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  1. Does anyone have GA399MA.pdf?
  2. New Amp Build, First Post
  3. Twisting HV leads
  4. Phono MC/MM Stage like Audio Space Reference Two RIAA Section
  5. Help with AVO MK IV Meter
  6. Why use a pentode?
  7. Filter choke temperature concerns
  8. Is my output transformer damaged?
  9. Parafeed without a cap
  10. Edcor Transformer Problems
  11. From The Daft Idea Department
  12. Do I need a resistor between plates? pic included.
  13. Tube preamp overheating characteristics?
  14. Valve amplifier sounds great
  15. volume pot hum at low and high volume
  16. Thank You
  17. Help Needed ;)
  18. Mullard EL-34: new vs vintage
  19. A new IC for monitoring tubes
  20. 6L6 transformer on EL84
  21. Output transformer design
  22. Tubes4HiFi preamp questions
  23. Newbie advice - Phono Preamp/1st electronics build
  24. Got a HeathKit, now what to do?
  25. 4P1L push pull amp with Lundahl zero global feedback
  26. 12AQ5 SE Amp Issue
  27. ISO a motorboat
  28. Tube characteristic - Originates from pre or power amp tubes?
  29. swapping console amps...
  30. swapping console amps...
  31. Hum issue in PAS Aikido
  32. Hammond Transformer Warranty
  33. 6CB5 in triode PP?
  34. Input capacitance when tube is not conducting
  35. What would you build with these output transformers?
  36. Need help with new tube for my amp
  37. Does the method for loading the plate affect gain of the stage?
  38. Slightly Sick Amplifier
  39. OP Tx for signal tubes in Headphone amps
  40. Listing of Radio Amateur/HAM Flea Markets In Europe
  41. need mac kit 30 transformer
  42. Is this transformer saturation? (pictures inside)
  43. Did I use the LR8 in this EF86 preamp correctly?
  44. Who recognizes the chassis of this amp
  45. Sweep tubes in Push-Pull-Parallel
  46. EZ125 Quad KT88 Project
  47. Need a help! OPT design assistant software
  48. Ready To Build the Other
  49. Harman Kardon Citation II
  50. Relays for tube voltages
  51. Okay, Can someone suggest if this PSU can work
  52. ELROG 211 and 845 tubes
  53. Has anyone tried this tube preamp
  54. filament choke testing
  55. Grounded-Grid MC Head Amp for 2x PC900 and Lyra Delos
  56. output transformer sizing - is there such a thing as to big?
  57. Advice for dummies...from a new to the forum dummy
  58. Counterpoint Tech
  59. Line Magnetic 211-IA: Schematic?
  60. Help with harmon kardon a50k
  61. anyone ID these Magnecord amplifiers?
  62. vintage vacuum audio site
  63. Hiraga preamp line+phono 4xECC81 SRPP
  64. Why no simple 2-stage EL34 PP amps?
  65. Dynaco MKIII mod
  66. Blown Up Sir...
  67. Leak stereo20
  68. FFT Hanning Data
  69. Elevated Filament Question
  70. what do you think about this lv linestage?
  71. PCM1798 ECC83/EL84 PP UL balanced combo
  72. I am Trying to Design this Darling Amplifier
  73. Real power pentode recommendation
  74. bridge with CT: can I do that?
  75. Who makes nice pc board for tubes ?
  76. pse300B
  77. 1948 Wireless World - 50 Watt Amp
  78. Akido preamp suggestions.
  79. 6CM5 MKII
  80. DC coupled 6P15P
  81. Switchable 45/VT-52 Amp
  82. Optransformer for 6B4G?
  83. OLSON TUBE AMP AM-158
  84. 6922 preamp idea
  85. Tube SPDIF output
  86. One power tube going hot at idle
  87. schematic to learn by
  88. Audioromy schematic
  89. 8236's
  90. Need a 4060 model on LTSpice
  91. vt86pp 6v6
  92. SALAS hv with 150V
  93. Fender Tweed Champ Kits/Parts
  94. Aikido 12Vac
  95. Looking for expertise in adjusting Williamson amp
  96. Help with elevating a heater supply
  97. Preamp EQ
  98. Need help identifying this amp
  99. Phillips FX737A Rectifier
  100. wiring a transformer on a Scott 299
  101. DC/DC stepup for valve projects
  102. 807 SE Amp
  103. HELP With VOX AC100CPH
  104. Stromberg Carlson ASR 220C blowing fuse
  105. EF806 pentode + CCS
  106. Transformer Identification
  107. Hickok 800A line adjust problem
  108. Heathkit AA 121 parts
  109. Conrad Johnson PV-8: how to convert 110v to 220v
  110. Help me understand Edcor wiring?
  111. Another paralleled to single push-pull EL84 mod.
  112. Sca35 tone controls
  113. Tube preamp noise
  114. Fountek Tube Amp
  115. Choke & Transformer Positioning Problem
  116. The adventure time tube amp- Did any catch it?
  117. Input wiring question
  118. Let's talk triode-pentode
  119. Tried failed, looking for suggestions
  120. Need HELP converting Bogen MX30a pa into a preamp for recording
  121. Edcor Wrong Transformer...
  122. 812A Build
  123. Still not sure where to start
  124. Will cooling fan extend life of old caps & transformers? Or just make worse w dust?
  125. RCA tube amp woes/hum/ground
  126. EF86 microphony
  127. John Broskie Kits
  128. Refurbish Conrad Johnson Premier Eight
  129. 4tube Philco amp project...
