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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Presonus 16.0.2 power supply -- d16 burned
  2. Identifing the input jack of my amp for replacement
  3. Peavey Classic 30 problems
  4. Fender Hot Rod Deluxe PROBLEM
  5. Fender Pro Reverb Ultralinear - Distortion on Reverb channel
  6. Marshall 2210 Reverb Recovery
  7. Mesa Dual Rec Optocoupler
  8. Line 6 Vetta Combo hard reset
  9. Weird problem....gain leaks thru to output even with master disconnected
  10. 1973 Twin Rev Ticking in Reverb Circuit???
  11. Problem with Fender Deluxe 65 vibrato channel volume
  12. Audio research corp D125 what fet to buy
  13. Tc electronics bass amp p/s switching problem
  14. Marshall JCM2000 Dsl board problems
  15. EL-84 6G9 Tremolux issue
  16. Fender Supersonic 60 combo Question
  17. Mesa noise
  18. Line 6 Vetta
  19. Silvertone 1474 Resuscitation
  20. 64' Vibroverb Service Manual?
  21. Princeton Reverb Clone Build Hum Problem
  22. JTM45 build, static
  23. Fender "The Twin" Switching Channel Not Working ?
  24. Roland JC 120- Got it back after 20 years!! I need a bit of help/advice....
  25. BF Fender Vibrochamp questions
  26. JBL EON 515XT Dead
  27. Marshall JVM 205H speaker jack
  28. Mesa Triaxis - no switching outputs
  29. Acoustic 270 voltage on output
  30. Ampeg SVT 6 Pro shorted supply?
  31. Am I going to Hell?
  32. What's your favorite Hi voltage electtro can cap ??
  33. Marshall jcm 900 SL-X 2100 Preamp Problem
  34. What caps do you use to recap a V4
  35. Blues Jr III Anomaly
  36. Peavey 400BJ
  37. Ampeg BA-115: What is the acceptable DC output voltage?
  38. How to figure out Primary wiring without a color code guide
  39. Strange oscillations in speaker... Tremolo at fault or bad tube?
  40. Fender Excelsior - no output
  41. EVH 5150 III channel switching problem
  42. TL072 replacement
  43. '67 Bassman Resurrection
  44. Ampeg VL-1002 Effects Loop Hum
  45. Another rookie repair fixed right
  46. 1979 Mesa Boogie MK 1 Recap
  47. kustom defender v50 bias check/adjust
  48. Marshall DSL201 OT question...
  49. HRD OT test procedure
  50. Marshall TSL 2000 heater voltage question
  51. Acoustic B410 mkII tweeter
  52. A tale of two Gallien Krueger 400RB heads
  53. Marshall MB4410 output only onheadphone jack
  54. Low volume on clean channel. Marshall Valveste AVT 50 X. Please help.
  55. Repair procedure question
  56. DOH! Lighted Marshall power switch got me
  57. New Members: Please read this before posting questions about amp repairs
  58. Fender FM 65R slight noise at turn on
  59. Gibson GA25RVT Chassis Shots, Parts Lists?
  60. Crate V3112 Troubleshooting
  61. Fender FM 65R Reverb tank question
  62. BF fender twin reverb odd power drop
  63. Sprague Tel-Ohmike TO-6A
  64. Matching tubes/ valves
  65. 1961 Bassman
  66. Epi Electar M 1260
  67. Gallien Krueger 250RL Setup procedure questions.
  68. Fender twin - evil twin - pulsating tube
  69. Fender 400 PS bias
  70. Ampeg BA-115 HP Tweeter Issue
  71. Crate GX-15 not outputting sound anymore
  72. Traynor YBA-2B Chassis Mystery
  73. Marshall VS100 Combo Terrible Fizz Sound When Playing
  74. Bolts......Argh! Bugera V22
  75. Ashdown MAG200 Dead - Blown Main Fuse
  76. Roland Cube 40 Repair advice needed
  77. Strange oscillation?
  78. Help with weird buzz
  79. Fender Twin of the ProTube (sometimes called the Evil Twin) with very low output
  80. Classic 30 No preamp tube power - help debug!
  81. Marshall AVT150 TDA7293
  82. Modded my Fender Stage 112se to 2 external speaker outputs. Did I do this correctly?
  83. Fender Frontman 25R wont channel switch, need schematic
  84. Line 6 Spider 4-75 Master volume groaning?
  85. Mesa Solo Head 100 Dual Rectifier - No Sound
  86. Eden NC 320 Bass head
  87. 1963 Fender Twin, Tonally Impaired. Assistance appreciated.
