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  1. How to select a good Hifi 12AX7 tube?
  2. LTP with CCS and negative PS
  3. Odd phase splitter
  4. Yet Another Hybrid Amplifier
  5. what Lundahl OPT for headphone 2A3 amp? (for HD800)
  6. Heater to Cathode voltage e88cc
  7. ASR-433
  8. Marantz 8B phase splitter
  9. Silvertone 1485 - Output Transformer advice
  10. Bob Latino ST120 Down
  11. SS phase splitters?
  12. Supply Filtering and why Capacitance Multipliers are NOT the Answer
  13. SE 6L6 to KT88
  14. HT power supply design
  15. Good tubes for concertina - 4P1L maybe?
  16. Powr supply question
  17. What is wrong with this Amplifier?
  18. Palmer DREI - Three SE Output Tubes Together?
  19. Heathkit TC-2 Checker and KT88s
  20. my Dummy Amp Contraption
  21. HF Oscillation Heat-Up Spk's Magnet!?
  22. Triode calculations
  23. Western Electric 131
  24. Electrolytic vs. Film 2A3 Cathode Bypass?
  25. Sylvania JAN 6SN7WGTA, late 1970's
  26. TV7 tester problem with 6CB5A tube
  27. Stromberg-Carlson AP-55
  28. SHUGUANG 2A3
  29. Circuit breaker help.
  30. Recommend me a bookshelf speaker for 5W
  31. Monarch STA 100X weird?
  32. 1954 US Army "Sound Repeater" amplifier
  33. 6N7...this configuration work ?
  34. RIAA Active EQ
  35. Direct Coupled E-Linear Amp
  36. Double Triode Mu
  37. Music Angel kt88 new pcbs problem
  38. EL503 replacement?
  39. Reducing gain in a SRPP circuit with ECC82?
  40. 12XX7 Triodes
  41. Output Tx just for interest
  42. Valab in Taiwan output transformers
  43. Impedance Question
  44. How to include a dual triode tube in a KiCAD schematic?
  45. 12U7 SPICE Model
  46. Phono Stage Woofer Bounce
  47. Problem with new L3-3 please help!
  48. Edcor output transformer...very nice !!!
  49. SE Hybrid Amp "The Lunatic one"
  50. Marantz 8b power transformer B+ down 30%
  51. Single or paralell trafo?
  52. CJ PV 5 Impedance?
  53. ECF80 driving EL84 PP
  54. Luhdahl LL1660S what current rating for D3a driver?
  55. what's that cap?
  56. SE EL84 Component placement Suggestion
  57. How to make a cheap 6N3 Buffer Amp even better?
  58. buying Tube Amps need advice/opinions
  59. Best driver and Power 6V6 By Officina
  60. dynaco pas3
  61. 5U4GB full-wave bridge, stumped
  62. Complete Module Driver and Power with DHT 6B4G
  63. HELP NEEDED for a 6CA4/EZ81 power supply
  64. OT for 2A3 PSE w/Parafeed
  65. More Dynaco Mark VI Questions
  66. curious feedback in circuit of Pioneer SM-Q300 receiver
  67. Hytron 2E25 - Other forgotten and marvelous tube !
  68. need tube upgrade advice please sir
  69. buyer beware
  70. Analog tube for DAC & Power supply with valve EZ_80
  71. JJ 5y3S pin 1??
  72. My first Sansui AU-111 Rebuild
  73. Capacitor-induced distortion
  74. Elevating Heater Voltage with multiple Transformer Heater Secondaries
  75. Common Cathode as DAC output
  76. Pre-Amp with russian tubes 1j24b
  77. How to calculate, the output impedance of a tube with grounded grid
  78. How To Draw Load Line With Output Transformer ?
  79. Inter electrode capacitance.
  80. My amp is an oscillator !
  81. TESLA PL509
  82. What value for Va ?
  83. Help selecting an input transformer ?
  84. Should same valves grid voltage vary much ?
  85. Driver options for 300B-XLS (4P1L-IS-4P1L-IS)
  86. Restoring a Scott 299-B
  87. Latest project, 80 watt valve amplifier
  88. PP Amp Doubling Output Power
  89. Setting up a Wilson current mirror as a differential load
  90. interested in tube amps
  91. Baldwin 45P amp project
  92. DIYGene's Jadis JP-200 Preamp Kit
  93. Need design/schematic for 6H30P driven 6C33C SET
  94. Substitute 6AQ8 for my 6CG7's
  95. 6bq5 tubes in a Heathkit AA-151
  96. Marantz 8b restoration: colour code, prints, schematics
  97. Show me your screen drive circuits
  98. Potting Compounds
  99. Chokes in the ground "plane"
  100. OTL idea
  101. Balance control tip for newbee's
  102. Ebay win - is this any good?
  103. 6sn7 pse amp for altec lansing 604E
  104. "Cockeyed Bridge" with damper diode?
  105. Mac 2100 Hybrid
  106. Single-Stage Hybrid Cascode Power Amp
  107. New to Tube amps, heathkit question
  108. 6AS7 OTL PL build
  109. On Bootstrapping diodes for UL G2 MOSFET
  110. Chasing Aikido "hum"
  111. valve monobloc designs
  112. 7A5 is a good driver for the 300B ?
  113. Parallel Push Pull 6V6 design
  114. Black cat caps?
  115. Soundstage
  116. Brains & Brawn CF : where's the catch ?
  117. ISO-TANGO to quit
  118. Shifting reflective loads using secondary taps?
  119. VTL -- 20 6550's a side and their xfmrs
  120. "Diamond" tube preamp with 12au7
  121. Wich factory made this tube ?
  122. Bootstrapped Cathode Coupled Amplifier
  123. OTL 6AS7
  124. Diode performance testing
  125. Monacor SA-10
  126. Volume Control Hum
  127. Stromberg-Carlson AP-50
  128. 5 wire and 3 wire output transformer change ?
