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View Full Version : Tubes / Valves


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  1. "Fritz" the Boston/RI tube guy - ANYONE know what became of him??
  2. EI yugoslavia gone forever.
  3. Quicksilver 8417 Design - Stay with it or modify?
  4. Looking for some advice on odd preamp noise issue
  5. Tubes in an opamp feedback loop ?
  6. Jensen P-P Cathode Follower
  7. Cathode follower rigorous definition.
  8. Little Bear P3 ?!?! opinions ?
  9. NOS GU-81
  10. OPT endbell color!
  11. Music Angel kt88 with unbalanced output.. help me!
  12. Heater Supply Center Tap
  13. SCA-35 Pot noise
  14. Conrad Johnson MV 55
  15. Comments on 6C33C-B ARG OTL
  16. Construction tips for high voltage amps.
  17. 6L6 bias
  18. came across Mingda Tube king mono blocks
  19. a lot of noise
  20. El84 pp Amp problem
  21. Power on filament current surge question
  22. Its likely a repost but W/e
  23. Scored some 8236's....
  24. What causes valve to glow red inside ?
  25. Tubes and radioisotope decay
  26. PSUDII Question
  27. DIY Bias Buddy
  28. Recommend me a high power OPT
  29. Design Shorting Tubes?
  30. Microsoft Tube Amp and Speakers
  31. S5 K-16LS Tone Control - Help Please
  32. SEUL Circuit for PL519, has anyone here built this?
  33. Motorola three channel
  34. Your own builders book
  35. WE91A - high frequency roll off
  36. Dynaco MarkIII dimensions
  37. Leak TL12+ smoothing capacitors.
  38. Crate Palomino V8 potentiometer replacement
  39. Question about failing 6550 output
  40. Need help converting Ampex 960 R2R to a preamp...
  41. 5751 SPICE Model -- for Poddwatt II
  42. Configuring an Audio Transformer for 8 Ohmsuring
  43. OTL Blocking cap / RC filter
  44. What do you think..OP Tx
  45. Does anyone have GA399MA.pdf?
  46. New Amp Build, First Post
  47. Twisting HV leads
  48. Phono MC/MM Stage like Audio Space Reference Two RIAA Section
  49. Help with AVO MK IV Meter
  50. Why use a pentode?
  51. Filter choke temperature concerns
  52. Is my output transformer damaged?
  53. Parafeed without a cap
  54. Edcor Transformer Problems
  55. From The Daft Idea Department
  56. Do I need a resistor between plates? pic included.
  57. Tube preamp overheating characteristics?
  58. Valve amplifier sounds great
  59. volume pot hum at low and high volume
  60. Thank You
  61. Help Needed ;)
  62. Mullard EL-34: new vs vintage
  63. A new IC for monitoring tubes
  64. 6L6 transformer on EL84
  65. Output transformer design
  66. Tubes4HiFi preamp questions
  67. Newbie advice - Phono Preamp/1st electronics build
  68. Got a HeathKit, now what to do?
  69. 4P1L push pull amp with Lundahl zero global feedback
  70. 12AQ5 SE Amp Issue
  71. ISO a motorboat
  72. Tube characteristic - Originates from pre or power amp tubes?
  73. swapping console amps...
  74. swapping console amps...
  75. Hum issue in PAS Aikido
  76. Hammond Transformer Warranty
  77. 6CB5 in triode PP?
  78. Input capacitance when tube is not conducting
  79. What would you build with these output transformers?
  80. Need help with new tube for my amp
  81. Does the method for loading the plate affect gain of the stage?
  82. Slightly Sick Amplifier
  83. OP Tx for signal tubes in Headphone amps
  84. Listing of Radio Amateur/HAM Flea Markets In Europe
  85. need mac kit 30 transformer
  86. Is this transformer saturation? (pictures inside)
  87. Did I use the LR8 in this EF86 preamp correctly?
  88. Who recognizes the chassis of this amp
  89. Sweep tubes in Push-Pull-Parallel
  90. EZ125 Quad KT88 Project
  91. Need a help! OPT design assistant software
  92. Ready To Build the Other
  93. Harman Kardon Citation II
  94. Relays for tube voltages
  95. Okay, Can someone suggest if this PSU can work
  96. ELROG 211 and 845 tubes
  97. Has anyone tried this tube preamp
  98. filament choke testing
  99. Grounded-Grid MC Head Amp for 2x PC900 and Lyra Delos
  100. output transformer sizing - is there such a thing as to big?
  101. Advice for dummies...from a new to the forum dummy
  102. Counterpoint Tech
  103. Line Magnetic 211-IA: Schematic?
  104. Help with harmon kardon a50k
  105. anyone ID these Magnecord amplifiers?
  106. vintage vacuum audio site
  107. Hiraga preamp line+phono 4xECC81 SRPP
  108. Why no simple 2-stage EL34 PP amps?
  109. Dynaco MKIII mod
  110. Blown Up Sir...
  111. Leak stereo20
  112. FFT Hanning Data
  113. Elevated Filament Question
  114. what do you think about this lv linestage?
  115. PCM1798 ECC83/EL84 PP UL balanced combo
  116. I am Trying to Design this Darling Amplifier
  117. Real power pentode recommendation
  118. bridge with CT: can I do that?
