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View Full Version : Tubes / Valves


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  1. Why no simple 2-stage EL34 PP amps?
  2. Dynaco MKIII mod
  3. Blown Up Sir...
  4. Leak stereo20
  5. FFT Hanning Data
  6. Elevated Filament Question
  7. what do you think about this lv linestage?
  8. PCM1798 ECC83/EL84 PP UL balanced combo
  9. I am Trying to Design this Darling Amplifier
  10. Real power pentode recommendation
  11. bridge with CT: can I do that?
  12. Who makes nice pc board for tubes ?
  13. pse300B
  14. 1948 Wireless World - 50 Watt Amp
  15. Akido preamp suggestions.
  16. 6CM5 MKII
  17. DC coupled 6P15P
  18. Switchable 45/VT-52 Amp
  19. Optransformer for 6B4G?
  20. OLSON TUBE AMP AM-158
  21. 6922 preamp idea
  22. Tube SPDIF output
  23. One power tube going hot at idle
  24. schematic to learn by
  25. Audioromy schematic
  26. 8236's
  27. Need a 4060 model on LTSpice
  28. vt86pp 6v6
  29. SALAS hv with 150V
  30. Fender Tweed Champ Kits/Parts
  31. Aikido 12Vac
  32. Looking for expertise in adjusting Williamson amp
  33. Help with elevating a heater supply
  34. Preamp EQ
  35. Need help identifying this amp
  36. Phillips FX737A Rectifier
  37. wiring a transformer on a Scott 299
  38. DC/DC stepup for valve projects
  39. 807 SE Amp
  40. HELP With VOX AC100CPH
  41. Stromberg Carlson ASR 220C blowing fuse
  42. EF806 pentode + CCS
  43. Transformer Identification
  44. Hickok 800A line adjust problem
  45. Heathkit AA 121 parts
  46. Conrad Johnson PV-8: how to convert 110v to 220v
  47. Help me understand Edcor wiring?
  48. Another paralleled to single push-pull EL84 mod.
  49. Sca35 tone controls
  50. Tube preamp noise
  51. Fountek Tube Amp
  52. Choke & Transformer Positioning Problem
  53. The adventure time tube amp- Did any catch it?
  54. Input wiring question
  55. Let's talk triode-pentode
  56. Tried failed, looking for suggestions
  57. Need HELP converting Bogen MX30a pa into a preamp for recording
  58. Edcor Wrong Transformer...
  59. 812A Build
  60. Still not sure where to start
  61. Will cooling fan extend life of old caps & transformers? Or just make worse w dust?
  62. RCA tube amp woes/hum/ground
  63. EF86 microphony
  64. John Broskie Kits
  65. Refurbish Conrad Johnson Premier Eight
  66. 4tube Philco amp project...
  67. Thoughts on bias for PPP
  68. 2012's Acquired Parts- ..Custom Build Anyone?
  69. Can I use a variable voltage cieling fan switch as a variac?
  70. Audio research LS2 hiss and hum... need help
  71. saba electro sound
  72. Ra on C3g and 6C45pi?
  73. Partial Feedback System
  74. An Electronic Loss Compressor
  75. K-12g one channel louder than the other
  76. Sun SV2a3 or 45?
  77. Red imP(asse)
  78. An application of C-Vac: the SolidGlass amplifier
  79. Fixing crooked laminate stacks?
  80. EF184 driver
  81. Woo Audio WA7 temperature
  82. Resistor w/cap or LED or battery bias?
  83. Transformers Back to back vs. Voltage Doubler
  84. 211: 75W or 100W?
  85. Does really need a balanced preamp ?
  86. Power Transformer Hum
  87. Options for how to use this old tube PA amp? > 200W
  88. Flash getter question
  89. Heath W4 Output Xfmr - anyone measure one??
  90. Tube buffer with 6n3-EV
  91. First time with hi-fi, need some advise with amp desing
  92. Newbie wants to build SET 6C33C
  93. Another PP GU50
  94. SE Waveform
  95. Problem with CCS for filaments
  96. UL / Distributed Load - Screen vs. CFB Winding Ratios
  97. 50W PP - KT88 Build
  98. OP Tx and PPP to PP change over
  99. I need a little more advice on a Glassware Janus shunt regularor
  100. Pentode noise
  101. Dynaco ST-35 Circuits
  102. BIG Transformer Covers - Where to Find?
  103. Amplification breaks up after some time
  104. 6A5G schematic; changes from the 6Y6G tube
  105. ECC83 differential preamp optimisation
  106. 6Y6G SE SCHEMATIC NEEDING HELP!
  107. Need help identifying this tube...
  108. AMI DD project. Someone did some mods before me and I don't know whats what.
  109. (v?)Tailor PA-500 Tube Amp
  110. Transformer arrangement?
  111. Don't be stupid, you can't possibly do that with output transformers?
  112. Maximum Plate/Screen Voltage 6550 in UL
  113. Paper insulation for output transformers?
  114. Best PP OPT 30-100W range
  115. Tripath TA2020 + 6N3 Tube buffer
  116. El34 as triode
  117. tube preamp vol ctrl -- before or after?
