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View Full Version : Tubes / Valves


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  1. Did I use the LR8 in this EF86 preamp correctly?
  2. Who recognizes the chassis of this amp
  3. Sweep tubes in Push-Pull-Parallel
  4. EZ125 Quad KT88 Project
  5. Need a help! OPT design assistant software
  6. Ready To Build the Other
  7. Harman Kardon Citation II
  8. Relays for tube voltages
  9. Okay, Can someone suggest if this PSU can work
  10. ELROG 211 and 845 tubes
  11. Has anyone tried this tube preamp
  12. filament choke testing
  13. Grounded-Grid MC Head Amp for 2x PC900 and Lyra Delos
  14. output transformer sizing - is there such a thing as to big?
  15. Advice for dummies...from a new to the forum dummy
  16. Counterpoint Tech
  17. Line Magnetic 211-IA: Schematic?
  18. Help with harmon kardon a50k
  19. anyone ID these Magnecord amplifiers?
  20. vintage vacuum audio site
  21. Hiraga preamp line+phono 4xECC81 SRPP
  22. Why no simple 2-stage EL34 PP amps?
  23. Dynaco MKIII mod
  24. Blown Up Sir...
  25. Leak stereo20
  26. FFT Hanning Data
  27. Elevated Filament Question
  28. what do you think about this lv linestage?
  29. PCM1798 ECC83/EL84 PP UL balanced combo
  30. I am Trying to Design this Darling Amplifier
  31. Real power pentode recommendation
  32. bridge with CT: can I do that?
  33. Who makes nice pc board for tubes ?
  34. pse300B
  35. 1948 Wireless World - 50 Watt Amp
  36. Akido preamp suggestions.
  37. 6CM5 MKII
  38. DC coupled 6P15P
  39. Switchable 45/VT-52 Amp
  40. Optransformer for 6B4G?
  41. OLSON TUBE AMP AM-158
  42. 6922 preamp idea
  43. Tube SPDIF output
  44. One power tube going hot at idle
  45. schematic to learn by
  46. Audioromy schematic
  47. 8236's
  48. Need a 4060 model on LTSpice
  49. vt86pp 6v6
  50. SALAS hv with 150V
  51. Fender Tweed Champ Kits/Parts
  52. Aikido 12Vac
  53. Looking for expertise in adjusting Williamson amp
  54. Help with elevating a heater supply
  55. Preamp EQ
  56. Need help identifying this amp
  57. Phillips FX737A Rectifier
  58. wiring a transformer on a Scott 299
  59. DC/DC stepup for valve projects
  60. 807 SE Amp
  61. HELP With VOX AC100CPH
  62. Stromberg Carlson ASR 220C blowing fuse
  63. EF806 pentode + CCS
  64. Transformer Identification
  65. Hickok 800A line adjust problem
  66. Heathkit AA 121 parts
  67. Conrad Johnson PV-8: how to convert 110v to 220v
  68. Help me understand Edcor wiring?
  69. Another paralleled to single push-pull EL84 mod.
  70. Sca35 tone controls
  71. Tube preamp noise
  72. Fountek Tube Amp
  73. Choke & Transformer Positioning Problem
  74. The adventure time tube amp- Did any catch it?
  75. Input wiring question
  76. Let's talk triode-pentode
  77. Tried failed, looking for suggestions
  78. Need HELP converting Bogen MX30a pa into a preamp for recording
  79. Edcor Wrong Transformer...
  80. 812A Build
  81. Still not sure where to start
  82. Will cooling fan extend life of old caps & transformers? Or just make worse w dust?
  83. RCA tube amp woes/hum/ground
  84. EF86 microphony
  85. John Broskie Kits
  86. Refurbish Conrad Johnson Premier Eight
  87. 4tube Philco amp project...
  88. Thoughts on bias for PPP
  89. 2012's Acquired Parts- ..Custom Build Anyone?
  90. Can I use a variable voltage cieling fan switch as a variac?
  91. Audio research LS2 hiss and hum... need help
  92. saba electro sound
  93. Ra on C3g and 6C45pi?
  94. Partial Feedback System
  95. An Electronic Loss Compressor
  96. K-12g one channel louder than the other
  97. Sun SV2a3 or 45?
  98. Red imP(asse)
  99. An application of C-Vac: the SolidGlass amplifier
  100. Fixing crooked laminate stacks?
  101. EF184 driver
  102. Woo Audio WA7 temperature
  103. Resistor w/cap or LED or battery bias?
  104. Transformers Back to back vs. Voltage Doubler
  105. 211: 75W or 100W?
  106. Does really need a balanced preamp ?
  107. Power Transformer Hum
  108. Options for how to use this old tube PA amp? > 200W
  109. Flash getter question
  110. Heath W4 Output Xfmr - anyone measure one??
  111. Tube buffer with 6n3-EV
  112. First time with hi-fi, need some advise with amp desing
  113. Newbie wants to build SET 6C33C
  114. Another PP GU50
  115. SE Waveform
  116. Problem with CCS for filaments
  117. UL / Distributed Load - Screen vs. CFB Winding Ratios
  118. 50W PP - KT88 Build
  119. OP Tx and PPP to PP change over
  120. I need a little more advice on a Glassware Janus shunt regularor
  121. Pentode noise
  122. Dynaco ST-35 Circuits
  123. BIG Transformer Covers - Where to Find?
  124. Amplification breaks up after some time
  125. 6A5G schematic; changes from the 6Y6G tube
  126. ECC83 differential preamp optimisation
  127. 6Y6G SE SCHEMATIC NEEDING HELP!