  119. Who makes nice pc board for tubes ?
  120. pse300B
  121. 1948 Wireless World - 50 Watt Amp
  122. Akido preamp suggestions.
  123. 6CM5 MKII
  124. DC coupled 6P15P
  125. Switchable 45/VT-52 Amp
  126. Optransformer for 6B4G?
  127. OLSON TUBE AMP AM-158
  128. 6922 preamp idea
  129. Tube SPDIF output
  130. One power tube going hot at idle
  131. schematic to learn by
  132. Audioromy schematic
  133. 8236's
  134. Need a 4060 model on LTSpice
  135. vt86pp 6v6
  136. SALAS hv with 150V
  137. Fender Tweed Champ Kits/Parts
  138. Aikido 12Vac
  139. Looking for expertise in adjusting Williamson amp
  140. Help with elevating a heater supply
  141. Preamp EQ
  142. Need help identifying this amp
  143. Phillips FX737A Rectifier
  144. wiring a transformer on a Scott 299
  145. DC/DC stepup for valve projects
  146. 807 SE Amp
  147. HELP With VOX AC100CPH
  148. Stromberg Carlson ASR 220C blowing fuse
  149. EF806 pentode + CCS
  150. Transformer Identification
  151. Hickok 800A line adjust problem
  152. Heathkit AA 121 parts
  153. Conrad Johnson PV-8: how to convert 110v to 220v
  154. Help me understand Edcor wiring?
  155. Another paralleled to single push-pull EL84 mod.
  156. Sca35 tone controls
  157. Tube preamp noise
  158. Fountek Tube Amp
  159. Choke & Transformer Positioning Problem
  160. The adventure time tube amp- Did any catch it?
  161. Input wiring question
  162. Let's talk triode-pentode
  163. Tried failed, looking for suggestions
  164. Need HELP converting Bogen MX30a pa into a preamp for recording
  165. Edcor Wrong Transformer...
  166. 812A Build
  167. Still not sure where to start
  168. Will cooling fan extend life of old caps & transformers? Or just make worse w dust?
  169. RCA tube amp woes/hum/ground
  170. EF86 microphony
  171. John Broskie Kits
  172. Refurbish Conrad Johnson Premier Eight
  173. 4tube Philco amp project...
  174. Thoughts on bias for PPP
  175. 2012's Acquired Parts- ..Custom Build Anyone?
  176. Can I use a variable voltage cieling fan switch as a variac?
  177. Audio research LS2 hiss and hum... need help
  178. saba electro sound
  179. Ra on C3g and 6C45pi?
  180. Partial Feedback System
  181. An Electronic Loss Compressor
  182. K-12g one channel louder than the other
  183. Sun SV2a3 or 45?
  184. Red imP(asse)
  185. An application of C-Vac: the SolidGlass amplifier
  186. Fixing crooked laminate stacks?
  187. EF184 driver
  188. Woo Audio WA7 temperature
  189. Resistor w/cap or LED or battery bias?
  190. Transformers Back to back vs. Voltage Doubler
  191. 211: 75W or 100W?
  192. Does really need a balanced preamp ?
  193. Power Transformer Hum
  194. Options for how to use this old tube PA amp? > 200W
  195. Flash getter question
  196. Heath W4 Output Xfmr - anyone measure one??
  197. Tube buffer with 6n3-EV
  198. First time with hi-fi, need some advise with amp desing
  199. Newbie wants to build SET 6C33C
  200. Another PP GU50
  201. SE Waveform
  202. Problem with CCS for filaments
  203. UL / Distributed Load - Screen vs. CFB Winding Ratios
  204. 50W PP - KT88 Build
  205. OP Tx and PPP to PP change over
  206. I need a little more advice on a Glassware Janus shunt regularor
  207. Pentode noise
  208. Dynaco ST-35 Circuits
  209. BIG Transformer Covers - Where to Find?
  210. Amplification breaks up after some time
  211. 6A5G schematic; changes from the 6Y6G tube
  212. ECC83 differential preamp optimisation
  213. 6Y6G SE SCHEMATIC NEEDING HELP!
  214. Need help identifying this tube...
  215. AMI DD project. Someone did some mods before me and I don't know whats what.
  216. (v?)Tailor PA-500 Tube Amp
  217. Transformer arrangement?
  218. Don't be stupid, you can't possibly do that with output transformers?
  219. Maximum Plate/Screen Voltage 6550 in UL
  220. Paper insulation for output transformers?
  221. Best PP OPT 30-100W range
  222. Tripath TA2020 + 6N3 Tube buffer
  223. El34 as triode
  224. tube preamp vol ctrl -- before or after?
  225. matisse preamp -review
  226. Ribbon Microphone Preamp
  227. Looking for tubes 6CL8 pentode Triode with lower output ratings
  228. Reducing Signal Level Without Affecting Tone
  229. VTVM/VOM???
  230. Micro amp - all-tube, direct heated, portable and IT FITS
  231. Wiring a 6AS7G to be Push Pull within its own envelope
  232. Wima MKP
  233. Will this circuit work ?
  234. new amp build
  235. MKP DC-LINK vs electrolytic power supply 4 tube amp
  236. Looking for ECC81
  237. Unison Research S6 (old version) auto or fixed bias?
  238. Troubleshooting a restored Edison 12 valve amplifier
  239. Counterpoint SA-220
  240. LTSpice models needed
  241. Magnavox 6V6 amp upgrade
  242. breadboard for tubes
  243. Looking for ideas... 50W OPTs
  244. SE Power Supply PCB
  245. Speakers for the 16LS Stereo Tube Amplifier
  246. will E80CF fit into yaqin 100b
  247. RH84 Rev2 Build w/Premium parts
  248. Single ended KT88 / 6SN7 not enough power
  249. Problem with push-pull KT88
  250. opinions please!

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