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  1. How to calculate global NFB CAPACITOR. Is it needed?
  2. Simple driver for positive grid tubes
  3. Surplus for tubes in NY and Miami
  4. Lux CL-35 tone control simulation issue
  5. Stereo SE in Parallel?
  6. 6AR6: A new tube to play with
  7. Time for another dumb question
  8. CBS 12AU7?
  9. SE UL 6V6 GT
  10. RCA output transformer part # 246860
  11. 801A Battery Bias
  12. Acoustat Servo Amps
  13. how to connect output transformers??
  14. Tube Amp Power transformer getting Hot...dumb question
  15. Where to get tubes for DCPP build?
  16. Pro and Cons to use 4 ohm tap for Global Feedback instead of 8 ohm tap
  17. Any quality Chinese tube amps?
  18. 6V6 Single Ended question
  19. C. Follower w/- active load
  20. Bias adjustment in Stereo Power Amp with 4 x EL34
  21. All Tube MC Phono Head Amp
  22. Marantz 7 Tube pre-amplifier PCB Board Design
  23. Miller capacitance
  24. Regarding pin 1 & pin 8 EL34
  25. Better place for noise to put the Global Feedback resistor
  26. Change 12AY7 to 12AX7 Tube. Waht new settings?
  27. Bogen MO-100: Series and blown power transformer
  28. Tung Sol Reissue 6550 Ratings/ Reliability
  29. How do I calculate shunt resistor value in a heater series string
  30. Mikael Abdellah KT88 tweak
  31. 845 tube biasing strangly
  32. Which phono should I pick?
  33. Combination of Philips en Psvane tubes EL34
  34. 388A datasheet
  35. Build diary - Ciuffoli all triode OTL
  36. porta fi modification help please
  37. Help me ID 6SN7 GTB Baldwin
  38. Some help with output transformers induced hum
  39. Improved Mullard circuit
  40. Output Transformer Saturation, Impedance Load Curve...
  41. HK Citation II - strange issues
  42. Combination of PCB and point to point wiring a bad idea?
  43. Sound Valves M60 red plated badly please help?
  44. Old tube Radio Conversion
  45. I need something that will take place of a 5965
  46. Mu Follower Analysis
  47. Looking for advice on selling an expensive tube (WE 274A)
  48. 6EM7 SET Amplifier
  49. How to modify the Little Bear P8 preamp to become an amp?
  50. Differential Shunt Cascode Driver
  51. Where do I put the resistor?
  52. been laying low - revisiting a KT88 partial FB amp
  53. SET Rebuild (Fixed Bias and Rod Coleman DHT Regulators)
  54. ATTN Sy: Why gold grids 2
  55. "el escorpion" line stage, plus 10W B+ flyback supply & mute circuit
  56. Cathode Follower config for Tube DI
  57. Replacing capacitors in a VTL300 power amp
  58. how do I connect a plate amp for subwoofer to tube amp
  59. 6sn7 why the soft clipping.
  60. Yes we need Tone Controls! An outstanding project from 1962
  61. counterpoint sa4 otl
  62. Eico ST40 Kit
  63. Audio output transformer
  64. Thoughts on this schematic actually working.
  65. I am completely new to tubes.
  66. 2C50 Preamp Schematic
  67. Yet another RH84
  68. Example of Anode Follower (plate follower) with volume ctrl?
  69. Beginner DIY Amp
  70. EF86 Grid/anode triode question.
  71. Citation II... can't get enough bias!
  72. Auto Radio Tubes
  73. 4 edition valve amplifiers (in London)
  74. Need Help With Screen Switch
  75. Output transformer help
  76. High end car project- looking for advice
  77. Silicone tube rings
  78. Looking for grounded grid preamp schematic that use only 12ax7/420a
  79. Someone, please check my plot.
  80. Selecting output transformer for OTL headphone amp
  81. RCA tube preamplifier help
  82. Flickering knocking sound on a push pull EL34 configuration.
  83. Tubes headphone amplifier
  84. Custom tube amplifier builders
  85. New to valve cheap pre-amp tweak help please?
  86. ARC SP-3A-1 Tube Opinions
  87. Has anyone tried a "12AU7 to 6SN7 Adapter"?
  88. 300b filament on pb accumulator
  89. 2K2M Tubes...any use?
  90. GK-71 SE or PP?
  91. 6HV5 / CCS - driver project
  92. Getting 60W from 6C33C pushpull
  93. Phono Pre - Chassis layout
  94. RH84 and Electron stream question.
  95. 845 amp.. Now I've got a faint hum..
  96. "Lisa trafo" transformer builder
  97. KT-90 odd behavior
  98. ecc99-2a3
  99. 6SJ7 gain setup
  100. Prototype for 2X 20 Triode
  101. 6n1p preamp schematic
  102. PSU Choke - Valve Phono Pre project
  103. LND150 gyrator for ECC83/12AX7 ???
  104. GU-48 Tube amplifier 833A
  105. OTL with custom 64ohm speakers... Idea in the making
  106. Snap, Crackle, Pop!
  107. What normally causes buzzing?
  108. 690R:8R output transformer
  109. Redplate and Other Questions
  110. Tube wisdom...
  111. 01B thoriated tungsten filaments?
