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  1. HELP NEEDED for a 6CA4/EZ81 power supply
  2. OT for 2A3 PSE w/Parafeed
  3. More Dynaco Mark VI Questions
  4. curious feedback in circuit of Pioneer SM-Q300 receiver
  5. Hytron 2E25 - Other forgotten and marvelous tube !
  6. need tube upgrade advice please sir
  7. buyer beware
  8. JJ 5y3S pin 1??
  9. My first Sansui AU-111 Rebuild
  10. Capacitor-induced distortion
  11. Elevating Heater Voltage with multiple Transformer Heater Secondaries
  12. Common Cathode as DAC output
  13. Pre-Amp with russian tubes 1j24b
  14. How to calculate, the output impedance of a tube with grounded grid
  15. How To Draw Load Line With Output Transformer ?
  16. Inter electrode capacitance.
  17. My amp is an oscillator !
  18. TESLA PL509
  19. What value for Va ?
  20. Help selecting an input transformer ?
  21. Should same valves grid voltage vary much ?
  22. Driver options for 300B-XLS (4P1L-IS-4P1L-IS)
  23. Restoring a Scott 299-B
  24. Latest project, 80 watt valve amplifier
  25. PP Amp Doubling Output Power
  26. Setting up a Wilson current mirror as a differential load
  27. interested in tube amps
  28. Baldwin 45P amp project
  29. DIYGene's Jadis JP-200 Preamp Kit
  30. Need design/schematic for 6H30P driven 6C33C SET
  31. Substitute 6AQ8 for my 6CG7's
  32. 6bq5 tubes in a Heathkit AA-151
  33. Marantz 8b restoration: colour code, prints, schematics
  34. Show me your screen drive circuits
  35. Potting Compounds
  36. Chokes in the ground "plane"
  37. OTL idea
  38. Balance control tip for newbee's
  39. Ebay win - is this any good?
  40. 6sn7 pse amp for altec lansing 604E
  41. "Cockeyed Bridge" with damper diode?
  42. Mac 2100 Hybrid
  43. Single-Stage Hybrid Cascode Power Amp
  44. New to Tube amps, heathkit question
  45. 6AS7 OTL PL build
  46. On Bootstrapping diodes for UL G2 MOSFET
  47. Chasing Aikido "hum"
  48. valve monobloc designs
  49. 7A5 is a good driver for the 300B ?
  50. Parallel Push Pull 6V6 design
  51. Soundstage
  52. Brains & Brawn CF : where's the catch ?
  53. ISO-TANGO to quit
  54. Shifting reflective loads using secondary taps?
  55. VTL -- 20 6550's a side and their xfmrs
  56. "Diamond" tube preamp with 12au7
  57. Wich factory made this tube ?
  58. Bootstrapped Cathode Coupled Amplifier
  59. OTL 6AS7
  60. Diode performance testing
  61. Monacor SA-10
  62. Volume Control Hum
  63. Stromberg-Carlson AP-50
  64. 5 wire and 3 wire output transformer change ?
  65. Yaqin mc 10L
  66. Can OTL Ciclotron amp use solid state regulated PS?
  67. Cross-channel overtalk with strange effects
  68. Why 6.3V?
  69. KT88 Williamson Design Questions
  70. Winding a center-tap secondary
  71. HV delay switch
  72. McIntosh MC-30...Balanced Input Feasible?
  73. Designing line driver / pre-amp
  74. Bucking and boosting a tube power transformer
  75. 33A-158M
  76. All DHT integrated amp
  77. 6N1P
  78. basic query - Pete Millett 807 board.
  79. "Fritz" the Boston/RI tube guy - ANYONE know what became of him??
