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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Blues Junior power transformer smoking - can it be rewound ?
  2. Laney bass amp blows output transistors!
  3. Trace Elliot Bass amp repair
  4. Need help diagnosing a 70's vintage PA
  5. B52 Stealth 60W head reverb tank
  6. Ampeg SVT-4 Pro
  7. Weird voltage reading Selmer
  8. WT 400 enhance circuit and di problem
  9. Sunn 300 Coliseum Troubles
  10. general tips for isolating noisy component
  11. What's the buzz on hum in old tube amps?
  12. Fried BF Bassman Heater CT!
  13. SUNN Model T 2nd Gen Power up ?
  14. PEAVEY Special 130 noise problem
  15. Randall RG50TC low low low output....
  16. Repairing Acoustic G60T Amp Head
  17. GK Backline 210 makes crackling noise when playing in low register
  18. Yamaha T50C - need advice
  19. Sunn 200s multicap can, etc. replaced but showstoping problem persists
  20. Strange problem with Peavey Classic 30
  21. Lead Free Solder
  22. Seymour Duncan convertable 60 watt low volume probs ... HELP !
  23. have a better one
  24. 66 Super Reverb no so super sounding
  25. Peavey Valveking volume drop in lead channel
  26. Carlsbro 50Top bias problem
  27. Fender Acoustasonic 30 problem - Noise on Reverb only... HELP?!
  28. Mesa noise?
  29. dying '77 peavey classic 50 212
  30. Unstable Bias, blowing fuse
  31. Peavey Bandit 65 - Sounds awful - looking for some help!
  32. Marshall Valvestate 265 with one channel hum
  33. Nuts for Jacks & Pots
  34. Fender Bassman SP3100 acting weird (again :P ) Cap problems?
  35. bias question
  36. Cerwin Vega BG-250 amplifier, starving output
  37. Y2 Class EMI Suppression Capacitor - "Death Cap"
  38. Crate BV 60 Blue Voo Doo - Master Volume pot replacement.....
  39. Tiny terror trouble
  40. Fender Hot Rod Deluxe- Cutting out and dirty
  41. super reverb earth issue
  42. Marshall AVT 20 Hum
  43. Sano oscillation
  44. Peavey Vypyr 75 question
  45. Peavey 5150 head won't power on!
  46. MusicMan 2475-75 Problem
  47. Blues Junior question
  48. Peavey Encore 65 - need help troubleshooting
  49. Bad Cat Hot Cat ?
  50. Peavey Classic 50 - 212
  51. Marshall 8100 output transistor
  52. Kustom 200 Blowing Fuses
  53. 63 vibroverb reissue--reverb problem
  54. Silicone and others
  55. resurrecting Avometer 8
  56. Fender switching pots?
  57. POG bad DSP?
  58. help with dropping voltages in secondaries
  59. Is my Gibson Atlas blowing up my tubes or am I just unlucky?
  60. Sunn 1200S
  61. 6V6GTA plate dissipation in cathode bias push pull amp
  62. Huge difference in bias readings from tube to tube on matched sets
  63. Mesa/Boogie S.O.B. tube question/idea
  64. Mesa Nomad 45 - Strange Power Transformer Conundrum
  65. Trace Elliot Super Tramp TSC Blowing Fuse's
  66. B-52 AT-100 making vibration sound when palm muting or low notes
  67. 50 watt jmp 76
  68. Marshall MG50DFX sound problem
  69. Roland Cube 60 - Fuzzy Buzz
  70. princeton stereo chorus has bad hum...stumped!
  71. bad preamp tube creating open ground?
  72. Noisy bugera
  73. help with Laney pro tube
  74. marshall valvestate 8100 pot value help!!!!
  75. What would cause high frequency oscillation with neg feedback loop connected?
  76. Broken allen & heath board amp need help finding ec-10n20 mosfet
  77. G-K Backline 250 Head Blowing Fuses, Help Please!
  78. Fender Champ squeals
  79. Fender Pro Reverb Vibrato ticking
  80. Roland JC-120 channel 2 no work!
  81. Problem with Musicman RP-65 (2165-RP) volume.
  82. Peavey Transtube Envoy 110
  83. Ampeg M12
  84. Transformer Current Rating Help
  85. cube 60 broken lead channel
  86. Bassman export amp silverface 1970 circuit
  87. 50 watt jmp
  88. AVT150 (again, sorry)
  89. 69 Fender Princeton Reverb - Vibrato and Tone Stack Issues
  90. Peavey Classic 30 Help
  91. Laney AOR/50 100 - anyone have one ?
  92. bass amp buzzing/distorted
  93. vintage 1960 fender champ volume issue
  94. turned on amp with no PI tube...
