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

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