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  1. Pentode screen bypass capacitor
  2. MINGDA MC845 AA schematics
  3. Faulty Output Transformer
  4. The makings of a nice SEP amp from an audio oscillator?
  5. Audio pot with tap
  6. tube amp and jbl crossover connection
  7. SE EL84 high screen and plate
  8. Marantz 7 line stage with DAC
  9. help with Ecc82/12AU7 selection
  10. Kt88's and 6SN7's?
  11. KR T-1610: What can I do with it?
  12. Schematic
  13. Determining primary output load resistance...
  14. Warning about chokes by Toroidy
  15. Looking af new 845
  16. 807 Amplifier build.....Help Wanted
  17. Claus Byrith 4-30 - HELP !
  18. LR8 as CCS for small tube cathode follower?
  19. Tektronix 120-086 transformer
  20. 01A question
  21. Determining input impedance
  22. Plate to cathode feedback
  23. Quick question about EL84 PSE
  24. P-SET EL34
  25. 6v6 Preamp Explorations
  26. Monoblock kits for $500
  27. Wanted/Needed Vaic Valve / KR 52B etc.
  28. Measuring Rp on the bench
  29. Clarifying RIAA calculations
  30. Emissions Labs 5U4G use statements
  31. Help me pick my first tube kit/winter project (tube preamp)
  32. Please explain feedback to an ignoramus
  33. Op-Amp/Power tube integration
  34. 12b4a preamp project
  35. Pot to Stepping and ohmic value change
  36. McIntosh MC2000
  37. universal high-gain pre-amp useful ?
  38. 6AX5, the forgotten rectifier?
  39. High gain pentode LTP?
  40. question with heater wiring
  41. Ideas for an hi-fi mono amplifier (and preamplifier)
  42. humm and buzz
  43. ECC88 For LTP
  44. Polam / Telam tubes !
  45. Question about grid input signal voltage
  46. Douk EL34 Amp kit
  47. ID help Please Hammond Amp
  48. rolling ecc88 into a 6cg7 socket
  49. Article Wanted - "High Quality Amplifier with the 6AS7G" by McProud
  50. capacitors
  51. Need a little WE 597A help
  52. Need to find - Triode Va=500V, Mu=20
  53. The Pomato, A hybrid can amp
  54. audio research sp16 phono no rec
  55. Recovered smoother Caps (to use or not)
  56. Effect of raising and lowering B+
  57. Ideas for tube amp EL34/ECC83 single ended
  58. The HiFi show 2015 UK
  59. Coupling capacitors
  60. Brook 12A
  61. Importance of plate voltage on overall performance
  62. Help Precision Fidelity M-7 amp
  63. And so it begins...
  64. What is the cream of the crop for DIY tubes kits?
  65. Amplifier Build - Suggestions
  66. 26DQ5 curves pin out
  67. Toroidal Transformer Upgrade for S5 Electronics K-16LS Kit
  68. VR tube RF issues
  69. usb and 3.5 to same pre
  70. Gain changing on 6n3 tube buffer
  71. Kelvin Capacitors
  72. simple question about on off switch
  73. Engineers Amp chassis
  74. First tube amp design, what are my mistakes?
  75. US 6L6GC identification
  76. PL508 triode curves, help !!!
  77. Multiple gain stages without continually increasing B+
  78. Choke and Capacitor input filters on a same winding?
  79. Any advice value for Volume control if....
  80. For tube lovers-Henry Wolcott Amplifiers from JBL PL100
  81. Help translate stamp mark on russian tube
  82. UK Engineers Amp (my first project)
  83. 12AX7 Heater pin 9
  84. Help With Translating Schematic
  85. Do diodes in the power section produce heat?
  86. you gotta laugh......really!!
  87. Dynachord Echocord S65 needs capacitors
  88. why is dc coupled better ?
  89. ARC grounding question
  90. Littles modifications of Triode Dick's KT88 MonoBill Classic
  91. New 6BG6G Amp
  92. Aesthetix Rhea Power Supply voltages
  93. Newbie - Broken Valve amp help!!
  94. New Build - Geraldine SE Amp
  95. Michaelson&Austin save attempt
  96. LTspice model needed....6JN6
  97. Big distortion of tube amplifier at high frequencies
  98. Radio Tubes Classifieds
  99. Sad and Lonely 6X4 Rectifier
  100. The Wild, Weird, World of GNF
  101. My first tube amp is here!!!
  102. Retro nixie volume indicator
  103. how to connect my corrent output DAC to my preamp TUBE?
  104. Roberts 770x / Akai M8 Tube Amplifier Question
  105. Conrad Johnson MV50 adjustment?
  106. Hum in console preamp after power supply rebuild
  107. Electrohome console amp?
  108. input impedance of mullard 3-3 amplifier....
  109. 6X4 Tube Rectifier Bridge
  110. can I use a zener for cathode bias
  111. Dual 5V winding 5AR4
  112. el84 test jig circuit
  113. anyone use knife switches for input selection???
  114. suggestions wanted for otl design
  115. Converting a single ended amp to parafeed
  116. Online stores for ordering Hitachi Metglas cores?
  117. Box of old tubes
  118. tube preamp
  119. bypassing balance control on VTL Deluxe
  120. Allegro II power amplifier
  121. ECF80 rating
  122. 71a pp parallel
  123. Hammond transformer 1627SEA
  124. Final schematic of my SET amplifier (drilling the chassis of my ex Boyuu china amp)
  125. Building Tube Amp DVD from Australia
  126. Tube preamp
  127. Bigger amp building help
  128. Balanced tube RIAA Preamplifier - Idea Search
  129. One tube brighter/hotter than the others
  130. HMV 2001 1953 record player circuit
  131. D3a - diode between screen & plate (triode) ?
  132. Radiotron/Eli Duttman phono change C1 to .00391?
  133. Mating Martin logan summits with VTL 125s has been a challenge
  134. Learning to Build A Tube Amplifier
  135. how to determine if an output transformer has blown?
