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View Full Version : Amps/Cabs Tech Corner: Amplifier, Cab & Speakers Tech Discussions


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  1. Tube covers in fender amps?
  2. How to measure the in/out impedances for reverb line?
  3. how to connect a 240V hammond transformer???
  4. Dumb question... Whats the danger in installing tubes and not rebiasing?
  5. I need Schoolin', re FilterCap Discharge & MM
  6. Software Signal Generator & Oscilloscope; any good?
  7. who knows the Mesa OT color code?
  8. Phillips EF86 real or Fugazi?
  9. RFT EF86 or is it
  10. Hissing sound from a Fender Twin
  11. Tube Dampers--- Why?
  12. Comments on Fender amps, "Pete Anderson"
  13. How tough is it to build a new efx loop for an amp?
  14. Can I Use a Different 12A?7 For a P.I.?
  15. popping sound on my high powered twin, true bypass pedals only
  16. 100 OT 50 watt PT
  17. What is a going rate for Kalamazoo Model1 cap job?
  18. switching a leslie on and off using ac current
  19. 1969 Fender Silverface Blackline Bandmaster-What Circuit?
  20. Need help finding some parts for a Concert II 80s
  21. help with a DRRI Reverb
  22. princeton reverb woes
  23. Power tube life
  24. '72 or '73 Bandmaster Reverb
  25. wet/splatty distortion overtone from my new Bruno...
  26. Problems with Fender Hot Rod Deluxe
  27. What Should I Get Done - '73 Traynor YGL-3 Mark 3
  28. Question to Change 2-3 prong plug on 68-69 Gibson Duo Medalist
  29. Help identifying these EL34s??
  30. Building a "Brown Box"???
  31. LED for Reverb/Tremolo Footswitch on Deluxe Reverb?
  32. Caps in AB165
  33. filter choke option
  34. Amp Cabinet Swap
  35. Correct Fuse for Fender 67 SF Deluxe Reverb
  36. looking for a project...
  37. 1974 marshall 1959 power transformer
  38. Is a 30ohm load safe for my amp?
  39. Broken Mesa Mark 3, Please help!
  40. fender super reverb not working.
  41. Anybody put a Master volume on a plexi Marshall?
  42. Can any one tell me why? (Fender PA 100)
  43. ab/y hum between amps
  44. Stage gain and clipping levels in tube amps
  45. Ampeg J-20 handwired . .bias ?
  46. Rack gear for dummies!!! Please Help!!
  47. Torn speaker cone repair?
  48. Adjusting Trem Depth in Princeton Reverb Build
  49. What amp to build using 6BQ5 tubes
  50. Tubes, do they have to be vertical?
  51. Prolonging the life of vintage transformers?
  52. Ooooohms My God!!!!!
  53. DRRI distorting.
  54. Midi channel switching
  55. rectifier???????????????caps???????????
  56. Super Lead / Hotplate / Cab Question?
  57. Fender dual showman Jump the channels?
  58. Pulling a preamp tube in a Dual Showman
  59. Output bias shift under overdrive?
  60. MM HD130-212 12ax7 ?
  61. I want to make my marshall-esque amp a bit more Fenderish
  62. Peavey classic 30 effects loop problem
  63. If I wanted to learn how to build an amp, which books/resources?
  64. Channel switching problems
  65. Need a little advice installing new baffle in SF Deluxe
  66. Diagnosing a sick amp....
  67. speaker wire with 1/4 plug and female terminal
  68. blackface tremolo optocoupler question
  69. Amp Gurus-Circuit board placement
  70. Theoretical Q about a short circuit on a PCB.
  71. Clipping the 'Brite Cap'?
  72. Vibro Champ Bias Resistor
  73. wiring speakers in a vintage ac30 help please
  74. quick PA questions!
