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  1. Have you tested if two coupling capacitors in parallel are better than one sonically?
  2. DHT filament circuits - best wirewound resistors?
  3. Dual Pentode as two seperate Pentodes.
  4. Double "C" core OPT question
  5. EL34 pentode to triode feedback
  6. Chinese 7308?
  7. DC coupled circuits
  8. Need a complete amp kit for newbie
  9. Making a tube amp
  10. Tube amp diode question
  11. Michaelson Chronos
  12. Preamp question
  13. 6SJ7 and 6SC7 not on roll chart
  14. Graaf GM20 6C33
  15. Does Ultra-Linear SE reduce harmonic distortion?
  16. How to use a 3 prong plug with a Dynaco MkIII?
  17. 6e5-6e6 tube-operating point-absolute maximum rating
  18. LIFePO4 battery cathode bias
  19. Audible Illusions Modulus 3A CD input resistor values
  20. diode going into a tube rectifier
  21. Insulation for component leads in point to point wiring
  22. Advices on first tube amp
  23. 300B Tube Shootout
  24. Unison reasearch Mystery One
  25. 4P10C or 4Π10C tube, any member familiar with?
  26. Largest decoupling cap (DC block on signal path)
  27. Control Grid Feedback (as opposed to Cathode FB) and Miller Capacitance
  28. 211 / 845 ccs?
  29. Eimac 35T any good for an amplifier?
  30. What speaker impedance for a 5 ohm amplifier
  31. Almarro A318B SET Amplifier Simple Modifications For Improved Performance?
  32. Hammond interstage
  33. Bias Arrangement
  34. question about connecting my tube amp to a receiver
  35. Pentode screen bypass capacitor
  36. MINGDA MC845 AA schematics
  37. Faulty Output Transformer
  38. The makings of a nice SEP amp from an audio oscillator?
  39. Audio pot with tap
  40. tube amp and jbl crossover connection
  41. SE EL84 high screen and plate
  42. Marantz 7 line stage with DAC
  43. help with Ecc82/12AU7 selection
  44. Kt88's and 6SN7's?
  45. KR T-1610: What can I do with it?
  46. Simple voltage regulator
  47. Schematic
  48. Determining primary output load resistance...
  49. Warning about chokes by Toroidy
  50. Looking af new 845
  51. 807 Amplifier build.....Help Wanted
  52. Solid state power supply for tube amplifier.
  53. Power Transformer Rating Mythology?
  54. Claus Byrith 4-30 - HELP !
  55. LR8 as CCS for small tube cathode follower?
  56. Tektronix 120-086 transformer
  57. 01A question
  58. Determining input impedance
  59. Plate to cathode feedback
  60. Quick question about EL84 PSE
  61. P-SET EL34
  62. 6v6 Preamp Explorations
  63. Monoblock kits for $500
  64. Wanted/Needed Vaic Valve / KR 52B etc.
  65. Measuring Rp on the bench
  66. Clarifying RIAA calculations
  67. Emissions Labs 5U4G use statements
  68. Help me pick my first tube kit/winter project (tube preamp)
  69. Please explain feedback to an ignoramus
  70. Op-Amp/Power tube integration
  71. 12b4a preamp project
  72. Pot to Stepping and ohmic value change
  73. McIntosh MC2000
  74. universal high-gain pre-amp useful ?
  75. 6AX5, the forgotten rectifier?
  76. High gain pentode LTP?
  77. question with heater wiring
  78. Ideas for an hi-fi mono amplifier (and preamplifier)
  79. humm and buzz
  80. ECC88 For LTP
  81. Polam / Telam tubes !
  82. Question about grid input signal voltage
  83. Douk EL34 Amp kit
  84. ID help Please Hammond Amp
  85. rolling ecc88 into a 6cg7 socket
  86. Article Wanted - "High Quality Amplifier with the 6AS7G" by McProud
  87. capacitors
  88. Need a little WE 597A help
  89. Need to find - Triode Va=500V, Mu=20
  90. The Pomato, A hybrid can amp
  91. audio research sp16 phono no rec
  92. Recovered smoother Caps (to use or not)
  93. Effect of raising and lowering B+
  94. Ideas for tube amp EL34/ECC83 single ended
  95. The HiFi show 2015 UK
  96. Coupling capacitors
  97. Brook 12A
  98. Importance of plate voltage on overall performance
  99. Help Precision Fidelity M-7 amp
  100. And so it begins...
  101. What is the cream of the crop for DIY tubes kits?
  102. Amplifier Build - Suggestions
  103. 26DQ5 curves pin out
  104. Toroidal Transformer Upgrade for S5 Electronics K-16LS Kit
  105. VR tube RF issues
  106. usb and 3.5 to same pre
  107. Gain changing on 6n3 tube buffer
  108. Kelvin Capacitors
  109. simple question about on off switch
  110. Engineers Amp chassis
  111. First tube amp design, what are my mistakes?
  112. US 6L6GC identification
  113. PL508 triode curves, help !!!
  114. Multiple gain stages without continually increasing B+
  115. Choke and Capacitor input filters on a same winding?
  116. Any advice value for Volume control if....
  117. For tube lovers-Henry Wolcott Amplifiers from JBL PL100
  118. Help translate stamp mark on russian tube
  119. UK Engineers Amp (my first project)
  120. 12AX7 Heater pin 9
  121. Help With Translating Schematic
  122. Do diodes in the power section produce heat?
  123. you gotta laugh......really!!
  124. Dynachord Echocord S65 needs capacitors
  125. why is dc coupled better ?
