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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Orange AD30HTC: No sound. (new OT and voltages in spec)
  2. Marshall JTM 45/100 reissue hum problem
  3. Mesa Boogie M9 Carbine
  4. Fender Twin amp noise
  5. Hughes & Kettner Tubemeister 36 schematic
  6. Ampeg B2R Protection Engaging
  7. Fender Hot Rod Deville Amp
  8. Peavey 6505 Plus Channel Switch Popping
  9. Another shop rate question
  10. Trainwreck Express clone, power amp troubles
  11. Egnater Rebel 20 Mk I - Blown PT
  12. Fender Silverface Twin Bias Question
  13. Roland Again
  14. Supro 1624 amp kit
  15. Kustom K 100 Runaway hum in reverb caused by mechanical coupling to cab - fixes?
  16. How much bacground hum or noise is acceptable in a JCM 800 2205
  17. Original high quality potentiometers, tube sockets and input jacks for JCM 800 2205
  18. Gorilla GB-30 Bass Combo Power Supply Issue
  19. Vox AC4 blowing main fuse. done stuff, need more help
  20. Intermittent red channel light blinking and volume loss on 1989 Marshall JCM 800 2205
  21. Fender Deluxe Reverb speaker jack question.
  22. VOX AC10C1 reissue giving me fits
  23. Fender bassman 135 biasing
  24. Mackie 408M EQ pots
  25. Peavey Valveking 112
  26. Peavey XR600b with 400b/g output board OT replacement questions
  27. Bassman AB165 static
  28. Roland DB-500 no sound
  29. Audio research corp D125 Hifi valve amp
  30. Carvin V3 - perplexed
  31. Confession of a rank amateur tube amp repairman
  32. Ampeg ET-2 no Reverb
  33. Fender Quad reverb. Reverb issue.
  34. Vox AD50VT no sound ?
  35. Weird fault in Marshall 100V model 8100. Advice appreciated!
  36. Three channel The Twin schem?
  37. Switching problem in Fender Twin red knobs (the Twin)
  38. Ampeg SVT-6 Pro Help Please
  39. Help finding this pot
  40. Crate GTX65 HELP!
  41. 1967 Fender Bassman AB165: Oscillation on Normal Channel w/ bright switch engaged.
