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


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  1. PPIMV Schematics?
  2. Calculation/selection of zener diode ratings
  3. Can my amp suddenly become extra sensitive to single coil hum?
  4. 15 watt tube amp and 15 watt celestion blue speaker
  5. Princeton Tone Pot
  6. Recommend me a Preamp tube
  7. NOS tube help
  8. Interstage feedback resistor
  9. Question about tying cathodes and using the same resistor and bypass cap
  10. 2 amps in stereo : humming/buzzing
  11. input resistors and guitar volume pot
  12. Speaker cab wiring question
  13. Unknown OPT question
  14. Effects of Speaker Rating vs. Amp Output Rating
  15. Can I leave the Bias Current Resistor In the amp permanently?
  16. PRRI Question: Odd Harmonic Buzzing
  17. Plate voltage question
  18. changing tubes...need help
  19. 60 Hz hum in a Mesa Mark III
  20. Converting 6SC7 to 6SL7?
  21. My Ampeg forgot the words?
  22. Connecting amp to cab- what cable?
  23. Need to test amp, can I use a resistor instead of the MV pot?
  24. Ampeg V-2, NEED HELP!
  25. Mesa Boogie Maverick Reverb Tank problem/need info
  26. Traynor YGM3
  27. Who made this 6v6 ?
  28. MusicMan RD-50 bias question...
  29. Tell me about Buss grounds-- it looks really neat and clean, any drawbacks?
  30. Cap across the PI plates
  31. cold solder joint
  32. '66 Deluxe Reverb cutting out under load...?
  33. Build a lower wattage "2204"?
  34. Pro Junior Rattle / Problem/ Love Thread
  35. Ampeg '65 Gemini I weak trem
  36. Ground loop/iso transformer DI
  37. Basic Electricity PPT on web?
  38. Need help installing weber effects loop kit
  39. Can someone help me with this schematic? (resistance question)
  40. Alright guru's....one more question
  41. Ampeg Gemini II question.
  42. How do i get more clean headroom from my Amp?
  43. JCM800 2204 50w Mark 2 Lead (gut shots)
  44. Amperex Bugle Boy
  45. speaker mismatch
  46. Dead AC30cch help
  47. Allen Accomplice sounding ice-picky
  48. 455 Plate Voltage too high for RCA Black Plates?
  49. Troubleshooting help needed; static
  50. Have any of you used Jameco electronics?
  51. Vox AC30cch smoking...help!
  52. Best Capacitor for Catalinbread DLS mod?
  53. Say I pair a couple of speakers with SPL ratings that differ by, say... 2 dB...
  54. help, my amp is crackling!!
  55. Here's a thread for thanking people...
  56. Broken AC Main on Matchless DC30
  57. Tech question on two amp projects
  58. AB763 Opto-isolator Orientation
  59. My amp wants to kill the new 6l6's
  60. Found some Old tubes
  61. Marshall DSL 401 no sound!
  62. Champ crackling
  63. Fender Tone-Master Clean Channel No Sound Unless...
  64. loud buzz when I plug into return jack in effects loop of Rebel 20
  65. Reverend Kingsnake tube driven reverb -tube sbstitutions?
  66. EL84 vs EL84M problem
  67. Blackface Mod?
  68. Matchless Hot Box- V1, V2 locations
  69. RCA 6L6GC
  70. Changing overall amp tone with cap values?
  71. advice on tube socket placement, (wish I'd asked this earlier)
  72. The Fender Champ: Cap value 2.2mfd at 25v
  73. Marshall Bluesbreaker Issues
  74. Ampeg SVT fuse cap!
  75. BF Deluxe Reverb : What settings are best for the Bass knob and Treble Knob ?
  76. High pass filter in speaker cab?
  77. Does it matter if you use speakers of different wattage?
  78. Soldering connectors for DIY amp to speaker cables
  79. swap EL34s to KT88s in vintage marshall
  80. Reverb pan in head cab question
  81. JCM 900 5881 to 6L6?
  82. "lightning" in a tube?
