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View Full Version : Maintenance, Troubleshooting & Repair



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  1. ashdown peacemaker 40 schematic?
  2. Marshall 3520 bass amp help, blowing fuses...
  3. Ampeg SVT-6 Pro reading +64vdc on the speaker output.
  4. Randall RH 200 channels unbalanced
  5. Peavey D Blues
  6. Damn Generators!!
  7. Classic 50 410 sizzle and crackle
  8. please help me troubleshoot a fender fuzz wah reissue pr 739 pedal
  9. Micro phonic EL34's...common?
  10. Bass Potentiometer ?
  11. Vintage amp mod, 12ax7(ecc83) plus 2 ecl82
  12. Jbl eon510 help!!
  13. Peavey Classic 50
  14. Please Help Me Trouble Shoot 64 Bandmaster
  15. Fender amp intermittently "fading out"
  16. 6G7A output section needs help
  17. Modification to Ashdown 5.15
  18. Fender champion 30 dsp
  19. 5E3 noise issues
  20. Help ID transistor
  21. PV Delta Blues and C30
  22. Checkup On A Fender Tone Master 100W Head
  23. Electro music Leslie Unit connection
  24. KT88 failures
  25. 40+60w 16Ω speakers in a 212 cab= sounds bad
  26. ElectroVoice 100M POWERED Mixer
  27. Mesa M-pulse 600
  28. Orange RockerVerb 50 MkII - No Bias Voltage
  29. Problem with Fender M80 Chorus
  30. Reverb Hum in Gibson GA-19 RVT Falcon
  31. Blonde Bassman
  32. Output transformers and power tubes
  33. Mark Huss plexi with 6v6
  34. Marshall YJM100 schematic?
  35. TDA2030A -anyone experienced w this chip? Plus possible related issue
  36. Working on Bugera 6260 amp - Question about Tube Grade...
  37. Randall RH150 volume cutting
  38. JBL EON dissassembly?
  39. Trem help
  40. Bugera 333XL switching problem
  41. Fender Super 210 getting the best of me
  42. Need a new scope. USB scope used with a laptop ??
  43. Rath Amp Retro 50
  44. Alamo Futura
  45. Marshall Lead 12 5005
  46. Hot Rod Deluxe volume loss
  47. Orange OR80 fuse position
  48. Fender Deluxe VM blowing fuses immediately after taking off standby
  49. Grainger Valve Edition 5 Issues
  50. Line 6 Spider 112 50 Watts Problem
  51. Noob wants to work on Crate GX-30M input jack
  52. Variac carbon brush replacement
  53. Problem with high mAs...
  54. power transformer for Hiwatt Buldog Bass 20 cheapie amp
  55. Source for replacement 1M dual gang pot for JCM800
  56. Issues with a Acoustic B200H 200w Bass Head
  57. Spectra 225 PWR AMP 550-032 REV C
  58. Old Ampeg V2
  59. Capacitor aging question - Ceramics and Electrolytics
  60. Peavey Heritage Voice Coil rubbing sound
  61. Help/advice with new build poping at hi vol
  62. Mesa Express 2 25 low power?
  63. Goofy Voltages on New Tweed Harvard
  64. AC30TB 1989 Trem Troubleshoot
  65. deoxit? NO!
  66. Quiet Fans?
  67. Macro-tech 5000vz
  68. Amp Fuse
  69. Peavey Bandit-75 possible problem with distortion channel
  70. Marshall MA50 head no sound
  71. Oscope ?
  72. Crate GX-212 power amp puzzle
  73. Discharging Caps
  74. Ampeg V4 B H Imstumped
  75. Mesa Boogie MARK III
  76. DC on input jacks?
  77. Filament PT for Peavey 5150 needed
  78. Fender Red Knob Twin increases hum connecting preamp out and/or poweramp in
  79. blues deville sounds blah and thin
  80. 2004 Fender HRDlx Volume Loss
  81. Premier 120 screech
  82. 1st gen Krankenstein high pitched squeal
  83. Fender '65 RI Deluxe Reverb making noise
  84. Kustom 250 Tremolo Issues
  85. HRDlx Footswitch switches
  86. Fender Bassman 150
  87. Ampeg BA155 HPT How to open speaker enclosure
  88. RoHS and tubes
  89. Most common parts...
  90. Marshall AS100D Acoustic Amp reading -vdc on the speaker output(s)
  91. Stage 112se amp issues - revisited?
  92. SVT-2 Pro: Hum when Input UNplugged; SNARL coming out of STBY
  93. Peavey VTM 60...Lost Heaters?
  94. Hot Rod Deville III V1 reverb noise
  95. sunn 200s amp help
  96. Fender Deluxe 85 may be blown?
  97. ECC83 in inverter
  98. Fender Pro Reverb AA165
  99. plate voltage creeping up on a 1979 marshall 2203...
