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View Full Version : Tubes / Valves


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  1. interested in tube amps
  2. Baldwin 45P amp project
  3. DIYGene's Jadis JP-200 Preamp Kit
  4. Need design/schematic for 6H30P driven 6C33C SET
  5. Substitute 6AQ8 for my 6CG7's
  6. 6bq5 tubes in a Heathkit AA-151
  7. Marantz 8b restoration: colour code, prints, schematics
  8. Show me your screen drive circuits
  9. Potting Compounds
  10. Chokes in the ground "plane"
  11. OTL idea
  12. Balance control tip for newbee's
  13. Ebay win - is this any good?
  14. 6sn7 pse amp for altec lansing 604E
  15. "Cockeyed Bridge" with damper diode?
  16. Mac 2100 Hybrid
  17. Single-Stage Hybrid Cascode Power Amp
  18. New to Tube amps, heathkit question
  19. 6AS7 OTL PL build
  20. On Bootstrapping diodes for UL G2 MOSFET
  21. Chasing Aikido "hum"
  22. valve monobloc designs
  23. 7A5 is a good driver for the 300B ?
  24. Parallel Push Pull 6V6 design
  25. Black cat caps?
  26. Soundstage
  27. Brains & Brawn CF : where's the catch ?
  28. ISO-TANGO to quit
  29. Shifting reflective loads using secondary taps?
  30. VTL -- 20 6550's a side and their xfmrs
  31. "Diamond" tube preamp with 12au7
  32. Wich factory made this tube ?
  33. Bootstrapped Cathode Coupled Amplifier
  34. OTL 6AS7
  35. Diode performance testing
  36. Monacor SA-10
  37. Volume Control Hum
  38. Stromberg-Carlson AP-50
  39. 5 wire and 3 wire output transformer change ?
  40. Yaqin mc 10L
  41. Can OTL Ciclotron amp use solid state regulated PS?
  42. Cross-channel overtalk with strange effects
  43. Why 6.3V?
  44. KT88 Williamson Design Questions
  45. Winding a center-tap secondary
  46. HV delay switch
  47. McIntosh MC-30...Balanced Input Feasible?
  48. Designing line driver / pre-amp
  49. Bucking and boosting a tube power transformer
  50. 33A-158M
  51. All DHT integrated amp
  52. 6N1P
  53. basic query - Pete Millett 807 board.
  54. Tube Tester with undocumented tubes
  55. "Fritz" the Boston/RI tube guy - ANYONE know what became of him??
  56. EI yugoslavia gone forever.
  57. Quicksilver 8417 Design - Stay with it or modify?
  58. Looking for some advice on odd preamp noise issue
  59. Tubes in an opamp feedback loop ?
  60. Jensen P-P Cathode Follower
  61. Cathode follower rigorous definition.
  62. Little Bear P3 ?!?! opinions ?
  63. NOS GU-81
  64. OPT endbell color!
  65. Music Angel kt88 with unbalanced output.. help me!
  66. Heater Supply Center Tap
  67. SCA-35 Pot noise
  68. Conrad Johnson MV 55
  69. Comments on 6C33C-B ARG OTL
  70. Construction tips for high voltage amps.
  71. 6L6 bias
  72. came across Mingda Tube king mono blocks
  73. a lot of noise
  74. El84 pp Amp problem
  75. Power on filament current surge question
  76. Its likely a repost but W/e
  77. Scored some 8236's....
  78. What causes valve to glow red inside ?
  79. Tubes and radioisotope decay
  80. PSUDII Question
  81. DIY Bias Buddy
  82. Recommend me a high power OPT
  83. Design Shorting Tubes?
  84. Microsoft Tube Amp and Speakers
  85. S5 K-16LS Tone Control - Help Please
  86. SEUL Circuit for PL519, has anyone here built this?
  87. Motorola three channel
  88. Your own builders book
  89. WE91A - high frequency roll off
  90. Dynaco MarkIII dimensions
  91. Leak TL12+ smoothing capacitors.
  92. Crate Palomino V8 potentiometer replacement
  93. Question about failing 6550 output
  94. Need help converting Ampex 960 R2R to a preamp...
  95. 5751 SPICE Model -- for Poddwatt II
  96. Configuring an Audio Transformer for 8 Ohmsuring
  97. OTL Blocking cap / RC filter
  98. What do you think..OP Tx
  99. Does anyone have GA399MA.pdf?
  100. New Amp Build, First Post
  101. Twisting HV leads
  102. Phono MC/MM Stage like Audio Space Reference Two RIAA Section
  103. Help with AVO MK IV Meter
  104. Why use a pentode?
  105. Filter choke temperature concerns
  106. Is my output transformer damaged?
  107. Parafeed without a cap
  108. Edcor Transformer Problems
  109. From The Daft Idea Department
  110. Do I need a resistor between plates? pic included.
  111. Tube preamp overheating characteristics?
  112. Valve amplifier sounds great
  113. volume pot hum at low and high volume
  114. Thank You
  115. Help Needed ;)
  116. Mullard EL-34: new vs vintage
  117. A new IC for monitoring tubes
  118. 6L6 transformer on EL84
  119. Output transformer design
  120. Tubes4HiFi preamp questions
  121. Newbie advice - Phono Preamp/1st electronics build
  122. Got a HeathKit, now what to do?
  123. 4P1L push pull amp with Lundahl zero global feedback
  124. 12AQ5 SE Amp Issue
  125. ISO a motorboat
  126. Tube characteristic - Originates from pre or power amp tubes?
  127. swapping console amps...
