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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Distortion and crackle sound with laney bass amp
  2. Peavey Classic 50 Equalizing Issues
  3. Valvking 212 Blowing Fuses in Power Stage
  4. Vox AD15VT distortion and low output on manual setting
  5. Bias/balance question for Blackface Super Reverb
  6. Peavey Classic 50 Sparking Tube Pin
  7. Thomas Vox replacement transistors
  8. Pignose G40V?
  9. Peavey Classic A series-Low Volume
  10. Burning resistor on my Road 220
  11. Ampeg B15n--whats the output bias supposed to be?
  12. Built a P-P 6k6 based guitar amp. jcm800 and 5e3 inspired. Need to work out one issue
  13. Peavey JSX212 Repair - Crackling & Hum
  14. Quick MARSHALL AVT150 Power Module Question
  15. 1 month old Bugera 333XL12 amp made popping sound and died.
  16. SF Super Rreverb Oscillation?
  17. Crate Vintage Club 50 Issues
  18. SVT 4 pro Issue
  19. 5e3 build start up issue
  20. My supro is silent... dead silent
  21. Repairman in Los Angeles?
  22. Dead OT?
  23. Hot Rod Deville Bias Question
  24. Marshall MG100dfx Weirdness
  25. Yamaha G100 - fried voltage regulator?
  26. Krankenstien plus amp thats drawing alot of current
  27. In need of firmware for Line 6 Spider II 30 amp
  28. Champ Silverface Question
  29. JTM45 Pot Values
  30. Hot xformer
  31. Headphone jack for a Marshall VS265
  32. harmony 415c trem help
  33. Peavey TNT 115 Scorpion constant Humming all the time
  34. Molex connector arcs
  35. Buzzing power transformer fix
  36. Marshall Valvestate 8080 dead effect loop
  37. Peavey 5150 effect loop bleed
  38. Classic 50 OT replacement
  39. AVT150 dead at gig but works when I got home
  40. marshall voltage selector
  41. peavey tnt 150 has a buzzing/ humming
  42. Carlsbro glx 150 head
  43. Marshall DSL 100 Redplating and POP goes the fuse!
  44. Crate Stelth GT50 modification
  45. Newbie - How much damage did I do?
  46. Fender 57 Twin HW Reissue
  47. Ac30cc2 problems
  48. fender stage 100 combo no volume
  49. Peavey F-800G Super Festival Series Amp goes from bad to worse...
  50. Fender Rhodes
  51. Question about power consumption (Mesa Cal+ 50 head)
  52. Transformer hum?
  53. JCM 2000 problem
  54. Mesa MkIII issue
  55. Possible reasons for electric shock
  56. Reverb Wet/Dry Mix Problem
  57. failing cap residual AC question and another buzz/humm thread
  58. Peavey TKO 115 repair help
  59. How low is too low (heaters)?
  60. Twin Reverb.... PT bad ?
  61. MosValve mosfets?
  62. Blues Junior power transformer smoking - can it be rewound ?
  63. Laney bass amp blows output transistors!
  64. Trace Elliot Bass amp repair
  65. Need help diagnosing a 70's vintage PA
  66. B52 Stealth 60W head reverb tank
  67. Ampeg SVT-4 Pro
  68. Weird voltage reading Selmer
  69. WT 400 enhance circuit and di problem
  70. Sunn 300 Coliseum Troubles
  71. general tips for isolating noisy component
  72. What's the buzz on hum in old tube amps?
  73. Fried BF Bassman Heater CT!
  74. SUNN Model T 2nd Gen Power up ?
  75. PEAVEY Special 130 noise problem
  76. Randall RG50TC low low low output....
  77. Repairing Acoustic G60T Amp Head
  78. GK Backline 210 makes crackling noise when playing in low register
  79. Yamaha T50C - need advice
  80. Sunn 200s multicap can, etc. replaced but showstoping problem persists
  81. Strange problem with Peavey Classic 30
  82. Lead Free Solder
  83. Seymour Duncan convertable 60 watt low volume probs ... HELP !
  84. have a better one
  85. 66 Super Reverb no so super sounding
  86. Peavey Valveking volume drop in lead channel
  87. Carlsbro 50Top bias problem
  88. Fender Acoustasonic 30 problem - Noise on Reverb only... HELP?!
  89. Mesa noise?
