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View Full Version : Tubes / Valves


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  1. buying Tube Amps need advice/opinions
  2. Best driver and Power 6V6 By Officina
  3. dynaco pas3
  4. 5U4GB full-wave bridge, stumped
  5. Complete Module Driver and Power with DHT 6B4G
  6. HELP NEEDED for a 6CA4/EZ81 power supply
  7. OT for 2A3 PSE w/Parafeed
  8. More Dynaco Mark VI Questions
  9. curious feedback in circuit of Pioneer SM-Q300 receiver
  10. Hytron 2E25 - Other forgotten and marvelous tube !
  11. need tube upgrade advice please sir
  12. buyer beware
  13. Analog tube for DAC & Power supply with valve EZ_80
  14. JJ 5y3S pin 1??
  15. My first Sansui AU-111 Rebuild
  16. Capacitor-induced distortion
  17. Elevating Heater Voltage with multiple Transformer Heater Secondaries
  18. Common Cathode as DAC output
  19. Pre-Amp with russian tubes 1j24b
  20. How to calculate, the output impedance of a tube with grounded grid
  21. How To Draw Load Line With Output Transformer ?
  22. Inter electrode capacitance.
  23. My amp is an oscillator !
  24. TESLA PL509
  25. What value for Va ?
  26. Help selecting an input transformer ?
  27. Should same valves grid voltage vary much ?
  28. Driver options for 300B-XLS (4P1L-IS-4P1L-IS)
  29. Restoring a Scott 299-B
  30. Latest project, 80 watt valve amplifier
  31. PP Amp Doubling Output Power
  32. Setting up a Wilson current mirror as a differential load
  33. interested in tube amps
  34. Baldwin 45P amp project
  35. DIYGene's Jadis JP-200 Preamp Kit
  36. Need design/schematic for 6H30P driven 6C33C SET
  37. Substitute 6AQ8 for my 6CG7's
  38. 6bq5 tubes in a Heathkit AA-151
  39. Marantz 8b restoration: colour code, prints, schematics
  40. Show me your screen drive circuits
  41. Potting Compounds
  42. Chokes in the ground "plane"
  43. OTL idea
  44. Balance control tip for newbee's
  45. Ebay win - is this any good?
  46. 6sn7 pse amp for altec lansing 604E
  47. "Cockeyed Bridge" with damper diode?
  48. Mac 2100 Hybrid
  49. Single-Stage Hybrid Cascode Power Amp
  50. New to Tube amps, heathkit question
  51. 6AS7 OTL PL build
  52. On Bootstrapping diodes for UL G2 MOSFET
  53. Chasing Aikido "hum"
  54. valve monobloc designs
  55. 7A5 is a good driver for the 300B ?
  56. Parallel Push Pull 6V6 design
  57. Black cat caps?
  58. Soundstage
  59. Brains & Brawn CF : where's the catch ?
  60. ISO-TANGO to quit
  61. Shifting reflective loads using secondary taps?
  62. VTL -- 20 6550's a side and their xfmrs
  63. "Diamond" tube preamp with 12au7
  64. Wich factory made this tube ?
  65. Bootstrapped Cathode Coupled Amplifier
  66. OTL 6AS7
  67. Diode performance testing
  68. Monacor SA-10
  69. Volume Control Hum
  70. Stromberg-Carlson AP-50
  71. 5 wire and 3 wire output transformer change ?
  72. Yaqin mc 10L
  73. Can OTL Ciclotron amp use solid state regulated PS?
  74. Cross-channel overtalk with strange effects
  75. Why 6.3V?
  76. KT88 Williamson Design Questions
  77. Winding a center-tap secondary
  78. HV delay switch
  79. McIntosh MC-30...Balanced Input Feasible?
  80. Designing line driver / pre-amp
  81. Bucking and boosting a tube power transformer
  82. 33A-158M
  83. All DHT integrated amp
  84. 6N1P
  85. basic query - Pete Millett 807 board.
  86. Tube Tester with undocumented tubes
  87. "Fritz" the Boston/RI tube guy - ANYONE know what became of him??