  130. Thoughts on bias for PPP
  131. 2012's Acquired Parts- ..Custom Build Anyone?
  132. Can I use a variable voltage cieling fan switch as a variac?
  133. Audio research LS2 hiss and hum... need help
  134. saba electro sound
  135. Ra on C3g and 6C45pi?
  136. Partial Feedback System
  137. An Electronic Loss Compressor
  138. K-12g one channel louder than the other
  139. Sun SV2a3 or 45?
  140. Red imP(asse)
  141. An application of C-Vac: the SolidGlass amplifier
  142. Fixing crooked laminate stacks?
  143. EF184 driver
  144. Woo Audio WA7 temperature
  145. Resistor w/cap or LED or battery bias?
  146. Transformers Back to back vs. Voltage Doubler
  147. 211: 75W or 100W?
  148. Does really need a balanced preamp ?
  149. Power Transformer Hum
  150. Options for how to use this old tube PA amp? > 200W
  151. Flash getter question
  152. Heath W4 Output Xfmr - anyone measure one??
  153. Tube buffer with 6n3-EV
  154. First time with hi-fi, need some advise with amp desing
  155. Newbie wants to build SET 6C33C
  156. Another PP GU50
  157. SE Waveform
  158. Problem with CCS for filaments
  159. UL / Distributed Load - Screen vs. CFB Winding Ratios
  160. 50W PP - KT88 Build
  161. OP Tx and PPP to PP change over
  162. I need a little more advice on a Glassware Janus shunt regularor
  163. Pentode noise
  164. Dynaco ST-35 Circuits
  165. BIG Transformer Covers - Where to Find?
  166. Amplification breaks up after some time
  167. 6A5G schematic; changes from the 6Y6G tube
  168. ECC83 differential preamp optimisation
  169. 6Y6G SE SCHEMATIC NEEDING HELP!
  170. Need help identifying this tube...
  171. AMI DD project. Someone did some mods before me and I don't know whats what.
  172. (v?)Tailor PA-500 Tube Amp
  173. Transformer arrangement?
  174. Don't be stupid, you can't possibly do that with output transformers?
  175. Maximum Plate/Screen Voltage 6550 in UL
  176. Paper insulation for output transformers?
  177. Best PP OPT 30-100W range
  178. Tripath TA2020 + 6N3 Tube buffer
  179. El34 as triode
  180. tube preamp vol ctrl -- before or after?
  181. matisse preamp -review
  182. Ribbon Microphone Preamp
  183. Looking for tubes 6CL8 pentode Triode with lower output ratings
  184. Reducing Signal Level Without Affecting Tone
  185. VTVM/VOM???
  186. Micro amp - all-tube, direct heated, portable and IT FITS
  187. Wiring a 6AS7G to be Push Pull within its own envelope
  188. Wima MKP
  189. Will this circuit work ?
  190. new amp build
  191. MKP DC-LINK vs electrolytic power supply 4 tube amp
  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. Testing 3B22 on Hickok 752a
  219. Has anyone ever used the 6C41C in PP?
  220. RH 6V6
  221. Unholtz-Dickie amp, 4-1000's
  222. Somewhat Newbie..
  223. grounding RCA inputs
  224. ESS9018 I/V
  225. Catode follower with 6N7S (6n7GT)
  226. Recommended RIAA Values for this Circuit
  227. PC board design for PSE amp
  228. Audio Research SP-11 HV Regulator
  229. heathkit SA2
  230. russian 1578 tube production years
  231. partial list of tubes I have
  232. Bench Power Supply Questions ?
  233. Identify this tube?
  234. your input - bulb / led / neon selection for short tester
  235. Potted choke orientation/amp layout
  236. Tamura F-2012
  237. Joining output windings
  238. B&K 650 tube tester
  239. 5687 LTSpice model needed
  240. Can you identify this transformer? 70V line matching?
  241. I had to post this..the 211 in all its glory!
  242. Help with preamp/driver/output setup
  243. Accident - Shorted Cathode to grid!!
  244. Correct B+ for EL84 UL PP
  245. RH807 output transformer....what did you use?
  246. Headphone tube amp with balanced output?
  247. Tube buffer with 6n1p-EV
  248. First little SE
  249. ID Nice Unknown Tube
  250. Bell and Howell Model-601

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