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  1. 1954 US Army "Sound Repeater" amplifier
  2. 6N7...this configuration work ?
  3. RIAA Active EQ
  4. Direct Coupled E-Linear Amp
  5. Double Triode Mu
  6. Music Angel kt88 new pcbs problem
  7. EL503 replacement?
  8. Reducing gain in a SRPP circuit with ECC82?
  9. 12XX7 Triodes
  10. Output Tx just for interest
  11. Valab in Taiwan output transformers
  12. Impedance Question
  13. How to include a dual triode tube in a KiCAD schematic?
  14. 12U7 SPICE Model
  15. Phono Stage Woofer Bounce
  16. Problem with new L3-3 please help!
  17. Edcor output transformer...very nice !!!
  18. SE Hybrid Amp "The Lunatic one"
  19. Marantz 8b power transformer B+ down 30%
  20. Single or paralell trafo?
  21. CJ PV 5 Impedance?
  22. ECF80 driving EL84 PP
  23. Luhdahl LL1660S what current rating for D3a driver?
  24. what's that cap?
  25. SE EL84 Component placement Suggestion
  26. How to make a cheap 6N3 Buffer Amp even better?
  27. buying Tube Amps need advice/opinions
  28. Best driver and Power 6V6 By Officina
  29. dynaco pas3
  30. 5U4GB full-wave bridge, stumped
  31. Complete Module Driver and Power with DHT 6B4G
  32. HELP NEEDED for a 6CA4/EZ81 power supply
  33. OT for 2A3 PSE w/Parafeed
  34. More Dynaco Mark VI Questions
  35. curious feedback in circuit of Pioneer SM-Q300 receiver
  36. Hytron 2E25 - Other forgotten and marvelous tube !
  37. need tube upgrade advice please sir
  38. buyer beware
  39. Analog tube for DAC & Power supply with valve EZ_80
  40. JJ 5y3S pin 1??
  41. My first Sansui AU-111 Rebuild
  42. Capacitor-induced distortion
  43. Elevating Heater Voltage with multiple Transformer Heater Secondaries
  44. Common Cathode as DAC output
  45. Pre-Amp with russian tubes 1j24b
  46. How to calculate, the output impedance of a tube with grounded grid
  47. How To Draw Load Line With Output Transformer ?
  48. Inter electrode capacitance.
  49. My amp is an oscillator !
  50. TESLA PL509
  51. What value for Va ?
  52. Help selecting an input transformer ?
  53. Should same valves grid voltage vary much ?
  54. Driver options for 300B-XLS (4P1L-IS-4P1L-IS)
  55. Restoring a Scott 299-B
  56. Latest project, 80 watt valve amplifier
  57. PP Amp Doubling Output Power
  58. Setting up a Wilson current mirror as a differential load
  59. interested in tube amps
  60. Baldwin 45P amp project
  61. DIYGene's Jadis JP-200 Preamp Kit
  62. Need design/schematic for 6H30P driven 6C33C SET
  63. Substitute 6AQ8 for my 6CG7's
  64. 6bq5 tubes in a Heathkit AA-151
  65. Marantz 8b restoration: colour code, prints, schematics
  66. Show me your screen drive circuits
  67. Potting Compounds
  68. Chokes in the ground "plane"
  69. OTL idea
  70. Balance control tip for newbee's
  71. Ebay win - is this any good?
  72. 6sn7 pse amp for altec lansing 604E
  73. "Cockeyed Bridge" with damper diode?
  74. Mac 2100 Hybrid
  75. Single-Stage Hybrid Cascode Power Amp
  76. New to Tube amps, heathkit question
  77. 6AS7 OTL PL build
  78. On Bootstrapping diodes for UL G2 MOSFET
  79. Chasing Aikido "hum"
  80. valve monobloc designs
  81. 7A5 is a good driver for the 300B ?
  82. Parallel Push Pull 6V6 design
  83. Black cat caps?
  84. Soundstage
  85. Brains & Brawn CF : where's the catch ?
  86. ISO-TANGO to quit
  87. Shifting reflective loads using secondary taps?
  88. VTL -- 20 6550's a side and their xfmrs
  89. "Diamond" tube preamp with 12au7
  90. Wich factory made this tube ?
  91. Bootstrapped Cathode Coupled Amplifier
  92. OTL 6AS7
  93. Diode performance testing
  94. Monacor SA-10
  95. Volume Control Hum
  96. Stromberg-Carlson AP-50
  97. 5 wire and 3 wire output transformer change ?
  98. Yaqin mc 10L
  99. Can OTL Ciclotron amp use solid state regulated PS?
  100. Cross-channel overtalk with strange effects
  101. Why 6.3V?
  102. KT88 Williamson Design Questions
  103. Winding a center-tap secondary
  104. HV delay switch
  105. McIntosh MC-30...Balanced Input Feasible?
  106. Designing line driver / pre-amp
  107. Bucking and boosting a tube power transformer
  108. 33A-158M
  109. All DHT integrated amp
  110. 6N1P
  111. basic query - Pete Millett 807 board.
  112. Tube Tester with undocumented tubes
  113. "Fritz" the Boston/RI tube guy - ANYONE know what became of him??