  129. Yaqin mc 10L
  130. Can OTL Ciclotron amp use solid state regulated PS?
  131. Cross-channel overtalk with strange effects
  132. Why 6.3V?
  133. KT88 Williamson Design Questions
  134. Winding a center-tap secondary
  135. HV delay switch
  136. McIntosh MC-30...Balanced Input Feasible?
  137. Designing line driver / pre-amp
  138. Bucking and boosting a tube power transformer
  139. 33A-158M
  140. All DHT integrated amp
  141. 6N1P
  142. basic query - Pete Millett 807 board.
  143. Tube Tester with undocumented tubes
  144. "Fritz" the Boston/RI tube guy - ANYONE know what became of him??
  145. EI yugoslavia gone forever.
  146. Quicksilver 8417 Design - Stay with it or modify?
  147. Looking for some advice on odd preamp noise issue
  148. Tubes in an opamp feedback loop ?
  149. Jensen P-P Cathode Follower
  150. Cathode follower rigorous definition.
  151. Little Bear P3 ?!?! opinions ?
  152. NOS GU-81
  153. OPT endbell color!
  154. Music Angel kt88 with unbalanced output.. help me!
  155. Heater Supply Center Tap
  156. SCA-35 Pot noise
  157. Conrad Johnson MV 55
  158. Comments on 6C33C-B ARG OTL
  159. Construction tips for high voltage amps.
  160. 6L6 bias
  161. came across Mingda Tube king mono blocks
  162. a lot of noise
  163. El84 pp Amp problem
  164. Power on filament current surge question
  165. Its likely a repost but W/e
  166. Scored some 8236's....
  167. What causes valve to glow red inside ?
  168. Tubes and radioisotope decay
  169. PSUDII Question
  170. DIY Bias Buddy
  171. Recommend me a high power OPT
  172. Design Shorting Tubes?
  173. Microsoft Tube Amp and Speakers
  174. S5 K-16LS Tone Control - Help Please
  175. SEUL Circuit for PL519, has anyone here built this?
  176. Motorola three channel
  177. Your own builders book
  178. WE91A - high frequency roll off
  179. Dynaco MarkIII dimensions
  180. Leak TL12+ smoothing capacitors.
  181. Crate Palomino V8 potentiometer replacement
  182. Question about failing 6550 output
  183. Need help converting Ampex 960 R2R to a preamp...
  184. 5751 SPICE Model -- for Poddwatt II
  185. Configuring an Audio Transformer for 8 Ohmsuring
  186. OTL Blocking cap / RC filter
  187. What do you think..OP Tx
  188. Does anyone have GA399MA.pdf?
  189. New Amp Build, First Post
  190. Twisting HV leads
  191. Phono MC/MM Stage like Audio Space Reference Two RIAA Section
  192. Help with AVO MK IV Meter
  193. Why use a pentode?
  194. Filter choke temperature concerns
  195. Is my output transformer damaged?
  196. Parafeed without a cap
  197. Edcor Transformer Problems
  198. From The Daft Idea Department
  199. Do I need a resistor between plates? pic included.
  200. Tube preamp overheating characteristics?
  201. Valve amplifier sounds great
  202. volume pot hum at low and high volume
  203. Thank You
  204. Help Needed ;)
  205. Mullard EL-34: new vs vintage
  206. A new IC for monitoring tubes
  207. 6L6 transformer on EL84
  208. Output transformer design
  209. Tubes4HiFi preamp questions
  210. Newbie advice - Phono Preamp/1st electronics build
  211. Got a HeathKit, now what to do?
  212. 4P1L push pull amp with Lundahl zero global feedback
  213. 12AQ5 SE Amp Issue
  214. ISO a motorboat
  215. Tube characteristic - Originates from pre or power amp tubes?
  216. swapping console amps...
  217. swapping console amps...
  218. Hum issue in PAS Aikido
  219. Hammond Transformer Warranty
  220. 6CB5 in triode PP?
  221. Input capacitance when tube is not conducting
  222. What would you build with these output transformers?
  223. Need help with new tube for my amp
  224. Does the method for loading the plate affect gain of the stage?
  225. Slightly Sick Amplifier
  226. OP Tx for signal tubes in Headphone amps
  227. Listing of Radio Amateur/HAM Flea Markets In Europe
  228. need mac kit 30 transformer
  229. Is this transformer saturation? (pictures inside)
  230. Did I use the LR8 in this EF86 preamp correctly?
  231. Who recognizes the chassis of this amp
  232. Sweep tubes in Push-Pull-Parallel
  233. EZ125 Quad KT88 Project
  234. Need a help! OPT design assistant software
  235. Ready To Build the Other
  236. Harman Kardon Citation II
  237. Relays for tube voltages
  238. Okay, Can someone suggest if this PSU can work
  239. ELROG 211 and 845 tubes
  240. Has anyone tried this tube preamp
  241. filament choke testing
  242. Grounded-Grid MC Head Amp for 2x PC900 and Lyra Delos
  243. output transformer sizing - is there such a thing as to big?
  244. Advice for dummies...from a new to the forum dummy
  245. Counterpoint Tech
  246. Line Magnetic 211-IA: Schematic?
  247. Help with harmon kardon a50k
  248. anyone ID these Magnecord amplifiers?
  249. vintage vacuum audio site
  250. Hiraga preamp line+phono 4xECC81 SRPP

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