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  1. Determining output transformer turn ratio and impedance
  2. GM70 build startup
  3. Yukon Gold - a spud amp
  4. 310A (328A) triode curves
  5. Can anybody identify the manufacturer of this pcf80
  6. Need advice on Quad 22 repair
  7. 2P1P Russian tetrode
  8. Bogen MO-100 increase PS capacitor
  9. Does O-netics make SE OPTs?
  10. 1939 Rockola amp
  11. Yet another Aikido? NOVAL vs OCTAL
  12. Why are tube amp wattages low
  13. Vintage kt88 pp mod suggestions
  14. Balanced Bridge mode?
  15. Little Bear P5-1
  16. 10M45 power diss. w/ 6EM7 (12mA)
  17. Do we need this input resistor?
  18. Brimar thermionic products 2015
  19. 'Cheap' 2A3 P-P OPT
  20. Thoughts/?'s about gain stages and PI
  21. Remember the Ekco radios.
  22. Converting hybrid from ECC88 to 6N1P
  23. What is, --'Crosswalk'...?
  24. first time dyi help
  25. 500k potentiometer to 100k - okay?
  26. B&K 707 Chart for Russian Tubes
  27. rca transformer output
  28. Western Electric 300B tubes
  29. Interstage transformer crosswalk help
  30. DC coupled MOSFET drivers for output stage - simple questions
  31. 813 PP Audio Amp Help
  32. TX 2575
  33. HK Citation II Negative Feedback question... how can I measure it?
  34. a little help with the aikido lv?
  35. Is it possible for a tube to not light up without any visual other indicators?
  36. Oversized OPTs
  37. How to calculate global NFB CAPACITOR. Is it needed?
  38. Simple driver for positive grid tubes
  39. Surplus for tubes in NY and Miami
  40. Lux CL-35 tone control simulation issue
  41. Stereo SE in Parallel?
  42. 6AR6: A new tube to play with
  43. Time for another dumb question
  44. CBS 12AU7?
  45. SE UL 6V6 GT
  46. RCA output transformer part # 246860
  47. 801A Battery Bias
  48. Acoustat Servo Amps
  49. how to connect output transformers??
  50. Tube Amp Power transformer getting Hot...dumb question
  51. Where to get tubes for DCPP build?
  52. Pro and Cons to use 4 ohm tap for Global Feedback instead of 8 ohm tap
  53. Any quality Chinese tube amps?
  54. 6V6 Single Ended question
  55. C. Follower w/- active load
  56. Bias adjustment in Stereo Power Amp with 4 x EL34
  57. All Tube MC Phono Head Amp
  58. Marantz 7 Tube pre-amplifier PCB Board Design
  59. Miller capacitance
  60. Regarding pin 1 & pin 8 EL34
  61. Better place for noise to put the Global Feedback resistor
  62. Change 12AY7 to 12AX7 Tube. Waht new settings?
  63. Bogen MO-100: Series and blown power transformer
  64. Tung Sol Reissue 6550 Ratings/ Reliability
  65. How do I calculate shunt resistor value in a heater series string
  66. Mikael Abdellah KT88 tweak
  67. 845 tube biasing strangly
  68. Which phono should I pick?
  69. Combination of Philips en Psvane tubes EL34
  70. 388A datasheet
  71. Build diary - Ciuffoli all triode OTL
  72. porta fi modification help please
  73. Help me ID 6SN7 GTB Baldwin
  74. Some help with output transformers induced hum
  75. Improved Mullard circuit
  76. Output Transformer Saturation, Impedance Load Curve...
  77. HK Citation II - strange issues
  78. Combination of PCB and point to point wiring a bad idea?
  79. Sound Valves M60 red plated badly please help?
  80. Old tube Radio Conversion
  81. I need something that will take place of a 5965
  82. Mu Follower Analysis
  83. Looking for advice on selling an expensive tube (WE 274A)
  84. 6EM7 SET Amplifier
  85. El84-6BQ5... NOT!!!! just a lookalike!
  86. How to modify the Little Bear P8 preamp to become an amp?
  87. Differential Shunt Cascode Driver
  88. Where do I put the resistor?
  89. been laying low - revisiting a KT88 partial FB amp
  90. SET Rebuild (Fixed Bias and Rod Coleman DHT Regulators)
  91. ATTN Sy: Why gold grids 2
  92. "el escorpion" line stage, plus 10W B+ flyback supply & mute circuit
  93. Cathode Follower config for Tube DI
  94. Replacing capacitors in a VTL300 power amp
  95. how do I connect a plate amp for subwoofer to tube amp
  96. 6sn7 why the soft clipping.
  97. Yes we need Tone Controls! An outstanding project from 1962
  98. counterpoint sa4 otl
  99. Eico ST40 Kit
  100. Audio output transformer
  101. Thoughts on this schematic actually working.
  102. PSUD2 on Mac
  103. I am completely new to tubes.
  104. 2C50 Preamp Schematic
  105. Yet another RH84
  106. Example of Anode Follower (plate follower) with volume ctrl?
  107. Beginner DIY Amp
  108. EF86 Grid/anode triode question.
  109. Citation II... can't get enough bias!
  110. Auto Radio Tubes
  111. 4 edition valve amplifiers (in London)
  112. Need Help With Screen Switch
  113. Output transformer help
  114. High end car project- looking for advice
  115. I hate wiring amps!
  116. Silicone tube rings
  117. Quad Audio Digital Potentiometer for Tube Preamp
  118. Looking for grounded grid preamp schematic that use only 12ax7/420a
  119. Someone, please check my plot.
  120. Selecting output transformer for OTL headphone amp
  121. RCA tube preamplifier help
  122. Flickering knocking sound on a push pull EL34 configuration.
  123. Tubes headphone amplifier
  124. Custom tube amplifier builders
  125. New to valve cheap pre-amp tweak help please?
  126. ARC SP-3A-1 Tube Opinions
  127. Has anyone tried a "12AU7 to 6SN7 Adapter"?
  128. 300b filament on pb accumulator
  129. 2K2M Tubes...any use?
