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View Full Version : Tubes / Valves


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  1. SE 6L6 to KT88
  2. HT power supply design
  3. Good tubes for concertina - 4P1L maybe?
  4. Powr supply question
  5. What is wrong with this Amplifier?
  6. Palmer DREI - Three SE Output Tubes Together?
  7. Heathkit TC-2 Checker and KT88s
  8. my Dummy Amp Contraption
  9. HF Oscillation Heat-Up Spk's Magnet!?
  10. Triode calculations
  11. Western Electric 131
  12. Electrolytic vs. Film 2A3 Cathode Bypass?
  13. Sylvania JAN 6SN7WGTA, late 1970's
  14. TV7 tester problem with 6CB5A tube
  15. Stromberg-Carlson AP-55
  16. SHUGUANG 2A3
  17. Circuit breaker help.
  18. Recommend me a bookshelf speaker for 5W
  19. Monarch STA 100X weird?
  20. 1954 US Army "Sound Repeater" amplifier
  21. 6N7...this configuration work ?
  22. RIAA Active EQ
  23. Direct Coupled E-Linear Amp
  24. Double Triode Mu
  25. Music Angel kt88 new pcbs problem
  26. EL503 replacement?
  27. Reducing gain in a SRPP circuit with ECC82?
  28. 12XX7 Triodes
  29. Output Tx just for interest
  30. Valab in Taiwan output transformers
  31. Impedance Question
  32. How to include a dual triode tube in a KiCAD schematic?
  33. 12U7 SPICE Model
  34. Phono Stage Woofer Bounce
  35. Problem with new L3-3 please help!
  36. Edcor output transformer...very nice !!!
  37. SE Hybrid Amp "The Lunatic one"
  38. Marantz 8b power transformer B+ down 30%
  39. Single or paralell trafo?
  40. CJ PV 5 Impedance?
  41. ECF80 driving EL84 PP
  42. Luhdahl LL1660S what current rating for D3a driver?
  43. what's that cap?
  44. SE EL84 Component placement Suggestion
  45. How to make a cheap 6N3 Buffer Amp even better?
  46. buying Tube Amps need advice/opinions
  47. Best driver and Power 6V6 By Officina
  48. dynaco pas3
  49. 5U4GB full-wave bridge, stumped
  50. Complete Module Driver and Power with DHT 6B4G
  51. HELP NEEDED for a 6CA4/EZ81 power supply
  52. OT for 2A3 PSE w/Parafeed
  53. More Dynaco Mark VI Questions
  54. curious feedback in circuit of Pioneer SM-Q300 receiver
  55. Hytron 2E25 - Other forgotten and marvelous tube !
  56. need tube upgrade advice please sir
  57. buyer beware
  58. Analog tube for DAC & Power supply with valve EZ_80
  59. JJ 5y3S pin 1??
  60. My first Sansui AU-111 Rebuild
  61. Capacitor-induced distortion
  62. Elevating Heater Voltage with multiple Transformer Heater Secondaries
  63. Common Cathode as DAC output
  64. Pre-Amp with russian tubes 1j24b
  65. How to calculate, the output impedance of a tube with grounded grid
  66. How To Draw Load Line With Output Transformer ?
  67. Inter electrode capacitance.
  68. My amp is an oscillator !
  69. TESLA PL509
  70. What value for Va ?
  71. Help selecting an input transformer ?
  72. Should same valves grid voltage vary much ?
  73. Driver options for 300B-XLS (4P1L-IS-4P1L-IS)
  74. Restoring a Scott 299-B
  75. Latest project, 80 watt valve amplifier
  76. PP Amp Doubling Output Power
  77. Setting up a Wilson current mirror as a differential load
  78. interested in tube amps
  79. Baldwin 45P amp project
  80. DIYGene's Jadis JP-200 Preamp Kit
  81. Need design/schematic for 6H30P driven 6C33C SET
  82. Substitute 6AQ8 for my 6CG7's
  83. 6bq5 tubes in a Heathkit AA-151
  84. Marantz 8b restoration: colour code, prints, schematics
  85. Show me your screen drive circuits
  86. Potting Compounds
  87. Chokes in the ground "plane"
  88. OTL idea
  89. Balance control tip for newbee's
  90. Ebay win - is this any good?
  91. 6sn7 pse amp for altec lansing 604E
  92. "Cockeyed Bridge" with damper diode?
  93. Mac 2100 Hybrid
  94. Single-Stage Hybrid Cascode Power Amp
  95. New to Tube amps, heathkit question
  96. 6AS7 OTL PL build
  97. On Bootstrapping diodes for UL G2 MOSFET
  98. Chasing Aikido "hum"
  99. valve monobloc designs
  100. 7A5 is a good driver for the 300B ?
  101. Parallel Push Pull 6V6 design
  102. Black cat caps?
  103. Soundstage
  104. Brains & Brawn CF : where's the catch ?
  105. ISO-TANGO to quit
  106. Shifting reflective loads using secondary taps?
  107. VTL -- 20 6550's a side and their xfmrs
  108. "Diamond" tube preamp with 12au7
  109. Wich factory made this tube ?
  110. Bootstrapped Cathode Coupled Amplifier
  111. OTL 6AS7
  112. Diode performance testing
  113. Monacor SA-10
  114. Volume Control Hum
  115. Stromberg-Carlson AP-50
  116. 5 wire and 3 wire output transformer change ?
