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View Full Version : Tubes / Valves


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  1. Music Angel kt88 with unbalanced output.. help me!
  2. Heater Supply Center Tap
  3. SCA-35 Pot noise
  4. Conrad Johnson MV 55
  5. Comments on 6C33C-B ARG OTL
  6. Construction tips for high voltage amps.
  7. 6L6 bias
  8. came across Mingda Tube king mono blocks
  9. a lot of noise
  10. El84 pp Amp problem
  11. Power on filament current surge question
  12. Its likely a repost but W/e
  13. Scored some 8236's....
  14. What causes valve to glow red inside ?
  15. Tubes and radioisotope decay
  16. PSUDII Question
  17. DIY Bias Buddy
  18. Recommend me a high power OPT
  19. Design Shorting Tubes?
  20. Microsoft Tube Amp and Speakers
  21. S5 K-16LS Tone Control - Help Please
  22. SEUL Circuit for PL519, has anyone here built this?
  23. Motorola three channel
  24. Your own builders book
  25. WE91A - high frequency roll off
  26. Dynaco MarkIII dimensions
  27. Leak TL12+ smoothing capacitors.
  28. Crate Palomino V8 potentiometer replacement
  29. Question about failing 6550 output
  30. Need help converting Ampex 960 R2R to a preamp...
  31. 5751 SPICE Model -- for Poddwatt II
  32. Configuring an Audio Transformer for 8 Ohmsuring
  33. OTL Blocking cap / RC filter
  34. What do you think..OP Tx
  35. Does anyone have GA399MA.pdf?
  36. New Amp Build, First Post
  37. Twisting HV leads
  38. Phono MC/MM Stage like Audio Space Reference Two RIAA Section
  39. Help with AVO MK IV Meter
  40. Why use a pentode?
  41. Filter choke temperature concerns
  42. Is my output transformer damaged?
  43. Parafeed without a cap
  44. Edcor Transformer Problems
  45. From The Daft Idea Department
  46. Do I need a resistor between plates? pic included.
  47. Tube preamp overheating characteristics?
  48. Valve amplifier sounds great
  49. volume pot hum at low and high volume
  50. Thank You
  51. Help Needed ;)
  52. Mullard EL-34: new vs vintage
  53. A new IC for monitoring tubes
  54. 6L6 transformer on EL84
  55. Output transformer design
  56. Tubes4HiFi preamp questions
  57. Newbie advice - Phono Preamp/1st electronics build
  58. Got a HeathKit, now what to do?
  59. 4P1L push pull amp with Lundahl zero global feedback
  60. 12AQ5 SE Amp Issue
  61. ISO a motorboat
  62. Tube characteristic - Originates from pre or power amp tubes?
  63. swapping console amps...
  64. swapping console amps...
  65. Hum issue in PAS Aikido
  66. Hammond Transformer Warranty
  67. 6CB5 in triode PP?
  68. Input capacitance when tube is not conducting
  69. What would you build with these output transformers?
  70. Need help with new tube for my amp
  71. Does the method for loading the plate affect gain of the stage?
  72. Slightly Sick Amplifier
  73. OP Tx for signal tubes in Headphone amps
  74. Listing of Radio Amateur/HAM Flea Markets In Europe
  75. need mac kit 30 transformer
  76. Is this transformer saturation? (pictures inside)
  77. Did I use the LR8 in this EF86 preamp correctly?
  78. Who recognizes the chassis of this amp
  79. Sweep tubes in Push-Pull-Parallel
  80. EZ125 Quad KT88 Project
  81. Need a help! OPT design assistant software
  82. Ready To Build the Other
  83. Harman Kardon Citation II
  84. Relays for tube voltages
  85. Okay, Can someone suggest if this PSU can work
  86. ELROG 211 and 845 tubes
  87. Has anyone tried this tube preamp
  88. filament choke testing
  89. Grounded-Grid MC Head Amp for 2x PC900 and Lyra Delos
  90. output transformer sizing - is there such a thing as to big?
  91. Advice for dummies...from a new to the forum dummy
  92. Counterpoint Tech
  93. Line Magnetic 211-IA: Schematic?
  94. Help with harmon kardon a50k
  95. anyone ID these Magnecord amplifiers?
  96. vintage vacuum audio site
  97. Hiraga preamp line+phono 4xECC81 SRPP
  98. Why no simple 2-stage EL34 PP amps?
  99. Dynaco MKIII mod
  100. Blown Up Sir...
  101. Leak stereo20
  102. FFT Hanning Data
  103. Elevated Filament Question
  104. what do you think about this lv linestage?
  105. PCM1798 ECC83/EL84 PP UL balanced combo
  106. I am Trying to Design this Darling Amplifier
  107. Real power pentode recommendation
  108. bridge with CT: can I do that?