  88. EI yugoslavia gone forever.
  89. Quicksilver 8417 Design - Stay with it or modify?
  90. Looking for some advice on odd preamp noise issue
  91. Tubes in an opamp feedback loop ?
  92. Jensen P-P Cathode Follower
  93. Cathode follower rigorous definition.
  94. Little Bear P3 ?!?! opinions ?
  95. NOS GU-81
  96. OPT endbell color!
  97. Music Angel kt88 with unbalanced output.. help me!
  98. Heater Supply Center Tap
  99. SCA-35 Pot noise
  100. Conrad Johnson MV 55
  101. Comments on 6C33C-B ARG OTL
  102. Construction tips for high voltage amps.
  103. 6L6 bias
  104. came across Mingda Tube king mono blocks
  105. a lot of noise
  106. El84 pp Amp problem
  107. Power on filament current surge question
  108. Its likely a repost but W/e
  109. Scored some 8236's....
  110. What causes valve to glow red inside ?
  111. Tubes and radioisotope decay
  112. PSUDII Question
  113. DIY Bias Buddy
  114. Recommend me a high power OPT
  115. Design Shorting Tubes?
  116. Microsoft Tube Amp and Speakers
  117. S5 K-16LS Tone Control - Help Please
  118. SEUL Circuit for PL519, has anyone here built this?
  119. Motorola three channel
  120. Your own builders book
  121. WE91A - high frequency roll off
  122. Dynaco MarkIII dimensions
  123. Leak TL12+ smoothing capacitors.
  124. Crate Palomino V8 potentiometer replacement
  125. Question about failing 6550 output
  126. Need help converting Ampex 960 R2R to a preamp...
  127. 5751 SPICE Model -- for Poddwatt II
  128. Configuring an Audio Transformer for 8 Ohmsuring
  129. OTL Blocking cap / RC filter
  130. What do you think..OP Tx
  131. Does anyone have GA399MA.pdf?
  132. New Amp Build, First Post
  133. Twisting HV leads
  134. Phono MC/MM Stage like Audio Space Reference Two RIAA Section
  135. Help with AVO MK IV Meter
  136. Why use a pentode?
  137. Filter choke temperature concerns
  138. Is my output transformer damaged?
  139. Parafeed without a cap
  140. Edcor Transformer Problems
  141. From The Daft Idea Department
  142. Do I need a resistor between plates? pic included.
  143. Tube preamp overheating characteristics?
  144. Valve amplifier sounds great
  145. volume pot hum at low and high volume
  146. Thank You
  147. Help Needed ;)
  148. Mullard EL-34: new vs vintage
  149. A new IC for monitoring tubes
  150. 6L6 transformer on EL84
  151. Output transformer design
  152. Tubes4HiFi preamp questions
  153. Newbie advice - Phono Preamp/1st electronics build
  154. Got a HeathKit, now what to do?
  155. 4P1L push pull amp with Lundahl zero global feedback
  156. 12AQ5 SE Amp Issue
  157. ISO a motorboat
  158. Tube characteristic - Originates from pre or power amp tubes?
  159. swapping console amps...
  160. swapping console amps...
  161. Hum issue in PAS Aikido
  162. Hammond Transformer Warranty
  163. 6CB5 in triode PP?
  164. Input capacitance when tube is not conducting
  165. What would you build with these output transformers?
  166. Need help with new tube for my amp
  167. Does the method for loading the plate affect gain of the stage?
  168. Slightly Sick Amplifier
  169. OP Tx for signal tubes in Headphone amps
  170. Listing of Radio Amateur/HAM Flea Markets In Europe
  171. need mac kit 30 transformer
  172. Is this transformer saturation? (pictures inside)
  173. Did I use the LR8 in this EF86 preamp correctly?
  174. Who recognizes the chassis of this amp
  175. Sweep tubes in Push-Pull-Parallel
  176. EZ125 Quad KT88 Project
  177. Need a help! OPT design assistant software
  178. Ready To Build the Other
  179. Harman Kardon Citation II
  180. Relays for tube voltages
  181. Okay, Can someone suggest if this PSU can work
  182. ELROG 211 and 845 tubes
  183. Has anyone tried this tube preamp
  184. filament choke testing
  185. Grounded-Grid MC Head Amp for 2x PC900 and Lyra Delos
  186. output transformer sizing - is there such a thing as to big?
  187. Advice for dummies...from a new to the forum dummy
  188. Counterpoint Tech
  189. Line Magnetic 211-IA: Schematic?
  190. Help with harmon kardon a50k
  191. anyone ID these Magnecord amplifiers?
  192. vintage vacuum audio site
  193. Hiraga preamp line+phono 4xECC81 SRPP
  194. Why no simple 2-stage EL34 PP amps?
  195. Dynaco MKIII mod
  196. Blown Up Sir...
  197. Leak stereo20
  198. FFT Hanning Data
  199. Elevated Filament Question
  200. what do you think about this lv linestage?
  201. PCM1798 ECC83/EL84 PP UL balanced combo
  202. I am Trying to Design this Darling Amplifier
  203. Real power pentode recommendation
  204. bridge with CT: can I do that?
  205. Who makes nice pc board for tubes ?
  206. pse300B
  207. 1948 Wireless World - 50 Watt Amp
  208. Akido preamp suggestions.
  209. 6CM5 MKII
  210. DC coupled 6P15P
  211. Switchable 45/VT-52 Amp
  212. Optransformer for 6B4G?
  213. OLSON TUBE AMP AM-158
  214. 6922 preamp idea
  215. Tube SPDIF output
  216. One power tube going hot at idle
  217. schematic to learn by
  218. Audioromy schematic
  219. 8236's
  220. Need a 4060 model on LTSpice
  221. vt86pp 6v6
  222. SALAS hv with 150V
  223. Fender Tweed Champ Kits/Parts
  224. Aikido 12Vac
  225. Looking for expertise in adjusting Williamson amp
  226. Help with elevating a heater supply
  227. Preamp EQ
  228. Need help identifying this amp
  229. Phillips FX737A Rectifier
  230. wiring a transformer on a Scott 299
  231. DC/DC stepup for valve projects
  232. 807 SE Amp
  233. HELP With VOX AC100CPH
  234. Stromberg Carlson ASR 220C blowing fuse
  235. EF806 pentode + CCS
  236. Transformer Identification
  237. Hickok 800A line adjust problem
  238. Heathkit AA 121 parts
  239. Conrad Johnson PV-8: how to convert 110v to 220v
  240. Help me understand Edcor wiring?
  241. Another paralleled to single push-pull EL84 mod.
  242. Sca35 tone controls
  243. Tube preamp noise
  244. Fountek Tube Amp
  245. Choke & Transformer Positioning Problem
  246. The adventure time tube amp- Did any catch it?
  247. Input wiring question
  248. Let's talk triode-pentode
  249. Tried failed, looking for suggestions
  250. Need HELP converting Bogen MX30a pa into a preamp for recording

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