  128. Need help identifying this tube...
  129. AMI DD project. Someone did some mods before me and I don't know whats what.
  130. (v?)Tailor PA-500 Tube Amp
  131. Transformer arrangement?
  132. Don't be stupid, you can't possibly do that with output transformers?
  133. Maximum Plate/Screen Voltage 6550 in UL
  134. Paper insulation for output transformers?
  135. Best PP OPT 30-100W range
  136. Tripath TA2020 + 6N3 Tube buffer
  137. El34 as triode
  138. tube preamp vol ctrl -- before or after?
  139. matisse preamp -review
  140. Ribbon Microphone Preamp
  141. Looking for tubes 6CL8 pentode Triode with lower output ratings
  142. Reducing Signal Level Without Affecting Tone
  143. VTVM/VOM???
  144. Micro amp - all-tube, direct heated, portable and IT FITS
  145. Wiring a 6AS7G to be Push Pull within its own envelope
  146. Wima MKP
  147. Will this circuit work ?
  148. new amp build
  149. MKP DC-LINK vs electrolytic power supply 4 tube amp
  150. Looking for ECC81
  151. Unison Research S6 (old version) auto or fixed bias?
  152. Troubleshooting a restored Edison 12 valve amplifier
  153. Counterpoint SA-220
  154. LTSpice models needed
  155. Magnavox 6V6 amp upgrade
  156. breadboard for tubes
  157. Looking for ideas... 50W OPTs
  158. SE Power Supply PCB
  159. Speakers for the 16LS Stereo Tube Amplifier
  160. will E80CF fit into yaqin 100b
  161. RH84 Rev2 Build w/Premium parts
  162. Single ended KT88 / 6SN7 not enough power
  163. Problem with push-pull KT88
  164. opinions please!
  165. Tube testing 101?
  166. Top aluminum plate from ProtoPanel.com
  167. 6GK5/300B
  168. Screen driven sweep tubes - the return of the evil kink?
  169. Parafeed 45 amps
  170. Has anyone tried the 6p1p EV?
  171. ECC88 mu-follower
  172. Reducing gain of a WE91 type amp
  173. 6sn7 mu-follower
  174. AES Preamp mods
  175. Oh! Darling
  176. Testing 3B22 on Hickok 752a
  177. Has anyone ever used the 6C41C in PP?
  178. RH 6V6
  179. Unholtz-Dickie amp, 4-1000's
  180. Somewhat Newbie..
  181. grounding RCA inputs
  182. ESS9018 I/V
  183. Catode follower with 6N7S (6n7GT)
  184. Recommended RIAA Values for this Circuit
  185. PC board design for PSE amp
  186. Audio Research SP-11 HV Regulator
  187. heathkit SA2
  188. russian 1578 tube production years
  189. partial list of tubes I have
  190. Bench Power Supply Questions ?
  191. Identify this tube?
  192. your input - bulb / led / neon selection for short tester
  193. Potted choke orientation/amp layout
  194. Tamura F-2012
  195. Joining output windings
  196. B&K 650 tube tester
  197. 5687 LTSpice model needed
  198. Can you identify this transformer? 70V line matching?
  199. I had to post this..the 211 in all its glory!
  200. Help with preamp/driver/output setup
  201. Accident - Shorted Cathode to grid!!
  202. Correct B+ for EL84 UL PP
  203. RH807 output transformer....what did you use?
  204. Headphone tube amp with balanced output?
  205. Tube buffer with 6n1p-EV
  206. First little SE
  207. ID Nice Unknown Tube
  208. Bell and Howell Model-601
  209. what should my mulit reader be on to bias yaqin 100b
  210. Fixing an old Tandberg Huldra 6 Radio
  211. 30W sweep tube amp
  212. Atmosphère S-40 with KT88, does someone know about this amp?
  213. What happens when Output transformer max voltage (slightly) exceeded?
  214. what type is the best?
  215. Kiwame carbon resistors
  216. Rocker Switch Wiring
  217. RH6550
  218. Diodes for Marantz 8B
  219. Diodes for Marantz 8B
  220. Telefunken 2430 Opus Resistor Burnout
  221. yaqin 100b with 2 different kt88 valves 2 are Genelex Gold Lion and 2 are Svetlena wi
  222. Conrad Johnson MV40 copy and Fisher OP's
  223. Are EF86 Tubes inherently microphonic?
  224. Counterpoint SA-1000 Hum in left channel Pinging Anatech!
  225. Need a rectifier tube...
  226. Looking for Harman Kardon Allegro A-10 Schematic or PhotoFact.
  227. How much spl can a triode take?
  228. Octal CCDA kit - help needed!
  229. Mod input of 6AU6/6AQ5 amp for iPod
  230. Put a tube on your PC just for fun..
  231. ST35 Cathode Feedback
  232. Series Shunt tube regulator
  233. Help ID this tube ^&$**@# lettering!
  234. Adding a db VU meter to an existing tube mic pre
  235. Quad 22 interstage cap?
  236. First test of my AX84 HI-octane
  237. 4P1L triode PP (40W!!?)
  238. KT88 shootout vintage vs new vs 90
  239. Help needed to identify this british made Amp
  240. PSU II Question
  241. Quality tube buffer with ECC83
  242. K12g Amp Question
  243. Stark 9-66 tube tester - repair help
  244. output transfo problem
  245. Pair of Fisher CA-40 Oddballs
  246. Model 601 tube amp.
  247. Model 601 Tube amp
  248. First power amp build. Is this normal??
  249. Compactronized 6146
  250. Preamp and inverter on B7G base tubes circuit.

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