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  1. Question about failing 6550 output
  2. Need help converting Ampex 960 R2R to a preamp...
  3. 5751 SPICE Model -- for Poddwatt II
  4. Configuring an Audio Transformer for 8 Ohmsuring
  5. OTL Blocking cap / RC filter
  6. What do you think..OP Tx
  7. Does anyone have GA399MA.pdf?
  8. New Amp Build, First Post
  9. Twisting HV leads
  10. Phono MC/MM Stage like Audio Space Reference Two RIAA Section
  11. Why use a pentode?
  12. Filter choke temperature concerns
  13. Is my output transformer damaged?
  14. Parafeed without a cap
  15. Edcor Transformer Problems
  16. From The Daft Idea Department
  17. Do I need a resistor between plates? pic included.
  18. Tube preamp overheating characteristics?
  19. Valve amplifier sounds great
  20. volume pot hum at low and high volume
  21. Thank You
  22. Help Needed ;)
  23. Mullard EL-34: new vs vintage
  24. A new IC for monitoring tubes
  25. 6L6 transformer on EL84
  26. Output transformer design
  27. Tubes4HiFi preamp questions
  28. Newbie advice - Phono Preamp/1st electronics build
  29. Got a HeathKit, now what to do?
  30. 4P1L push pull amp with Lundahl zero global feedback
  31. 12AQ5 SE Amp Issue
  32. ISO a motorboat
  33. Tube characteristic - Originates from pre or power amp tubes?
  34. swapping console amps...
  35. swapping console amps...
  36. Hum issue in PAS Aikido
  37. Hammond Transformer Warranty
  38. 6CB5 in triode PP?
  39. Input capacitance when tube is not conducting
  40. What would you build with these output transformers?
  41. Need help with new tube for my amp
  42. Does the method for loading the plate affect gain of the stage?
  43. Slightly Sick Amplifier
  44. OP Tx for signal tubes in Headphone amps
  45. need mac kit 30 transformer
  46. Is this transformer saturation? (pictures inside)
  47. Did I use the LR8 in this EF86 preamp correctly?
  48. Who recognizes the chassis of this amp
  49. Sweep tubes in Push-Pull-Parallel
  50. EZ125 Quad KT88 Project
  51. Need a help! OPT design assistant software
  52. Ready To Build the Other
  53. Harman Kardon Citation II
  54. Relays for tube voltages
  55. Okay, Can someone suggest if this PSU can work
  56. ELROG 211 and 845 tubes
  57. Has anyone tried this tube preamp
  58. filament choke testing
  59. Grounded-Grid MC Head Amp for 2x PC900 and Lyra Delos
  60. output transformer sizing - is there such a thing as to big?
  61. Advice for dummies...from a new to the forum dummy
  62. Counterpoint Tech
  63. Line Magnetic 211-IA: Schematic?
  64. Help with harmon kardon a50k
  65. anyone ID these Magnecord amplifiers?
  66. vintage vacuum audio site
  67. Hiraga preamp line+phono 4xECC81 SRPP
  68. Why no simple 2-stage EL34 PP amps?
  69. Dynaco MKIII mod
  70. Blown Up Sir...
  71. Leak stereo20
  72. FFT Hanning Data
  73. Elevated Filament Question
  74. what do you think about this lv linestage?
  75. PCM1798 ECC83/EL84 PP UL balanced combo
  76. I am Trying to Design this Darling Amplifier
  77. Real power pentode recommendation
  78. bridge with CT: can I do that?
  79. Who makes nice pc board for tubes ?
  80. pse300B
  81. 1948 Wireless World - 50 Watt Amp
  82. Akido preamp suggestions.
  83. 6CM5 MKII
  84. DC coupled 6P15P
  85. Switchable 45/VT-52 Amp
  86. Optransformer for 6B4G?
  87. OLSON TUBE AMP AM-158
  88. 6922 preamp idea
  89. Tube SPDIF output
  90. One power tube going hot at idle
  91. schematic to learn by
  92. Audioromy schematic
  93. 8236's
  94. Need a 4060 model on LTSpice
  95. vt86pp 6v6
  96. SALAS hv with 150V
  97. Aikido 12Vac
  98. Looking for expertise in adjusting Williamson amp
  99. Help with elevating a heater supply
  100. Preamp EQ
  101. Need help identifying this amp
  102. Phillips FX737A Rectifier
  103. wiring a transformer on a Scott 299
  104. DC/DC stepup for valve projects
  105. 807 SE Amp
  106. Stromberg Carlson ASR 220C blowing fuse
  107. EF806 pentode + CCS
  108. Transformer Identification
  109. Heathkit AA 121 parts
  110. Conrad Johnson PV-8: how to convert 110v to 220v
  111. Help me understand Edcor wiring?
  112. Another paralleled to single push-pull EL84 mod.
  113. Sca35 tone controls
  114. Tube preamp noise
  115. Fountek Tube Amp
  116. Choke & Transformer Positioning Problem
  117. The adventure time tube amp- Did any catch it?
  118. Input wiring question
  119. Let's talk triode-pentode
  120. Tried failed, looking for suggestions
  121. Need HELP converting Bogen MX30a pa into a preamp for recording
  122. Edcor Wrong Transformer...
  123. 812A Build
  124. Still not sure where to start
  125. Will cooling fan extend life of old caps & transformers? Or just make worse w dust?
  126. RCA tube amp woes/hum/ground
  127. EF86 microphony
  128. John Broskie Kits
  129. Refurbish Conrad Johnson Premier Eight
  130. 4tube Philco amp project...
