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View Full Version : Tubes / Valves

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  1. Power Transformer - Can you use separate tap for screens?
  2. Power supply for PP1C - sanity check
  3. Blue Velvet preamp
  4. Paid 5$ for this deluxe/vibrolux schematic! some connections missing help!!
  5. Universal Power Transformer
  6. Tone control in a TubelabSE?
  7. 300B Sweet Spot
  8. Does 81ma sound about right?
  9. Frank's EC8010/6C45P-GM70 SE Interstage.
  10. I need a bit of help to fine tune my PP EL84 amp
  11. IS there any OTL pre amps out there?
  12. Rubycon oil caps
  13. 6BQ5 Sweet Spot?-Charts for other than 250 Screen Volts?
  14. Project Planning (Steps/Order)
  15. Question about coding on tube
  16. 6H13C OTL using 12 parallel tubes
  17. SE 2 watt clean amp?
  18. Transformers for tweeter amps on ferrite donuts
  19. Noob Help: Converting Thomas organ / Wiring
  20. Vintage power transformers
  21. 1625 pp amp layout - comments invited
  22. Grundig 3028 HELP
  23. Oscillation in hybrid amp, how to solve?
  24. Hipass filter to control master bias? - Why attempt to reproduce DC in a tube amp?
  25. Audio Note M-Zero remote control problem
  26. SE TESLA E34L
  27. Need help to restore Sansui 500A
  28. Push-Push OTL?
  29. Stereo Circlotron using only two supplies...
  30. Mercury 1000/2000 KT-88 and 6l6 design bug
  31. Has some tried to use E/PL81 in PPP setup
  32. Heatsinks for tubes?
  33. Mechanical Isolation for a Power Transformer
  34. My First Tube Amp Build: S5 K12G
  35. Size does matter!
  36. tubelabSE with 300b
  37. EL509 (JJ) or PL519?
  38. Clone of JTM45
  39. how can i build a Choke?
  40. A new design
  41. My first and last DIY tube amp !
  42. anyone help convert dual volume to single?
  43. 480-0-480vac To Power A SE GM70!??
  44. Triode plate resistance == internal negative feedback?
  45. Quiz: which tube is this?
  46. 6EM7 Headphone Spud - Please comment
  47. replacement tubes
  48. Mengyue Mini EL34B stereo balance issues..
  49. Email Address for Heiner Jakobi ?
  50. A quick tube matching question
  51. 30W triode?
  52. My Project: Pilot 602
  53. Fake glow LED under valve in commercial devices
  54. Unknown PP output transformers
  55. Switching Amp? 25watts WITH OUT tubes or Transistors?!?
  56. Power Supply B+ voltage?
  57. Newby here first post.
  58. Cheap and easy tube amp.
  59. Rate/critique my Dynaco A410 mods..
  60. Hammond 1650n and Dynaco mark III circuit.
  61. A quick safety question
  62. George RE: 26E6WG
  63. Advice for a beginner please..
  64. Balancing the PP cathode bias
  65. Hybrid Circlotron Amplifier with only 3 components on the signal path
  66. PARTRIGE transformer
  67. Western Electric 205D Tube for Preamp?
  68. Does anyone have the PDF for the Plitron 4142 ?
  69. 16sj8
  70. Mumbo-Jumbo and power supply caps
  71. Restoring Baldwin 40 watt amps
  72. LTspice U/L Transformer Symbol
  73. advice please, a setup to characterise opts
  74. 809's in Class B P-P w/feedback
  75. 5-pin plug needed
  76. Shorting Plugs
  77. Simple Audio Generator
  78. SE Amps with Variable Impedance Loads
  79. Linearity
  80. PSU Transformers for 6922 SRPP tube preamp
  81. 6JN8 curves?
  82. 6C6-2A3 Amplifier: Changes for 45?
  83. Which rectifier tubes are still manufactured?
  84. transconductance effect on peak power?
  85. Good Power Resistores ???
  86. Super cheap triode amplifier
  87. OTL designed by Glen Orr AudioXpress
  88. Heater voltages
  89. wire thickness
  90. JC Morrison circuits
  91. Building Valve Amplifier from schematic
  92. CliffUSA VS Cliff UK
  93. WHERE ARE;AND HOW ARE THE HARMONICS GENERATED?
  94. resistors for LT317 heater circuit
  95. Function of R2
  96. balanced input for any amplifier
  97. Spect output peak to peak for 807 SE ul
  98. HK Citation II Output Transformer Data ???
  99. Looking to purchase non-working output transformers
  100. metals!
  101. Another 2A3 build
  102. where r crossline master volumes from?
  103. Output Audio Transformer Impedance
  104. The echo effect of a headphone AMP
  105. flexy -a multirole driver/preamp-
  106. Scott 233 Bias procedure question
  107. What to do with 6DQ6B's?
  108. Goodcomponent - another chinese supplier
  109. Do EL34s in pentode mode PP AB1 sound better with lower screen voltage?
  110. Bogen MX60A as pre-amp
  111. kiwi.baby-huey. And so it begins...
  112. "sustain bias" and other organ amp ?s
  113. max current draw according to loadlines and reality
  114. Where to buy EI transformer bobbins?
  115. DHT filament circuit layouts ?
  116. After PP projects new SE project
  117. Gyrator Frequency Response?
  118. converting a dynaco mark IV driver board for headphone amp use
  119. Dared mp30
  120. PP pentode tube headphone amp PCB needed ( 6au6 thru el84)
  121. low wattage valve amps
  122. 6LU8 in Moscode 600
  123. The Octal Preamplifier with Phono section
  124. Which tube does my amp use? 12AU7 12BH7 12AX7 6CG7 others?
  125. Wacky Hum and Harmonics
  126. Constructions of ShuGang's 211 and 805A
  127. Tube ID help needed (EL34?)
  128. 5881, 6V6, EL84, or 7591 for triode-strapped operation?
