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  1. quad el84 or PP el34
  2. Inexpensive wire source
  3. to MC30 or not to MC30
  4. unbypassed cathode resistor
  5. Supro Golden Holiday Schematic Needed
  6. Does this transformer work?
  7. Max grid resistance for GM70?
  8. Stacked power supply HELP!
  9. Parallel pwr supply chokes for add'l current?
  10. Need help to verify Amperex 7119's genuineness
  11. Need help/advice on a problem with console amplifier
  12. Getting started with my VERY FIRST project
  13. PCL Vintage Amp VA1956 - transformer issue
  14. Help to Identify
  15. 300B based preamp....looking for schematic
  16. USB Oscilloscope
  17. RH84SE, use as headphone amp ?
  18. The New Yaqin/Music Angel/Meng & Others Discussion Thread
  19. Power triode bias by tube rectifier
  20. Two questions on IR volume control
  21. 25 watt output tube
  22. DC heating my 300b
  23. RNT-900 regulator
  24. KT61 Equivalent - Ping Waveborne
  25. EICO 666 meter needle moves too fast/pegs too hard...help?
  26. Eico 666 meter movement speed help
  27. Running a tube without heaters
  28. SE-BAL-SE Switching
  29. What makes is stereo?
  30. Triple Checking Calcs: metering bias with mA meter
  31. EL84 & 12AX7 Amp possibilities
  32. Weird issue with tube driver.
  33. 6E5P
  34. 6B4G / 6S4S Biasing Question
  35. Quick tube wear question
  36. Looking for a tube amp
  37. Internal placing of components
  38. Preamplifiers v power amplifiers
  39. LP2 dht driver
  40. hammond 1650
  41. reverb
  42. Load For PSU
  43. *PING* Tubechimp
  44. Revamping of a Michaelson & Austin TVA-1
  45. 6V6 Behavior W/Fixed Bias (SE Amp)
  46. Low noise, low microphony, low hum valves
  47. 6L6 / 12AX7 push-pull
  48. bowei amp for audionote ax-2 speakers?
  49. Yet another Priboi thread...
  50. Help Old Radio Philips
  51. Distortion discussion from mosqueto Hybrid thread
  52. Sovtek 6N1P Microphonics
  53. ECC86 / 6GM8 Radio Receiver Help
  54. Los Angeles
  55. Op point for 6au6/6gu5 in P-G feedback 6550
  56. Tube Pre-Amp Schematic Needed
  57. find a YAQIN 5881a amplifier
  58. 11N90C in the SBCCS circuit
  59. Help replacing a PSU choke - How to choose choke
  60. does this look like a joke to you?
  61. Electronic Choke for Valve Amplifiers
  62. Sockets for a WE429A
  63. To bypass or not to bypass...
  64. DIY Curve Tracer
  65. 300B filament winding center tapped?
  66. help me decide,headphone amp - parafeed or normal tx ?
  67. 7060 vs 6AN8A
  68. Psu
  69. Blackheart amp moding question
  70. EDCOR Output transformer for 300B
  71. 80 or RGN1064 Scenario
  72. TUBENEWB - Quad KT88 Monoblocks
  73. CCS in Differential phase splitter?
  74. Need schematic for Smart 2x150vt
  75. Antek OPT
  76. 6DQ6 for audio power amp?
  77. Anyone identify this Mullard?
  78. My Mullard 5-20: some photos and a question
  79. Tube can work in low volt~~fix your knowledge
  80. A problem with a tube receiver
  81. Auto Transformer - safety advice
  82. Where I could find tube in San Jose
  83. 6Н30П spice model for MicroCap ?
  84. Transformer input and resonance
  85. GE6111 Preamplifier
  86. Where to buy audio tubes in Europe
  87. Play iPod into 1955 Record Player's Tube Amplifier
  88. To Schade it , or not..
  89. questions on input stage
  90. Planar/Lighthouse triodes for Audio?
  91. The Best coupling cap..THEL??
  92. 211 SET 40W output design and mfg.
  93. Volume Control with Loudness and no Taps
  94. Use for 4k PP (non UL) OPT's?
  95. Heathkit Oscilloscope O-12
  96. Filament Autobias
  97. Shelby NC Ham Fest
  98. 2A3 Spud
  99. Resistor as a load
  100. How to balance pushp pull DHT finals
  101. 240v to 220v
  102. Hammond 272 FX plate voltage
  103. Drawing Load Line for Parallel Output Tube
  104. question about swapping el34 for kt77 in my tube amp
  105. 6 volt recifier tubes
  106. PSU Capacitor Selection
  107. Output transformer sizing...again...
  108. Power supply cabling
  109. Voltage doubler using PSUII?
  110. Rectifier Tubes in SE Amps
  111. 6v6 SEP
  112. 1967 Pioneer SX-34, 11W, WORTH FIXING???
  113. Jumper Wire Gauge and Material for Phono Preamp?
  114. Tube libraries for AutoTRAX wanted.
  115. DIY Layout Creator for Chassis Designs
  116. ecc99 - 6C19n PP, (6S19P)
  117. Dr Z Carmen Ghia build from a Hammond Reverb amp!!
  118. Strange HF distortion
  119. have a pair of 5k:8 OPTs lying around.. suggest me something to build?
  120. Marshall 1959 (Super Tremolo) repair help
  121. Early history of High Fidelity amplifiers
  122. Which pentode for input?
  123. 6n6p or 6P14P-ev for driver
  124. Old tranny - confused with windings
  125. Dynaco A-430 Vintage Output Transformers
  126. Output tube for 800 Ohm speaker?
  127. Today was the anual Tree Street Yard Sale event
  128. Florida ? what did I get ?
  129. 26HU5's vs 26DQ5's
  130. VoltCraft AT-400?
  131. Sonic differences: 45, 2A3, 300B, 845, 211
  132. Need help wiring a pot for cathode adjustment
  133. Sound of the 6SN7?
  134. A mystery device
  135. Plate curves... Ic2 & Ib?
  136. How to choke load for big voltage swings?
  137. 6550 SE design, please comment.