  42. Peavey SJ6357 substitution
  43. JCM 900 2100 SLX Bias Problem
  44. Marshall AVT100 Valvestate 2000 PCB switch
  45. Transistor ?
  46. That darn MG100DFX "output module"!
  47. Early Mackie SRM 450 bias adjustment.
  48. Blue Junior Hum even with all controls at zero - help with PD, please?
  49. PRRI: Rewiring reverb send/return & verb/trem footswitch to original layout???
  50. Resistor replacement threshold
  51. Two '77 Fender Twin issues
  52. Grounding of Switchcraft Tip Shunt jacks
  53. Roland JC-120H
  54. egnater vengeance Mod reqd
  55. Silvertone 1484 Output Transformer Troubleshooting
  56. Homemade amp only hums with volume turned down
  57. Hot Rod Deluxe low power amp output
  58. Ampeg SVT-4-Pro cutting out apparently on high notes
  59. Hot power tubes on Silvertone 1482
  60. Fender Hot Rod Deluxe III
  61. Friedman BE-100 Marshall style goes into standby with Channel Selector
  62. Divided by 13 flatulent distortion (like a broken speaker)
  63. Fender 68 Custom Deluxe Reverb
  64. warning
  65. Marshall JCM900 PC Mount Channel Switch
  66. Gretch 6162 reverb pan replacement ?
  67. Peavey Classic 100 dead head.
  68. Marshall MG100HDFX with uncontrolled gain control
  69. Ampeg SVT vintage model issue
  70. Hot Rod Deville (USA) - what does this mod do?
  71. GK 800RB repair
  72. Crate PA-B8350 Op Amp question
  73. Jbl prx series makes noise
  74. 18W Plexi clone multiple issues
  75. api mic pre amp - low gain fault
  76. Fender Deluxe 112
  77. Trace Elliott 1215 in Protect mode
  78. Fender Deluxe Reverb AB763 reverb pot adding gain/mids?
  79. Substitute for IRFP240
  80. Wharfdale PM700 SMPS intermittant turn on
  81. Identifying Power Transformer leads for FENDER Amp
  82. Generic answer to "blew a fuse" questions
  83. Premier 88 crossover
  84. Ampeg VL-502 EL34 bias voltage
  85. Ampeg PF350 dead PSU?
  86. Ampeg PF350 dead PSU?
  87. Workingman's 15 blew a fuse when turned on. (help me troubleshoot?)
  88. Laney VC15, treble control knob has decided to become an inverse volume control?
  89. JJ Tubes EL34 failing too early
  90. Ampeg SVT 3 pro snapping and popping sounds
  91. Randall short
  92. Marshall AS50R cutting out when I touch a switch
  93. Silvertone 1484 Hiss issue
  94. Allen & Heath PSU goes bonkers!
  95. 1959 Fender Tween Twin 5F8-A Power Supply Questions
  96. New request for "Triggerman 100h" or Grainger copy front-end sschematic
  97. Polytone minibrute
  98. 1961 Ampeg Revererocket R12R tremolo not working.
  99. Marshall JCM800 4010 - explain these circuit tweaks
  100. Bassman 250 help
  101. Duoverb 100 watt head
  102. Marshall 5215 preamp issues
  103. Ampeg BA115HP low volume
  104. Capacitor question VL503
  105. Hartke HS1200
  106. Bias issues with new 6G2 build... WAY low current draw from power tubes - huh?
  107. DSL 401
  108. Need help with my marshall mg100fx
  109. 1973 Fender Twin Reverb Speakers cutting out.
  110. Yamaha T100 Distortion Pull switch
  111. UV diagnostic
  112. Ampeg VL-503.......Need Help!
  113. Today's "Strange Question"
  114. Crate PA-B8350 Mixer
  115. aVT 50
  116. OT transformer secondary issues
  117. Dr Z Mini hum?
  118. Peavey Decade amp, noisy pots, replaced with new, still noisy?
  119. 1959 Gibsonette Audio transformer impedance matching
  120. Peavey Studio Pro 50: Burned power supply
  121. Puzzling Power Supply Voltages on Crate PA-B8360
  122. Removing knob from switch on Roland JC77
  123. Hartke A70 loud click when switch on and noisy
  124. Markbass Little Mark II
  125. Missing cap in Fender Deluxe 112
  126. Annoying noise in Dual rectifier 3 Channels (with solution).
  127. Ampeg SVT II Pro protect circuit
  128. Marshall VS100 motorboating..
  129. Mesa boogie DC-3 need help
  130. Hot Rod Deluxe II Buzzing & Hum
  131. Sessionette 75 - fault
  132. Marshall DSL40C (new version)
  133. Acoustic model 320 issues
  134. Help identify signal path in pcb relay
  135. Fender Power Chorus Transistors
  136. peavey duel 212 no output
  137. Quad 34 power switch
  138. Put a 100K resistor in series with the potenciometer wiper?
  139. Old Aussie amp problems
  140. Starting fresh DIY on JC-80
  141. QSC 1400
  142. Lectricare over Deoxit products?
  143. B-52 ATX 100 biasing
  144. fender 65 twin reverb reissue making siren noise after replacing all preamp tubes
