  32. Info wanted on OPT....
  33. 6P43P Strange Plate Graphs
  34. Multiple Phono preamp
  35. pas filament supply
  36. HV on high voltage amps
  37. Lageschaar hybrid-connection PSE-KT66
  38. First DIY from scratch
  39. Ballance resistors
  40. casing about SOHA I headphone amp
  41. Any interest in 56 various tubes?
  42. Help with exploding tubes!
  43. My new filiment PS for Push Pull GM70
  44. So what exactly do I have here? Heathcraft EA-2
  45. Please help identify this Amveco toroidal transformer.
  46. first experience with retro electronics
  47. Revising a tube pre-amp: can't find parts?
  48. Info for Pioneer SA-810 tube amp
  49. Has anyone tried tx2575 in cathode resistor?
  50. 12JZ8
  51. Is it OK to drill mounting holes in transformer laminations?
  52. Seeking Sescom Transformer Specs
  53. Calibrating a Sencor ??
  54. Capacitor in parallel with negative feedback resistor
  55. Old electronics repair store closing. Hartford. FYI. Not related
  56. CL ad for tubes in MA. FYI only. Not connected
  57. Distortion in amp after warm up
  58. Re-bias when changing from Triod to Pentode
  59. Yaqin MC-10L - Electricity in volume knob
  60. Newbie question about a 300B amplifier
  61. Modified Wavebourn Tower II ?
  62. Elevated Heater Voltages - 40v?
  63. Free Tubes!
  64. found tube i like, only small bits of red letter,what tube brands used red lettering?
  65. Impedance problem Of O/P Transformer
  66. Runaway tubes or tubes drawing excess current--baffling
  67. croft SD3 CROFT PREAMP
  68. valve phono stage on a budget
  69. Dynaco vs. Dynaclone
  70. Amplifier Problem - Need help!
  71. Idea for a 6n1p preamp
  72. K & K Audio Two Terminal Constant Current Source
  73. Counterpoint SA-12 wackyness
  74. Shuguang SG-50
  75. manley EQP-1A Tube EQ
  76. El34 PP advice needed
  77. Fosgate Punch 800 a4, diagram needed
  78. Power Transfomer For Valve Amp Question
  79. a 'simpler' tube/valve mixer topology
  80. Qustions about centre speaker connection
  81. Using Seperate Preamp to Drive S-5 Electronics K-16LS Integrated Amp?
  82. 0d3 for el84 screen regulator
  83. Edcor XPWR059 power problem
  84. Did bootstrapping pot change it's operation
  85. Transformer wiring (Need Help)
  86. Class-d Hybrid
  87. New test data comparing different 7591's
  88. Eico 666 Tube Tester Freaks Out When Testing Rectifier Tubes
  89. ZKIT2 Zen Triode mono SET amplifier kit
  90. Tango 11146 Output Transformers ?
  91. KT120 Tube
  92. B&K Dyna-Quik 500 test socket 9A shows good tubes as Bad
  93. Mu follower
  94. Aronov LS9100 - any info ???
  95. Tube Preamp Dock
  96. Substituting potentiometers
  97. Grounded grid Zout
  98. HY69 in triode mode...some experience ?
  99. ITA LA 1B SCHEMATICS????
  100. Thoughts on PSU
  101. Bleeder Resistor (Need Help)
  102. use of 12ax7 and 6v6 as 6T9 alternative?
  103. Do I want fast settling or massive filtration in PS?
  104. Positive feedback for amplifier input stage
  105. Rusted OT Issue?
  106. Multiple filament windings
  107. need help with frist tube amp
  108. Testing Western Electric 437a with TV-7D/U ?
  109. Graaf 5050
  110. finished breadboard project
  111. How Much is Too Much Filtering?
  112. 2a3 - for car use?
  113. troubleshooting a Mingda MC34AB
  114. How to repair and refurbish vintage tube amps?
  115. How to repair and refurbish vintage tube amps?
  116. NYAL OTL3 Amps
  117. 6DJ8/6922 rolling... any general consensus on these?
  118. Mullard 12AU7 tests bad when running grid leakage test?
  119. Can you identify this AMP??
  120. effects of different HT voltage
  121. Substituting a 12AX7 for a 12DW7
  122. what to do with 1uF???
  123. Correct power rating for Chicago OT - opinions
  124. Need help with Stancor 1.5 K OPT Tran.
  125. S5 K8-LM mono KIT (total newbie)
  126. Pentode section of 6M11
  127. Looking for goodme proven 2A3 SE project
  128. Music Angel MENG Series EL34 Push Pull Tube Integrated Amp
  129. Tube replacement causes bias problems.
  130. Spectra of tube glow: any data?
  131. Plate Characteristics for 6158 dual triode
  132. Center tap or not...
  133. Connecting G3 to a negative supply on a pentode
  134. Dynaco FM-3 Curcuit Boards
  135. Sonic Frontiers Line 2 schematic
  136. Philips Hi Z radio amp
  137. Need help modifying tube bias circuit
  138. filament transformer current rating
  139. SE OT power tube suggestions please!
  140. What is up with this wave form?
  141. Volume Controls
  142. Help identifying driver stage
  143. Uses for Cheapo 6CB5
  144. Twin DN2540 in TubelabSE?
  145. Bias or loss of power in one channel problem
  146. Drilling a hole in a Tube :)
  147. Tube stage placement in a mongrel (hybrid) amp
  148. Tubelab Single Ended
  149. Quad KT88 driver
  150. Single Ended Output Transformer
  151. 300B with interstage
  152. Problem with Aria (Meng) Mini 6p1 (glowing plate)
  153. possible to filter dips in AC line?