  80. EI yugoslavia gone forever.
  81. Quicksilver 8417 Design - Stay with it or modify?
  82. Looking for some advice on odd preamp noise issue
  83. Tubes in an opamp feedback loop ?
  84. Jensen P-P Cathode Follower
  85. Cathode follower rigorous definition.
  86. Little Bear P3 ?!?! opinions ?
  87. NOS GU-81
  88. OPT endbell color!
  89. Music Angel kt88 with unbalanced output.. help me!
  90. Heater Supply Center Tap
  91. SCA-35 Pot noise
  92. Conrad Johnson MV 55
  93. Comments on 6C33C-B ARG OTL
  94. Construction tips for high voltage amps.
  95. 6L6 bias
  96. came across Mingda Tube king mono blocks
  97. a lot of noise
  98. El84 pp Amp problem
  99. Power on filament current surge question
  100. Its likely a repost but W/e
  101. Scored some 8236's....
  102. What causes valve to glow red inside ?
  103. Tubes and radioisotope decay
  104. PSUDII Question
  105. DIY Bias Buddy
  106. Recommend me a high power OPT
  107. Design Shorting Tubes?
  108. Microsoft Tube Amp and Speakers
  109. S5 K-16LS Tone Control - Help Please
  110. SEUL Circuit for PL519, has anyone here built this?
  111. Motorola three channel
  112. Your own builders book
  113. WE91A - high frequency roll off
  114. Dynaco MarkIII dimensions
  115. Leak TL12+ smoothing capacitors.
  116. Question about failing 6550 output
  117. Need help converting Ampex 960 R2R to a preamp...
  118. 5751 SPICE Model -- for Poddwatt II
  119. Configuring an Audio Transformer for 8 Ohmsuring
  120. OTL Blocking cap / RC filter
  121. What do you think..OP Tx
  122. Does anyone have GA399MA.pdf?
  123. New Amp Build, First Post
  124. Twisting HV leads
  125. Phono MC/MM Stage like Audio Space Reference Two RIAA Section
  126. Why use a pentode?
  127. Filter choke temperature concerns
  128. Is my output transformer damaged?
  129. Parafeed without a cap
  130. Edcor Transformer Problems
  131. From The Daft Idea Department
  132. Do I need a resistor between plates? pic included.
  133. Tube preamp overheating characteristics?
  134. Valve amplifier sounds great
  135. volume pot hum at low and high volume
  136. Thank You
  137. Help Needed ;)
  138. Mullard EL-34: new vs vintage
  139. A new IC for monitoring tubes
  140. 6L6 transformer on EL84
  141. Output transformer design
  142. Tubes4HiFi preamp questions
  143. Newbie advice - Phono Preamp/1st electronics build
  144. Got a HeathKit, now what to do?
  145. 4P1L push pull amp with Lundahl zero global feedback
  146. 12AQ5 SE Amp Issue
  147. ISO a motorboat
  148. Tube characteristic - Originates from pre or power amp tubes?
  149. swapping console amps...
  150. swapping console amps...
  151. Hum issue in PAS Aikido
  152. Hammond Transformer Warranty
  153. 6CB5 in triode PP?
  154. Input capacitance when tube is not conducting
  155. What would you build with these output transformers?
  156. Need help with new tube for my amp
  157. Does the method for loading the plate affect gain of the stage?
  158. Slightly Sick Amplifier
  159. OP Tx for signal tubes in Headphone amps
  160. need mac kit 30 transformer
  161. Is this transformer saturation? (pictures inside)
  162. Did I use the LR8 in this EF86 preamp correctly?
  163. Who recognizes the chassis of this amp
  164. Sweep tubes in Push-Pull-Parallel
  165. EZ125 Quad KT88 Project
  166. Need a help! OPT design assistant software
  167. Ready To Build the Other
  168. Harman Kardon Citation II
  169. Relays for tube voltages
  170. Okay, Can someone suggest if this PSU can work
  171. ELROG 211 and 845 tubes
  172. Has anyone tried this tube preamp
  173. filament choke testing
  174. Grounded-Grid MC Head Amp for 2x PC900 and Lyra Delos
  175. output transformer sizing - is there such a thing as to big?
  176. Advice for dummies...from a new to the forum dummy
  177. Counterpoint Tech
  178. Line Magnetic 211-IA: Schematic?
  179. Help with harmon kardon a50k
  180. anyone ID these Magnecord amplifiers?
  181. vintage vacuum audio site
  182. Hiraga preamp line+phono 4xECC81 SRPP
  183. Why no simple 2-stage EL34 PP amps?
  184. Dynaco MKIII mod
  185. Blown Up Sir...
  186. Leak stereo20
  187. FFT Hanning Data
  188. Elevated Filament Question
  189. what do you think about this lv linestage?
  190. PCM1798 ECC83/EL84 PP UL balanced combo
  191. I am Trying to Design this Darling Amplifier
  192. Real power pentode recommendation
  193. bridge with CT: can I do that?
  194. Who makes nice pc board for tubes ?
  195. pse300B
  196. 1948 Wireless World - 50 Watt Amp
  197. Akido preamp suggestions.
  198. 6CM5 MKII
  199. DC coupled 6P15P
  200. Switchable 45/VT-52 Amp
  201. Optransformer for 6B4G?
  202. OLSON TUBE AMP AM-158
  203. 6922 preamp idea
  204. Tube SPDIF output
  205. One power tube going hot at idle
  206. schematic to learn by
  207. Audioromy schematic
  208. 8236's
  209. Need a 4060 model on LTSpice
  210. vt86pp 6v6
  211. SALAS hv with 150V
  212. Aikido 12Vac
  213. Looking for expertise in adjusting Williamson amp
  214. Help with elevating a heater supply
  215. Preamp EQ
  216. Need help identifying this amp
  217. Phillips FX737A Rectifier
  218. wiring a transformer on a Scott 299
  219. DC/DC stepup for valve projects
  220. 807 SE Amp
  221. Stromberg Carlson ASR 220C blowing fuse
  222. EF806 pentode + CCS
  223. Transformer Identification
  224. Heathkit AA 121 parts
  225. Conrad Johnson PV-8: how to convert 110v to 220v
  226. Help me understand Edcor wiring?
  227. Another paralleled to single push-pull EL84 mod.
  228. Sca35 tone controls
  229. Tube preamp noise
  230. Fountek Tube Amp
  231. Choke & Transformer Positioning Problem
  232. The adventure time tube amp- Did any catch it?
  233. Input wiring question
  234. Let's talk triode-pentode
  235. Tried failed, looking for suggestions
  236. Need HELP converting Bogen MX30a pa into a preamp for recording
  237. Edcor Wrong Transformer...
  238. 812A Build
  239. Still not sure where to start
  240. Will cooling fan extend life of old caps & transformers? Or just make worse w dust?
  241. RCA tube amp woes/hum/ground
  242. EF86 microphony
  243. John Broskie Kits
  244. Refurbish Conrad Johnson Premier Eight
  245. 4tube Philco amp project...
  246. Thoughts on bias for PPP
  247. 2012's Acquired Parts- ..Custom Build Anyone?
  248. Can I use a variable voltage cieling fan switch as a variac?
  249. Audio research LS2 hiss and hum... need help
  250. saba electro sound

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