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  1. Allen model 75 organ amplifiers modifications
  2. Capacitance of rectifier tubes/valves near V=0??
  3. Volume/selector switch
  4. Auto Bias w/ LM317
  5. Volume drops and then comes back - anyone recognizes the sympthom?
  6. Cathode Follower and Volume Pot
  7. Dyna Mark III monoblocks. Driver boards and some questions on modding.
  8. switching a 5y3 for a 5y4?
  9. K-12M in Ultra Linear Mode Volume Issue
  10. SA 260 Pilot tube amplifier
  11. Standard Earmax Mod
  12. 470V using Bridge vs. 230V using Doubler
  13. Troublesome hybrid shengya a10..
  14. Heater Dropping Resistors
  15. Useing Mosfet in cathode leg of phase splitter
  16. Cleaning old tube sockets with common household products
  17. Automatic Bias Kit
  18. Triode mode Pentode G2 resistor?
  19. Rectifier.
  20. Tube gainstage for newbie
  21. Source follower irf720 or DN2540
  22. Toroidal OPT
  23. Tesla E83CC - Have done research & still havingt trouble spotting fakes from real
  24. SE Power amp SG2 voltage
  25. Bias supply
  26. 7377 tube socket
  27. Power Transformer Impedance Matching
  28. zenith console amplifier (a stereo mono amplifier :) )
  29. Trutone model Teeco 610-D
  30. electromagnetic hum problem
  31. Heathkit A7 Volume.
  32. Ribbon Tube Amp
  33. Brimar ECC83 with red bottom
  34. Dynaco ST 35 Cheap Transformers source in EU
  35. Transformer input for P-P
  36. Help Identifying 12au7a From Hammond Organ
  37. K502 Bleeder and LED
  38. Cathode follower attenuates signal
  39. Anyone has a curve tracer to trace Western Electric 436A 448A 418A in triode mode ?
  40. Breadboards and tube voltages
  41. Dynaco 35 Power Supply
  42. Magic eye with tube em80-schematic or circuit
  43. Using 220v amp in country with 230v
  44. Magic eye with EM81 tube - made in China
  45. Improvement Suggestion Wanted: 6AS7 Hybrid PP Amp
  46. Tube amp instability in LTSpice (Claus Byrith 4-30)
  47. Current mfg triode's
  48. K12g upgrades
  49. Help Needed Identifying a Custom Tube Amp
  50. 6dj8 6922 driver question
  51. APPJ PA0901A Repair
  52. Output tube G1 resistors question
  53. Building Mullard PP ECL86 stereo
  54. 6SN7 Parallel Preamp Anyone?
  55. Advice on Finishing my K502 Build
  56. Ferrite SE Outut XFMR for HF Tube Amp
  57. Question about grounding a 2-prong tube amp
  58. Grommes Mono Block
  59. EL84 triode mode @ 425V?
  60. Hybrid amp - Grounding Suggestions?
  61. Advises asked for, exquisite taste wanted!!
  62. need a good 2a3 socket... need advice
  63. Cathode feedback comments?
  64. Does different Rectifier Tubes change the tone????
  65. Another boring day
  66. el84 Tube amp
  67. Haddon PL151 Quad II input transformer
  68. Noob question
  69. Futterman H3 Set Up
  70. Any tube guys here use a MiniDSP
  71. Should Output Transformers be replaced
  72. Quad II questions
  73. MY OTL Tim Mellow-ESL 63 PROJECT
  74. Zobel for REDD47 w/ HA-100 Inpu
  75. Pentode P-P - cathode biasing for A and AB
  76. Why a Headphone Amp?
  77. How little B+ ripple do I really need?
  78. Need good EF86 based RIAA preamp.
  79. Which Tube amplifier should I build first?
  80. 6L6GC in Push Pull Class A - how much power out?
