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  1. Preamp with humming noise!
  2. How to choose line out transformer?
  3. Tools for Cutting Tube Socket Holes?
  4. Switchable SE.
  5. GZ33 in place of 5U4 can it be done?
  6. phase splitter issue
  7. Armstrong A10 MK2 EL34 mono block
  8. "Ug" The Transformer
  9. i think its time i start playing with caps
  10. problems with preamp on home brew
  11. LS180 Tube Socket?
  12. simple question - 5V heater power supply
  13. Lineamp
  14. FI AUDİO 421 A
  15. Pete Millett has another Red Board for sale
  16. Jolida JD9 Problem
  17. 6N11 = 6N1P ?
  18. K12-G tube amp problem
  19. Please vote for one of the schematics.
  20. Advantages of separate PS for input and output stages
  21. Another PCB tube amp design
  22. Help. Replacement OPT sqrueeechhh.
  23. New concept of a power amp
  24. Lundahl and rectifier mismatch?
  25. Resurrecting weak tubes
  26. Best DHT heater?
  27. Help requested for EL84 SET amp
  28. What did I buy??
  29. Edcor and Custom Power Transformer Design
  30. What would you make with this power TX?
  31. Lundahl 1676
  32. DHT for 300B problem
  33. Newbie question about output transformer to speaker matching
  34. Red board add-on phono/RIAA pre-amp
  35. 2 Chassis amp
  36. Is It posible to bridge two quad II monoblocks?
  37. Power tube at work picture
  38. Tube SE power amp , which one??
  39. Hickok 539A issue
  40. Noise in one channel? Pioneer SX-400
  41. Hartung / Prestla OTL amps
  42. Lafayette Model 417
  43. Extreme plate load
  44. What do you think about this idea
  45. el84pse schem, need advice
  46. Video pentodes as outputs
  47. Custom Vibrolux Reverb noise issue
  48. Chinese "Audio Research" KT88s
  49. Fender bandmaster rectifire problem.
  50. New 6C33 Socket
  51. 2a3 PP output transformer
  52. PSU problem - Murphy is an ***hole!
  53. Best SET design?
  54. Anybody ever tried EBC41 as 12AX7 substitute?
  55. The 7242
  56. 12bh7a
  57. Phase Splitter Help
  58. Oscilloscope Question
  59. sizing opt
  60. 6P3C-E Datasheet help
  61. on the toroids again
  62. OPT problem or Something else 6L6 PP
  63. Look what I found!
  64. Help, Diy tube amp
  65. Idea
  66. a few DIY tube amplifier setups
  67. 6L6 PP amp motorboating
  68. Mayer-inspired 4P1L
  69. 6L6 WGB 2X34W STEREO AMPL
  70. Isolation transformation wiring project help
  71. Tube Amp DIY or Retail
  72. Supplier for GU50 tubes
  73. 2E26's
  74. Encel Stereophonic M.F.B CSM 40 amplifier
  75. Mono 300B SE Amplifier
  76. Broken tubes for 3D Modelling
  77. Loud hum in one channel
  78. 6EM7 PP question
  79. 12AU7/IRF610 Hybrid Amplifier
  80. 12AU7/IRF610 Hybrid Amplifier
  81. RIAA preamplifier
  82. Classic amp, Chinese or scratch-build for Quad ESL?
  83. CLASS A TUBE AMPLIFIER FOR TWEETER
  84. How to gap output transformers?
  85. Cathode bypasses - partial bypass and combination bias
  86. Phase splitter
  87. YS Audio balanced Preamp
  88. Low voltage 12AU7 (19J6) -- re "starving"
  89. phase splitter
  90. JTM30 output transformer
  91. Music Angel Meng 6P1
  92. Is it possible to dampen a partially microphonic 12ax7?
  93. Pioneer SA-810 tube amp.
  94. 6C33 D.C.M.B. - Paging Ari Polisois
  95. Whose is this logo?
  96. What is grid resistance of 807/6l6 in pentode
  97. PAS Upgrade Boards by Epperson
  98. Bang and Olufsen 609k stereo se el84 fm tuner
  99. Finished EL34 tube amp... but oscilates weird..
  100. Scope Trace
  101. Drifty tubes
  102. Choosing plate voltage
  103. Determining Zout for SRPP
  104. PX25 amplifier - thoughts?
  105. Testing Ck5703 tubes
  106. When can screen voltage be higher than plate???
  107. 31AL10's
  108. Lafayette TE-50 Tube Tester
  109. Acoustic (not Audio) Alchemy - I need a wizzard
  110. current feedback
  111. dac with tube buffer/preamp
  112. Sowter 3607
  113. Back to Loftin-White
  114. What to build? (I have a lot of parts)
  115. Grounding chassis through RCA
  116. K40Y-9: Questions And Comments
  117. buffer line stage schematic
  118. Dual triode Thanks for the pre-attenuation link
  119. Help With Alps Volume Pot Noise
  120. 6AM4 driving 45???
