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View Full Version : Tubes / Valves


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  1. Need design/schematic for 6H30P driven 6C33C SET
  2. Substitute 6AQ8 for my 6CG7's
  3. 6bq5 tubes in a Heathkit AA-151
  4. Marantz 8b restoration: colour code, prints, schematics
  5. Show me your screen drive circuits
  6. Potting Compounds
  7. Chokes in the ground "plane"
  8. OTL idea
  9. Balance control tip for newbee's
  10. Ebay win - is this any good?
  11. 6sn7 pse amp for altec lansing 604E
  12. "Cockeyed Bridge" with damper diode?
  13. Mac 2100 Hybrid
  14. Single-Stage Hybrid Cascode Power Amp
  15. New to Tube amps, heathkit question
  16. 6AS7 OTL PL build
  17. On Bootstrapping diodes for UL G2 MOSFET
  18. Chasing Aikido "hum"
  19. valve monobloc designs
  20. 7A5 is a good driver for the 300B ?
  21. Parallel Push Pull 6V6 design
  22. Black cat caps?
  23. Soundstage
  24. Brains & Brawn CF : where's the catch ?
  25. ISO-TANGO to quit
  26. Shifting reflective loads using secondary taps?
  27. VTL -- 20 6550's a side and their xfmrs
  28. "Diamond" tube preamp with 12au7
  29. Wich factory made this tube ?
  30. Bootstrapped Cathode Coupled Amplifier
  31. OTL 6AS7
  32. Diode performance testing
  33. Monacor SA-10
  34. Volume Control Hum
  35. Stromberg-Carlson AP-50
  36. 5 wire and 3 wire output transformer change ?
  37. Yaqin mc 10L
  38. Can OTL Ciclotron amp use solid state regulated PS?
  39. Cross-channel overtalk with strange effects
  40. Why 6.3V?
  41. KT88 Williamson Design Questions
  42. Winding a center-tap secondary
  43. HV delay switch
  44. McIntosh MC-30...Balanced Input Feasible?
  45. Designing line driver / pre-amp
  46. Bucking and boosting a tube power transformer
  47. 33A-158M
  48. All DHT integrated amp
  49. 6N1P
  50. basic query - Pete Millett 807 board.
  51. Tube Tester with undocumented tubes
  52. "Fritz" the Boston/RI tube guy - ANYONE know what became of him??
  53. EI yugoslavia gone forever.
  54. Quicksilver 8417 Design - Stay with it or modify?
  55. Looking for some advice on odd preamp noise issue
  56. Tubes in an opamp feedback loop ?
  57. Jensen P-P Cathode Follower
  58. Cathode follower rigorous definition.
  59. Little Bear P3 ?!?! opinions ?
  60. NOS GU-81
  61. OPT endbell color!
  62. Music Angel kt88 with unbalanced output.. help me!
  63. Heater Supply Center Tap
  64. SCA-35 Pot noise
  65. Conrad Johnson MV 55
  66. Comments on 6C33C-B ARG OTL
  67. Construction tips for high voltage amps.
  68. 6L6 bias
  69. came across Mingda Tube king mono blocks
  70. a lot of noise
  71. El84 pp Amp problem
  72. Power on filament current surge question
  73. Its likely a repost but W/e
  74. Scored some 8236's....
  75. What causes valve to glow red inside ?
  76. Tubes and radioisotope decay
  77. PSUDII Question
  78. DIY Bias Buddy
  79. Recommend me a high power OPT
  80. Design Shorting Tubes?
  81. Microsoft Tube Amp and Speakers
  82. S5 K-16LS Tone Control - Help Please
  83. SEUL Circuit for PL519, has anyone here built this?
  84. Motorola three channel
  85. Your own builders book
  86. WE91A - high frequency roll off
  87. Dynaco MarkIII dimensions
  88. Leak TL12+ smoothing capacitors.
  89. Question about failing 6550 output
  90. Need help converting Ampex 960 R2R to a preamp...
  91. 5751 SPICE Model -- for Poddwatt II
  92. Configuring an Audio Transformer for 8 Ohmsuring
  93. OTL Blocking cap / RC filter
  94. What do you think..OP Tx
  95. Does anyone have GA399MA.pdf?
  96. New Amp Build, First Post
  97. Twisting HV leads
  98. Phono MC/MM Stage like Audio Space Reference Two RIAA Section
  99. Help with AVO MK IV Meter
  100. Why use a pentode?
  101. Filter choke temperature concerns
  102. Is my output transformer damaged?
  103. Parafeed without a cap
  104. Edcor Transformer Problems
  105. From The Daft Idea Department
  106. Do I need a resistor between plates? pic included.
  107. Tube preamp overheating characteristics?
  108. Valve amplifier sounds great
  109. volume pot hum at low and high volume
  110. Thank You
  111. Help Needed ;)
  112. Mullard EL-34: new vs vintage
  113. A new IC for monitoring tubes
  114. 6L6 transformer on EL84
  115. Output transformer design
  116. Tubes4HiFi preamp questions
  117. Newbie advice - Phono Preamp/1st electronics build
  118. Got a HeathKit, now what to do?
  119. 4P1L push pull amp with Lundahl zero global feedback
  120. 12AQ5 SE Amp Issue
  121. ISO a motorboat
  122. Tube characteristic - Originates from pre or power amp tubes?
  123. swapping console amps...
  124. swapping console amps...