  81. ECC83 DC Heater Supply - without CT
  82. PPP EL84 monoblocs: i knew then what i know now...
  83. zener, voltage devider or 02A
  84. DHT heater current draw - how fast?
  85. Rca sa752
  86. Audio Research and Octal Pre's
  87. Scott 299D
  88. Unison Smart 845 big problem
  89. Need help with driver idea for 845 amp - have a few ideas
  90. Input impedance on cathode follower stage?
  91. Picked up a box of tubes for $5.. What tubes are usable?
  92. A Raven preamp (mk2) finished
  93. need help searching for ground
  94. Pre-amp transformer output
  95. Boyuu EL34 A9 Tube Amp
  96. Hybrid 15W, want feedback - work in-progress
  97. SP12 and PH12 Pre and Phono from Vacuum Tube Audio
  98. Which tube amp for Telefunken-tlx3 loudspeakers?
  99. Burned up a tube - want to be sure I know why
  100. Output Transformer Windings in parallel
  101. New tube tech from Korg
  102. Got some PX4 valves from an old radiogram
  103. At the start: Triodedick´s Monobill Classic KT88 Monos
  104. Recommended HT current limit for old stock power transformers
  105. preamp circuit
  106. Low impedance headphone amp
  107. "Earthing" in DIY tube preamps
  108. Tube amp help
  109. How to draw a dynamic load line for cathode bypass triode like 12AX7
  110. Common Grid design
  111. 6AW8-A
  112. Push pull amp without GNFB
  113. No filament voltage
  114. Selecting Component Values for Simple Current-Feedback Amplifier
  115. 4 Blown Soft Recovery Diodes...Are TV Damper Tubes more Reliable?
  116. Just got a nice EL84 based receiver
  117. Is there any good current Production 6550s?
  118. Building the Damn Good 300B
  119. convert trashed kolster k20 into tube amp?
  120. Junkbox Hero
  121. KT150 curves by Sofia
  122. My new EL84 Amp
  123. parallel el84 output pp. shared coupling caps?