  95. Cooked Acoustic 370
  96. Crate Palamino v32 112 Issue
  97. Torres DM200 motorboats on loud notes
  98. PeaveyTMax squeal
  99. Ampeg B15 high plate voltage?
  100. Plate voltage on Valvestate 8080 head
  101. SWR WM 4004 headphone jack resistors
  102. Fender Performer 1000
  103. Hums, ground loops, and strange squeals.
  104. Amp too "honky" !!!
  105. 65 Blackface Bassman
  106. JCM602 heater question...
  107. Ampeg ET-2 Super Echo Twin bias issues...
  108. speaker resistance for Fender Stage 160.
  109. 5F6-A ugly distortion - Direct coupling question
  110. Peavey Butcher won't come off standby
  111. Laney GH50L problems plus I saw my first power tube go down in electrical fury
  112. Ampeg r-12-r-b motorboating
  113. sano low volume
  114. Hartke 3500 EQ Board
  115. Kustom 36' Coupe bias
  116. 60's Gibson Hawk
  117. Blues Deville reissue tone control acts like bass control in reverse
  118. One day mg100hdfx the next nothing...help!?!
  119. Replacement output transformer for Peavey Valveking
  120. SWR 550X- Constant hum issue
  121. Ramdom poping sound
  122. AB763/6G16 Circuitry
  123. Polytone minibrute iv noise
  124. Marshall JMP-1 Tube Preamp Burning Resistors
  125. Peavey Ultra Plus 120W Tube Amp No sound output
  126. EL84 Bias Values, crackling, etc....
  127. 20 amp fuses?
  128. Quieting a noisy fan?
  129. Fender 212r again
  130. Mesa Boogie Heartbreaker popping issue
  131. 7591 Bias
  132. S30-A Bremia Tube amp.
  133. Tech help needed. Different readings between direct plate, cathode & bias probes.
  134. Obscure Guild Maverick Amp (7591's) VERY low volume/not working.
  135. '69 bassman troubles
  136. No plate current, but why?
  137. [rebuild] SUNN A212 Combo
  138. Carvin X100B Reissue Issue
  139. fender rhodes power transistors
  140. does this sound like a bad solder?
