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  1. Warning about chokes by Toroidy
  2. Looking af new 845
  3. 807 Amplifier build.....Help Wanted
  4. Claus Byrith 4-30 - HELP !
  5. LR8 as CCS for small tube cathode follower?
  6. Tektronix 120-086 transformer
  7. 01A question
  8. Determining input impedance
  9. Plate to cathode feedback
  10. Quick question about EL84 PSE
  11. P-SET EL34
  12. 6v6 Preamp Explorations
  13. Monoblock kits for $500
  14. Wanted/Needed Vaic Valve / KR 52B etc.
  15. Measuring Rp on the bench
  16. Clarifying RIAA calculations
  17. Emissions Labs 5U4G use statements
  18. Help me pick my first tube kit/winter project (tube preamp)
  19. Please explain feedback to an ignoramus
  20. Op-Amp/Power tube integration
  21. 12b4a preamp project
  22. Pot to Stepping and ohmic value change
  23. McIntosh MC2000
  24. universal high-gain pre-amp useful ?
  25. 6AX5, the forgotten rectifier?
  26. High gain pentode LTP?
  27. question with heater wiring
  28. Ideas for an hi-fi mono amplifier (and preamplifier)
  29. humm and buzz
  30. ECC88 For LTP
  31. Polam / Telam tubes !
  32. Question about grid input signal voltage
  33. Douk EL34 Amp kit
  34. ID help Please Hammond Amp
  35. rolling ecc88 into a 6cg7 socket
  36. Article Wanted - "High Quality Amplifier with the 6AS7G" by McProud
  37. capacitors
  38. Need a little WE 597A help
  39. Need to find - Triode Va=500V, Mu=20
  40. The Pomato, A hybrid can amp
  41. audio research sp16 phono no rec
  42. Recovered smoother Caps (to use or not)
  43. Effect of raising and lowering B+
  44. Ideas for tube amp EL34/ECC83 single ended
  45. The HiFi show 2015 UK
  46. Coupling capacitors
  47. Brook 12A
  48. Importance of plate voltage on overall performance
  49. Help Precision Fidelity M-7 amp
  50. And so it begins...
  51. What is the cream of the crop for DIY tubes kits?
  52. Amplifier Build - Suggestions
  53. 26DQ5 curves pin out
  54. Toroidal Transformer Upgrade for S5 Electronics K-16LS Kit
  55. VR tube RF issues
  56. usb and 3.5 to same pre
  57. Gain changing on 6n3 tube buffer
  58. Kelvin Capacitors
  59. simple question about on off switch
  60. Engineers Amp chassis
  61. First tube amp design, what are my mistakes?
  62. US 6L6GC identification
  63. PL508 triode curves, help !!!
  64. Multiple gain stages without continually increasing B+
  65. Choke and Capacitor input filters on a same winding?
  66. Any advice value for Volume control if....
  67. For tube lovers-Henry Wolcott Amplifiers from JBL PL100
  68. Help translate stamp mark on russian tube
  69. UK Engineers Amp (my first project)
  70. 12AX7 Heater pin 9
  71. Help With Translating Schematic
  72. Do diodes in the power section produce heat?
  73. you gotta laugh......really!!
  74. Dynachord Echocord S65 needs capacitors
  75. why is dc coupled better ?
  76. ARC grounding question
  77. Littles modifications of Triode Dick's KT88 MonoBill Classic
  78. New 6BG6G Amp
  79. Aesthetix Rhea Power Supply voltages
  80. Newbie - Broken Valve amp help!!
  81. New Build - Geraldine SE Amp
  82. Michaelson&Austin save attempt
  83. LTspice model needed....6JN6
  84. Big distortion of tube amplifier at high frequencies
  85. Radio Tubes Classifieds
  86. Sad and Lonely 6X4 Rectifier
  87. The Wild, Weird, World of GNF
  88. My first tube amp is here!!!
  89. Retro nixie volume indicator
  90. how to connect my corrent output DAC to my preamp TUBE?
