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  1. First tube amp design, what are my mistakes?
  2. US 6L6GC identification
  3. PL508 triode curves, help !!!
  4. Multiple gain stages without continually increasing B+
  5. Choke and Capacitor input filters on a same winding?
  6. Any advice value for Volume control if....
  7. For tube lovers-Henry Wolcott Amplifiers from JBL PL100
  8. Help translate stamp mark on russian tube
  9. UK Engineers Amp (my first project)
  10. 12AX7 Heater pin 9
  11. Help With Translating Schematic
  12. Do diodes in the power section produce heat?
  13. you gotta laugh......really!!
  14. why is dc coupled better ?
  15. ARC grounding question
  16. Littles modifications of Triode Dick's KT88 MonoBill Classic
  17. New 6BG6G Amp
  18. Aesthetix Rhea Power Supply voltages
  19. Newbie - Broken Valve amp help!!
  20. New Build - Geraldine SE Amp
  21. Michaelson & Austin save attempt
  22. LTspice model needed....6JN6
  23. Big distortion of tube amplifier at high frequencies
  24. Radio Tubes Classifieds
  25. Sad and Lonely 6X4 Rectifier
  26. The Wild, Weird, World of GNF
  27. My first tube amp is here!!!
  28. Retro nixie volume indicator
  29. how to connect my corrent output DAC to my preamp TUBE?
  30. Roberts 770x / Akai M8 Tube Amplifier Question
  31. Conrad Johnson MV50 adjustment?
  32. Hum in console preamp after power supply rebuild
  33. Electrohome console amp?
  34. input impedance of mullard 3-3 amplifier....
  35. 6X4 Tube Rectifier Bridge
  36. can I use a zener for cathode bias
  37. Dual 5V winding 5AR4
  38. el84 test jig circuit
  39. suggestions wanted for otl design
  40. Converting a single ended amp to parafeed
  41. Online stores for ordering Hitachi Metglas cores?
  42. Box of old tubes
  43. tube preamp
  44. bypassing balance control on VTL Deluxe
  45. Allegro II power amplifier
  46. ECF80 rating
  47. 71a pp parallel
  48. Hammond transformer 1627SEA
  49. Final schematic of my SET amplifier (drilling the chassis of my ex Boyuu china amp)
  50. Building Tube Amp DVD from Australia
  51. Tube preamp
  52. Bigger amp building help
  53. Balanced tube RIAA Preamplifier - Idea Search
  54. One tube brighter/hotter than the others
  55. HMV 2001 1953 record player circuit
  56. D3a - diode between screen & plate (triode) ?
  57. Radiotron/Eli Duttman phono change C1 to .00391?
  58. Mating Martin logan summits with VTL 125s has been a challenge
  59. Learning to Build A Tube Amplifier
  60. how to determine if an output transformer has blown?
  61. Secondary Emission Tetrode
  62. Monster Transformer Has Arrived
  63. wiring tubes in series
  64. Rogers E20a/Audio Note transformer
  65. PCL86 Amplifier
  66. Beard BB100 P35 project
  67. 6p15p
  68. help with paul hynes reg
  69. Vinyl Savor 6CB5A SE Amps?
  70. VTL Deluxe tube mystery
  71. My First SPUD Amp, 6EM7
  72. GK-71 SE amp
  73. 12ax7 Phono Preamplifier
  74. Aikido 6GM8 (ECC86) HPA or How I built a tube amp with non-scary voltages
  75. "Langham" Phase Inverter Origin?
