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  1. First post here, need some help with PSU for amplifier
  2. Novice build of 6EM7 circuit. PSU advice.
  3. All DHT single-ended 211 amp suggestion?
  4. Adding inputs to Melody SP3 mk2
  5. Repurpose vertical output autoformer?
  6. Power supply for tube preamp - Help!
  7. Good ECL84 / 6DX8 Tube - Correct Pentode Spice Model Needed!!!
  8. Assistance with 211 powerdrive type design
  9. Passive pre for kt88 push pull
  10. Current production tubes testing used/low out of the box?
  11. Safe to use bare (laquered) copper wire for heaters?
  12. power supply
  13. Power transformer question
  14. 10W+10W EL34+ECC83 single-ended Class A Stereo amplifier Kit wlx
  15. Testing Volume Controls
  16. Rowe R-4359A Amplifier
  17. Converting pentode to triode
  18. Nuvistor heater current inrush question
  19. Stereo Pre-amp build issues
  20. Triode 843
  21. 12ax7 preamp tube for jolida 1501BRC
  22. Volume pot for tube preamp
  23. I finally won my fight to kill the hum, but not clear why
  24. HK A500 phono issues
  25. Parallel Damper Tubes for Voltage Doubler
  26. Good schematic (circuit) with tube 12ax7
  27. Potientiameter
  28. HH Scott 299C tube integrated amp channel B music comes on after 15 mins to 20 mins?
  29. transformer wiring
  30. Looking for help with my Emotive Audio ETA Amplifier
  31. Running tubes' filament on DC
  32. 6.3V Rectifiers and winding sharing?
  33. Audio colume controls / atternuators
  34. Determining output transformer turn ratio and impedance
  35. GM70 build startup
  36. Yukon Gold - a spud amp
  37. 310A (328A) triode curves
  38. Can anybody identify the manufacturer of this pcf80
  39. Need advice on Quad 22 repair
  40. 2P1P Russian tetrode
  41. Bogen MO-100 increase PS capacitor
  42. Does O-netics make SE OPTs?
  43. 1939 Rockola amp
  44. Yet another Aikido? NOVAL vs OCTAL
  45. Why are tube amp wattages low
  46. Vintage kt88 pp mod suggestions
  47. Balanced Bridge mode?
  48. Little Bear P5-1
  49. 10M45 power diss. w/ 6EM7 (12mA)
  50. Hot chassis death traps
  51. Pwr Xfmr-less Tube Guitar Preamp
  52. Do we need this input resistor?
  53. Brimar thermionic products 2015
  54. 'Cheap' 2A3 P-P OPT
  55. Thoughts/?'s about gain stages and PI
  56. 300V & 12.6V regulated power supply.
  57. Remember the Ekco radios.
  58. Converting hybrid from ECC88 to 6N1P
  59. What is, --'Crosswalk'...?
  60. first time dyi help
  61. 500k potentiometer to 100k - okay?
  62. B&K 707 Chart for Russian Tubes
  63. rca transformer output
  64. Western Electric 300B tubes
  65. Interstage transformer crosswalk help
  66. DC coupled MOSFET drivers for output stage - simple questions
  67. 813 PP Audio Amp Help
  68. Bargain basement coupling caps
  69. TX 2575
  70. HK Citation II Negative Feedback question... how can I measure it?
  71. a little help with the aikido lv?
  72. Is it possible for a tube to not light up without any visual other indicators?
  73. Oversized OPTs
  74. How to calculate global NFB CAPACITOR. Is it needed?
  75. Simple driver for positive grid tubes
  76. Is this how to create a full wave rectifier?
  77. Surplus for tubes in NY and Miami
  78. Lux CL-35 tone control simulation issue
  79. Stereo SE in Parallel?
  80. 6AR6: A new tube to play with
  81. Time for another dumb question
  82. CBS 12AU7?
  83. SE UL 6V6 GT
  84. RCA output transformer part # 246860
  85. 801A Battery Bias
  86. Acoustat Servo Amps
  87. how to connect output transformers??