  91. Roberts 770x / Akai M8 Tube Amplifier Question
  92. Conrad Johnson MV50 adjustment?
  93. Hum in console preamp after power supply rebuild
  94. Electrohome console amp?
  95. input impedance of mullard 3-3 amplifier....
  96. 6X4 Tube Rectifier Bridge
  97. can I use a zener for cathode bias
  98. Dual 5V winding 5AR4
  99. el84 test jig circuit
  100. anyone use knife switches for input selection???
  101. suggestions wanted for otl design
  102. Converting a single ended amp to parafeed
  103. Online stores for ordering Hitachi Metglas cores?
  104. Box of old tubes
  105. tube preamp
  106. bypassing balance control on VTL Deluxe
  107. Allegro II power amplifier
  108. ECF80 rating
  109. 71a pp parallel
  110. Hammond transformer 1627SEA
  111. Final schematic of my SET amplifier (drilling the chassis of my ex Boyuu china amp)
  112. Building Tube Amp DVD from Australia
  113. Tube preamp
  114. Bigger amp building help
  115. Balanced tube RIAA Preamplifier - Idea Search
  116. One tube brighter/hotter than the others
  117. HMV 2001 1953 record player circuit
  118. D3a - diode between screen & plate (triode) ?
  119. Radiotron/Eli Duttman phono change C1 to .00391?
  120. Mating Martin logan summits with VTL 125s has been a challenge
  121. Learning to Build A Tube Amplifier
  122. how to determine if an output transformer has blown?
  123. Secondary Emission Tetrode
  124. Monster Transformer Has Arrived
  125. wiring tubes in series
  126. Rogers E20a/Audio Note transformer
  127. PCL86 Amplifier
  128. Beard BB100 P35 project
  129. 6p15p
  130. help with paul hynes reg
  131. Vinyl Savor 6CB5A SE Amps?
  132. VTL Deluxe tube mystery
  133. My First SPUD Amp, 6EM7
  134. GK-71 SE amp
  135. 12ax7 Phono Preamplifier
  136. Aikido 6GM8 (ECC86) HPA or How I built a tube amp with non-scary voltages
  137. "Langham" Phase Inverter Origin?
  138. Adding "tube sound" via inline circuit
  139. Radford STA25 Renaissance - HELP!
  140. Capacitor across B+ and the input signal on the primary of the output transformer
  141. Zenith KPS-80 Rebuild
  142. 50+ watt diy tube amp recommedations
  143. Trouble with PSUD 2 high current / low voltage
  144. Magnavox 175 clone w/Fisher OPTs?
  145. First post here, need some help with PSU for amplifier
  146. Novice build of 6EM7 circuit. PSU advice.
  147. All DHT single-ended 211 amp suggestion?
  148. Adding inputs to Melody SP3 mk2
  149. Repurpose vertical output autoformer?
  150. Good ECL84 / 6DX8 Tube - Correct Pentode Spice Model Needed!!!
  151. Assistance with 211 powerdrive type design
  152. Passive pre for kt88 push pull
  153. Current production tubes testing used/low out of the box?
  154. Safe to use bare (laquered) copper wire for heaters?
  155. 10W+10W EL34+ECC83 single-ended Class A Stereo amplifier Kit wlx
  156. Testing Volume Controls
  157. Rowe R-4359A Amplifier
  158. Converting pentode to triode
  159. Nuvistor heater current inrush question
  160. Stereo Pre-amp build issues
  161. Triode 843
  162. 12ax7 preamp tube for jolida 1501BRC
  163. Volume pot for tube preamp
  164. I finally won my fight to kill the hum, but not clear why
  165. HK A500 phono issues
  166. Parallel Damper Tubes for Voltage Doubler
  167. Good schematic (circuit) with tube 12ax7
  168. Potientiameter
  169. HH Scott 299C tube integrated amp channel B music comes on after 15 mins to 20 mins?
  170. transformer wiring
  171. Looking for help with my Emotive Audio ETA Amplifier
  172. Running tubes' filament on DC
  173. 6.3V Rectifiers and winding sharing?