  118. matisse preamp -review
  119. Ribbon Microphone Preamp
  120. Looking for tubes 6CL8 pentode Triode with lower output ratings
  121. Reducing Signal Level Without Affecting Tone
  122. VTVM/VOM???
  123. Micro amp - all-tube, direct heated, portable and IT FITS
  124. Wiring a 6AS7G to be Push Pull within its own envelope
  125. Wima MKP
  126. Will this circuit work ?
  127. new amp build
  128. MKP DC-LINK vs electrolytic power supply 4 tube amp
  129. Looking for ECC81
  130. Unison Research S6 (old version) auto or fixed bias?
  131. Troubleshooting a restored Edison 12 valve amplifier
  132. Counterpoint SA-220
  133. LTSpice models needed
  134. Magnavox 6V6 amp upgrade
  135. breadboard for tubes
  136. Looking for ideas... 50W OPTs
  137. SE Power Supply PCB
  138. Speakers for the 16LS Stereo Tube Amplifier
  139. will E80CF fit into yaqin 100b
  140. RH84 Rev2 Build w/Premium parts
  141. Single ended KT88 / 6SN7 not enough power
  142. Problem with push-pull KT88
  143. opinions please!
  144. Tube testing 101?
  145. Top aluminum plate from ProtoPanel.com
  146. 6GK5/300B
  147. Screen driven sweep tubes - the return of the evil kink?
  148. Parafeed 45 amps
  149. Has anyone tried the 6p1p EV?
  150. ECC88 mu-follower
  151. Reducing gain of a WE91 type amp
  152. 6sn7 mu-follower
  153. AES Preamp mods
  154. Oh! Darling
  155. Testing 3B22 on Hickok 752a
  156. Has anyone ever used the 6C41C in PP?
  157. RH 6V6
  158. Unholtz-Dickie amp, 4-1000's
  159. Somewhat Newbie..
  160. grounding RCA inputs
  161. ESS9018 I/V
  162. Catode follower with 6N7S (6n7GT)
  163. Recommended RIAA Values for this Circuit
  164. PC board design for PSE amp
  165. Audio Research SP-11 HV Regulator
  166. heathkit SA2
  167. russian 1578 tube production years
  168. partial list of tubes I have
  169. Bench Power Supply Questions ?
  170. Identify this tube?
  171. your input - bulb / led / neon selection for short tester
  172. Potted choke orientation/amp layout
  173. Tamura F-2012
  174. Joining output windings
  175. B&K 650 tube tester
  176. 5687 LTSpice model needed
  177. Can you identify this transformer? 70V line matching?
  178. I had to post this..the 211 in all its glory!
  179. Help with preamp/driver/output setup
  180. Accident - Shorted Cathode to grid!!
  181. Correct B+ for EL84 UL PP
  182. RH807 output transformer....what did you use?
  183. Headphone tube amp with balanced output?
  184. Tube buffer with 6n1p-EV
  185. First little SE
  186. ID Nice Unknown Tube
  187. Bell and Howell Model-601
  188. what should my mulit reader be on to bias yaqin 100b
  189. Fixing an old Tandberg Huldra 6 Radio
  190. 30W sweep tube amp
  191. Atmosphère S-40 with KT88, does someone know about this amp?
  192. What happens when Output transformer max voltage (slightly) exceeded?
  193. what type is the best?
  194. Kiwame carbon resistors
  195. Rocker Switch Wiring
  196. RH6550
  197. Diodes for Marantz 8B
  198. Diodes for Marantz 8B
  199. Telefunken 2430 Opus Resistor Burnout
  200. yaqin 100b with 2 different kt88 valves 2 are Genelex Gold Lion and 2 are Svetlena wi
  201. Conrad Johnson MV40 copy and Fisher OP's
  202. Are EF86 Tubes inherently microphonic?
  203. Counterpoint SA-1000 Hum in left channel Pinging Anatech!
  204. Need a rectifier tube...
  205. Looking for Harman Kardon Allegro A-10 Schematic or PhotoFact.
  206. How much spl can a triode take?
  207. Octal CCDA kit - help needed!
  208. Mod input of 6AU6/6AQ5 amp for iPod
  209. Put a tube on your PC just for fun..
  210. ST35 Cathode Feedback
  211. Series Shunt tube regulator
  212. Help ID this tube ^&$**@# lettering!
  213. Adding a db VU meter to an existing tube mic pre
  214. Quad 22 interstage cap?
  215. First test of my AX84 HI-octane
  216. 4P1L triode PP (40W!!?)
  217. KT88 shootout vintage vs new vs 90
  218. Help needed to identify this british made Amp
  219. PSU II Question
  220. Quality tube buffer with ECC83
  221. K12g Amp Question
  222. Stark 9-66 tube tester - repair help
  223. output transfo problem
  224. Pair of Fisher CA-40 Oddballs
  225. Model 601 tube amp.
  226. Model 601 Tube amp
  227. First power amp build. Is this normal??
  228. Compactronized 6146
  229. Preamp and inverter on B7G base tubes circuit.
  230. Advice and Suggestions on Amp designs
  231. Help who tube buffer x10-d
  232. EL803S-6CW5 / EL86 amp design check (schematic attached)
  233. amp buzz in one channel on inrush / power on
  234. SE 8-10W monoblock build help
  235. GlassWare Tube CAD
  236. SMD Parts and the DIYer
  237. 6CW5 / EL86 operating point
  238. RH84 power output
  239. 6n6p-ir
  240. Transformer bubbling
  241. Crackling noise.... pls help on Pre-amp
  242. RH84 amp. Plate is 300V. What voltage...
  243. Amplificator Class A 2 X EL504
  244. Help in testing 12ax7 and 7869 tubes
  245. Micro-Cap Tubes Parameters question
  246. Cathode Bypass Capacitor
  247. NOOB ALERT! sooo omany questions.....
  248. IS THIS A REAL E810F ???
  249. Chassis design question / cooling of small signal valves
  250. 5 leads pp output transformer

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