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  1. Safety of DC-coupled inputs
  2. Found some old tubes.
  3. Presence control
  4. lafayette pa 622 -> Guitar amp conversion
  5. Fixing an amp head - bad tubes?
  6. EL84 what factory produced it?
  7. Trio Corp 300b fake?
  8. Cheap triode class A 3Watt + assembled/kit you know ?
  9. Elekit tu 879s upgrades
  10. EZ80 Choke Input Max Capacitance
  11. Correct measurement of filament voltage.
  12. Who put the "half" in the Koren SPICE equation
  13. 5Y3 tube rectifier
  14. Triode or ultraliner connected ?
  15. What is the "Tube Sound"?
  16. Here are some 12B4A, CCS, Preamp Circuit and Spice models
  17. Which KT88 ?
  18. Why make a tube amp that sounds like a SS amp?
  19. Mark VI power Supply
  20. audioromy fu29 - not working, repair or scrap?
  21. Valve amp questions for someone new to them.
  22. Driving Parallel Tubes
  23. Matching quad set
  24. Anyone listen a 46 in UL mode ?
  25. McIntosh MC30 vs. Fisher 80-AZ
  26. Voltage Divider at input to Power Amp
  27. Checking EL84 with Eico 625
  28. Dynaclone ST70 6F2 Alternative
  29. Nobsound MS10D
  30. Need Help - Monoblock Power Amplifier EL 34
  31. Replace output transformers in Dynaco ST70
  32. 6P14P-EV in my Simple P-P
  33. Help finding a new tube headphone amp
  34. Cost of building from scratch
  35. Help with loadlines in p.s.e.
  36. Simplified pentode Loftin-White with plate-plate feedback
  37. Inductor Fed VR Tube
  38. Screen Grid Peak Voltage
  39. Unknown (Westrex?) AE285 KT66 cinema amplifier
  40. Has anyone dual-monoed a Stereo 70?
  41. CV2799 (Mullard) QQV04-20 parallel single-ended audio amplifier
  42. Pentode G1 series resistance effects.
  43. MUZAK 975a 75watt, 50s
  44. Hybrid SS/Tube Balanced Mic Pre
  45. Adding a baland pot to cathodes on a cathode biased amp?
  46. Is the 8532W a substitute for 8532?
  47. Low cost class A Hi-Fi amplifier 807 S.E. Ultralinear - Pentode drivers [6G6G]
  48. Configuring 2A3 Driver for 2A3 PSE
  49. Integrated Tube Amp opinion
  50. Ultra-Linear vs. Pentode Longevity
  51. RCA PA amp SA752LO...
  52. Running preamp into acive speakers with cap input
  53. Putting Stock In Carver?
  54. Weak treble
  55. About GU50 PP in UL with separate G2 winding and supply
  56. tube tester comparison
  57. Volume control after the preamp stage or before ?
  58. COPLAND CTA 401 - upgrade of components ?
  59. 2 amp simulation/dummy load for transformer
  60. Optimal Operating Point for E280F Driver for 300B Single End Amplifier
  61. 809 Triodes
  62. PSRR
  63. Looking for a schematic or link to a post
  64. Who makes a Williamson output transformer ?
  65. Help with an S5 K12-G Tube Amp
  66. Turing's new tube amps. Please give staff about.
  67. Life Expectancy of DHT's
  68. 6GB8 data sheet translation needed
  69. Full Wave Rectifiers: Center Tapped vs. Bridged
  70. Vectorscope?
  71. Apple macmini become to 6MD8 tube amp
  72. Potting Wax?
  73. How do I repair my Tube Amp?
  74. asr433 simple problem (i hope)
  75. Russian Tube Codes
  76. Help: Driver Stage Design
  77. PAS Power Transformer Capability
  78. 7A5 tube...a small marvel !!!