  117. Yaqin mc 10L
  118. Can OTL Ciclotron amp use solid state regulated PS?
  119. Cross-channel overtalk with strange effects
  120. Why 6.3V?
  121. KT88 Williamson Design Questions
  122. Winding a center-tap secondary
  123. HV delay switch
  124. McIntosh MC-30...Balanced Input Feasible?
  125. Designing line driver / pre-amp
  126. Bucking and boosting a tube power transformer
  127. 33A-158M
  128. All DHT integrated amp
  129. 6N1P
  130. basic query - Pete Millett 807 board.
  131. Tube Tester with undocumented tubes
  132. "Fritz" the Boston/RI tube guy - ANYONE know what became of him??
  133. EI yugoslavia gone forever.
  134. Quicksilver 8417 Design - Stay with it or modify?
  135. Looking for some advice on odd preamp noise issue
  136. Tubes in an opamp feedback loop ?
  137. Jensen P-P Cathode Follower
  138. Cathode follower rigorous definition.
  139. Little Bear P3 ?!?! opinions ?
  140. NOS GU-81
  141. OPT endbell color!
  142. Music Angel kt88 with unbalanced output.. help me!
  143. Heater Supply Center Tap
  144. SCA-35 Pot noise
  145. Conrad Johnson MV 55
  146. Comments on 6C33C-B ARG OTL
  147. Construction tips for high voltage amps.
  148. 6L6 bias
  149. came across Mingda Tube king mono blocks
  150. a lot of noise
  151. El84 pp Amp problem
  152. Power on filament current surge question
  153. Its likely a repost but W/e
  154. Scored some 8236's....
  155. What causes valve to glow red inside ?
  156. Tubes and radioisotope decay
  157. PSUDII Question
  158. DIY Bias Buddy
  159. Recommend me a high power OPT
  160. Design Shorting Tubes?
  161. Microsoft Tube Amp and Speakers
  162. S5 K-16LS Tone Control - Help Please
  163. SEUL Circuit for PL519, has anyone here built this?
  164. Motorola three channel
  165. Your own builders book
  166. WE91A - high frequency roll off
  167. Dynaco MarkIII dimensions
  168. Leak TL12+ smoothing capacitors.
  169. Crate Palomino V8 potentiometer replacement
  170. Question about failing 6550 output
  171. Need help converting Ampex 960 R2R to a preamp...
  172. 5751 SPICE Model -- for Poddwatt II
  173. Configuring an Audio Transformer for 8 Ohmsuring
  174. OTL Blocking cap / RC filter
  175. What do you think..OP Tx
  176. Does anyone have GA399MA.pdf?
  177. New Amp Build, First Post
  178. Twisting HV leads
  179. Phono MC/MM Stage like Audio Space Reference Two RIAA Section
  180. Help with AVO MK IV Meter
  181. Why use a pentode?
  182. Filter choke temperature concerns
  183. Is my output transformer damaged?
  184. Parafeed without a cap
  185. Edcor Transformer Problems
  186. From The Daft Idea Department
  187. Do I need a resistor between plates? pic included.
  188. Tube preamp overheating characteristics?
  189. Valve amplifier sounds great
  190. volume pot hum at low and high volume
  191. Thank You
  192. Help Needed ;)
  193. Mullard EL-34: new vs vintage
  194. A new IC for monitoring tubes
  195. 6L6 transformer on EL84
  196. Output transformer design
  197. Tubes4HiFi preamp questions
  198. Newbie advice - Phono Preamp/1st electronics build
  199. Got a HeathKit, now what to do?
  200. 4P1L push pull amp with Lundahl zero global feedback
  201. 12AQ5 SE Amp Issue
  202. ISO a motorboat
  203. Tube characteristic - Originates from pre or power amp tubes?
  204. swapping console amps...
  205. swapping console amps...
  206. Hum issue in PAS Aikido
  207. Hammond Transformer Warranty
  208. 6CB5 in triode PP?
  209. Input capacitance when tube is not conducting
  210. What would you build with these output transformers?
  211. Need help with new tube for my amp
  212. Does the method for loading the plate affect gain of the stage?
  213. Slightly Sick Amplifier
  214. OP Tx for signal tubes in Headphone amps
  215. Listing of Radio Amateur/HAM Flea Markets In Europe
  216. need mac kit 30 transformer
  217. Is this transformer saturation? (pictures inside)
  218. Did I use the LR8 in this EF86 preamp correctly?
  219. Who recognizes the chassis of this amp
  220. Sweep tubes in Push-Pull-Parallel
  221. EZ125 Quad KT88 Project
  222. Need a help! OPT design assistant software
  223. Ready To Build the Other
  224. Harman Kardon Citation II
  225. Relays for tube voltages
  226. Okay, Can someone suggest if this PSU can work
  227. ELROG 211 and 845 tubes
  228. Has anyone tried this tube preamp
  229. filament choke testing
  230. Grounded-Grid MC Head Amp for 2x PC900 and Lyra Delos
  231. output transformer sizing - is there such a thing as to big?
  232. Advice for dummies...from a new to the forum dummy
  233. Counterpoint Tech
  234. Line Magnetic 211-IA: Schematic?
  235. Help with harmon kardon a50k
  236. anyone ID these Magnecord amplifiers?
  237. vintage vacuum audio site
  238. Hiraga preamp line+phono 4xECC81 SRPP
  239. Why no simple 2-stage EL34 PP amps?
  240. Dynaco MKIII mod
  241. Blown Up Sir...
  242. Leak stereo20
  243. FFT Hanning Data
  244. Elevated Filament Question
  245. what do you think about this lv linestage?
  246. PCM1798 ECC83/EL84 PP UL balanced combo
  247. I am Trying to Design this Darling Amplifier
  248. Real power pentode recommendation
  249. bridge with CT: can I do that?
  250. Who makes nice pc board for tubes ?

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