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  1. Output transformer design
  2. Tubes4HiFi preamp questions
  3. Newbie advice - Phono Preamp/1st electronics build
  4. Got a HeathKit, now what to do?
  5. 4P1L push pull amp with Lundahl zero global feedback
  6. 12AQ5 SE Amp Issue
  7. ISO a motorboat
  8. Tube characteristic - Originates from pre or power amp tubes?
  9. swapping console amps...
  10. swapping console amps...
  11. Hum issue in PAS Aikido
  12. Hammond Transformer Warranty
  13. 6CB5 in triode PP?
  14. Input capacitance when tube is not conducting
  15. What would you build with these output transformers?
  16. Need help with new tube for my amp
  17. Does the method for loading the plate affect gain of the stage?
  18. Slightly Sick Amplifier
  19. OP Tx for signal tubes in Headphone amps
  20. need mac kit 30 transformer
  21. Is this transformer saturation? (pictures inside)
  22. Did I use the LR8 in this EF86 preamp correctly?
  23. Who recognizes the chassis of this amp
  24. Sweep tubes in Push-Pull-Parallel
  25. EZ125 Quad KT88 Project
  26. Need a help! OPT design assistant software
  27. Ready To Build the Other
  28. Harman Kardon Citation II
  29. Relays for tube voltages
  30. Okay, Can someone suggest if this PSU can work
  31. ELROG 211 and 845 tubes
  32. Has anyone tried this tube preamp
  33. filament choke testing
  34. Grounded-Grid MC Head Amp for 2x PC900 and Lyra Delos
  35. output transformer sizing - is there such a thing as to big?
  36. Advice for dummies...from a new to the forum dummy
  37. Counterpoint Tech
  38. Line Magnetic 211-IA: Schematic?
  39. Help with harmon kardon a50k
  40. anyone ID these Magnecord amplifiers?
  41. vintage vacuum audio site
  42. Hiraga preamp line+phono 4xECC81 SRPP
  43. Why no simple 2-stage EL34 PP amps?
  44. Dynaco MKIII mod
  45. Blown Up Sir...
  46. Leak stereo20
  47. FFT Hanning Data
  48. Elevated Filament Question
  49. what do you think about this lv linestage?
  50. PCM1798 ECC83/EL84 PP UL balanced combo
  51. I am Trying to Design this Darling Amplifier
  52. Real power pentode recommendation
  53. bridge with CT: can I do that?
  54. Who makes nice pc board for tubes ?
  55. pse300B
  56. 1948 Wireless World - 50 Watt Amp
  57. Akido preamp suggestions.
  58. 6CM5 MKII
  59. DC coupled 6P15P
  60. Switchable 45/VT-52 Amp
  61. Optransformer for 6B4G?
  62. OLSON TUBE AMP AM-158
  63. 6922 preamp idea
  64. Tube SPDIF output
  65. One power tube going hot at idle
  66. schematic to learn by
  67. Audioromy schematic
  68. 8236's
  69. Need a 4060 model on LTSpice
  70. vt86pp 6v6
  71. SALAS hv with 150V
  72. Aikido 12Vac
  73. Looking for expertise in adjusting Williamson amp
  74. Help with elevating a heater supply
  75. Preamp EQ
  76. Need help identifying this amp
  77. Phillips FX737A Rectifier
  78. wiring a transformer on a Scott 299
  79. DC/DC stepup for valve projects
  80. 807 SE Amp
  81. Stromberg Carlson ASR 220C blowing fuse
  82. EF806 pentode + CCS
  83. Transformer Identification
  84. Hickok 800A line adjust problem
  85. Heathkit AA 121 parts
  86. Conrad Johnson PV-8: how to convert 110v to 220v
  87. Help me understand Edcor wiring?
  88. Another paralleled to single push-pull EL84 mod.
  89. Sca35 tone controls
  90. Tube preamp noise
  91. Fountek Tube Amp
  92. Choke & Transformer Positioning Problem
  93. The adventure time tube amp- Did any catch it?
  94. Input wiring question
  95. Let's talk triode-pentode
  96. Tried failed, looking for suggestions
  97. Need HELP converting Bogen MX30a pa into a preamp for recording
  98. Edcor Wrong Transformer...
  99. 812A Build
  100. Still not sure where to start
  101. Will cooling fan extend life of old caps & transformers? Or just make worse w dust?
  102. RCA tube amp woes/hum/ground
  103. EF86 microphony
  104. John Broskie Kits
  105. Refurbish Conrad Johnson Premier Eight
  106. 4tube Philco amp project...
  107. Thoughts on bias for PPP
  108. 2012's Acquired Parts- ..Custom Build Anyone?
  109. Can I use a variable voltage cieling fan switch as a variac?
  110. Audio research LS2 hiss and hum... need help
  111. saba electro sound
  112. Ra on C3g and 6C45pi?
  113. Partial Feedback System
  114. An Electronic Loss Compressor
  115. K-12g one channel louder than the other
  116. Sun SV2a3 or 45?
  117. Red imP(asse)
  118. An application of C-Vac: the SolidGlass amplifier
  119. Fixing crooked laminate stacks?
  120. EF184 driver
  121. Woo Audio WA7 temperature
  122. Resistor w/cap or LED or battery bias?
  123. Transformers Back to back vs. Voltage Doubler
  124. 211: 75W or 100W?