  75. REPOST: strange sound from bass amp
  76. Did I get stiffed on my new EL34 matched quads?
  77. Stripped Blues Jr.........Plexi
  78. Ampeg j 20 problems...
  79. 6L6 to EL34
  80. 66 Vibrolux Reverb - Rectifiers
  81. Help: Heritage Briton's Fading
  82. Rivera Fender 'Concert II' blowing fuses.
  83. Punctured Speaker
  84. Coax-where and how?
  85. 2 6L6 Se
  86. Help with hot rod deville break down please!
  87. EL-34 1987x to cathode bias?
  88. Music Man control grid voltage ?
  89. Blues Deville distortion thoughts??
  90. triode/pentode switch for vibro-king?
  91. How loud to overdrive an SM57 ?
  92. yellow jackets or attenuator
  93. Reverb not working on Bandmaster Reverb
  94. Calling all Ampeg J 20 owners
  95. JCM800: Soft crackling sound in background when playing on lower strings
  96. tweed champ rattle
  97. coupling caps, tweed champ, less bass?
  98. Reversing the LED in my footswitch
  99. Anybody have a pic of a Fender Concert IIs input jack wiring?
  100. Matching speaker watts/ohms.
  101. Fast amps slow amps
  102. Getting parts for Machless Spitfire clone.
  103. Help! Amplifier noise question. Squeal, oscillation, ???
  104. Do tubes still warm up in standby mode?
  105. Would it be possible to build a speaker that....
  106. Peavey Rockmaster dull?
  107. Bad rectifier tube?
  108. Speaker Connection Question
  109. Bassman 50, unusual power cord mod?
  110. Help a Noob. Can't find a part on Mouser...
  111. amp teck help needed!!!!!
  112. Another Alchemist thread (bias check)
  113. Another grid-to-ground tone robbing cap? (A1270)
  114. Reducing transformer hum - some questions
  115. Clicking/ticking noise w/ Tremolo on my Ampeg Gemini G-12
  116. turn bright switch into tonestack disconnect on Fender amps
  117. Fender Deluxe Reverb RI Mods?
  118. Val-trem restoration project
  119. MTS3212 Repair?
  120. Acoustic into an electric guitar amp
  121. The Deluxe Reverb as a Toaster Oven...
  122. Wood Circuit Board ??
  123. PI tube, distortion and perceived loudness
  124. Johnny c the boneshakers
  125. Vibro Champ Bias / Speaker
  126. Tweed Amp Help
  127. Fender Super 60 pots replacement
  128. Well I have been offically sucked into this fourm
  129. Turning up the preamp volume: what's distorting?
  130. Matchless DC-30 12ax7 channel
  131. Ground loop problems..
  132. draining caps on a 1965 bandmaster
  133. 8 ohm VS 16 ohm
  134. Testing Tubes?
  135. Best/Fav P/P Design for Mesa Subway Donor
  136. "fuzz/buzz" overtone on clean channel
  137. Multimeter experts-Biasing a Super Champ XD scxd-need help
  138. Hammond PT & OT recommendation for 5e3 home build?
  139. Ohms help for a power amp please!
  140. Bias help on new PRS Sweet 16
  141. Really dumb amp repair noob question
  142. Power tubes Matched duet but different make - is it safe?
  143. Matchless DC30 schematics available
  144. Mullard Batch Numbers ?
  145. Fender Blues Junior reverb issue?
  146. Why would a 12AY7 cause my head to get really hot?
  147. Buying NOS tubes from ebay.
  148. negative feedback
  149. Bumbox Lead One
  150. Leslie 122 speaker problem
  151. Matched Ruby's V's Unmatched Mullards Originals
  152. JCM 800: Strange sound - where to look for problems?
  153. speaker ohm question
  154. Class D amps?
  155. Fender Custom Vibrolux Reverb..Noisy!
  156. Traynor Bias
  157. rectifier tubes
  158. victoria victoriette tube choice
  159. "clear" amp chassis
  160. Tweed Champ OT Swap
  161. What does the "V" mean when used with tubes?
  162. Champ II output transformer swap?
  163. tuning a speaker cab
  164. Brown Gunk on stock Mesa EL-84s, what is it?
  165. DRRI sounding thin and brittle after couple of hours playing
  166. Another Boogie Bias Question
  167. Question to all "Fender Super 60" owners !!!
  168. Change preamp tubes with amp on?
  169. What happens when I… (two questions)
  170. Tubes for my Super Champ???
  171. help with a fender showman
  172. Help troubleshooting noise in Super Reverb
  173. Converting a 5E7 to EL34s
  174. characteristics of 5881 tubes.