  100. Testing capacitor failure
  101. Fender Concert Power trans replacement
  102. Locked thread.
  103. Peavey Classic 50 - cracking and sizzling
  104. Help identify new hum on 2 1/2 year old 5e3 build
  105. Low signal at power tube input grids (Marshall TSL JCM200)
  106. Bugera 333XL - where should these loose resistors go?
  107. Yamaha G50 112 III protection circuit
  108. Ampeg SVT plate voltages
  109. Fender Pro reverb 1966... Real dumb question but I got to ask
  110. Peavey 6505+ 112 blows main fuse
  111. Reducing noise in homebrew amp
  112. Peavey Mace VT ?
  113. Converting a Mesa Boogie Studio 22 (or 22+) from 120 to 240 volts is very easy
  114. Question about digital rotary controls
  115. Aria Pro AG30 tube amp...anyone familiar with
  116. Arc between filament and plate
  117. Marshall TSL100 Channel/Switching Problems
  118. Jc120 channel 2 not working - extra switch?
  119. Classic Tone Transformers ?
  120. Orange Rocker 30 OT Replacement
  121. Crate Vintage Club 50 - advice please
  122. Parts for GK 800RB
  123. Hum balance pot in Marshal 1987x reissue amp emits FIRE
  124. Voltage ratio on this output transformer isn't making sense
  125. Engl Blackmore E650 crackling noise
  126. Sunn Alpha 112 PR
  127. OK New issue with JJ tubes!
  128. Weird, Weird stuff with the PT of a Twin, Secondary Voltage.
  129. Ok so who the heck makes a good 6L6 anymore?
  130. Hartke 3500 - Snap, Crackle & Pop
  131. JCM 2000 DSL100 crackling and popping... sometimes.
  132. Troubleshooting a Champion 600
  133. 4560 IC chips
  134. Peavey Artist VT Fades Out
  135. Egnater tweaker 15 combo has lost the master volume, could use some sugestions
  136. marshall avt150h no sound
  137. How to spec replacement OT?
  138. SVT-2PRO Bias Problem: LEDs stay red on one side
  139. Must find replacement power transformer!
  140. HRD V1 troubles no output? Advice needed
  141. Output transformer issue
  142. 2 questions . How do i test decoupling caps and my output for wattage
  143. carlsbro cs40-60 mk1 output tx issue
  144. Anyone have experience with a Fender Champ 12?
  145. Any procedure to test around an output transformer?
  146. Crate Blue Voodoo BV120H on the bench
  147. Peavey Mace Footswitch LEDs ?
  148. 6G3(-ish) Amp Popping Fuses--Need Ideas!
  149. Finished 6G6 Build - But No Bass Response on Bass CH & Too Much Bass on Norman CH
  150. Marshall 1923C ( DSL 50) blows HT fuse
  151. What could this farty little distortion be caused by
  152. HotRod crappiness
  153. Acoustic B200H Service Manual?
  154. Early 80's roland cube 100- Orange
  155. Line 6 Spider Valve HD100 (Bogner) TROUBLE- No output
  156. Peavey Classic 212 VT
  157. Gibson GA45RVT reverb died.
  158. TOA P2122 Schematic?
  159. Roland Cube 60 intermittent internal popping
  160. Roland re201 echo problem
  161. Edison Professional Powered Speaker System
  162. Vox Cambridge 15 and Cambridge 30 reliability upgrades, mods, and tweaks
  163. Ampeg Portflex B-12XT Power tx
  164. Garnet Mini Bass tremolo repair
  165. Orange 200 thunderverb - tube failure
  166. Fender SRM 6302 PA bad hum
  167. Negative Feedback Question
  168. Marshall Vasvestate VS100R Head
  169. Kustom 4 terminal pots
  170. 12AT7 in Univox U-255R runs scalding hot.