  79. phono preamp for the s5 electronics model 16ls amp
  80. Screen Stopper Blew
  81. Hickok 533 and 6dj8/6922
  82. OTL design opinion
  83. Pile of TEK scopes.........what do I keep?
  84. Inclusion of an oscilloscope on tester
  85. 6V6SE - Suggestions?
  86. Heretical Line Stage: BOM?
  87. Tube amp to drive 4 ohm headphones?
  88. Another TVA1 - KT88 power amplifier
  89. 845 parafeed
  90. datasheet 6P44C
  91. ecc85 tube buffer or line stage?
  92. Valvestate 8080 That's been dog Peed...
  93. pre war gibson eh125 schematic question
  94. "An elegant full function tube preamp mated to 1st rate SS power amp"
  95. How to select a good Hifi 12AX7 tube?
  96. LTP with CCS and negative PS
  97. Odd phase splitter
  98. Yet Another Hybrid Amplifier
  99. what Lundahl OPT for headphone 2A3 amp? (for HD800)
  100. Heater to Cathode voltage e88cc
  101. ASR-433
  102. Marantz 8B phase splitter
  103. Silvertone 1485 - Output Transformer advice
  104. Bob Latino ST120 Down
  105. SS phase splitters?
  106. Supply Filtering and why Capacitance Multipliers are NOT the Answer
  107. SE 6L6 to KT88
  108. HT power supply design
  109. Good tubes for concertina - 4P1L maybe?
  110. Powr supply question
  111. What is wrong with this Amplifier?
  112. Palmer DREI - Three SE Output Tubes Together?
  113. Heathkit TC-2 Checker and KT88s
  114. my Dummy Amp Contraption
  115. HF Oscillation Heat-Up Spk's Magnet!?
  116. Triode calculations
  117. Western Electric 131
  118. Electrolytic vs. Film 2A3 Cathode Bypass?
  119. Sylvania JAN 6SN7WGTA, late 1970's
  120. TV7 tester problem with 6CB5A tube
  121. Stromberg-Carlson AP-55
  122. SHUGUANG 2A3
  123. Circuit breaker help.
  124. Recommend me a bookshelf speaker for 5W
  125. Monarch STA 100X weird?
  126. 1954 US Army "Sound Repeater" amplifier
  127. 6N7...this configuration work ?
  128. RIAA Active EQ
  129. Direct Coupled E-Linear Amp
  130. Double Triode Mu
  131. Music Angel kt88 new pcbs problem
  132. EL503 replacement?
  133. Reducing gain in a SRPP circuit with ECC82?
  134. 12XX7 Triodes
  135. Output Tx just for interest
  136. Valab in Taiwan output transformers
  137. Impedance Question
  138. How to include a dual triode tube in a KiCAD schematic?
  139. 12U7 SPICE Model
  140. Phono Stage Woofer Bounce
  141. Problem with new L3-3 please help!
  142. Edcor output transformer...very nice !!!
  143. SE Hybrid Amp "The Lunatic one"
  144. Marantz 8b power transformer B+ down 30%
  145. Single or paralell trafo?
  146. CJ PV 5 Impedance?
  147. ECF80 driving EL84 PP
  148. Luhdahl LL1660S what current rating for D3a driver?
  149. what's that cap?