  129. Strange Grounding Problem - My best guess: ghosts.
  130. High voltages
  131. PAC Perfectionist Audio Component preamp
  132. plate stoppers or cathode stoppers?
  133. Need Spud Amp schematic
  134. 5654 (6ak5) line stage in triode mode
  135. PSU capacitors
  136. Shuguang Treasure 300B-Z
  137. Rogers Cadet III input impedance
  138. Aikido w/ tone controls
  139. UTC Z-2961 input transformer
  140. Please help me improve my headphone amp
  141. Faint Hiss/Hum.
  142. What tubes with 3.3K p2p output?
  143. Strip board project completed.
  144. 6V6 SE VS ECL85
  145. 6v6 PP biasing question
  146. Phone Preamp PSU
  147. How much would a cathode follower drift ?
  148. Strange hum in a Williamson amp
  149. Tube preamp for a TDA2040 chipamp
  150. Heater problem
  151. A couple newbie questions
  152. 100KW Power Amplifier
  153. Excellent NOS Russian 6Pi3C/6N3C (6L6GC) Tubes...
  154. Flea-power class-A2 using a power opamp driver
  155. plate to plate feedback - measurements
  156. DC heat float with 50V bias tap from mains transformer?
  157. repair shop
  158. What to build next?
  159. Fisher X-100-C Output Transformer needed
  160. Schade Feedback
  161. RH807 push pull ?
  162. RIAA lite no.ls37
  163. help I need some addres tube store in amsterdam
  164. Valve curve tracer gm tester
  165. 50C5 pentode LTSpice model
  166. "Iron Garter" Push-Pull Amplifier
  167. Mcintosh Mc-3500 sound
  168. A couple of PSD questions
  169. parafeed - Gyrator vs CCS anode load
  170. Compactron amp... LIVES!
  171. Opinions Please
  172. Aikido REV D pcb
  173. New Edcor opt, what would a 150ohm primary be used for?
  174. GM-70, A2, biamping
  175. Espressivo Headphone Amplifier on Budget
  176. Coupling Caps for Aikido ACF Buffer
  177. How to compute current at control grid of power tube?
  178. High voltage SS output, any experiences ?
  179. Back on the forum after a long hiatus 6SN7 Preamp project in the works.
  180. Look for Single Tube scheme
  181. Cathode follower amplifier, push-pull, xformer-coupled
  182. help with "bruce heran" el84 amp S2
  183. Triodes and current flow
  184. Heaters Constant Current Regulator
  185. Driver Tubes: Help Me Decide
  186. Possible tweak
  187. DHT Driving Pentode Output Stage Question
  188. 50C5=50l6; 12av6=12at6
  189. Any experience to drive 805 tube?
  190. Fixed short in a 45
  191. power amp current
  192. Phase inverter/power section
  193. Concerned with current dual 5U4's...
  194. What tube is this?
  195. Signal tube noise!
  196. McIntosh Goodness From Scratch
  197. Marshall Amp strange wiring
  198. Fisher Output Transformer ID
  199. Stepped Attenuator for Air Tight ATC-1
  200. Caps .
  201. The Tube Killer Killer?
  202. Martel FAX-200C
  203. 6n6p headphone amp
  204. 2 caps vs 1 (adding low value teflon to pio)
  205. Ouput voltage of a triode stage on quiescent state should be zero?
  206. Hum Ho
  207. build a OTL (output-transformerless) amplifier
  208. 6v6 PP maggie with Polk SDA 1C
  209. Stromberg-Carlson AU-32 distortion in preamp
  210. Please Help - LF Peaks/Dips & Clipping
  211. Anybody watching this?
  212. Trying to find an unusual schematic posted here this Spring
  213. If you were going to build a OTL?
  214. Protecting a valve variable LM317 power supply
  215. EL34 PP PROJECT
  216. Matching tubes for PP
  217. Calculate triode strapped characteristics from pentode data?
  218. 6922 Loading Question
  219. corrections for LF and HF peaking
  220. 300bSE journey under way
  221. Why shielded tubes
  222. Aikido LV 6N27P SMPS completed
  223. Tube PS question: Acceptable ripple
  224. Back at the 45 SET
  225. Time to replace my 50 year old filter caps...
  226. Amazingly low distortion -- Radford-based design
  227. To ground or not to ground the OPT secondary, that is the question
  228. Ultralinear Observations and Questions
  229. FEEDBACK DELAY TIME
  230. 6SN7 v 6N8P v 6H8C
  231. NOS radio parts awaiting for my pick up!
  232. Toroidal Transformer Cover
  233. VTV 6sn7 line stage project
  234. can something be made using these tubes
  235. Help! Need tube tester info for 6CW4 Nuvistor
  236. Hampton MC preamp
  237. J-fet - tube DAC analog stage
  238. geloso 3270 power amplifier
  239. Belton micalex tube sockets any experience ?
  240. DeathTrap 500™ - An Engineer's approach to the 300B SET
  241. My First Power Supply
  242. 5aR4 Rectifier Problem, Help! Little Long
  243. Electrolytic vs Polypropylene cathode
  244. Size of 5Y3 tubes?
  245. 3C24 really is a fine output tube...
  246. Yaqin MC100B Newbie Questions
  247. JE simple 45 SE grid leak resistor question
  248. 26 vs 27
  249. Bypass the tone control
  250. CCS with VN2222L