  83. Recommendations for scope and signal generator
  84. Fender 'The Twin' Problem!
  85. 5881 plate voltage question
  86. Fender Super Six Reverb Questions
  87. What would cause power tubes to not light up?
  88. 5E3 Tweed Deluxe: Changing tone caps?
  89. Fender Amp Head cab ventilation question
  90. Thinking of modifying my Valveking-- but I can't find the neg feedback?
  91. Change 5E3 circuit for cleaner tone and normal volume controls?
  92. Kustom Defender Amp - overheating?
  93. Rectifier tube.... what does it do?
  94. fender cathode bypass cap question
  95. Bogner Shiva Question
  96. Help! What is going on here?
  97. Variable resistor or voltage divider?
  98. brown super trem
  99. What tube will get me closest to a Mesa Branded Sylvania STR-415 6L6GC?
  100. Ok I need some new books to read.
  101. Amp Tech in Las Vegas?
  102. Burn in , best practices with a new build
  103. El34's in Twin
  104. Had to post this-- it's hilarious!
  105. Fender "Custom" Vibrolux Reverb problem!
  106. Amplifier voltage output
  107. 5E7 Biasing issues
  108. '72 Super Reverb blowing fuses
  109. Fender 135W Twin question - - OUTPUT TRANNY Pt. II
  110. the schematic says...
  111. Superlead has a static-y sound, what could it be....
  112. Will somebody please explain the Russian 6N2P tubes to me
  113. Trying to understand Speaker Efficiency
  114. BFDR help....again
  115. Can you run 8BQ5 tubes in a 6BQ5 amp ?
  116. What tonal changes can I expect from a cap job?
  117. Speaker ohm testing
  118. Realistic brand tubes are?
  119. Ampeg Gemini, Throbbing noise & Red Plate
  120. What is it that makes an amp...............
  121. Tremolo ticks on my vintage amp. Help please.
  122. Max plate dissipation of power tubes
  123. bf champ plate voltage
  124. baffling in cabs
  125. Peavey 6505 blows mains fuse with amp on standby
  126. Vibrolux (Silverface) doesn't sound good after re-cap
  127. Convert Bandmaster 6L6 to 6V6?
  128. Blues Jr. Trouble
  129. Is there a way to deepen the tremelo intensity on a Princeton amp?
  130. non polarized filter caps?
  131. Changing my speaker cab (1x12) from 16 to 8 ohms?
  132. Help with Marshall dsl
  133. Replacing tubes in Silvertone 1484 newbie questions
  134. Princeton Reverb II
  135. DRRI went silent
  136. Converting a Super Reverb to a 2x10 combo?
  137. Super Reverb Speaker Question?
  138. Think I fried my speaker -- what else might have fried along with it?
  139. Are mounting holes in speakers universally located?
  140. Bad Output Tranny?
  141. Thanks for your help!
  142. another impedence ???
  143. vintage Orange OR80 bias pot?
  144. Is this worth fixing?
  145. Fender Princeton Vibrato - Weak?
  146. Q's about tube Rectification: GZ34
  147. Musicman Died
  148. Modding epiphone valve special for higher gain and better tone
  149. Shuguang EL84's?
  150. LAB Series L5 buzz
  151. Tolex lifting...what adhesive to use?
  152. Marshall 2061x Stack
  153. 4 ohm output to combo speakers and to a 8 ohm extension cabinet
  154. Tone Difference Between 10'' and 12'' Speakers?
  155. ruby 12ax7 premium select?
  156. mixing an 8ohm and 16 ohm in one cab?
  157. 4 Ohm - 8 ohm Bandmaster Question
  158. Old tube hifi mod into guitar amp?
  159. Amp has no effects loop - gain>delay - what are my options?
  160. 12AT7 balanced for Phase Inverter?
  161. Vox Cambridge 30 - mid 90's - amazing sound but?
  162. Bandmaster TFL5005d to blackface?
  163. Houston Amp Techs
  164. I think i blew up my amp using a Hot Plate
  165. Where can I find this Filter Cap? Importance of the Values?
  166. JCM900 on the bench again
  167. USA made 6L6 identification
  168. What would be a good Kit/Amp for a first build?
  169. Tranny info needed.
  170. Power Transformer Rec. for BF Dual Showman
  171. amp starts out great, then buzzes, then drops in volume!