  174. Audio colume controls / atternuators
  175. Determining output transformer turn ratio and impedance
  176. GM70 build startup
  177. Yukon Gold - a spud amp
  178. 310A (328A) triode curves
  179. Can anybody identify the manufacturer of this pcf80
  180. Need advice on Quad 22 repair
  181. 2P1P Russian tetrode
  182. Bogen MO-100 increase PS capacitor
  183. Does O-netics make SE OPTs?
  184. 1939 Rockola amp
  185. Yet another Aikido? NOVAL vs OCTAL
  186. Why are tube amp wattages low
  187. Vintage kt88 pp mod suggestions
  188. Balanced Bridge mode?
  189. Little Bear P5-1
  190. 10M45 power diss. w/ 6EM7 (12mA)
  191. Do we need this input resistor?
  192. Brimar thermionic products 2015
  193. 'Cheap' 2A3 P-P OPT
  194. Thoughts/?'s about gain stages and PI
  195. Remember the Ekco radios.
  196. Converting hybrid from ECC88 to 6N1P
  197. What is, --'Crosswalk'...?
  198. first time dyi help
  199. 500k potentiometer to 100k - okay?
  200. B&K 707 Chart for Russian Tubes
  201. rca transformer output
  202. Western Electric 300B tubes
  203. Interstage transformer crosswalk help
  204. DC coupled MOSFET drivers for output stage - simple questions
  205. 813 PP Audio Amp Help
  206. Bargain basement coupling caps
  207. TX 2575
  208. HK Citation II Negative Feedback question... how can I measure it?
  209. a little help with the aikido lv?
  210. Is it possible for a tube to not light up without any visual other indicators?
  211. Oversized OPTs
  212. How to calculate global NFB CAPACITOR. Is it needed?
  213. Simple driver for positive grid tubes
  214. Surplus for tubes in NY and Miami
  215. Lux CL-35 tone control simulation issue
  216. Stereo SE in Parallel?
  217. 6AR6: A new tube to play with
  218. Time for another dumb question
  219. CBS 12AU7?
  220. SE UL 6V6 GT
  221. RCA output transformer part # 246860
  222. 801A Battery Bias
  223. Acoustat Servo Amps
  224. how to connect output transformers??
  225. Tube Amp Power transformer getting Hot...dumb question
  226. Where to get tubes for DCPP build?
  227. Pro and Cons to use 4 ohm tap for Global Feedback instead of 8 ohm tap
  228. Any quality Chinese tube amps?
  229. 6V6 Single Ended question
  230. C. Follower w/- active load
  231. Bias adjustment in Stereo Power Amp with 4 x EL34
  232. All Tube MC Phono Head Amp
  233. Marantz 7 Tube pre-amplifier PCB Board Design
  234. Miller capacitance
  235. Regarding pin 1 & pin 8 EL34
  236. Better place for noise to put the Global Feedback resistor
  237. Change 12AY7 to 12AX7 Tube. Waht new settings?
  238. Bogen MO-100: Series and blown power transformer
  239. Tung Sol Reissue 6550 Ratings/ Reliability
  240. How do I calculate shunt resistor value in a heater series string
  241. Mikael Abdellah KT88 tweak
  242. 845 tube biasing strangly
  243. Which phono should I pick?
  244. Combination of Philips en Psvane tubes EL34
  245. 388A datasheet
  246. Build diary - Ciuffoli all triode OTL
  247. porta fi modification help please
  248. Help me ID 6SN7 GTB Baldwin
  249. Some help with output transformers induced hum
  250. Improved Mullard circuit

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