  131. Thoughts on bias for PPP
  132. 2012's Acquired Parts- ..Custom Build Anyone?
  133. Can I use a variable voltage cieling fan switch as a variac?
  134. Audio research LS2 hiss and hum... need help
  135. saba electro sound
  136. Ra on C3g and 6C45pi?
  137. Partial Feedback System
  138. An Electronic Loss Compressor
  139. K-12g one channel louder than the other
  140. Sun SV2a3 or 45?
  141. Red imP(asse)
  142. An application of C-Vac: the SolidGlass amplifier
  143. Fixing crooked laminate stacks?
  144. EF184 driver
  145. Woo Audio WA7 temperature
  146. Resistor w/cap or LED or battery bias?
  147. Transformers Back to back vs. Voltage Doubler
  148. 211: 75W or 100W?
  149. Does really need a balanced preamp ?
  150. Power Transformer Hum
  151. Options for how to use this old tube PA amp? > 200W
  152. Flash getter question
  153. Heath W4 Output Xfmr - anyone measure one??
  154. Tube buffer with 6n3-EV
  155. First time with hi-fi, need some advise with amp desing
  156. Newbie wants to build SET 6C33C
  157. Another PP GU50
  158. SE Waveform
  159. Problem with CCS for filaments
  160. UL / Distributed Load - Screen vs. CFB Winding Ratios
  161. 50W PP - KT88 Build
  162. OP Tx and PPP to PP change over
  163. I need a little more advice on a Glassware Janus shunt regularor
  164. Pentode noise
  165. Dynaco ST-35 Circuits
  166. BIG Transformer Covers - Where to Find?
  167. Amplification breaks up after some time
  168. 6A5G schematic; changes from the 6Y6G tube
  169. ECC83 differential preamp optimisation
  170. 6Y6G SE SCHEMATIC NEEDING HELP!
  171. Need help identifying this tube...
  172. AMI DD project. Someone did some mods before me and I don't know whats what.
  173. (v?)Tailor PA-500 Tube Amp
  174. Transformer arrangement?
  175. Don't be stupid, you can't possibly do that with output transformers?
  176. Maximum Plate/Screen Voltage 6550 in UL
  177. Paper insulation for output transformers?
  178. Best PP OPT 30-100W range
  179. Tripath TA2020 + 6N3 Tube buffer
  180. El34 as triode
  181. tube preamp vol ctrl -- before or after?
  182. matisse preamp -review
  183. Ribbon Microphone Preamp
  184. Looking for tubes 6CL8 pentode Triode with lower output ratings
  185. Reducing Signal Level Without Affecting Tone
  186. VTVM/VOM???
  187. Micro amp - all-tube, direct heated, portable and IT FITS
  188. Wiring a 6AS7G to be Push Pull within its own envelope
  189. Wima MKP
  190. Will this circuit work ?
  191. new amp build
  192. Looking for ECC81
  193. Unison Research S6 (old version) auto or fixed bias?
  194. Troubleshooting a restored Edison 12 valve amplifier
  195. Counterpoint SA-220
  196. LTSpice models needed
  197. Magnavox 6V6 amp upgrade
  198. breadboard for tubes
  199. Looking for ideas... 50W OPTs
  200. SE Power Supply PCB
  201. Speakers for the 16LS Stereo Tube Amplifier
  202. will E80CF fit into yaqin 100b
  203. RH84 Rev2 Build w/Premium parts
  204. Single ended KT88 / 6SN7 not enough power
  205. Problem with push-pull KT88
  206. opinions please!
  207. Tube testing 101?
  208. Top aluminum plate from ProtoPanel.com
  209. 6GK5/300B
  210. Screen driven sweep tubes - the return of the evil kink?
  211. Parafeed 45 amps
  212. Has anyone tried the 6p1p EV?
  213. ECC88 mu-follower
  214. Reducing gain of a WE91 type amp
  215. 6sn7 mu-follower
  216. AES Preamp mods
  217. Oh! Darling
  218. Has anyone ever used the 6C41C in PP?
  219. RH 6V6
  220. Unholtz-Dickie amp, 4-1000's
  221. Somewhat Newbie..
  222. grounding RCA inputs
  223. ESS9018 I/V
  224. Catode follower with 6N7S (6n7GT)
  225. Recommended RIAA Values for this Circuit
  226. PC board design for PSE amp
  227. Audio Research SP-11 HV Regulator
  228. heathkit SA2
  229. russian 1578 tube production years
  230. partial list of tubes I have
  231. Bench Power Supply Questions ?
  232. Identify this tube?
  233. your input - bulb / led / neon selection for short tester
  234. Potted choke orientation/amp layout
  235. Tamura F-2012
  236. Joining output windings
  237. 5687 LTSpice model needed
  238. Can you identify this transformer? 70V line matching?
  239. I had to post this..the 211 in all its glory!
  240. Help with preamp/driver/output setup
  241. Accident - Shorted Cathode to grid!!
  242. Correct B+ for EL84 UL PP
  243. RH807 output transformer....what did you use?
  244. Headphone tube amp with balanced output?
  245. Tube buffer with 6n1p-EV
  246. First little SE
  247. ID Nice Unknown Tube
  248. Bell and Howell Model-601
  249. what should my mulit reader be on to bias yaqin 100b
  250. Fixing an old Tandberg Huldra 6 Radio

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