  138. "Impedance" of the output transformer
  139. Triode-wired small signal pentode question
  140. Calculating output impedance
  141. 6JM6 Infomation for Pete Millett's DCPP Amp
  142. Tube labeld ETBB
  143. Heaters wiring help!
  144. What do you guys think of this IR volume control?
  145. Can you send me the Aikido 5687 user manual
  146. Cathode Follower output cap
  147. EL84 rebuild suggestions
  148. voltage divider in WE91 driver
  149. Power Tx Myth?
  150. voltage multiplier based on SS trafo - LONG
  151. What tube for QUIET phono pre??
  152. A&R 8ohm 4008 output transformer
  153. How does DRD Ultrapath Work?
  154. Russian 6H2p-E??
  155. Started work on my stereo 7027a PSE amp
  156. Mono Tube Comp for analog kick drum
  157. Line stage preamplifier
  158. Trying to select the Aikido components
  159. X-PRE musical fidelity preamp. need help modifying
  160. 6C33C & Borbely Question
  161. 12BH7A in common cathode
  162. Sneak Preview: 9 Band Active All Tube EQ
  163. Bought a set of Greenlee conduit punches for my latest project - WOW!
  164. "Universal" octal amplifier?
  165. MU follower - distortion
  166. lighting transformers 12V
  167. Chinese 6N3 preamp questions
  168. Why are Chinese preamp knockoffs so popular?
  169. 4K7 OPT suitable for 6550/KT88?
  170. Transformer question - 110 v and 25 v from 1 secondary?
  171. About loadline again, how to choose load and current
  172. Parallel Output Transformers
  173. 6SN7 / 6V6 power amp : very odd behavour
  174. HV mA Spec on Large RCA Power Xfmr?
  175. Is the Aikido too 'bright'?
  176. Has anyone put the Glassware phono & line amps in same box?
  177. High impedance balanced output: how long the cable?
  178. Data Sheets
  179. Can I use a LM317 bias on lower cathode of SRPP?
  180. AU-34 Output transformer replacement question
  181. The new KT120 from tungsol
  182. em83 questions
  183. Push-pull PCL84 schematic and a question
  184. confused on power transformer ratings
  185. C3g:GM70:GM70 schematic advice
  186. Can someone explain Load Lines?
  187. Humming from WCF but not SRPP
  188. Gas regulator tubes
  189. My B&K 707 sensitivity seems wonky
  190. Lowrey LC1 B schematic wanted
  191. Complete tube amp novice got a few questions!!
  192. jacked up the bias...WOW!
  193. Looking for PP 7027a shematic
  194. So, if it's not DIY Gene, then what?
  195. What driver tube for 200Vrms?
  196. Tube socket purchase
  197. Something I found interesting a while ago!
  198. Eico HF-22 Circuit
  199. SEDHT amp - decisions decisions
  200. Confused with designing
  201. Digitally controlled analog attenuator
  202. Purchased my 1st valve amp and can only get one channel working, please help!
  203. Another silly tube yesting question
  204. potentially very stupid questions....
  205. Tube rectifier: AZ1, AZ31, AZ50 vs 5u4
  206. Tube Square-Law, what and how to set up?
  207. Need help finding schematic. Conn 720
  208. OPT for parafeed SE
  209. Anyone else tried an opamp as a driver?
  210. e180f/6688 pentode operting points
  211. power supply reassignment problem
  212. Mains power transformer on S5 K-12 kit hums?
  213. Oriole OPT
  214. 26DQ5's vs 26HU5's vs 6KN6's and transformers
  215. SRPP power using power tranny as OPT?
  216. Need guidance with heathkit SA-2 refurbish/mods
  217. B+ discharge times!
  218. 26HU5's....and a confession
  219. Bell Sound Systems Pacemaker Model 2220
  220. Any thoughts on this transformer on eBay?
  221. Need some help figuring out a Wurlitzer 6240.
  222. Bypassing cathode resistor on pp power tube
  223. Is it safe to use a 8BQ5 in place of a 6BQ5 in a guitar amp?
  224. TRIODE Voltage amp + Power OP output follower
  225. Cats and tube-a-holics
  226. Replace Tube Rectifier With Weber CC?
  227. 717a 2 stage SE amplifier
  228. Thoughts on Oatley K282 Valve Preamp?
  229. SS rectifier for SimpleSE and others...
  230. Need match Pr KT-88
  231. EL34 PP - again !!!
  232. S5 K-12 Kit sounds excellent with iPod, but relatively low volume with turntable?
  233. Finished K-12 Kit with cedar / brass chassis (pics)
  234. Groove Tube Dual 75 schematics
  235. Tubes HOT!
  236. Meng volume pot problem
  237. Use P-P OPT for SE?
  238. Safety ?
  239. Film caps always better than lytics?
  240. Valve Preamp for voice / guitar purpose
  241. 851 set?
  242. dual cathode follower problem
  243. Question about connecting grounds
  244. Is it okay for capacitors to be close to the main power transformer in S5 K-12 Kit?
  245. Fisher 500C Schematic
  246. looking for PP 6l6 schematic
  247. Muiscal Paradise MP-301 6V6 amp.
  248. First Build - PS Voltage Question?
  249. Need help about an hybrid amp circuit
  250. Radio to guitaramp conversion hum problem

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