  124. Will a Western Electric 422A substitute for a 5Y3?
  125. Question for a moderator
  126. bottlehead quickie schematic
  127. RCA 6146B sub for 807 or 6L6?
  128. Leak monoblock hum
  129. Eico 2036
  130. Heathkit iT-12 signal tracer to much gain??
  131. Valve Monoblocks - am I being realistic?
  132. Aikido Headphone Amp and PS1 Power supply
  133. Transforming a triode into a pentode?
  134. New to amps - Long-tail pair and heater hum
  135. Experimenting with the Aikido 12Vac kit
  136. Strategies for Implementing Negative Feedback in a 12ax7 Line Amplifier
  137. Output Transformer Impedances
  138. PP 6l6 class ab...advice needed
  139. 300B
  140. 12AX7 EL34B TUBE AMPLIFIER
  141. UK info please
  142. PAS 2/3 RIAA Modification
  143. My Homage to the Earmax Headphone Amp
  144. Aikio Line Stage
  145. Love those triodes
  146. Differential Pair with negative feedback
  147. Quad II Eighty Schematic?
  148. Adventures with Aikido
  149. Beard BB 100 and Beard A35
  150. Noob is about to press the BIN button and buy a Chinese tube amp kit. Save me/ help?
  151. Ebay Kit EL34 6n9P 5Z3P Build Thread.
  152. Sakuma 46 / 801A Circuit
  153. Tube Manufacturing at Expo-Pul
  154. Philips EL6410, how does it sound?
  155. tube amp power help
  156. Video from the Czech Tesla Tube factory
  157. Alan0354's Rantings
  158. 3 x 3 Tube amp 30 watts
  159. Maximum allowed capacitance after gas rectifiers
  160. PSUD2 rectifiers list
  161. EL34 amplifier with these transformers
  162. Aikido Octal Dual Mono for Dummies... Help me.
  163. Monster Trans or Really Good Doorstop?
  164. The correct way to wire DC filaments 3B7 DHT
  165. Haller Circuit Problems
  166. Need recommendation for VERY basic amp project
  167. Recommendation on tube buffer?
  168. For Your Consideration: Unity Coupled Plitron Amp, No Bootstrapped Driver, No GNF
  169. Tango Transformers - any unique push pull circuits?
  170. newbe at designing tube amp
  171. Trouble shooting vintage Harman Kardon A250
  172. Coating on Hammond Power Transformer
  173. Small tube amp for PC
  174. CCS dissipation
  175. 6SL7 - grid stopper values
  176. HELP - Laying out footprint for 9 pin tube socket
  177. Telefunken Magnetophon 104 - Keep or strip?
  178. Transformer rewinding or repair needed.
  179. Sun Audio in the USA?
  180. Wyetech Opal 6SN7 tube preamp, any DIY kit sound even close?
  181. Praise for the 6N6G
  182. DHT equivalent to 12AT7?
  183. BIAS Consonance M800SE
  184. SE ECC83 - EL 84 - EZ 81 - 1964 !
  185. Name That Design!!
  186. Distortion expected in SE DC coupled 26/45 amp
  187. One Channel is Louder than the other on my Tube Phono Pre
  188. Need a Zobel Network (or RC shunt) in tube amplifier?
  189. Aikido 12VAC Help needed
  190. Novarria TU-30 output transformer
  191. Question on Schematic
  192. CJ PV-10A
  193. Mcintosh C2200 ReCap
  194. simple tube amp for music
  195. SE Parafeed Signal Return ?
  196. RCA VC274
  197. Heathkit w5
  198. tube rectifier for 1000v AC
  199. Tone Control Intercept Point on TU 8200
  200. Help with transformer and power switch wiring
  201. Mullard 5-20 iron
  202. Hard data on HP928
  203. Glassware Audio
  204. 5U4G problem
  205. Schematic för mono el84 SE wanted
  206. qualtek power module
  207. Low Static Hum Issue
  208. Look over my whacko schematic?
  209. PSU inrush current
  210. Heathkit A7 Output transformer
  211. THose lovely triodes
  212. Just picked up a shoebox of tubes from Craigslist
  213. Lower the primary impedance of the OPT to reduce distortion?
  214. Parallel/Series heater question
  215. Jay's Cheaterpants Hong Kong Marantz 7 Clone Build-Along
  216. Unused half of dual triode in low gain input stage in mono blocks?
  217. 12AL8 PP Amp Low Volume - Is this all or i can get more?
  218. Power supply resistors
  219. Aikido Headphone amplifier
  220. preamp
  221. How to turn Salvaged Parts into Projects..
  222. Output polarity?
  223. Help with this circuit
  224. Doing silly stuff for fun
  225. Modern Mullard head scratching
  226. Leben cs660p un identified component
  227. KT88 or 6L6 High-mu triode curves
  228. Edcor 240V primary 50hz humming
  229. Aikido quesion
  230. Why 6L6 is not more popular as power tube?
  231. 304TL SET schematic redesign. EML-20b Alternative?
  232. Question about Mullard EL84 Aplication note
  233. Magnavox tuner preamp 570111
  234. Tube amps on E-Bay
  235. Input, Output and Transfer Capacitance Question
  236. K502 Mods
  237. filament supply rectifier
  238. Triode as Voltage-Controled Dynamic Resistance in Compressor/Limiter
  239. RHSpud: Novice build
  240. 2A3 Amp - Not Another One...
  241. 12b4a pp
  242. replacing ECC82 with ECC99
  243. 2A3 input sensitivity
  244. Amp for JBL 2447 driver?
  245. Rare Philips 12ax7 Code Need Help
  246. Two quick questions on 35W4
  247. To convert Novar pins for Magnovale pins
  248. Mingda mc7r late design tweaking
  249. PSU for KT-90 PPP
  250. Noisy amp

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