  175. Need help understanding & tweaking 5F4 tonestack
  176. Redplating Tube--Bad tube?
  177. Attention Schematic Readers...
  178. Soldering to traces
  179. what affect does voltage/electricity have on amp sound?
  180. TGPers first choice to buy tube son line...
  181. Retubing the Bogner Alchemist
  182. '65 or '66 Super Reverb
  183. capacitor choices
  184. another capacitor question
  185. Music Man Bias Findings .
  186. Capcitor discharge on its own?
  187. Bias Probe for EL84's?
  188. Upgrading Tranformers
  189. background noise in Mesa DC-3 - help needed!
  190. Oversized Capacitors
  191. Ted Weber has passed on
  192. Hum issue.
  193. amp problem; clean channel sounds distorted
  194. New book on amplifier design and construction
  195. victoria Victoriette set up
  196. Just picked up a Sonotone 6aq5 on e-bay
  197. 6L6s to 6550s, will output impedance change?
  198. How to remove Bandmaster Reverb Pilot light nut?
  199. Impedence Mismatch question
  200. Just blew up something in my SF vibrolux reverb
  201. How to figure bias for my amp
  202. What is typical plate voltage on a SF Pro reverb??
  203. Ampeg VT-60 bias issue.
  204. any way to tell what model fender amp....?
  205. Idea-- Faraday cage around PT?
  206. Cap can replacement
  207. Help - went to a "tech" with my Bassman.
  208. footswitch wiring help?//
  209. Prosonic - Hum. Help.
  210. Heater wiring question
  211. Do Transformers Really Sound That Different?
  212. My amp is rated at 16 ohms my cab is 8
  213. Marshall JCM 2000 DSL - Channel "A" Barely audible? - HELP
  214. speaker switch
  215. Vintage Gibson GA-40
  216. 12AT7 instead of 12AY7 in Tweed Deluxe?
  217. sjb hornet
  218. What Brand of Filter Caps Are These?
  219. Who makes Victoria's transformers?
  220. Biasing a Silvertone 1484
  221. Fender DRRI: Reverb Decay is Unusually Long
  222. KT66 vs. 6L6
  223. weird Polytone problem ?
  224. My Beloved Weller WTCPL ....
  225. I want to Upgrade my Output Transformer - suggestions please.
  226. red plating el84
  227. Modded Blues Junior has no output
  228. Capacitance Meter Recommendation
  229. Filter Cap Question
  230. Why no Stand-by switch?
  231. Tweed 5E5-A (5F4) Screen Grids
  232. How hard is it to rebuild an effects loop for an amp?
  233. Twin Reverb - Odd Sound
  234. Do all 50 watt Class A/B amps have the same amount of clean headroom?
  235. Swooshing Standby Switch Help
  236. Strange 5E3 amp static?
  237. removing the polarity switch
  238. Please give me the crash course on a Variac
  239. Serial FX loop switchable signal attenuator
  240. Mods to bump a SF Champ up to 10W?
  241. '52 Gibson GA-40 Bias Setting Help - Hi Res Pics
  242. JTM45 experts, I need your help!
  243. Broken Tube Key and related issues
  244. Impedance selector switch rating
  245. OT into Short
  246. Best Transformers for Brown Deluxe 6g3
  247. Debugging Danelectro reverb
  248. Any insight into SkipZ power Scaling?
  249. Pulling two tubes from a Twin Reverb?
  250. Using two output transformers together