  126. ARC grounding question
  127. Littles modifications of Triode Dick's KT88 MonoBill Classic
  128. New 6BG6G Amp
  129. Aesthetix Rhea Power Supply voltages
  130. Newbie - Broken Valve amp help!!
  131. New Build - Geraldine SE Amp
  132. Michaelson&Austin save attempt
  133. LTspice model needed....6JN6
  134. Big distortion of tube amplifier at high frequencies
  135. Radio Tubes Classifieds
  136. Sad and Lonely 6X4 Rectifier
  137. The Wild, Weird, World of GNF
  138. My first tube amp is here!!!
  139. Retro nixie volume indicator
  140. how to connect my corrent output DAC to my preamp TUBE?
  141. Roberts 770x / Akai M8 Tube Amplifier Question
  142. Conrad Johnson MV50 adjustment?
  143. Hum in console preamp after power supply rebuild
  144. Electrohome console amp?
  145. input impedance of mullard 3-3 amplifier....
  146. 6X4 Tube Rectifier Bridge
  147. can I use a zener for cathode bias
  148. Dual 5V winding 5AR4
  149. el84 test jig circuit
  150. anyone use knife switches for input selection???
  151. suggestions wanted for otl design
  152. Converting a single ended amp to parafeed
  153. Online stores for ordering Hitachi Metglas cores?
  154. Box of old tubes
  155. tube preamp
  156. bypassing balance control on VTL Deluxe
  157. Allegro II power amplifier
  158. ECF80 rating
  159. 71a pp parallel
  160. Hammond transformer 1627SEA
  161. Final schematic of my SET amplifier (drilling the chassis of my ex Boyuu china amp)
  162. Building Tube Amp DVD from Australia
  163. Tube preamp
  164. Bigger amp building help
  165. Balanced tube RIAA Preamplifier - Idea Search
  166. One tube brighter/hotter than the others
  167. HMV 2001 1953 record player circuit
  168. D3a - diode between screen & plate (triode) ?
  169. Radiotron/Eli Duttman phono change C1 to .00391?
  170. Mating Martin logan summits with VTL 125s has been a challenge
  171. Learning to Build A Tube Amplifier
  172. how to determine if an output transformer has blown?
  173. Secondary Emission Tetrode
  174. Monster Transformer Has Arrived
  175. wiring tubes in series
  176. Rogers E20a/Audio Note transformer
  177. PCL86 Amplifier
  178. Beard BB100 P35 project
  179. 6p15p
  180. help with paul hynes reg
  181. Vinyl Savor 6CB5A SE Amps?
  182. PSU RC filter vs. VR regulator tube
  183. VTL Deluxe tube mystery
  184. My First SPUD Amp, 6EM7
  185. GK-71 SE amp
  186. 12ax7 Phono Preamplifier
  187. Aikido 6GM8 (ECC86) HPA or How I built a tube amp with non-scary voltages
  188. "Langham" Phase Inverter Origin?
  189. Adding "tube sound" via inline circuit
  190. Radford STA25 Renaissance - HELP!
  191. Capacitor across B+ and the input signal on the primary of the output transformer
  192. Zenith KPS-80 Rebuild
  193. 50+ watt diy tube amp recommedations
  194. Trouble with PSUD 2 high current / low voltage
  195. Magnavox 175 clone w/Fisher OPTs?
  196. First post here, need some help with PSU for amplifier
  197. Novice build of 6EM7 circuit. PSU advice.
  198. All DHT single-ended 211 amp suggestion?
  199. Adding inputs to Melody SP3 mk2
  200. Repurpose vertical output autoformer?
  201. Power supply for tube preamp - Help!
  202. Good ECL84 / 6DX8 Tube - Correct Pentode Spice Model Needed!!!
  203. Assistance with 211 powerdrive type design
  204. Passive pre for kt88 push pull
  205. Current production tubes testing used/low out of the box?
  206. Safe to use bare (laquered) copper wire for heaters?
  207. power supply
  208. Power transformer question
  209. 10W+10W EL34+ECC83 single-ended Class A Stereo amplifier Kit wlx
  210. Testing Volume Controls
  211. Rowe R-4359A Amplifier
  212. Converting pentode to triode
  213. Nuvistor heater current inrush question
  214. Stereo Pre-amp build issues
  215. Triode 843
  216. 12ax7 preamp tube for jolida 1501BRC
  217. Volume pot for tube preamp
  218. I finally won my fight to kill the hum, but not clear why
  219. HK A500 phono issues
  220. Parallel Damper Tubes for Voltage Doubler
  221. Good schematic (circuit) with tube 12ax7
  222. Potientiameter
  223. HH Scott 299C tube integrated amp channel B music comes on after 15 mins to 20 mins?
  224. transformer wiring
  225. Looking for help with my Emotive Audio ETA Amplifier
  226. Running tubes' filament on DC
  227. 6.3V Rectifiers and winding sharing?
  228. Audio colume controls / atternuators
  229. Determining output transformer turn ratio and impedance
  230. GM70 build startup
  231. Yukon Gold - a spud amp
  232. 310A (328A) triode curves
  233. Can anybody identify the manufacturer of this pcf80
  234. Need advice on Quad 22 repair
  235. 2P1P Russian tetrode
  236. Bogen MO-100 increase PS capacitor
  237. Does O-netics make SE OPTs?
  238. 1939 Rockola amp
  239. Yet another Aikido? NOVAL vs OCTAL
  240. Why are tube amp wattages low
  241. Vintage kt88 pp mod suggestions
  242. Balanced Bridge mode?
  243. Little Bear P5-1
  244. 10M45 power diss. w/ 6EM7 (12mA)
  245. Hot chassis death traps
  246. Do we need this input resistor?
  247. Brimar thermionic products 2015
  248. 'Cheap' 2A3 P-P OPT
  249. Thoughts/?'s about gain stages and PI
  250. 300V & 12.6V regulated power supply.

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