  114. EI yugoslavia gone forever.
  115. Quicksilver 8417 Design - Stay with it or modify?
  116. Looking for some advice on odd preamp noise issue
  117. Tubes in an opamp feedback loop ?
  118. Jensen P-P Cathode Follower
  119. Cathode follower rigorous definition.
  120. Little Bear P3 ?!?! opinions ?
  121. NOS GU-81
  122. OPT endbell color!
  123. Music Angel kt88 with unbalanced output.. help me!
  124. Heater Supply Center Tap
  125. SCA-35 Pot noise
  126. Conrad Johnson MV 55
  127. Comments on 6C33C-B ARG OTL
  128. Construction tips for high voltage amps.
  129. 6L6 bias
  130. came across Mingda Tube king mono blocks
  131. a lot of noise
  132. El84 pp Amp problem
  133. Power on filament current surge question
  134. Its likely a repost but W/e
  135. Scored some 8236's....
  136. What causes valve to glow red inside ?
  137. Tubes and radioisotope decay
  138. PSUDII Question
  139. DIY Bias Buddy
  140. Recommend me a high power OPT
  141. Design Shorting Tubes?
  142. Microsoft Tube Amp and Speakers
  143. S5 K-16LS Tone Control - Help Please
  144. SEUL Circuit for PL519, has anyone here built this?
  145. Motorola three channel
  146. Your own builders book
  147. WE91A - high frequency roll off
  148. Dynaco MarkIII dimensions
  149. Leak TL12+ smoothing capacitors.
  150. Crate Palomino V8 potentiometer replacement
  151. Question about failing 6550 output
  152. Need help converting Ampex 960 R2R to a preamp...
  153. 5751 SPICE Model -- for Poddwatt II
  154. Configuring an Audio Transformer for 8 Ohmsuring
  155. OTL Blocking cap / RC filter
  156. What do you think..OP Tx
  157. Does anyone have GA399MA.pdf?
  158. New Amp Build, First Post
  159. Twisting HV leads
  160. Phono MC/MM Stage like Audio Space Reference Two RIAA Section
  161. Help with AVO MK IV Meter
  162. Why use a pentode?
  163. Filter choke temperature concerns
  164. Is my output transformer damaged?
  165. Parafeed without a cap
  166. Edcor Transformer Problems
  167. From The Daft Idea Department
  168. Do I need a resistor between plates? pic included.
  169. Tube preamp overheating characteristics?
  170. Valve amplifier sounds great
  171. volume pot hum at low and high volume
  172. Thank You
  173. Help Needed ;)
  174. Mullard EL-34: new vs vintage
  175. A new IC for monitoring tubes
  176. 6L6 transformer on EL84
  177. Output transformer design
  178. Tubes4HiFi preamp questions
  179. Newbie advice - Phono Preamp/1st electronics build
  180. Got a HeathKit, now what to do?
  181. 4P1L push pull amp with Lundahl zero global feedback
  182. 12AQ5 SE Amp Issue
  183. ISO a motorboat
  184. Tube characteristic - Originates from pre or power amp tubes?
  185. swapping console amps...
  186. swapping console amps...
  187. Hum issue in PAS Aikido
  188. Hammond Transformer Warranty
  189. 6CB5 in triode PP?
  190. Input capacitance when tube is not conducting
  191. What would you build with these output transformers?
  192. Need help with new tube for my amp
  193. Does the method for loading the plate affect gain of the stage?
  194. Slightly Sick Amplifier
  195. OP Tx for signal tubes in Headphone amps
  196. Listing of Radio Amateur/HAM Flea Markets In Europe
  197. need mac kit 30 transformer
  198. Is this transformer saturation? (pictures inside)
  199. Did I use the LR8 in this EF86 preamp correctly?
  200. Who recognizes the chassis of this amp
  201. Sweep tubes in Push-Pull-Parallel
  202. EZ125 Quad KT88 Project
  203. Need a help! OPT design assistant software
  204. Ready To Build the Other
  205. Harman Kardon Citation II
  206. Relays for tube voltages
  207. Okay, Can someone suggest if this PSU can work
  208. ELROG 211 and 845 tubes
  209. Has anyone tried this tube preamp
  210. filament choke testing
  211. Grounded-Grid MC Head Amp for 2x PC900 and Lyra Delos
  212. output transformer sizing - is there such a thing as to big?
  213. Advice for dummies...from a new to the forum dummy
  214. Counterpoint Tech
  215. Line Magnetic 211-IA: Schematic?
  216. Help with harmon kardon a50k
  217. anyone ID these Magnecord amplifiers?
  218. vintage vacuum audio site
  219. Hiraga preamp line+phono 4xECC81 SRPP
  220. Why no simple 2-stage EL34 PP amps?
  221. Dynaco MKIII mod
  222. Blown Up Sir...
  223. Leak stereo20
  224. FFT Hanning Data
  225. Elevated Filament Question
  226. what do you think about this lv linestage?
  227. PCM1798 ECC83/EL84 PP UL balanced combo
  228. I am Trying to Design this Darling Amplifier
  229. Real power pentode recommendation
  230. bridge with CT: can I do that?
  231. Who makes nice pc board for tubes ?
  232. pse300B
  233. 1948 Wireless World - 50 Watt Amp
  234. Akido preamp suggestions.
  235. 6CM5 MKII
  236. DC coupled 6P15P
  237. Switchable 45/VT-52 Amp
  238. Optransformer for 6B4G?
  239. OLSON TUBE AMP AM-158
  240. 6922 preamp idea
  241. Tube SPDIF output
  242. One power tube going hot at idle
  243. schematic to learn by
  244. Audioromy schematic
  245. 8236's
  246. Need a 4060 model on LTSpice
  247. vt86pp 6v6
  248. SALAS hv with 150V
  249. Fender Tweed Champ Kits/Parts
  250. Aikido 12Vac

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