  171. Mesa MkV unusual problem
  172. Matching BJT differential pair
  173. Schematic Help Needed Fender Stage 160 DSP
  174. DIY patch cables, major signal loss - what gives??
  175. Head scratcher: 5150 combo bias mod screweyness
  176. Fender Princeton AA1164 1K b+ dropping resistor cooks
  177. Power amp ok on resistive load, but not with speaker
  178. SWR 400 Working Pro
  179. Vox Cambridge 30 Reverb busted
  180. What the ?????
  181. LM3886T Mute Circuit
  182. Valvetech chassis pics
  183. Fender Twin Reissue - No Power, Good Fuses, Inrush Limiter Seems OK
  184. Bogner ecsstacy help please, tubes red plating
  185. Hughes and Kettner 6L6 Guitar Valve Amp- Oscillation/ Rattle/ Reverb Issue
  186. Is this right?
  187. Orange Thunderverb 50 bias - PLEASE HELP!!
  188. Thank you
  189. Ampeg superbreverb Variable Bias Trem/(vibrato) thump all the time, footswitch good
  190. Fender 75
  191. Behringer Amps and Isolated Jacks
  192. Evans Lapsteel amp Fault
  193. VOX AC30/6 TB problems
  194. Output Transformer works but totally cool
  195. Staticy Woosh when turning off standby, background grit: Rivera Fandango 55
  196. 40 watt Sunn amp sounds great but lacks power
  197. Ashdown chassis removal
  198. Marshall 2020 transformer reliability
  199. BA-115HPT
  200. Recommendations for a good epoxy to repair a circuit board
  201. transitor substitution help
  202. Bias probes ?? UK supplier?
  203. Hartke HA-3500 farty noise
  204. 1959 Superlead sounding bad after can cap job
  205. Weber copper cap rectifier - Blown?
  206. Bogner Shiva - reverb issue
  207. Fender optoisolator tremolo ticking/clicking
  208. 1953 Gibson BR9-GA9 hybrid model Low output volume
  209. usa built blues deville 4x10 footswitch problem
  210. Volume fading in and out on a Peavey Vyper 75w combo amp
  211. jcm900 high gain dual reverb very low volume
  212. Fender Red Knob Twin (1987-1994) aka THE TWIN upgrades
  213. Another -15v supply problem!
  214. Fender the twin (1990's) 250k 16mm PDT pots
  215. scope help
  216. Behringer ACX1000 schem?
  217. Music Man 2165-RD Voltage Issue
  218. Bose System L1 Compact Power Stand
  219. Fender Hotrod deluxe noise like popcorn
  220. Got a Crown CE2000 Semi Fixed, Beginner looking for advice
  221. Mojotone CTS pots?
  222. Re-coating burned through PCB trace coating?
  223. Fender Super Reverb RI heating up
  224. NO CHANNEL 2 on MUCH BELOVED FENDER SUPER CHAMP XD.
  225. Laney VC30 112 bias problem (?)
  226. Reverb Tank reqd foruse as test equipment
  227. Plush P1000s on the bench
  228. Svt3 Pro Mosfets
  229. Gallien-Krueger 700RB
  230. Film capacitor
  231. New reverb tank needed?
  232. Replacement knobs for Champion 110 Amplifier
  233. What does this mod do? VH100R
  234. Cant find a OT for DSL401
  235. Gibson Apollo (GA-95RVT) AKA: Nightmare.
  236. Phase inverter, Mesa Boogie SOB
  237. Marshall JCM600 Head Drive channel low volume
  238. Vibrato channel no sound .
  239. How do I easily remove silicone sealant?
  240. Farfisa compact organ.
  241. Semi noisy carvin cx1272
  242. George L's Speaker cables ?
  243. Looking for ED combo amp schematic
  244. Brand new preamp tubes seem to be bad ?
  245. Bench supply recommendations
  246. How do I make this 'widowmaker' safe?
  247. Cathode bypass caps in Bassman 135
  248. '65 SR tranny ticking
  249. How do I rust new screws?
  250. Scratchy, Popping, Distortion in new Pro-Reverb build.