  136. Secondary Emission Tetrode
  137. Monster Transformer Has Arrived
  138. wiring tubes in series
  139. Rogers E20a/Audio Note transformer
  140. PCL86 Amplifier
  141. Beard BB100 P35 project
  142. 6p15p
  143. help with paul hynes reg
  144. Vinyl Savor 6CB5A SE Amps?
  145. VTL Deluxe tube mystery
  146. My First SPUD Amp, 6EM7
  147. GK-71 SE amp
  148. 12ax7 Phono Preamplifier
  149. Aikido 6GM8 (ECC86) HPA or How I built a tube amp with non-scary voltages
  150. "Langham" Phase Inverter Origin?
  151. Adding "tube sound" via inline circuit
  152. Radford STA25 Renaissance - HELP!
  153. Capacitor across B+ and the input signal on the primary of the output transformer
  154. Zenith KPS-80 Rebuild
  155. 50+ watt diy tube amp recommedations
  156. Trouble with PSUD 2 high current / low voltage
  157. Magnavox 175 clone w/Fisher OPTs?
  158. First post here, need some help with PSU for amplifier
  159. Novice build of 6EM7 circuit. PSU advice.
  160. All DHT single-ended 211 amp suggestion?
  161. Adding inputs to Melody SP3 mk2
  162. Repurpose vertical output autoformer?
  163. Good ECL84 / 6DX8 Tube - Correct Pentode Spice Model Needed!!!
  164. Assistance with 211 powerdrive type design
  165. Passive pre for kt88 push pull
  166. Current production tubes testing used/low out of the box?
  167. Safe to use bare (laquered) copper wire for heaters?
  168. 10W+10W EL34+ECC83 single-ended Class A Stereo amplifier Kit wlx
  169. Testing Volume Controls
  170. Rowe R-4359A Amplifier
  171. Converting pentode to triode
  172. Nuvistor heater current inrush question
  173. Stereo Pre-amp build issues
  174. Triode 843
  175. 12ax7 preamp tube for jolida 1501BRC
  176. Volume pot for tube preamp
  177. I finally won my fight to kill the hum, but not clear why
  178. HK A500 phono issues
  179. Parallel Damper Tubes for Voltage Doubler
  180. Good schematic (circuit) with tube 12ax7
  181. Potientiameter
  182. HH Scott 299C tube integrated amp channel B music comes on after 15 mins to 20 mins?
  183. transformer wiring
  184. Looking for help with my Emotive Audio ETA Amplifier
  185. Running tubes' filament on DC
  186. 6.3V Rectifiers and winding sharing?
  187. Audio colume controls / atternuators
  188. Determining output transformer turn ratio and impedance
  189. GM70 build startup
  190. Yukon Gold - a spud amp
  191. 310A (328A) triode curves
  192. Can anybody identify the manufacturer of this pcf80
  193. Need advice on Quad 22 repair
  194. 2P1P Russian tetrode
  195. Bogen MO-100 increase PS capacitor
  196. Does O-netics make SE OPTs?
  197. 1939 Rockola amp
  198. Yet another Aikido? NOVAL vs OCTAL
  199. Why are tube amp wattages low
  200. Vintage kt88 pp mod suggestions
  201. Balanced Bridge mode?
  202. Little Bear P5-1
  203. 10M45 power diss. w/ 6EM7 (12mA)
  204. Do we need this input resistor?
  205. Brimar thermionic products 2015
  206. 'Cheap' 2A3 P-P OPT
  207. Thoughts/?'s about gain stages and PI
  208. Remember the Ekco radios.
  209. Converting hybrid from ECC88 to 6N1P
  210. What is, --'Crosswalk'...?
  211. first time dyi help
  212. 500k potentiometer to 100k - okay?
  213. B&K 707 Chart for Russian Tubes
  214. rca transformer output
  215. Western Electric 300B tubes
  216. Interstage transformer crosswalk help
  217. DC coupled MOSFET drivers for output stage - simple questions
  218. 813 PP Audio Amp Help
  219. Bargain basement coupling caps
  220. TX 2575
  221. HK Citation II Negative Feedback question... how can I measure it?
  222. a little help with the aikido lv?
  223. Is it possible for a tube to not light up without any visual other indicators?
  224. Oversized OPTs
  225. How to calculate global NFB CAPACITOR. Is it needed?
  226. Simple driver for positive grid tubes
  227. Surplus for tubes in NY and Miami
  228. Lux CL-35 tone control simulation issue
  229. Stereo SE in Parallel?
  230. 6AR6: A new tube to play with
  231. Time for another dumb question
  232. CBS 12AU7?
  233. SE UL 6V6 GT
  234. RCA output transformer part # 246860
  235. 801A Battery Bias
  236. Acoustat Servo Amps
  237. how to connect output transformers??
  238. Tube Amp Power transformer getting Hot...dumb question
  239. Where to get tubes for DCPP build?
  240. Pro and Cons to use 4 ohm tap for Global Feedback instead of 8 ohm tap
  241. Any quality Chinese tube amps?
  242. 6V6 Single Ended question
  243. C. Follower w/- active load
  244. Bias adjustment in Stereo Power Amp with 4 x EL34
  245. All Tube MC Phono Head Amp
  246. Marantz 7 Tube pre-amplifier PCB Board Design
  247. Miller capacitance
  248. Regarding pin 1 & pin 8 EL34
  249. Better place for noise to put the Global Feedback resistor
  250. Change 12AY7 to 12AX7 Tube. Waht new settings?

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