  154. Weston Ammeter Headphone Amp Prototype
  155. What is the fault with this amp?
  156. k-12G turret board version
  157. low voltage "high gain" amp
  158. Wanted: ELNA Cerafine 10000uf 63v New or used
  159. Connect ipod/laptop to old 1950's radio
  160. (Weston Ammeter Headphone Amp Redux ?)
  161. Would it be possible to drive a 300b with new power jfets?
  162. Would it be possible to drive a 300b with new power jfets?
  163. Will KT88 increase output power in Copland CTA-402
  164. Music Angel XD-SE EL34 intermittent thump
  165. OPT with cathode feedback
  166. Rebuilding fisher sa-1000
  167. Little Dot Mk IV SE
  168. EF86 on HICKOK 752a tester..??
  169. Choke power supplies and bypassing.
  170. Load resistor on OPT
  171. Ultimate Octal
  172. Help needed for 6H30 output schematic for DAC
  173. KT88 doubt
  174. Leave it on or turn it off?
  175. Did I do this loadline correctly
  176. Masco MA-35 rebuild
  177. Motorola SE console amp blown fuse
  178. What to do with Telefunken parts?
  179. OT as buffer?
  180. Single ended EL84 Schematic
  181. Pattern for power xmfr magnetic leaking ?
  182. heater voltage
  183. Small Speakers for 5 channel single ended amp
  184. missing circuit components- why?
  185. valve rectifier series resistors
  186. What to do with a 6N14P/ECC84
  187. Info for very rare neon tubes?
  188. UL for EL84. 22-24% is better than the dogma....40% is lowest distortion....
  189. Jan Tube question
  190. 60 watt tubeamp with Low B+
  191. What types of SET rock the hardest?
  192. UTC A16 interstage 300B
  193. 6C33
  194. Need wiring schematic for Conn 6050 amp
  195. 6N6P at very low voltage
  196. Transformer Swap
  197. Need help building a tube linestage for my gainclone
  198. Ping SY: His Master's Noise
  199. Wollensak SE 7591 parts projects?
  200. 807 screen voltage help
  201. My little 801A power amplifier
  202. Help needed finding a small DPST switch - confused!
  203. Help with bias pot- wont adjust!
  204. 6N6P / ECC99 / E182CC
  205. bias question
  206. Really low parts could el84 pp design for a beginner?
  207. moviola tubes -- other names?
  208. DHT with TDA1541A in a NOS DAC?
  209. 6C33C-B Tube Tester
  210. VT100mk2 - Retubing
  211. Parallel 6L6 se iron suggestion.
  212. 6N2 Tube Srpp Drive Stage
  213. Unexpectedly good EL84 amp
  214. Kypo Electronic - Buffer, Preamp & Amp kits
  215. PSU bypass cap type
  216. Yaqin MC10-T
  217. Yaqin MC10-L Need help collating data
  218. Wanted: High Quality Complete tube NOS DAC with TDA1541A
  219. 6360 or 6939 as a phase inverter
  220. Peerless 16687 & 7142 Transformer Identification
  221. Wanted: High Quality DIY Tube NOS DAC with TDA1541A
  222. Restoration of leak stereo 20: advice pls
  223. DC Tube Heaters
  224. Musical Paradise MP-428 300B Amplifier
  225. Tube regulator
  226. Why overvoltage on HT?
  227. 50c5 schematic question
  228. Me again... matrix decoding w/ tubes?
  229. chapman 305 transformer wiring
  230. tube rolling el34 need advice
  231. Adding resistance to OT circuit.
  232. Tube pre-amp + Class-D amp. any experience?
  233. Bias using a ccs as an anode load
  234. Magnepan High Frequency Tube Amp
  235. Home-Made Plate Curves
  236. Vacuum Tube Audio PH-11
  237. Latest project SRPP valve front end with class D MOSFET output stage.
  238. Melos 400 restoration project - need help (unaltered reference needed)
  239. Comparison of Sovtek 5751 and RCA 5751
  240. Replacing electrolytic caps
  241. Heater supply for the 866a
  242. How good is good enough when designing a line stage?
  243. Cathode/plate resistors ??
  244. Tubes and LTspice?
  245. Is this an oscillation problem? -broskie CCA linestage
  246. Simple Octal SET help.
  247. Capacitor Sanity Check
  248. VTVM substitute?
  249. Caps - Mundorf Silver/oil vs silver/gold/oil
  250. What music/sound style for 845 tubes?

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