  88. Mind print DTC Tube compressor calibration fault
  89. late 70's UL super reverb speaker impedance
  90. Line 6 Spider 3 150 'black box syndrome'. Anyone found a definitive cure?
  91. Mesa Boogie 50 Caliber + head noise problem
  92. Calrec QF3774 push button
  93. Peavey Bandit - living up to its name
  94. Roland KC350 - Tapping into power amp question
  95. Hotrod Deluxe Reverb/switching supply problems
  96. Acoustic G100T needs help
  97. Vox AC15C1 blowing HT fuses-need official schematic and advice
  98. Isolation Transformer Process
  99. Ampeg B 15S heater issue
  100. Peavey Classic A Series Voltages Indicated on the Schematic
  101. SWR WorkingPro 12 not powering up, not blowing fuses
  102. Blues Jr III and self repair gone wrong.
  103. What's Your Favorite Heater Wire?
  104. '68 Bandmaster Reverb- one tube red plating-then fuse blows
  105. Ht fuse replacement for marshall jcm 800 2205: Fast blo or slow blo??
  106. Hot Rod Deluxe low vol distortion
  107. Sunn Beta Lead Q6???
  108. No sound until volume cranked
  109. Anyone Done Any Mods To The M80's Horrible Overdrive Channel?
  110. Acoustic Control 260
  111. Fender M80 Rated Output Test? Feel Like Amp Is Anemic?
  112. Biasing a Marshall JCM 800 2205 Amp with a simple multimeter! Pin 1 and 3??
  113. Need help finding vintage guitar amp power transformer
  114. Crossover
  115. Marshall 2098 Running Hot
  116. Peavey VK 100 need less on 1 cabinet
  117. Gibson Hawk tremolo problem
  118. VOX Night Train 15 NT15 Volume and Noise Issues
  119. Two Fender Frontman 212R same issue
  120. Looking for an amp tech near Hermitage PA
  121. Potentiometer manufacturer
  122. GK MBEIII Limiter problem
  123. Gallien-Krueger Backline 210 Distorting
  124. Marshall MG15dfx - no sound on clean channel plus part I.D.
  125. EA Iamp300
  126. Damaged retainer pin on v3 of 1989 jcm 800 2205
  127. marshall vintage modern?
  128. Fender Ultimate Chorus issue
  129. Mackie TH-15A
  130. Orange AD30HTC: No sound. (new OT and voltages in spec)
  131. Marshall JTM 45/100 reissue hum problem
  132. Mesa Boogie M9 Carbine
  133. Fender Twin amp noise
  134. Hughes & Kettner Tubemeister 36 schematic
  135. Ampeg B2R Protection Engaging
  136. Fender Hot Rod Deville Amp
  137. Peavey 6505 Plus Channel Switch Popping
  138. Another shop rate question
  139. Trainwreck Express clone, power amp troubles
  140. Egnater Rebel 20 Mk I - Blown PT
  141. Fender Silverface Twin Bias Question
  142. Roland Again
  143. Supro 1624 amp kit
  144. Kustom K 100 Runaway hum in reverb caused by mechanical coupling to cab - fixes?
  145. How much bacground hum or noise is acceptable in a JCM 800 2205
  146. Original high quality potentiometers, tube sockets and input jacks for JCM 800 2205
  147. Gorilla GB-30 Bass Combo Power Supply Issue
  148. Vox AC4 blowing main fuse. done stuff, need more help
  149. Intermittent red channel light blinking and volume loss on 1989 Marshall JCM 800 2205
  150. Fender Deluxe Reverb speaker jack question.
  151. VOX AC10C1 reissue giving me fits
  152. Fender bassman 135 biasing
  153. Mackie 408M EQ pots
  154. Peavey Valveking 112
  155. Peavey XR600b with 400b/g output board OT replacement questions
  156. Bassman AB165 static
  157. Roland DB-500 no sound
  158. Audio research corp D125 Hifi valve amp
  159. Carvin V3 - perplexed
  160. Confession of a rank amateur tube amp repairman
  161. Ampeg ET-2 no Reverb
  162. Fender Quad reverb. Reverb issue.
  163. Vox AD50VT no sound ?
  164. Weird fault in Marshall 100V model 8100. Advice appreciated!
  165. Three channel The Twin schem?
  166. Switching problem in Fender Twin red knobs (the Twin)
  167. Ampeg SVT-6 Pro Help Please
  168. Help finding this pot
  169. Crate GTX65 HELP!
  170. 1967 Fender Bassman AB165: Oscillation on Normal Channel w/ bright switch engaged.