  112. Distortion/Low Signal/Noise from Ampex 620 after being on for 5 minutes?
  113. Max Plate (Boost + DC Supply), what does it mean
  114. It's been a while since I've been here...
  115. Quicksilver Silver Mono Mods
  116. Chinese, Single-Ended, Class A, Questions.
  117. Balanced Aikido Hum
  118. Pentode Tone Control Module
  119. Reason for no output reading and blown tube
  120. Volume control for 24v Aikido pre
  121. First Tube Project
  122. Pentode or triode mode EL84 design suggestions
  123. Question about the need for OPTs for headphone amps
  124. Looking for a SRPP Calculator
  125. Snubber at primary SE
  126. JJ ECC802 grid current
  127. Tube Regulator Current Limiting Resistor?
  128. What tube
  129. 6AH4 Preamp Help
  130. Testing on latest PP 300B build
  131. Book - Audiophile Vacuum Tube Amplifiers -
  132. Fusion Postmodernism and push tube amps 6SN7 + 26 45
  133. 6GE5 Triode
  134. Any plans to build a 100W per channel power amp?
  135. voltage drops HELP
  136. 2in1 headphone amp
  137. DIY Tube Amp with phono
  138. active loading and point to point
  139. Which tubes are having biggest influence on sound (not power)?
  140. Output Transformers in series
  141. Trying to ID maker of O/P Transformers from 'Fuji-Star' tuner
  142. Dynaco Gear or Marketing?
  143. Help me ID these tubes
  144. BOC amp BP-40-k schematic
  145. Bias Schematic
  146. Filtering of DC volts?
  147. Motorola Stereophonic
  148. Helping a newbie break the code...
  149. Additional help.
  150. Help with tube ID.
  151. First build! Heater supply question
  152. Reasonable derating for a power transformer ?
  153. Information wanted on an old amp
  154. Quick question about heater voltage
  155. ECC83 Phase Splitter Voltages
  156. Bias Probe Question
  157. Vintage parts to new amp
  158. Converting all unbalanced connections to balanced
  159. ACF-2 Build
  160. Frequency dependent power rating; OPT se
  161. 6L6 SE AMP
  162. Need to know some kind of found tubes
  163. Sansui 1000a opt max current question
  164. 12U7 - any users out there?
  165. 6GW8 Tube Test Data Needed
  166. 832A headphone amplifier
  167. Help with el84 valves
  168. Tube Preamp philips Mullard
  169. ecc99 2a3
  170. Chinese amp Oscillation
  171. tube regulators
  172. Storing spare tubes
  173. Best way to re-apply text to vintage amp chassis?
  174. Technical questions: understanding "El Cheapo Grande"
  175. Another Approach to Totem Pole OTL Amplifier
  176. Dynaco ST-70 vs.... ????
  177. Tube rectifiers also need snubber capacitors?
  178. HV regulator design - opinions?
  179. 4E27 / 8001 transmitting tube
  180. testing WE 420A / 5755
  181. String LEDs on long tail pair?
  182. SMPS Tube kit - Interested?
  183. tung-sol 7236
  184. PT Failed Winding
  185. ID for an AMprex something...
  186. Help with floating AC heaters (please)
  187. parallel secondaries, both with center taps
  188. Eico ST 40
  189. Opt primary impedance for audionote M10 phono pre
  190. Sansui AU-70 hum in one channel
  191. Pye HF25 Monoblocks
  192. Magnavox 6V6 circuit and output transformers.
  193. 13.8 volt smps for a kt120 SE amp???
  194. EL84 custom monoblocks
  195. Little Bear pre amp valuable find...
  196. ECL8? Is this the proper name of this tube?
  197. EL 502 / EL 511
  198. Used too weak diode, fuse blew.
  199. My first ever vacuum tube amplifier :)
  200. ATS25N -- Any use for audio ??
  201. Maggie 9300 Amp Problem
  202. Musicmaster 6AQ5A socket
  203. 6922 or 12AX7
  204. nobsound amp
  205. New project: pre and power mono, what to build?
  206. Radford bias: options for ultralinear output
  207. Class D Amplifier -- building blocks
  208. HT windings with no CT
  209. Dynaco st 70 resistor
  210. Older Conrad Johnson or new something else
  211. Power supply dummy load
  212. Micro-power, micro cost amp with Rod-Tubes, 1P24B-V
  213. A bit of fun with archaic converters
  214. DOUK 5670+6AQ5+6E2 push-pull merge Class AB tube amp HIFI amplifier DIY KIT
  215. Counterpoint SA-5.1 with dead channel
  216. need safety advise - speaker output ternimals
  217. Marantz 8B Replica Build
  218. Why Gold Grids
  219. "Shiny Eyes" PSE 300B
  220. PCB layout for Valves
  221. rogers cadet mkiii
  222. Direct-Coupled Tube (or Tube-MOSFET) Headphone Amp Circuit
  223. My GM70 amp...separating the input+driver from the output stage
  224. My Quad II and 22 restoration
  225. Help with an OTL CV3618 amp design
  226. stancore NOS power transformer Picture
  227. Choosing a tube amplifier to build, HELP needed
  228. FB circuit for a Maggie 175 with Edcor UL OT's
  229. Gary Lays it on the Line (Classic Output XFMRs)
  230. Info needed on adding subwoofer to tune amp
  231. Help me understand this 7189A SE tube amp?
  232. uTracer Users: Could you trace Western Electric 436A, 448A tubes ?
  233. Tube amp project for 4 ohm speakers
  234. Wouldn't equal plate V + screen V = triode mode?
  235. 866A, 3B25 LTSPICE models
  236. 6HB6 as finals
  237. Leak OP Transformer Mod - Assistance please
  238. strange noise from tube line amp
  239. 6a6 tube as power output in headphone amp
  240. Mullard 6-7 stereo valve amp rebuild
  241. tube regulator for B+
  242. Yet another HV regulator
  243. Opinions on Clamping a ring-of-two bias-block in cathode of EL84
  244. Odd stabilized HV power EF86 + EL84
  245. NL710, 6011
  246. Somebody can identify this tube?
  247. Bullet proof driver circuit
  248. Need Grounding Advice for my System
  249. Use the chassis as the heatsink - Need safety advise
  250. Kofi's Tetra Sans

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