  130. GK-71 SE or PP?
  131. 6HV5 / CCS - driver project
  132. Getting 60W from 6C33C pushpull
  133. Phono Pre - Chassis layout
  134. Heyco strain relief pliers
  135. RH84 and Electron stream question.
  136. 845 amp.. Now I've got a faint hum..
  137. "Lisa trafo" transformer builder
  138. KT-90 odd behavior
  139. ecc99-2a3
  140. 6SJ7 gain setup
  141. Prototype for 2X 20 Triode
  142. 6n1p preamp schematic
  143. PSU Choke - Valve Phono Pre project
  144. LND150 gyrator for ECC83/12AX7 ???
  145. GU-48 Tube amplifier 833A
  146. OTL with custom 64ohm speakers... Idea in the making
  147. Snap, Crackle, Pop!
  148. What normally causes buzzing?
  149. 690R:8R output transformer
  150. Redplate and Other Questions
  151. Tube wisdom...
  152. 01B thoriated tungsten filaments?
  153. Distortion/Low Signal/Noise from Ampex 620 after being on for 5 minutes?
  154. Max Plate (Boost + DC Supply), what does it mean
  155. It's been a while since I've been here...
  156. Quicksilver Silver Mono Mods
  157. Chinese, Single-Ended, Class A, Questions.
  158. Balanced Aikido Hum
  159. Pentode Tone Control Module
  160. Reason for no output reading and blown tube
  161. Volume control for 24v Aikido pre
  162. First Tube Project
  163. Pentode or triode mode EL84 design suggestions
  164. Question about the need for OPTs for headphone amps
  165. Help with ne-2 lamp in my tube tester!!
  166. Looking for a SRPP Calculator
  167. Snubber at primary SE
  168. JJ ECC802 grid current
  169. Tube Regulator Current Limiting Resistor?
  170. What tube
  171. 6AH4 Preamp Help
  172. B&K 650 signal voltage cal
  173. Testing on latest PP 300B build
  174. Book - Audiophile Vacuum Tube Amplifiers -
  175. Fusion Postmodernism and push tube amps 6SN7 + 26 45
  176. 6GE5 Triode
  177. Any plans to build a 100W per channel power amp?
  178. voltage drops HELP
  179. 2in1 headphone amp
  180. DIY Tube Amp with phono
  181. active loading and point to point
  182. Which tubes are having biggest influence on sound (not power)?
  183. Using epoxy to add mechanical strength to solder joints
  184. Output Transformers in series
  185. Trying to ID maker of O/P Transformers from 'Fuji-Star' tuner
  186. Dynaco Gear or Marketing?
  187. Help me ID these tubes
  188. BOC amp BP-40-k schematic
  189. Bias Schematic
  190. Filtering of DC volts?
  191. Motorola Stereophonic
  192. Helping a newbie break the code...
  193. Additional help.
  194. Help with tube ID.
  195. First build! Heater supply question
  196. Reasonable derating for a power transformer ?
  197. Information wanted on an old amp
  198. Quick question about heater voltage
  199. ECC83 Phase Splitter Voltages
  200. Bias Probe Question
  201. Vintage parts to new amp
  202. Converting all unbalanced connections to balanced
  203. ACF-2 Build
  204. Frequency dependent power rating; OPT se
  205. 6L6 SE AMP
  206. Need to know some kind of found tubes
  207. Sansui 1000a opt max current question
  208. 12U7 - any users out there?
  209. 6GW8 Tube Test Data Needed
  210. 832A headphone amplifier
  211. Help with el84 valves
  212. Tube Preamp philips Mullard
  213. ecc99 2a3
  214. Chinese amp Oscillation
  215. tube regulators
  216. Storing spare tubes
  217. Best way to re-apply text to vintage amp chassis?
  218. B&K 747 troubleshooting
  219. Technical questions: understanding "El Cheapo Grande"
  220. Another Approach to Totem Pole OTL Amplifier
  221. Dynaco ST-70 vs.... ????
  222. Tube rectifiers also need snubber capacitors?
  223. HV regulator design - opinions?
  224. 4E27 / 8001 transmitting tube
  225. testing WE 420A / 5755
  226. String LEDs on long tail pair?
  227. SMPS Tube kit - Interested?
  228. tung-sol 7236
  229. PT Failed Winding
  230. ID for an AMprex something...
  231. Help with floating AC heaters (please)
  232. parallel secondaries, both with center taps
  233. Eico ST 40
  234. Opt primary impedance for audionote M10 phono pre
  235. Sansui AU-70 hum in one channel
  236. Pye HF25 Monoblocks
  237. Magnavox 6V6 circuit and output transformers.
  238. 13.8 volt smps for a kt120 SE amp???
  239. EL84 custom monoblocks
  240. Little Bear pre amp valuable find...
  241. ECL8? Is this the proper name of this tube?
  242. EL 502 / EL 511
  243. Used too weak diode, fuse blew.
  244. My first ever vacuum tube amplifier :)
  245. ATS25N -- Any use for audio ??
  246. Maggie 9300 Amp Problem
  247. Musicmaster 6AQ5A socket
  248. 6922 or 12AX7
  249. nobsound amp
  250. New project: pre and power mono, what to build?

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