  128. swapping console amps...
  129. Hum issue in PAS Aikido
  130. Hammond Transformer Warranty
  131. 6CB5 in triode PP?
  132. Input capacitance when tube is not conducting
  133. What would you build with these output transformers?
  134. Need help with new tube for my amp
  135. Does the method for loading the plate affect gain of the stage?
  136. Slightly Sick Amplifier
  137. OP Tx for signal tubes in Headphone amps
  138. Listing of Radio Amateur/HAM Flea Markets In Europe
  139. need mac kit 30 transformer
  140. Is this transformer saturation? (pictures inside)
  141. Did I use the LR8 in this EF86 preamp correctly?
  142. Who recognizes the chassis of this amp
  143. Sweep tubes in Push-Pull-Parallel
  144. EZ125 Quad KT88 Project
  145. Need a help! OPT design assistant software
  146. Ready To Build the Other
  147. Harman Kardon Citation II
  148. Relays for tube voltages
  149. Okay, Can someone suggest if this PSU can work
  150. ELROG 211 and 845 tubes
  151. Has anyone tried this tube preamp
  152. filament choke testing
  153. Grounded-Grid MC Head Amp for 2x PC900 and Lyra Delos
  154. output transformer sizing - is there such a thing as to big?
  155. Advice for dummies...from a new to the forum dummy
  156. Counterpoint Tech
  157. Line Magnetic 211-IA: Schematic?
  158. Help with harmon kardon a50k
  159. anyone ID these Magnecord amplifiers?
  160. vintage vacuum audio site
  161. Hiraga preamp line+phono 4xECC81 SRPP
  162. Why no simple 2-stage EL34 PP amps?
  163. Dynaco MKIII mod
  164. Blown Up Sir...
  165. Leak stereo20
  166. FFT Hanning Data
  167. Elevated Filament Question
  168. what do you think about this lv linestage?
  169. PCM1798 ECC83/EL84 PP UL balanced combo
  170. I am Trying to Design this Darling Amplifier
  171. Real power pentode recommendation
  172. bridge with CT: can I do that?
  173. Who makes nice pc board for tubes ?
  174. pse300B
  175. 1948 Wireless World - 50 Watt Amp
  176. Akido preamp suggestions.
  177. 6CM5 MKII
  178. DC coupled 6P15P
  179. Switchable 45/VT-52 Amp
  180. Optransformer for 6B4G?
  181. OLSON TUBE AMP AM-158
  182. 6922 preamp idea
  183. Tube SPDIF output
  184. One power tube going hot at idle
  185. schematic to learn by
  186. Audioromy schematic
  187. 8236's
  188. Need a 4060 model on LTSpice
  189. vt86pp 6v6
  190. SALAS hv with 150V
  191. Fender Tweed Champ Kits/Parts
  192. Aikido 12Vac
  193. Looking for expertise in adjusting Williamson amp
  194. Help with elevating a heater supply
  195. Preamp EQ
  196. Need help identifying this amp
  197. Phillips FX737A Rectifier
  198. wiring a transformer on a Scott 299
  199. DC/DC stepup for valve projects
  200. 807 SE Amp
  201. HELP With VOX AC100CPH
  202. Stromberg Carlson ASR 220C blowing fuse
  203. EF806 pentode + CCS
  204. Transformer Identification
  205. Hickok 800A line adjust problem
  206. Heathkit AA 121 parts
  207. Conrad Johnson PV-8: how to convert 110v to 220v
  208. Help me understand Edcor wiring?
  209. Another paralleled to single push-pull EL84 mod.
  210. Sca35 tone controls
  211. Tube preamp noise
  212. Fountek Tube Amp
  213. Choke & Transformer Positioning Problem
  214. The adventure time tube amp- Did any catch it?
  215. Input wiring question
  216. Let's talk triode-pentode
  217. Tried failed, looking for suggestions
  218. Need HELP converting Bogen MX30a pa into a preamp for recording
  219. Edcor Wrong Transformer...
  220. 812A Build
  221. Still not sure where to start
  222. Will cooling fan extend life of old caps & transformers? Or just make worse w dust?
  223. RCA tube amp woes/hum/ground
  224. EF86 microphony
  225. John Broskie Kits
  226. Refurbish Conrad Johnson Premier Eight
  227. 4tube Philco amp project...
  228. Thoughts on bias for PPP
  229. 2012's Acquired Parts- ..Custom Build Anyone?
  230. Can I use a variable voltage cieling fan switch as a variac?
  231. Audio research LS2 hiss and hum... need help
  232. saba electro sound
  233. Ra on C3g and 6C45pi?
  234. Partial Feedback System
  235. An Electronic Loss Compressor
  236. K-12g one channel louder than the other
  237. Sun SV2a3 or 45?
  238. Red imP(asse)
  239. An application of C-Vac: the SolidGlass amplifier
  240. Fixing crooked laminate stacks?
  241. EF184 driver
  242. Woo Audio WA7 temperature
  243. Resistor w/cap or LED or battery bias?
  244. Transformers Back to back vs. Voltage Doubler
  245. 211: 75W or 100W?
  246. Does really need a balanced preamp ?
  247. Power Transformer Hum
  248. Options for how to use this old tube PA amp? > 200W
  249. Flash getter question
  250. Heath W4 Output Xfmr - anyone measure one??

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