  145. yamaha T100 low output on the gain channel only
  146. Bulb across OT primary?
  147. Vox AC10 Hissing/Buzzing/Gargling
  148. 1959 Twin 5F8-A B+ Caps Considerations
  149. JC-120 Chorus Question
  150. Marshall 1959T (year1969) problem Ghost Notes
  151. Echolette M40 , how to get rid of parasitic oscillation
  152. Marshall 9200 60Hz Hum & Noise
  153. Differences in tube idle dissipation and what it means at the end of a day
  154. Blown Transistor on Hartke HA1200 (hs-1200 board) for Kickback 12. Any advice?
  155. Rule #1 in guitar amp repair - Check the obvious!
  156. Hum at Zero volume - decreases at mid-point, then more hum...
  157. Bypass Capacitor On Op Amp V+ and V- Pins
  158. Peavey Valveking 112 help needed please.
  159. Crossover Calculator
  160. Telefunken tubes on the market: don't get too excited :/
  161. Guyatone (toyo sound) GA-440 reverb tank in need of repair...
  162. Traynor YGM-3 has tinnitus
  163. Alesis Wildfire 60 - need board
  164. Tremolo comes on for a second and then fades out...
  165. Laney DB300C - power amp blown
  166. BFSR Noise Issue
  167. Fender Pro Reverb - hiss
  168. Tube amp with a part/component I'm unsure of...
  169. Peavey Ecoustic 112 - 12" Coax Speaker - Blown Tweeter
  170. 5f1 hum and squeal
  171. Excessive Hum for Marshall JTM100
  172. Slight channel bleed
  173. Peavey Ecoustic 112 - Loud Hiss
  174. Broken Plastic clip holding On/Off circuit board
  175. Fender Vibrolux Reverb motorboating noise
  176. Yamaha DG60 power transformer help
  177. Behringer BXL 3000 A , hot resistor.
  178. Speaker rattle caused by small debris hidden somewhere
  179. Silvertone 1448
  180. Fender '65 Twin RI crackling
  181. SWR Basic 350 with clipping distortion
  182. Sovtek Mig 60 power transformer replacement
  183. Roland JC120 no chorus
  184. Fender Stage 185 input jack
  185. Marshall 9200 Output Signal Oddity
  186. line 6 spider 3 15watt pot
  187. Marshall 5275 ss combo: no sounds when golng thru input jack, ok thru effects loop :(
  188. Peavey Delta Blues - Mysterious Zener diode in HT supply
  189. Please help me diagnose my possible amp problem. Video included.
  190. VT100 low power / high distortion
  191. PV Nashville 112 Schematic??
  192. Crate V3112 issues, Grounding and hiss in clean channel
  193. Crate GT-200 loud hum
  194. Marshall DSL 50 making me very frustrated
  195. SS 50 Watt Power Amp Making funny noise When Turned On
  196. Causes for 2nd chanel not working JTM60/JCM60
  197. Mackie SRS1500 circuit board.
  198. Mackie SR1530 Transformer
  199. 59 Bassman keeps blowing fuses
  200. Bugera 15v regulators vs heat
  201. Cautious Reminder - Ohio Teen Electrocuted Conducting ‘Jacob’s Ladder’ Experiment
  202. Peavey Bandit Transtube 112 2012 - no reverb
  203. Reel to reel tape?
  204. Roland Cube 60 Keyboard
  205. Crate FXt65 cuts out on clean channel only
  206. Randall RG75 G3 Combo amp
  207. 1972 Fender Bandmaster Reverb
  208. Frankenstein'd Pro Junior build
  209. Premier 88 tremolo not working
  210. Randall RX120R Solid State Treble Fault
  211. Univox U-1011 question
  212. Fender White Noise
  213. Peavey JSX issues...
  214. Ampeg V2 bias question
  215. Output transformer fault or OK?
  216. Source for Peavey 7 pin DIN jack?
  217. Peavey Bandit 112 - MSC 2B DZ89052 diode alternative/replacement
  218. Marshall Mosfet 100- HISS
  219. Noisy mains transformer
  220. DSL bias problem
  221. Hot Rod 3 Bright Switch squeels
  222. Hooked up PT wrong on a 6v6 2204 build
  223. Randall RGT100ES Burned Resistor
  224. Super Six Back Panel
  225. Sovtek Mig100U - Help!
  226. Ampeg V2 - a few quick questions
  227. Fender Showman Plate Dissipation is 0mv
  228. Ampeg SVT-CL zero Ig2 in one tube causes funny readings all over
  229. Bottom Line: Tube Dissipation and its effects on tone
  230. Mesa Boogie Studio 22 Low Output (Unless FX Loop Patch)
  231. Peavey XR8600D output phase issue...
  232. OP AMP question
  233. Marshall JTM 60 problem with gain channel with FX loop
  234. Bugera 333xl (non-Infinium) popping fuses
  235. Markbass Combo head II issue
  236. Smoke coming from amp
  237. Markbass combo head II problem
  238. Ceramic capacitors and working voltage
  239. Peavey 400B module troubleshooting
  240. Roland cube 20 weird constant scratchy wind noise
  241. Best way to check filtering quality of Power/Line Conditioner
  242. Hissy GK 250 ML
  243. Peavey PV10 Mixer Ribbon Cable To Effects Board
  244. Fender Hod Rod Deluxe
  245. In my Vox AC15H1TV resistors R32, R24, R33, R21 different from the schematic !?!
  246. Acoustic Control 150B DC offset issue
  247. fried Peavey 5150 Combo
  248. Roland KC 550 fuses?
  249. Fender BF Bassman AB165 output waveform issue...
  250. Egnater Tourmaster 4100