  171. Peavey SJ6357 substitution
  172. JCM 900 2100 SLX Bias Problem
  173. Marshall AVT100 Valvestate 2000 PCB switch
  174. Transistor ?
  175. That darn MG100DFX "output module"!
  176. Early Mackie SRM 450 bias adjustment.
  177. Blue Junior Hum even with all controls at zero - help with PD, please?
  178. PRRI: Rewiring reverb send/return & verb/trem footswitch to original layout???
  179. Resistor replacement threshold
  180. Two '77 Fender Twin issues
  181. Grounding of Switchcraft Tip Shunt jacks
  182. Roland JC-120H
  183. egnater vengeance Mod reqd
  184. Silvertone 1484 Output Transformer Troubleshooting
  185. Homemade amp only hums with volume turned down
  186. Hot Rod Deluxe low power amp output
  187. Ampeg SVT-4-Pro cutting out apparently on high notes
  188. Hot power tubes on Silvertone 1482
  189. Fender Hot Rod Deluxe III
  190. Friedman BE-100 Marshall style goes into standby with Channel Selector
  191. Divided by 13 flatulent distortion (like a broken speaker)
  192. Fender 68 Custom Deluxe Reverb
  193. warning
  194. Marshall JCM900 PC Mount Channel Switch
  195. Gretch 6162 reverb pan replacement ?
  196. Peavey Classic 100 dead head.
  197. Marshall MG100HDFX with uncontrolled gain control
  198. Ampeg SVT vintage model issue
  199. Hot Rod Deville (USA) - what does this mod do?
  200. GK 800RB repair
  201. Crate PA-B8350 Op Amp question
  202. Jbl prx series makes noise
  203. 18W Plexi clone multiple issues
  204. api mic pre amp - low gain fault
  205. Fender Deluxe 112
  206. Trace Elliott 1215 in Protect mode
  207. Fender Deluxe Reverb AB763 reverb pot adding gain/mids?
  208. Substitute for IRFP240
  209. Wharfdale PM700 SMPS intermittant turn on
  210. Identifying Power Transformer leads for FENDER Amp
  211. Generic answer to "blew a fuse" questions
  212. Premier 88 crossover
  213. Ampeg VL-502 EL34 bias voltage
  214. Ampeg PF350 dead PSU?
  215. Ampeg PF350 dead PSU?
  216. Workingman's 15 blew a fuse when turned on. (help me troubleshoot?)
  217. Laney VC15, treble control knob has decided to become an inverse volume control?
  218. JJ Tubes EL34 failing too early
  219. Ampeg SVT 3 pro snapping and popping sounds
  220. Randall short
  221. Marshall AS50R cutting out when I touch a switch
  222. Silvertone 1484 Hiss issue
  223. Allen & Heath PSU goes bonkers!
  224. 1959 Fender Tween Twin 5F8-A Power Supply Questions
  225. New request for "Triggerman 100h" or Grainger copy front-end sschematic
  226. Polytone minibrute
  227. 1961 Ampeg Revererocket R12R tremolo not working.
  228. Marshall JCM800 4010 - explain these circuit tweaks
  229. Bassman 250 help
  230. Duoverb 100 watt head
  231. Marshall 5215 preamp issues
  232. Ampeg BA115HP low volume
  233. Capacitor question VL503
  234. Hartke HS1200
  235. Bias issues with new 6G2 build... WAY low current draw from power tubes - huh?
  236. DSL 401
  237. Need help with my marshall mg100fx
  238. 1973 Fender Twin Reverb Speakers cutting out.
  239. Yamaha T100 Distortion Pull switch
  240. UV diagnostic
  241. Ampeg VL-503.......Need Help!
  242. Today's "Strange Question"
  243. Crate PA-B8350 Mixer
  244. aVT 50
  245. OT transformer secondary issues
  246. Dr Z Mini hum?
  247. Peavey Decade amp, noisy pots, replaced with new, still noisy?
  248. 1959 Gibsonette Audio transformer impedance matching
  249. Peavey Studio Pro 50: Burned power supply
  250. Puzzling Power Supply Voltages on Crate PA-B8360