  76. Adding "tube sound" via inline circuit
  77. Radford STA25 Renaissance - HELP!
  78. Capacitor across B+ and the input signal on the primary of the output transformer
  79. Zenith KPS-80 Rebuild
  80. 50+ watt diy tube amp recommedations
  81. Trouble with PSUD 2 high current / low voltage
  82. Magnavox 175 clone w/Fisher OPTs?
  83. First post here, need some help with PSU for amplifier
  84. Novice build of 6EM7 circuit. PSU advice.
  85. All DHT single-ended 211 amp suggestion?
  86. Adding inputs to Melody SP3 mk2
  87. Repurpose vertical output autoformer?
  88. Good ECL84 / 6DX8 Tube - Correct Pentode Spice Model Needed!!!
  89. Assistance with 211 powerdrive type design
  90. Passive pre for kt88 push pull
  91. Current production tubes testing used/low out of the box?
  92. Safe to use bare (laquered) copper wire for heaters?
  93. 10W+10W EL34+ECC83 single-ended Class A Stereo amplifier Kit wlx
  94. Testing Volume Controls
  95. Rowe R-4359A Amplifier
  96. Converting pentode to triode
  97. Nuvistor heater current inrush question
  98. Stereo Pre-amp build issues
  99. Triode 843
  100. 12ax7 preamp tube for jolida 1501BRC
  101. Volume pot for tube preamp
  102. I finally won my fight to kill the hum, but not clear why
  103. HK A500 phono issues
  104. Parallel Damper Tubes for Voltage Doubler
  105. Good schematic (circuit) with tube 12ax7
  106. Potientiameter
  107. HH Scott 299C tube integrated amp channel B music comes on after 15 mins to 20 mins?
  108. transformer wiring
  109. Looking for help with my Emotive Audio ETA Amplifier
  110. Running tubes' filament on DC
  111. 6.3V Rectifiers and winding sharing?
  112. Audio colume controls / atternuators
  113. Determining output transformer turn ratio and impedance
  114. GM70 build startup
  115. Yukon Gold - a spud amp
  116. 310A (328A) triode curves
  117. Can anybody identify the manufacturer of this pcf80
  118. Need advice on Quad 22 repair
  119. 2P1P Russian tetrode
  120. Bogen MO-100 increase PS capacitor
  121. Does O-netics make SE OPTs?
  122. 1939 Rockola amp
  123. Yet another Aikido? NOVAL vs OCTAL
  124. Why are tube amp wattages low
  125. Vintage kt88 pp mod suggestions
  126. Balanced Bridge mode?
  127. Little Bear P5-1
  128. 10M45 power diss. w/ 6EM7 (12mA)
  129. Do we need this input resistor?
  130. Brimar thermionic products 2015
  131. 'Cheap' 2A3 P-P OPT
  132. Thoughts/?'s about gain stages and PI
  133. Remember the Ekco radios.
  134. Converting hybrid from ECC88 to 6N1P
  135. What is, --'Crosswalk'...?
  136. first time dyi help
  137. 500k potentiometer to 100k - okay?
  138. B&K 707 Chart for Russian Tubes
  139. rca transformer output
  140. Western Electric 300B tubes
  141. Interstage transformer crosswalk help
  142. DC coupled MOSFET drivers for output stage - simple questions
  143. 813 PP Audio Amp Help
  144. TX 2575
  145. HK Citation II Negative Feedback question... how can I measure it?
  146. a little help with the Aikido lV?
  147. Is it possible for a tube to not light up without any visual other indicators?
  148. Oversized OPTs
  149. How to calculate global NFB CAPACITOR. Is it needed?
  150. Simple driver for positive grid tubes
  151. Surplus for tubes in NY and Miami
  152. Lux CL-35 tone control simulation issue
  153. Stereo SE in Parallel?
  154. 6AR6: A new tube to play with
  155. Time for another dumb question
  156. CBS 12AU7?
  157. SE UL 6V6 GT
  158. RCA output transformer part # 246860
  159. 801A Battery Bias
  160. Acoustat Servo Amps
  161. how to connect output transformers??