  141. Help needed with Frontman 15G input jack replacement
  142. Mackie SRM450 tweeter replacement?
  143. biasing 1966 BFSR
  144. Solved a reverb feedback problem read on to be enlightened.
  145. sound city 50r mk 3 reverb tank
  146. Line6 AX2 Modeling Amp Emits Solid Tone When Switched On
  147. Reducing noise in Carlsbro valve PA head
  148. Fender DRRI OT replacement
  149. Two-Stroke Amp loses volume intermittently
  150. Amp Tech in Gdansk, Poland?
  151. JC 120 went Pfft!
  152. Bugera 6262 combo..here I go again
  153. Marshall Valstate 100r - No distortion
  154. Anybody have a legible TC-142 schematic?
  155. Weird amp hum
  156. Carvin Legacy 100 head arcing issue
  157. Fender Bassman SP3100 "moaning"
  158. Magnatone MP1 help
  159. Peavey Triumph 60 Effects Loop noise
  160. Preamp negative grid voltage, oscillation?
  161. Laney Klipp 60
  162. Kustom PA 300 DC on output and lots of it!!!
  163. Fender Musicmaster Bass amp fuse holder
  164. Vox AC30 reverb model with loud hum(strange AC30 problems revisited)
  165. Fender roc pro 1000
  166. Peavey CS-400
  167. Ampeg V4 distortion model
  168. V-amp problem
  169. SWR Workingman 300
  170. Marshall JCM2000-60W: Serious damage from whiskey spill!
  171. Is this cap cooked?
  172. Soundtronics Custom300 7027 screen resistors?
  173. Please help me troubleshoot my Roland JC-160!
  174. Wierd Blues Jr problem-helps
  175. 5150 combo keeps blowing fuses
  176. gibson g20 troubleshooting help
  177. Marshall JCM 2000 DSL
  178. VOX AD100 motorboating / machine gun sound out of nowhere...
  179. Pictures of wiring, ab763 reverb parts
  180. peavey triple x head problem with effects loop
  181. Power transformer--how hot is too hot?
  182. Makeshift rig - buzzing
  183. GK 800RB Mystery
  184. Princeton Reverb tremolo broken, everything else works great
  185. SWR Bass 350 Capacitor rating?
  186. Pro Reverb questions:
  187. Super Reverb vibrato thumping, channel interaction
  188. amp cuts in and out
  189. the ol' hot rod deville...more drive not functioning
  190. Vintage Ampeg blowing fuses, indicator lights on dim when amp is off...
  191. Peavey Stereo Chorus 212
  192. Gibson Atlas 3gang pot wiring
  193. Harke HA4000 no sound just a very low distorted sound, What could it be the problem?
  194. Fuse blows for no reason?
  195. Silvertone 1449 help.
  196. Kustom k-200B - 4 No Output
  197. Is this Output Transformer Shot...?
  198. 7591 glowing screen on Panaramic (Magnatone/Audio Guild)
  199. 1973 super NO reverb
  200. Power transformer gets very hot after one minute idle
  201. I Learned Something Today
  202. Ampeg R212R Reverberocket
  203. Rectifier tube/Power tubes causing fuse to blow?
  204. Mesa Boogie Studio Caliber DC-2 Recording out noisy, any ideas on how to improve it?
  205. possible water damadge to a new traynor ycv40wr
  206. Fender Twin preamp fuzzing/crossover distortion
  207. JCM 800- neg voltage too negative
  208. KMD XV100SD Head Produces "Static Crescendo"/Popping
  209. Marshall amp has halfed its ouput volume
  210. Marshall 6100 LM blows fuses after tube swap! Help!
  211. Eden wt 400 issues
  212. SWR SM-900 Popping
  213. Roland JC120 - Weak/Distorted Chorus and Vib output
  214. Noob would like guidance setting bias for new EL34s in a Haze 40w Combo
  215. Marshall JCM2000 bias
  216. HELP NEEDED! Hot Rod Deluxe Volume drop.
  217. Anyone willing to help a n00b replace a PT in a working 1967 Super Reverb?
  218. Draining Filter Caps - Best place to meter.
  219. Crate Power Block 150 high frequency oscillation
  220. What Happened To My Amp??????
  221. struggling to hear my self onstage , having to rely on onstage monitoring
  222. AT100 Resistor mystery?
  223. Marshall valvestate 8008
  224. Acoustic 906 Mixer/PA problem
  225. Help solving Fender Hot Rod DeVille 410 reverb problem
  226. Need help replacing a broken transformer
  227. Princeton (NR) has kind of soft bottom end
  228. Peavey JSX flyback diode replacement
  229. weber princeton reverb clone a bit short on power
  230. Fender Hot Rod Deville Filament Winding Problem
  231. Pots for Ampeg VL series Guitar Amps?
  232. Lead Free desoldering help!
  233. Hartke 3500 Mosfet EQ Problem
  234. Valvestate VS100 parts
  235. Peavey ValveKing 100w head/ lead ch low volume
  236. Would I have a need for a 32-3 Regulated DC Power Supply as a casual amp hobbyist?
  237. Crate GFX 212 very low distorted output
  238. sound city 120 mk iv bias
  239. Peavey 5150 (mk2) bias
  240. Chorus and Reverb dead on Marshall AS50R......
  241. Fender Hot Rod Deville problem
  242. one marshall amp fixed . problem ? crap factory workmanship
  243. transistor troubleshooting
  244. Need Help With From Someone Wth JCM2000 DSL100
  245. '90s Fender Blues Deluxe wont make sound
  246. Crate Turbo Valve 120-Loss of sound
  247. channel 1 on my 1981 ampeg V3 is only barely audible
  248. '88 Princeton Chorus Ground Hum
  249. Output Transformer Failure?
  250. Hot Rod Deluxe Channel problem