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  1. Winter upgrade project - new heating unit
  2. 6KM8 amp
  3. Power and output transformers to ground.
  4. Help with this schematic? B+? B++?
  5. What to do with this old amp? suggestions please.
  6. DIY CAT SL1 preamp
  7. Phase inverter, your comments welcomed!
  8. Basic Bias Question for PP Amp
  9. Oddwatt 5751/6550
  10. Please help me to identify Telefunken PCC ...
  11. Modification of 300B SE Amplifier
  12. 300B Tube and Amp Questions
  13. ST70 "Imposter"
  14. cathode follower question
  15. marconi tubes....can someone idntify these
  16. DeathTrap400 : : A Pretty Damn Good 300B Amp
  17. SOS: First Build, Lots of Hum
  18. 1959 Silvertone Syntronic Can Capacitor question
  19. KR Audio Marconi R valve amp?
  20. Distortion
  21. Tung-Sol 6098/6AR6 Substitution
  22. Dropout in RTP3 phono stage
  23. Audio Research EC-3 modification
  24. 300b all-DHT SET
  25. My first tube project !
  26. Trouble with homebuilt amp
  27. Music angel el34b problem
  28. Elecrolytic capacitor reforming
  29. The end of tubes?
  30. Two stages EL34 power amplifier
  31. 7199 replacement in AMPEX 6973
  32. IT coupled tube-SS hybrid amp suggestion- needs development
  33. Original Cary CAD-300se upgrades?
  34. Convert Integrated Tube Preamp to an amplifier
  35. McCurdy AM405 Schematics
  36. Looking for Neumann N149 power supply schematic
  37. B&K model 747 tube tester for EL34
  38. Behringer DEQ2496 for testing amplifiers and preamps frequency response ???
  39. I need datasheet of 8753 tube, help me!
  40. New 6L6GC Project. DC -> LTP
  41. EL84 in UL
  42. 1953 revere amp conversion
  43. Manley transformer specifications
  44. Recommended 300B SE Amplifier Designs
  45. Found a new interstage coupling method (?)
  46. Amplifier Distortion (Northern Electric)
  47. when do filament supplies need to be floated
  48. gm70 filiment transformers
  49. Replacing 6922 Preamp Tube in ARC LS7
  50. Please educate me: Tube testing, the life test, and Grid Leakage
  51. 6AR6 6098 Triode PP Load Line
  52. music reference rm5-4 schematics
  53. S5 K-12G output trans
  54. Transformer center tap question
  55. EF86 + 4*EL84PSE
  56. solid state relays for plate load switching?
  57. Dont have a power transformer?
  58. Kora Equinoxe Triode or Blue Circle BC-21.1 preamp?
  59. Pre-Amp For my Tubelab Simple P-P
  60. Power Transformer Help
  61. Analog Metric 2A3 PP Kit
  62. Good, starter OTL kit
  63. Dual SE amplifier? - (not PSE) - Take two!
  64. Mysterious SE OTL headphone amp from China?!
  65. Inv. Futterman with gain stages between PI and O/P?
  66. PSU configurations for tube amp
  67. HP Model 712b Regulated Power supply
  68. Dynaco low Power Amp
  69. 300b power suply
  70. Very Strange Preamp Issue
  71. WTB: I am looking for a Freed 1400V or Chicago 1200V/1400V Potted Power Transformer
  72. tube transformer suppliers in Mercosur
  73. Please Help: 6CJ3 Damper Diode Tube as Rectifier Question
  74. time delay sophia electric
  75. Twisting the leads of filter choke
  76. This SPUD's 4 U
  77. I am Looking for tubes
  78. Thuan
  79. Nanjing 6V6GT ( 6P6P)
  80. Should I keep this old stuff?
  81. 300b
  82. ganged output transformers
  83. Holco H4P Resistors, Should I use them?
  84. 6BX8 curves, help !
  85. SANSUI AU-70 or 1000A???
  86. General Electric YTW-1 Tube Checker
  87. Ground or amp hum-which?
  88. need help to fix the "hiss" on my tube preamp
  89. Best SE interstage 1:1 for min. 15mA?
  90. Dual Single Ended Amplifier? - (not PSE)
  91. RIP Forum Member "Ivey"
  92. Balanced Buffer Needed with a Balanced Volume Control?
  93. valves to replace opamps in cd player
  94. Replacing capacitors on Audio Research D40 power amp.
  95. No sound and low B+?
  96. Replacing capacitors on Audio Research D40 power amp.
  97. 2 Channel Tube Amp and Sub Connection
  98. EZ125 Amp Project
  99. Yaqin MS-22b Phono Amp
  100. First post and a couple P.P. questions
  101. adding a preamp to tube power amp
  102. 6SN7 6N8S preamp suggestions
  103. 300b polarity
  104. Electrolytic capacitor vs extra triode stage
  105. WE JAN 274B Dating
  106. EICO 666 Tester Help
  107. Hickock 550X signal voltage
  108. First Headphone tube amp kit to build??
  109. Anyone owns a Dynavox VR-307 Amplifier ?
  110. NOS potted Chicago Transformer 1BC-150
  111. capacitor voltage for tube amp power supply
  112. 808 SE Design Help!
  113. Why can't I build my own ARC LS-5 or CJ PV-12?
  114. Post-mortem on a 80 year old 2A3 amp
  115. 6e5p gm70 with 6d22s?
  116. 6L6-6V6-EL34-KT88-6CA7-EL84
  117. Scheme for SE amp
  118. $16,000
  119. Hybrid power amp
  120. Diagnosis please
  121. On now! Jamerson's Ampeg
  122. BK 707 Tube Tester Mods
  123. monarch 614
  124. Separate Filament and B+ Switches
  125. Dynaco Low Power with 12AY7's
  126. PTP kits available?
  127. Which OP transformer and materials?
  128. Power of Tube Amp and Transistors Amp
  129. testing tubes
  130. current servo not voltage.