  162. Tube Amp Power transformer getting Hot...dumb question
  163. Where to get tubes for DCPP build?
  164. Pro and Cons to use 4 ohm tap for Global Feedback instead of 8 ohm tap
  165. Any quality Chinese tube amps?
  166. 6V6 Single Ended question
  167. C. Follower w/- active load
  168. Bias adjustment in Stereo Power Amp with 4 x EL34
  169. All Tube MC Phono Head Amp
  170. Marantz 7 Tube pre-amplifier PCB Board Design
  171. Miller capacitance
  172. Regarding pin 1 & pin 8 EL34
  173. Better place for noise to put the Global Feedback resistor
  174. Change 12AY7 to 12AX7 Tube. Waht new settings?
  175. Bogen MO-100: Series and blown power transformer
  176. Tung Sol Reissue 6550 Ratings/ Reliability
  177. How do I calculate shunt resistor value in a heater series string
  178. Mikael Abdellah KT88 tweak
  179. 845 tube biasing strangly
  180. Which phono should I pick?
  181. Combination of Philips en Psvane tubes EL34
  182. 388A datasheet
  183. Build diary - Ciuffoli all triode OTL
  184. porta fi modification help please
  185. Help me ID 6SN7 GTB Baldwin
  186. Some help with output transformers induced hum
  187. Improved Mullard circuit
  188. Output Transformer Saturation, Impedance Load Curve...
  189. HK Citation II - strange issues
  190. Combination of PCB and point to point wiring a bad idea?
  191. Sound Valves M60 red plated badly please help?
  192. Old tube Radio Conversion
  193. I need something that will take place of a 5965
  194. Mu Follower Analysis
  195. Looking for advice on selling an expensive tube (WE 274A)
  196. 6EM7 SET Amplifier
  197. How to modify the Little Bear P8 preamp to become an amp?
  198. Differential Shunt Cascode Driver
  199. Where do I put the resistor?
  200. been laying low - revisiting a KT88 partial FB amp
  201. SET Rebuild (Fixed Bias and Rod Coleman DHT Regulators)
  202. ATTN Sy: Why gold grids 2
  203. "el escorpion" line stage, plus 10W B+ flyback supply & mute circuit
  204. Cathode Follower config for Tube DI
  205. Replacing capacitors in a VTL300 power amp
  206. how do I connect a plate amp for subwoofer to tube amp
  207. 6sn7 why the soft clipping.
  208. Yes we need Tone Controls! An outstanding project from 1962
  209. counterpoint sa4 otl
  210. Eico ST40 Kit
  211. Audio output transformer
  212. Thoughts on this schematic actually working.
  213. I am completely new to tubes.
  214. 2C50 Preamp Schematic
  215. Yet another RH84
  216. Example of Anode Follower (plate follower) with volume ctrl?
  217. Beginner DIY Amp
  218. EF86 Grid/anode triode question.
  219. Citation II... can't get enough bias!
  220. Auto Radio Tubes
  221. 4 edition valve amplifiers (in London)
  222. Need Help With Screen Switch
  223. Output transformer help
  224. High end car project- looking for advice
  225. Silicone tube rings
  226. Looking for grounded grid preamp schematic that use only 12ax7/420a
  227. Someone, please check my plot.
  228. Selecting output transformer for OTL headphone amp
  229. RCA tube preamplifier help
  230. Flickering knocking sound on a push pull EL34 configuration.
  231. Tubes headphone amplifier
  232. Custom tube amplifier builders
  233. New to valve cheap pre-amp tweak help please?
  234. ARC SP-3A-1 Tube Opinions
  235. Has anyone tried a "12AU7 to 6SN7 Adapter"?
  236. 300b filament on pb accumulator
  237. 2K2M Tubes...any use?
  238. GK-71 SE or PP?
  239. 6HV5 / CCS - driver project
  240. Getting 60W from 6C33C pushpull
  241. Phono Pre - Chassis layout
  242. RH84 and Electron stream question.
  243. 845 amp.. Now I've got a faint hum..
  244. "Lisa trafo" transformer builder
  245. KT-90 odd behavior
  246. ecc99-2a3
  247. 6SJ7 gain setup
  248. Prototype for 2X 20 Triode
  249. 6n1p preamp schematic
  250. PSU Choke - Valve Phono Pre project

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