  121. Franks 6sn7 line stage question
  122. Edcor power tx XPWR035 issue
  123. Recommend me a schematic for El34 or KT88 ?
  124. RH84 Power supply
  125. Pentode driving a SE triode? any experience?
  126. Big tubes thread
  127. Meng Yayi KT88 MonoBlock
  128. Old Dumont Console - Story and Questions
  129. Newbie GlassWare Aikido All in One Questios
  130. Building my 1st tube amp
  131. A good tube for my SE 5K-8 OPT's
  132. 6c33 - ready, SET, GO
  133. Noisy tube rectifier goes quiet when i put my hand NEAR it
  134. Tweed 5E3 Deluxe Project Problems
  135. Strange ancient looking tube amp
  136. Vintage Dynaco vs. Triode Electronics
  137. LINE PRE - 6N9S - 6dB
  138. Can I balance a diff stage like this?
  139. Ways to design for low IM distortion
  140. Genalex KT88 Plate Dissipation Question
  141. difference between SE and PP transformer
  142. I put a bad ouput tube in my amp, did I hurt it?
  143. Vox AV 100 Mk2
  144. Stereo amplifyer project
  145. 6sl7 6sl7 dynaco driver board
  146. PCB for stand alone 5W SE
  147. Triode VS. UL bias
  148. How to test a DIY amp?
  149. Morgan Jones 4th ed
  150. How close is too close when designing an amp
  151. Fatman I tube Problem
  152. 807 p-p tube amp schematic
  153. TUBELAB SIMPLE SE
  154. Listen to 6DJ8 Triode through Power Chip IC. Easy project.
  155. Cheap motor caps(MKP) vs Electrolitics
  156. James O/P Tx
  157. Ripple reduction with added voltage compensation to HV
  158. SEVETLANA "SV" 6550 C vs 6550 C
  159. Frank's 6SN7 - plate follower, noise
  160. Help running RH807 at higher voltage
  161. Preamp hum issues
  162. EML mesh plate 2a3 in DRD amp
  163. How to run RH807 at 400V?
  164. Preamp Umbilical - Use Shield as Ground Lead?
  165. Automatic Bias Control sliding bias
  166. Edcor Output Transformer Resistance
  167. Would this be worthwile restoring?
  168. Historic Tube Amplifiers
  169. 6HF5 testing
  170. A quick question about NFB
  171. PAS3 - are the tone controls really *that* bad?
  172. PP OPT in SE mode operation?
  173. Cheap 6n6p double ended push-pull idea - thoughts?
  174. Vintage WE Tubes
  175. SE amplifier advice..
  176. Mineature Tubes
  177. MD SM 102b transformer spec's please
  178. Vintage Marconi radio
  179. second order harmonics
  180. Hybrid amplifier
  181. Input caps for Motorola Console Amps
  182. to much gain
  183. Question - Type 19 tube
  184. alternative for footswitch??
  185. Noob. Help PP EL34 / EF86 both as triode schem.
  186. Yet another LA-2A
  187. RH84 SE, pentode driver... advice please
  188. Having an issue with a MOSFET in my Blue Hawaii
  189. Info wanted on OPT....
  190. 6P43P Strange Plate Graphs
  191. Multiple Phono preamp
  192. pas filament supply
  193. HV on high voltage amps
  194. Lageschaar hybrid-connection PSE-KT66
  195. First DIY from scratch
  196. Ballance resistors
  197. casing about SOHA I headphone amp
  198. Any interest in 56 various tubes?
  199. Help with exploding tubes!
  200. My new filiment PS for Push Pull GM70
  201. So what exactly do I have here? Heathcraft EA-2
  202. Please help identify this Amveco toroidal transformer.
  203. first experience with retro electronics
  204. Revising a tube pre-amp: can't find parts?
  205. Info for Pioneer SA-810 tube amp
  206. Has anyone tried tx2575 in cathode resistor?
  207. 12JZ8
  208. Is it OK to drill mounting holes in transformer laminations?
  209. Seeking Sescom Transformer Specs
  210. Calibrating a Sencor ??
  211. Capacitor in parallel with negative feedback resistor
  212. Old electronics repair store closing. Hartford. FYI. Not related
  213. CL ad for tubes in MA. FYI only. Not connected
  214. Distortion in amp after warm up
  215. Re-bias when changing from Triod to Pentode
  216. Yaqin MC-10L - Electricity in volume knob
  217. Newbie question about a 300B amplifier
  218. Modified Wavebourn Tower II ?
  219. Elevated Heater Voltages - 40v?
  220. Free Tubes!
  221. found tube i like, only small bits of red letter,what tube brands used red lettering?
  222. Impedance problem Of O/P Transformer
  223. Runaway tubes or tubes drawing excess current--baffling
  224. croft SD3 CROFT PREAMP
  225. valve phono stage on a budget
  226. Dynaco vs. Dynaclone
  227. Amplifier Problem - Need help!
  228. Idea for a 6n1p preamp
  229. K & K Audio Two Terminal Constant Current Source
  230. 6550 Push Pull noise in power stage
  231. 6P1P-EV PP guitar amp tryout.
  232. question about output transformer for guitar amp
  233. Hammond B3 tech help needed. Distortion only on certain notes/drawbar frequencies.
  234. Counterpoint SA-12 wackyness
  235. Shuguang SG-50
  236. manley EQP-1A Tube EQ
  237. El34 PP advice needed
  238. Fosgate Punch 800 a4, diagram needed
  239. Power Transfomer For Valve Amp Question
  240. a 'simpler' tube/valve mixer topology
  241. Qustions about centre speaker connection
  242. Using Seperate Preamp to Drive S-5 Electronics K-16LS Integrated Amp?
  243. 0d3 for el84 screen regulator
  244. Edcor XPWR059 power problem
  245. Did bootstrapping pot change it's operation
  246. Transformer wiring (Need Help)
  247. Class-d Hybrid
  248. New test data comparing different 7591's
  249. Eico 666 Tube Tester Freaks Out When Testing Rectifier Tubes
  250. ZKIT2 Zen Triode mono SET amplifier kit

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