  131. Help Me, How to make Pre-amp using 12AU7 tube and Op-Amp Ic mix?
  132. 300b filament
  133. DHT SE auto bias circuit
  134. Anyone try swapping 6SN7 w/ 6F8G
  135. Eliminating Cathode Bypass Caps In SET Amplifier
  136. Nano vacuum tube
  137. Help High Line voltage
  138. Switchable Amp Output?
  139. PCB or hardwire?
  140. 27 line pre amplifier
  141. Mystery tubes on FB?
  142. amplifier discussion
  143. Mikael Abdellah KT88 SE with Cornet2
  144. 5879 to 12AX7 conversion
  145. CCDA SE output stage?
  146. Bravo V2 tube headphone amp - high pitched noise?
  147. Preamp Grounding Question
  148. SE on 300B
  149. musical paradise mp 301
  150. Newbie plan
  151. Capacitor Voltage rating Question
  152. Can anybody identify this amp?
  153. Old RCA radio; can anyone ID this?
  154. Class AB2 - Kink, how and why?
  155. 6SL7, 6J5, or 6SN7 unity gain buffer amp
  156. CCDA dissimilar triode preamp
  157. NOS NEGLECTED HIGH-END AUDIO TUBE
  158. GOSS C-core suppliers in UK/Europe
  159. Old radio -> tube amplifier
  160. Sowter 8650 in SE
  161. My Russian SET
  162. Raysonic vs. DIY tube amp?
  163. Which pins to use first?
  164. Bypass gain stage on K16LS amp
  165. Schematic help for a Pilot 505 amp please
  166. Question re: Distortion in triode gain stage
  167. Newbie needs help
  168. Marantz Model 9
  169. Is my power transformer bad?
  170. japanese 6v6 amp on youtube, anyone got the link?
  171. First attempt at tube amp.
  172. 6p3s,6N1P,6j1p
  173. 6bq5 p-p diagnosise
  174. MFA Lumi suddenly whistles (on bench)
  175. Pure tetrode and negative g2
  176. ECC85, EL84 tube amp please help.
  177. Pentode buffer.
  178. 5k:8 ohm vs. 10k:16 ohm output transformer. What is the difference?
  179. Help restoring old Maas-Rowe amp
  180. Early Sansui Valve Amp
  181. mismatched transformer impedance question.
  182. Second-hand or NOS tubes?
  183. Any suggestion for a 12AT7 / ECC81 SRPP powerstage ?
  184. Looking for High voltage double triode
  185. Will this ebay cover fit my Scott 272 integrated amp?
  186. My new find
  187. Thordarson Dual Tone Control
  188. samsung experiments with "tube sound"
  189. PP OPT design
  190. Heater voltage drops?
  191. WE448A data
  192. How come signal input capacitors are not on every amp?
  193. Any body can help to identify this pair of OPTs.
  194. tubelab SE component mounting
  195. Pre-amp for Tube Sound
  196. Audion tube amp capacitor questions
  197. Capacitor Substitution
  198. Hello, looking for advice on a tube project...
  199. Testing my Tube Tester
  200. Is this speaker a good choice for Tube amps
  201. Suggestions for upgrading my first tube amp!
  202. Why does the Miniwatt N3 have 4 connections to its output transformers?
  203. Anyone know if there is an octal
  204. Cathode Follower, where is the 3d H gone?
  205. Sylvania 45C14M progress.
  206. Collins R-390 Audio Deck
  207. 2 stage 2A3 SET - why does the 6n6p sim so well?
  208. Hi Everyone! Your thoughts on my Yaqin dilemma
  209. Audioromy in Shanghai ?
  210. volume Pot noise
  211. Full Music 300B solid plate sound fine ?
  212. Removing cathode-bypass capacitors, and compensation
  213. Q: UL PP Instability - Anode Grid2 Snubber
  214. The Shuguang SG-50 really support 650V in the plates ???
  215. Addinging windings to an Antek AS-... transformer
  216. Supertex dn2540 CCS Rset trimmer value
  217. help with amp ohms
  218. First Kit
  219. High-End Tube preamp with ECC88
  220. ALERT! WARNING! J. SOUND LAB 300b
  221. Gott 30u tube amp (biggs of ca)
  222. Tips needed for some testing my newly built tube amp
  223. Need help for designing C3g pentode driver for 6b4g se
  224. another circuit idea
  225. EL41 PP triode strapped
  226. Odd-ball PI circuit identification request, and headroom question
  227. b+ Delay Arrangement for Power Amp
  228. Stackin' Chokes
  229. Source of IXYS 10m45s and other CCS devices
  230. Help identifing a 12ax7a
  231. EICO HF-60, rebuild and test
  232. Hum in homebuilt amp
  233. 845 Heater Power supply problems
  234. Tubelab SE choke
  235. First Amp Build, (But not complete beginner to electronics)
  236. X10 V3 SERVICE MANUAL
  237. PP kt88 amp problem.
  238. How much power do I need?
  239. Hickok TV-7 D/U calibration
  240. 12 VAC for both AC heaters and DC B+ via voltage doubler?
  241. Adding CF to SRPP to lower output impedance?
  242. BCF build
  243. 12vac heater - dc elevated question -
  244. 6V6 VERIABLE TUBE REGULATED
  245. please help identify jennen tube amp.
  246. Settings for ECC808 tube on 539c tester
  247. KEG-EAR 6L6-KT88 PP AUDIO AMP
  248. Aikido LV
  249. RH-84 voltages
  250. RIAA Tube Preamp Build (Part 1)

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