  172. 1948 Fender Princeton
  173. Planning a build and need help with Ohm's law
  174. 6550 vs EL34 : What should I do about my JCM800???
  175. testing used RCA blackplates?
  176. New mark V, but no sound?
  177. Sources for SS replacement "tube" for GZ43 rectifier tube?
  178. Metro zero loss Effects loop help with switch
  179. Should I drop more coin on my v2 pre amp tube or my power tubes?
  180. Probably a really dumb question...
  181. 'Nother reverb tank question
  182. 6g15 reverb unit
  183. Weber Z-matcher ohm question
  184. Mods to 1940's Phono Amp
  185. DIY 1x12 cabs (EVM-12L and Delta Pro12a) low volume output?
  186. Making an Amp in a Rack enclosure?
  187. Amp bias question - help please
  188. What's the difference between Sylvania's with Red and Yellow Print???
  189. Marshall C5 mods
  190. Rebuilding a Deluxe Reverb
  191. question on wiring ohms for supersonic 4x12
  192. Hiwatt running HOT!
  193. Idea to Cure Tube Rattle in Combo Amp
  194. Anyone build one of these?Jonesamps 3 tube SE Wreck
  195. Marshall Class 5
  196. "Repurposing" old radios and record players?
  197. Schematic help needed please
  198. amp comes on but no sound
  199. Looper pedal for speaker cabs?
  200. complete NOOB looking for direction
  201. Egnater Extension Cab Resistance Question
  202. No sound from a Vox practice amp
  203. Where to find some amp cab hardware
  204. Fender vol pot question
  205. How would I trouble shoot my reverb unit?
  206. 18 watt lite IIB input wiring question
  207. Brown Turds vs. Blue Turds
  208. Realistic 5U4 rectifier tubes question...
  209. Fender Super 60 - "fixed" bias question
  210. Celestion 10" Greenbacks- anyone try 'em?
  211. Amp tech in Irvine/Anaheim/So. O.C. area?
  212. AH!!!
  213. Egnater Rebel 30 problem #2 - just a preamp tube
  214. Help me identify this Siemens 12AU7
  215. fender twin reverb amp tube sticker
  216. Bench
  217. Great but easy mods for a Marshall Plexi
  218. el34 in an 800
  219. Replacing 2 prong on old LP Jr amp...question
  220. Awkward electrical situation!
  221. amp building help
  222. Kustom color options
  223. Princeton Reverb vs. Deluxe Reverb: technical differences
  224. Help me find a transformer......
  225. Replacement 10" for 78 Princeton Reverb?
  226. Bias Question.
  227. Ways to get the Fender reverb channel tone to sound similar to the normal channel?
  228. Trace Vellocette Replacement Transformer
  229. To bypass cap or not to bypass cap
  230. Parts Layout for Gibson GA-25-RVT Hawk???
  231. Bias Probe?
  232. Please can someone put my fears to rest on valve amps
  233. 5F1 keeps frying 10k resistor in the filter section . . . any ideas????
  234. Digitech DL8 acts weird in effects loop.
  235. Who's got Weber 450-100 cap cans; besides Weber??
  236. Refurbing a Silvertone 1482 to Fender Tweed Deluxe
  237. What kind of friggen soldering iron are you using for ground points on the chassis?
  238. Reverb Help!!!
  239. NOS Tubes Burned in Yes or No?
  240. Help with tube identification - Pinnacle EL34 ?
  241. 4x12 re-wiring idea
  242. Bright Cap
  243. Marshall foot spacing
  244. hardwiring a marshall to 120V
  245. Princeton PT
  246. Is it a Champ or Vibro Champ cab ?
  247. tweed champ build ideas
  248. Help! DIY amp build dead end...
  249. Question about voltage measurement
  250. Shorted out a Sylvania 6ca7, do I need a whole new quad?