  150. SE EL84 Component placement Suggestion
  151. How to make a cheap 6N3 Buffer Amp even better?
  152. buying Tube Amps need advice/opinions
  153. dynaco pas3
  154. 5U4GB full-wave bridge, stumped
  155. HELP NEEDED for a 6CA4/EZ81 power supply
  156. OT for 2A3 PSE w/Parafeed
  157. More Dynaco Mark VI Questions
  158. curious feedback in circuit of Pioneer SM-Q300 receiver
  159. Hytron 2E25 - Other forgotten and marvelous tube !
  160. need tube upgrade advice please sir
  161. buyer beware
  162. JJ 5y3S pin 1??
  163. My first Sansui AU-111 Rebuild
  164. Capacitor-induced distortion
  165. Elevating Heater Voltage with multiple Transformer Heater Secondaries
  166. Common Cathode as DAC output
  167. Pre-Amp with russian tubes 1j24b
  168. How to calculate, the output impedance of a tube with grounded grid
  169. How To Draw Load Line With Output Transformer ?
  170. Inter electrode capacitance.
  171. My amp is an oscillator !
  172. TESLA PL509
  173. What value for Va ?
  174. Help selecting an input transformer ?
  175. Should same valves grid voltage vary much ?
  176. Driver options for 300B-XLS (4P1L-IS-4P1L-IS)
  177. Restoring a Scott 299-B
  178. Latest project, 80 watt valve amplifier
  179. PP Amp Doubling Output Power
  180. Setting up a Wilson current mirror as a differential load
  181. interested in tube amps
  182. Baldwin 45P amp project
  183. DIYGene's Jadis JP-200 Preamp Kit
  184. Need design/schematic for 6H30P driven 6C33C SET
  185. Substitute 6AQ8 for my 6CG7's
  186. 6bq5 tubes in a Heathkit AA-151
  187. Marantz 8b restoration: colour code, prints, schematics
  188. Show me your screen drive circuits
  189. Potting Compounds
  190. Chokes in the ground "plane"
  191. OTL idea
  192. Balance control tip for newbee's
  193. Ebay win - is this any good?
  194. 6sn7 pse amp for altec lansing 604E
  195. "Cockeyed Bridge" with damper diode?
  196. Mac 2100 Hybrid
  197. Single-Stage Hybrid Cascode Power Amp
  198. New to Tube amps, heathkit question
  199. 6AS7 OTL PL build
  200. On Bootstrapping diodes for UL G2 MOSFET
  201. Chasing Aikido "hum"
  202. valve monobloc designs
  203. 7A5 is a good driver for the 300B ?
  204. Parallel Push Pull 6V6 design
  205. Black cat caps?
  206. Soundstage
  207. Brains & Brawn CF : where's the catch ?
  208. ISO-TANGO to quit
  209. Shifting reflective loads using secondary taps?
  210. VTL -- 20 6550's a side and their xfmrs
  211. "Diamond" tube preamp with 12au7
  212. Wich factory made this tube ?
  213. Bootstrapped Cathode Coupled Amplifier
  214. OTL 6AS7
  215. Diode performance testing
  216. Monacor SA-10
  217. Volume Control Hum
  218. Stromberg-Carlson AP-50
  219. 5 wire and 3 wire output transformer change ?
  220. Yaqin mc 10L
  221. Can OTL Ciclotron amp use solid state regulated PS?
  222. Cross-channel overtalk with strange effects
  223. Why 6.3V?
  224. KT88 Williamson Design Questions
  225. Winding a center-tap secondary
  226. HV delay switch
  227. McIntosh MC-30...Balanced Input Feasible?
  228. Designing line driver / pre-amp
  229. Bucking and boosting a tube power transformer
  230. 33A-158M
  231. All DHT integrated amp
  232. 6N1P
  233. basic query - Pete Millett 807 board.
  234. Tube Tester with undocumented tubes
  235. "Fritz" the Boston/RI tube guy - ANYONE know what became of him??
  236. EI yugoslavia gone forever.
  237. Quicksilver 8417 Design - Stay with it or modify?
  238. Looking for some advice on odd preamp noise issue
  239. Tubes in an opamp feedback loop ?
  240. Jensen P-P Cathode Follower
  241. Cathode follower rigorous definition.
  242. Little Bear P3 ?!?! opinions ?
  243. NOS GU-81
  244. OPT endbell color!
  245. Music Angel kt88 with unbalanced output.. help me!
  246. Heater Supply Center Tap
  247. SCA-35 Pot noise
  248. Conrad Johnson MV 55
  249. Comments on 6C33C-B ARG OTL
  250. Construction tips for high voltage amps.

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