  125. Does really need a balanced preamp ?
  126. Power Transformer Hum
  127. Options for how to use this old tube PA amp? > 200W
  128. Flash getter question
  129. Heath W4 Output Xfmr - anyone measure one??
  130. Tube buffer with 6n3-EV
  131. First time with hi-fi, need some advise with amp desing
  132. Newbie wants to build SET 6C33C
  133. Another PP GU50
  134. SE Waveform
  135. Problem with CCS for filaments
  136. UL / Distributed Load - Screen vs. CFB Winding Ratios
  137. 50W PP - KT88 Build
  138. OP Tx and PPP to PP change over
  139. I need a little more advice on a Glassware Janus shunt regularor
  140. Pentode noise
  141. Dynaco ST-35 Circuits
  142. BIG Transformer Covers - Where to Find?
  143. Amplification breaks up after some time
  144. 6A5G schematic; changes from the 6Y6G tube
  145. ECC83 differential preamp optimisation
  146. 6Y6G SE SCHEMATIC NEEDING HELP!
  147. Need help identifying this tube...
  148. AMI DD project. Someone did some mods before me and I don't know whats what.
  149. (v?)Tailor PA-500 Tube Amp
  150. Transformer arrangement?
  151. Don't be stupid, you can't possibly do that with output transformers?
  152. Maximum Plate/Screen Voltage 6550 in UL
  153. Paper insulation for output transformers?
  154. Best PP OPT 30-100W range
  155. Tripath TA2020 + 6N3 Tube buffer
  156. El34 as triode
  157. tube preamp vol ctrl -- before or after?
  158. matisse preamp -review
  159. Ribbon Microphone Preamp
  160. Looking for tubes 6CL8 pentode Triode with lower output ratings
  161. Reducing Signal Level Without Affecting Tone
  162. VTVM/VOM???
  163. Micro amp - all-tube, direct heated, portable and IT FITS
  164. Wiring a 6AS7G to be Push Pull within its own envelope
  165. Wima MKP
  166. Will this circuit work ?
  167. new amp build
  168. Looking for ECC81
  169. Unison Research S6 (old version) auto or fixed bias?
  170. Troubleshooting a restored Edison 12 valve amplifier
  171. Counterpoint SA-220
  172. LTSpice models needed
  173. Magnavox 6V6 amp upgrade
  174. breadboard for tubes
  175. Looking for ideas... 50W OPTs
  176. SE Power Supply PCB
  177. Speakers for the 16LS Stereo Tube Amplifier
  178. will E80CF fit into yaqin 100b
  179. RH84 Rev2 Build w/Premium parts
  180. Single ended KT88 / 6SN7 not enough power
  181. Problem with push-pull KT88
  182. opinions please!
  183. Tube testing 101?
  184. Top aluminum plate from ProtoPanel.com
  185. 6GK5/300B
  186. Screen driven sweep tubes - the return of the evil kink?
  187. Parafeed 45 amps
  188. Has anyone tried the 6p1p EV?
  189. ECC88 mu-follower
  190. Reducing gain of a WE91 type amp
  191. 6sn7 mu-follower
  192. AES Preamp mods
  193. Oh! Darling
  194. Testing 3B22 on Hickok 752a
  195. Has anyone ever used the 6C41C in PP?
  196. RH 6V6
  197. Unholtz-Dickie amp, 4-1000's
  198. Somewhat Newbie..
  199. grounding RCA inputs
  200. ESS9018 I/V
  201. Catode follower with 6N7S (6n7GT)
  202. Recommended RIAA Values for this Circuit
  203. PC board design for PSE amp
  204. Audio Research SP-11 HV Regulator
  205. heathkit SA2
  206. russian 1578 tube production years
  207. partial list of tubes I have
  208. Bench Power Supply Questions ?
  209. Identify this tube?
  210. your input - bulb / led / neon selection for short tester
  211. Potted choke orientation/amp layout
  212. Tamura F-2012
  213. Joining output windings
  214. B&K 650 tube tester
  215. 5687 LTSpice model needed
  216. Can you identify this transformer? 70V line matching?
  217. I had to post this..the 211 in all its glory!
  218. Help with preamp/driver/output setup
  219. Accident - Shorted Cathode to grid!!
  220. Correct B+ for EL84 UL PP
  221. RH807 output transformer....what did you use?
  222. Headphone tube amp with balanced output?
  223. Tube buffer with 6n1p-EV
  224. First little SE
  225. ID Nice Unknown Tube
  226. Bell and Howell Model-601
  227. what should my mulit reader be on to bias yaqin 100b
  228. Fixing an old Tandberg Huldra 6 Radio
  229. 30W sweep tube amp
  230. Atmosphère S-40 with KT88, does someone know about this amp?
  231. What happens when Output transformer max voltage (slightly) exceeded?
  232. what type is the best?
  233. Kiwame carbon resistors
  234. Rocker Switch Wiring
  235. RH6550
  236. Diodes for Marantz 8B
  237. Diodes for Marantz 8B
  238. Telefunken 2430 Opus Resistor Burnout
  239. yaqin 100b with 2 different kt88 valves 2 are Genelex Gold Lion and 2 are Svetlena wi
  240. Conrad Johnson MV40 copy and Fisher OP's
  241. Are EF86 Tubes inherently microphonic?
  242. Counterpoint SA-1000 Hum in left channel Pinging Anatech!
  243. Need a rectifier tube...
  244. Looking for Harman Kardon Allegro A-10 Schematic or PhotoFact.
  245. How much spl can a triode take?
  246. Octal CCDA kit - help needed!
  247. Mod input of 6AU6/6AQ5 amp for iPod
  248. Put a tube on your PC just for fun..
  249. ST35 Cathode Feedback
  250. Series Shunt tube regulator

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