  125. Hum issue in PAS Aikido
  126. Hammond Transformer Warranty
  127. 6CB5 in triode PP?
  128. Input capacitance when tube is not conducting
  129. What would you build with these output transformers?
  130. Need help with new tube for my amp
  131. Does the method for loading the plate affect gain of the stage?
  132. Slightly Sick Amplifier
  133. OP Tx for signal tubes in Headphone amps
  134. Listing of Radio Amateur/HAM Flea Markets In Europe
  135. need mac kit 30 transformer
  136. Is this transformer saturation? (pictures inside)
  137. Did I use the LR8 in this EF86 preamp correctly?
  138. Who recognizes the chassis of this amp
  139. Sweep tubes in Push-Pull-Parallel
  140. EZ125 Quad KT88 Project
  141. Need a help! OPT design assistant software
  142. Ready To Build the Other
  143. Harman Kardon Citation II
  144. Relays for tube voltages
  145. Okay, Can someone suggest if this PSU can work
  146. ELROG 211 and 845 tubes
  147. Has anyone tried this tube preamp
  148. filament choke testing
  149. Grounded-Grid MC Head Amp for 2x PC900 and Lyra Delos
  150. output transformer sizing - is there such a thing as to big?
  151. Advice for dummies...from a new to the forum dummy
  152. Counterpoint Tech
  153. Line Magnetic 211-IA: Schematic?
  154. Help with harmon kardon a50k
  155. anyone ID these Magnecord amplifiers?
  156. vintage vacuum audio site
  157. Hiraga preamp line+phono 4xECC81 SRPP
  158. Why no simple 2-stage EL34 PP amps?
  159. Dynaco MKIII mod
  160. Blown Up Sir...
  161. Leak stereo20
  162. FFT Hanning Data
  163. Elevated Filament Question
  164. what do you think about this lv linestage?
  165. PCM1798 ECC83/EL84 PP UL balanced combo
  166. I am Trying to Design this Darling Amplifier
  167. Real power pentode recommendation
  168. bridge with CT: can I do that?
  169. Who makes nice pc board for tubes ?
  170. pse300B
  171. 1948 Wireless World - 50 Watt Amp
  172. Akido preamp suggestions.
  173. 6CM5 MKII
  174. DC coupled 6P15P
  175. Switchable 45/VT-52 Amp
  176. Optransformer for 6B4G?
  177. OLSON TUBE AMP AM-158
  178. 6922 preamp idea
  179. Tube SPDIF output
  180. One power tube going hot at idle
  181. schematic to learn by
  182. Audioromy schematic
  183. 8236's
  184. Need a 4060 model on LTSpice
  185. vt86pp 6v6
  186. SALAS hv with 150V
  187. Aikido 12Vac
  188. Looking for expertise in adjusting Williamson amp
  189. Help with elevating a heater supply
  190. Preamp EQ
  191. Need help identifying this amp
  192. Phillips FX737A Rectifier
  193. wiring a transformer on a Scott 299
  194. DC/DC stepup for valve projects
  195. 807 SE Amp
  196. Stromberg Carlson ASR 220C blowing fuse
  197. EF806 pentode + CCS
  198. Transformer Identification
  199. Hickok 800A line adjust problem
  200. Heathkit AA 121 parts
  201. Conrad Johnson PV-8: how to convert 110v to 220v
  202. Help me understand Edcor wiring?
  203. Another paralleled to single push-pull EL84 mod.
  204. Sca35 tone controls
  205. Tube preamp noise
  206. Fountek Tube Amp
  207. Choke & Transformer Positioning Problem
  208. The adventure time tube amp- Did any catch it?
  209. Input wiring question
  210. Let's talk triode-pentode
  211. Tried failed, looking for suggestions
  212. Need HELP converting Bogen MX30a pa into a preamp for recording
  213. Edcor Wrong Transformer...
  214. 812A Build
  215. Still not sure where to start
  216. Will cooling fan extend life of old caps & transformers? Or just make worse w dust?
  217. RCA tube amp woes/hum/ground
  218. EF86 microphony
  219. John Broskie Kits
  220. Refurbish Conrad Johnson Premier Eight
  221. 4tube Philco amp project...
  222. Thoughts on bias for PPP
  223. 2012's Acquired Parts- ..Custom Build Anyone?
  224. Can I use a variable voltage cieling fan switch as a variac?
  225. Audio research LS2 hiss and hum... need help
  226. saba electro sound
  227. Ra on C3g and 6C45pi?
  228. Partial Feedback System
  229. An Electronic Loss Compressor
  230. K-12g one channel louder than the other
  231. Sun SV2a3 or 45?
  232. Red imP(asse)
  233. An application of C-Vac: the SolidGlass amplifier
  234. Fixing crooked laminate stacks?
  235. EF184 driver
  236. Woo Audio WA7 temperature
  237. Resistor w/cap or LED or battery bias?
  238. Transformers Back to back vs. Voltage Doubler
  239. 211: 75W or 100W?
  240. Does really need a balanced preamp ?
  241. Power Transformer Hum
  242. Options for how to use this old tube PA amp? > 200W
  243. Flash getter question
  244. Heath W4 Output Xfmr - anyone measure one??
  245. Tube buffer with 6n3-EV
  246. First time with hi-fi, need some advise with amp desing
  247. Newbie wants to build SET 6C33C
  248. Another PP GU50
  249. SE Waveform
  250. Problem with CCS for filaments

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