  88. Tube Amp Power transformer getting Hot...dumb question
  89. Where to get tubes for DCPP build?
  90. Pro and Cons to use 4 ohm tap for Global Feedback instead of 8 ohm tap
  91. Any quality Chinese tube amps?
  92. 6V6 Single Ended question
  93. C. Follower w/- active load
  94. Bias adjustment in Stereo Power Amp with 4 x EL34
  95. All Tube MC Phono Head Amp
  96. Marantz 7 Tube pre-amplifier PCB Board Design
  97. Miller capacitance
  98. Regarding pin 1 & pin 8 EL34
  99. Better place for noise to put the Global Feedback resistor
  100. Change 12AY7 to 12AX7 Tube. Waht new settings?
  101. Bogen MO-100: Series and blown power transformer
  102. Tung Sol Reissue 6550 Ratings/ Reliability
  103. How do I calculate shunt resistor value in a heater series string
  104. Mikael Abdellah KT88 tweak
  105. Replacing caps 50uf with 47UF
  106. Where can buy those earthing rods?
  107. 845 tube biasing strangly
  108. Which phono should I pick?
  109. Combination of Philips en Psvane tubes EL34
  110. 388A datasheet
  111. Build diary - Ciuffoli all triode OTL
  112. porta fi modification help please
  113. Help me ID 6SN7 GTB Baldwin
  114. Some help with output transformers induced hum
  115. VA rating needed for Single End Power Supply
  116. Improved Mullard circuit
  117. Evaluating Tube Diodes as Rectifiers
  118. Output Transformer Saturation, Impedance Load Curve...
  119. HK Citation II - strange issues
  120. Combination of PCB and point to point wiring a bad idea?
  121. Sound Valves M60 red plated badly please help?
  122. Old tube Radio Conversion
  123. I need something that will take place of a 5965
  124. Mu Follower Analysis
  125. Looking for advice on selling an expensive tube (WE 274A)
  126. 6EM7 SET Amplifier
  127. El84-6BQ5... NOT!!!! just a lookalike!
  128. How to modify the Little Bear P8 preamp to become an amp?
  129. Differential Shunt Cascode Driver
  130. GZ32 vs ss rectifier
  131. Where do I put the resistor?
  132. been laying low - revisiting a KT88 partial FB amp
  133. SET Rebuild (Fixed Bias and Rod Coleman DHT Regulators)
  134. ATTN Sy: Why gold grids 2
  135. "el escorpion" line stage, plus 10W B+ flyback supply & mute circuit
  136. Cathode Follower config for Tube DI
  137. Replacing capacitors in a VTL300 power amp
  138. how do I connect a plate amp for subwoofer to tube amp
  139. 6sn7 why the soft clipping.
  140. Yes we need Tone Controls! An outstanding project from 1962
  141. counterpoint sa4 otl
  142. Eico ST40 Kit
  143. Audio output transformer
  144. Thoughts on this schematic actually working.
  145. PSUD2 on Mac
  146. Two-section 500V electrolytic caps for cheap (new production)
  147. I am completely new to tubes.
  148. 2C50 Preamp Schematic
  149. Yet another RH84
  150. Example of Anode Follower (plate follower) with volume ctrl?
  151. Beginner DIY Amp
  152. EF86 Grid/anode triode question.
  153. Tube power supply
  154. Citation II... can't get enough bias!
  155. Auto Radio Tubes
  156. 4 edition valve amplifiers (in London)
  157. Need Help With Screen Switch
  158. Output transformer help
  159. When to use artificial center tap
  160. High end car project- looking for advice
  161. I hate wiring amps!
  162. Silicone tube rings
  163. Quad Audio Digital Potentiometer for Tube Preamp
  164. Looking for grounded grid preamp schematic that use only 12ax7/420a
  165. Someone, please check my plot.
  166. Selecting output transformer for OTL headphone amp
  167. RCA tube preamplifier help
  168. Flickering knocking sound on a push pull EL34 configuration.
  169. Tubes headphone amplifier
  170. Custom tube amplifier builders
  171. New to valve cheap pre-amp tweak help please?
  172. ARC SP-3A-1 Tube Opinions
  173. Has anyone tried a "12AU7 to 6SN7 Adapter"?
  174. 300b filament on pb accumulator
  175. 2K2M Tubes...any use?
  176. GK-71 SE or PP?
  177. Electrolytic capacitors high quality
  178. 6HV5 / CCS - driver project
  179. Getting 60W from 6C33C pushpull
  180. Phono Pre - Chassis layout
  181. Heyco strain relief pliers
  182. RH84 and Electron stream question.
  183. 845 amp.. Now I've got a faint hum..
  184. "Lisa trafo" transformer builder
  185. KT-90 odd behavior
  186. ecc99-2a3
  187. 6SJ7 gain setup
  188. Prototype for 2X 20 Triode
  189. 6n1p preamp schematic
  190. PSU Choke - Valve Phono Pre project
  191. LND150 gyrator for ECC83/12AX7 ???
  192. GU-48 Tube amplifier 833A
  193. OTL with custom 64ohm speakers... Idea in the making
  194. Snap, Crackle, Pop!
  195. What normally causes buzzing?
  196. 690R:8R output transformer
  197. Redplate and Other Questions
  198. Tube wisdom...
  199. 01B thoriated tungsten filaments?
  200. Distortion/Low Signal/Noise from Ampex 620 after being on for 5 minutes?
  201. Max Plate (Boost + DC Supply), what does it mean
  202. It's been a while since I've been here...
  203. Quicksilver Silver Mono Mods
  204. Chinese, Single-Ended, Class A, Questions.
  205. Balanced Aikido Hum
  206. Pentode Tone Control Module
  207. Reason for no output reading and blown tube
  208. Volume control for 24v Aikido pre
  209. First Tube Project
  210. Pentode or triode mode EL84 design suggestions
  211. Question about the need for OPTs for headphone amps
  212. Help with ne-2 lamp in my tube tester!!
  213. Looking for a SRPP Calculator
  214. Snubber at primary SE
  215. JJ ECC802 grid current
  216. Tube Regulator Current Limiting Resistor?
  217. What tube
  218. 6AH4 Preamp Help
  219. B&K 650 signal voltage cal
  220. Testing on latest PP 300B build
  221. Book - Audiophile Vacuum Tube Amplifiers -
  222. Fusion Postmodernism and push tube amps 6SN7 + 26 45
  223. 6GE5 Triode
  224. Any plans to build a 100W per channel power amp?
  225. voltage drops HELP
  226. 2in1 headphone amp
  227. DIY Tube Amp with phono
  228. active loading and point to point
  229. Which tubes are having biggest influence on sound (not power)?
  230. Using epoxy to add mechanical strength to solder joints
  231. Output Transformers in series
  232. Trying to ID maker of O/P Transformers from 'Fuji-Star' tuner
  233. Dynaco Gear or Marketing?
  234. Help me ID these tubes
  235. BOC amp BP-40-k schematic
  236. Bias Schematic
  237. Filtering of DC volts?
  238. Motorola Stereophonic
  239. Helping a newbie break the code...
  240. Additional help.
  241. Help with tube ID.
  242. First build! Heater supply question
  243. Reasonable derating for a power transformer ?
  244. Information wanted on an old amp
  245. Quick question about heater voltage
  246. ECC83 Phase Splitter Voltages
  247. Bias Probe Question
  248. Vintage parts to new amp
  249. Converting all unbalanced connections to balanced
  250. ACF-2 Build

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