  109. Who makes nice pc board for tubes ?
  110. pse300B
  111. 1948 Wireless World - 50 Watt Amp
  112. Akido preamp suggestions.
  113. 6CM5 MKII
  114. DC coupled 6P15P
  115. Switchable 45/VT-52 Amp
  116. Optransformer for 6B4G?
  117. OLSON TUBE AMP AM-158
  118. 6922 preamp idea
  119. Tube SPDIF output
  120. One power tube going hot at idle
  121. schematic to learn by
  122. Audioromy schematic
  123. 8236's
  124. Need a 4060 model on LTSpice
  125. vt86pp 6v6
  126. SALAS hv with 150V
  127. Fender Tweed Champ Kits/Parts
  128. Aikido 12Vac
  129. Looking for expertise in adjusting Williamson amp
  130. Help with elevating a heater supply
  131. Preamp EQ
  132. Need help identifying this amp
  133. Phillips FX737A Rectifier
  134. wiring a transformer on a Scott 299
  135. DC/DC stepup for valve projects
  136. 807 SE Amp
  137. HELP With VOX AC100CPH
  138. Stromberg Carlson ASR 220C blowing fuse
  139. EF806 pentode + CCS
  140. Transformer Identification
  141. Hickok 800A line adjust problem
  142. Heathkit AA 121 parts
  143. Conrad Johnson PV-8: how to convert 110v to 220v
  144. Help me understand Edcor wiring?
  145. Another paralleled to single push-pull EL84 mod.
  146. Sca35 tone controls
  147. Tube preamp noise
  148. Fountek Tube Amp
  149. Choke & Transformer Positioning Problem
  150. The adventure time tube amp- Did any catch it?
  151. Input wiring question
  152. Let's talk triode-pentode
  153. Tried failed, looking for suggestions
  154. Need HELP converting Bogen MX30a pa into a preamp for recording
  155. Edcor Wrong Transformer...
  156. 812A Build
  157. Still not sure where to start
  158. Will cooling fan extend life of old caps & transformers? Or just make worse w dust?
  159. RCA tube amp woes/hum/ground
  160. EF86 microphony
  161. John Broskie Kits
  162. Refurbish Conrad Johnson Premier Eight
  163. 4tube Philco amp project...
  164. Thoughts on bias for PPP
  165. 2012's Acquired Parts- ..Custom Build Anyone?
  166. Can I use a variable voltage cieling fan switch as a variac?
  167. Audio research LS2 hiss and hum... need help
  168. saba electro sound
  169. Ra on C3g and 6C45pi?
  170. Partial Feedback System
  171. An Electronic Loss Compressor
  172. K-12g one channel louder than the other
  173. Sun SV2a3 or 45?
  174. Red imP(asse)
  175. An application of C-Vac: the SolidGlass amplifier
  176. Fixing crooked laminate stacks?
  177. EF184 driver
  178. Woo Audio WA7 temperature
  179. Resistor w/cap or LED or battery bias?
  180. Transformers Back to back vs. Voltage Doubler
  181. 211: 75W or 100W?
  182. Does really need a balanced preamp ?
  183. Power Transformer Hum
  184. Options for how to use this old tube PA amp? > 200W
  185. Flash getter question
  186. Heath W4 Output Xfmr - anyone measure one??
  187. Tube buffer with 6n3-EV
  188. First time with hi-fi, need some advise with amp desing
  189. Newbie wants to build SET 6C33C
  190. Another PP GU50
  191. SE Waveform
  192. Problem with CCS for filaments
  193. UL / Distributed Load - Screen vs. CFB Winding Ratios
  194. 50W PP - KT88 Build
  195. OP Tx and PPP to PP change over
  196. I need a little more advice on a Glassware Janus shunt regularor
  197. Pentode noise
  198. Dynaco ST-35 Circuits
  199. BIG Transformer Covers - Where to Find?
  200. Amplification breaks up after some time
  201. 6A5G schematic; changes from the 6Y6G tube
  202. ECC83 differential preamp optimisation
  203. 6Y6G SE SCHEMATIC NEEDING HELP!
  204. Need help identifying this tube...
  205. AMI DD project. Someone did some mods before me and I don't know whats what.
  206. (v?)Tailor PA-500 Tube Amp
  207. Transformer arrangement?
  208. Don't be stupid, you can't possibly do that with output transformers?
  209. Maximum Plate/Screen Voltage 6550 in UL
  210. Paper insulation for output transformers?
  211. Best PP OPT 30-100W range
  212. Tripath TA2020 + 6N3 Tube buffer
  213. El34 as triode
  214. tube preamp vol ctrl -- before or after?
  215. matisse preamp -review
  216. Ribbon Microphone Preamp
  217. Looking for tubes 6CL8 pentode Triode with lower output ratings
  218. Reducing Signal Level Without Affecting Tone
  219. VTVM/VOM???
  220. Micro amp - all-tube, direct heated, portable and IT FITS
  221. Wiring a 6AS7G to be Push Pull within its own envelope
  222. Wima MKP
  223. Will this circuit work ?
  224. new amp build
  225. MKP DC-LINK vs electrolytic power supply 4 tube amp
  226. Looking for ECC81
  227. Unison Research S6 (old version) auto or fixed bias?
  228. Troubleshooting a restored Edison 12 valve amplifier
  229. Counterpoint SA-220
  230. LTSpice models needed
  231. Magnavox 6V6 amp upgrade
  232. breadboard for tubes
  233. Looking for ideas... 50W OPTs
  234. SE Power Supply PCB
  235. Speakers for the 16LS Stereo Tube Amplifier
  236. will E80CF fit into yaqin 100b
  237. RH84 Rev2 Build w/Premium parts
  238. Single ended KT88 / 6SN7 not enough power
  239. Problem with push-pull KT88
  240. opinions please!
  241. Tube testing 101?
  242. Top aluminum plate from ProtoPanel.com
  243. 6GK5/300B
  244. Screen driven sweep tubes - the return of the evil kink?
  245. Parafeed 45 amps
  246. Has anyone tried the 6p1p EV?
  247. ECC88 mu-follower
  248. Reducing gain of a WE91 type amp
  249. 6sn7 mu-follower
  250. AES Preamp mods

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