  90. dying '77 peavey classic 50 212
  91. Unstable Bias, blowing fuse
  92. Peavey Bandit 65 - Sounds awful - looking for some help!
  93. Marshall Valvestate 265 with one channel hum
  94. Nuts for Jacks & Pots
  95. Fender Bassman SP3100 acting weird (again :P ) Cap problems?
  96. bias question
  97. Cerwin Vega BG-250 amplifier, starving output
  98. Y2 Class EMI Suppression Capacitor - "Death Cap"
  99. Crate BV 60 Blue Voo Doo - Master Volume pot replacement.....
  100. Tiny terror trouble
  101. Fender Hot Rod Deluxe- Cutting out and dirty
  102. super reverb earth issue
  103. Marshall AVT 20 Hum
  104. Sano oscillation
  105. Peavey Vypyr 75 question
  106. Peavey 5150 head won't power on!
  107. MusicMan 2475-75 Problem
  108. Blues Junior question
  109. Peavey Encore 65 - need help troubleshooting
  110. Bad Cat Hot Cat ?
  111. Peavey Classic 50 - 212
  112. Marshall 8100 output transistor
  113. Kustom 200 Blowing Fuses
  114. 63 vibroverb reissue--reverb problem
  115. Silicone and others
  116. resurrecting Avometer 8
  117. Fender switching pots?
  118. POG bad DSP?
  119. help with dropping voltages in secondaries
  120. Is my Gibson Atlas blowing up my tubes or am I just unlucky?
  121. Sunn 1200S
  122. 6V6GTA plate dissipation in cathode bias push pull amp
  123. Huge difference in bias readings from tube to tube on matched sets
  124. Mesa/Boogie S.O.B. tube question/idea
  125. Mesa Nomad 45 - Strange Power Transformer Conundrum
  126. Trace Elliot Super Tramp TSC Blowing Fuse's
  127. B-52 AT-100 making vibration sound when palm muting or low notes
  128. 50 watt jmp 76
  129. Marshall MG50DFX sound problem
  130. Roland Cube 60 - Fuzzy Buzz
  131. princeton stereo chorus has bad hum...stumped!
  132. bad preamp tube creating open ground?
  133. Noisy bugera
  134. help with Laney pro tube
  135. marshall valvestate 8100 pot value help!!!!
  136. What would cause high frequency oscillation with neg feedback loop connected?
  137. Broken allen & heath board amp need help finding ec-10n20 mosfet
  138. G-K Backline 250 Head Blowing Fuses, Help Please!
  139. Fender Champ squeals
  140. Fender Pro Reverb Vibrato ticking
  141. Roland JC-120 channel 2 no work!
  142. Problem with Musicman RP-65 (2165-RP) volume.
  143. Peavey Transtube Envoy 110
  144. Ampeg M12
  145. Transformer Current Rating Help
  146. cube 60 broken lead channel
  147. Bassman export amp silverface 1970 circuit
  148. 50 watt jmp
  149. AVT150 (again, sorry)
  150. 69 Fender Princeton Reverb - Vibrato and Tone Stack Issues
  151. Peavey Classic 30 Help
  152. Laney AOR/50 100 - anyone have one ?
  153. bass amp buzzing/distorted
  154. vintage 1960 fender champ volume issue
  155. turned on amp with no PI tube...
  156. Cooked Acoustic 370
  157. Crate Palamino v32 112 Issue
  158. Torres DM200 motorboats on loud notes
  159. PeaveyTMax squeal
  160. Ampeg B15 high plate voltage?
  161. Plate voltage on Valvestate 8080 head
  162. SWR WM 4004 headphone jack resistors
  163. Fender Performer 1000
  164. Hums, ground loops, and strange squeals.
  165. Amp too "honky" !!!
  166. 65 Blackface Bassman
  167. JCM602 heater question...
  168. Ampeg ET-2 Super Echo Twin bias issues...
  169. speaker resistance for Fender Stage 160.
  170. 5F6-A ugly distortion - Direct coupling question
  171. Peavey Butcher won't come off standby
  172. Laney GH50L problems plus I saw my first power tube go down in electrical fury
  173. Ampeg r-12-r-b motorboating
  174. sano low volume
  175. Hartke 3500 EQ Board
  176. Kustom 36' Coupe bias
  177. 60's Gibson Hawk
  178. Blues Deville reissue tone control acts like bass control in reverse
  179. One day mg100hdfx the next nothing...help!?!
  180. Replacement output transformer for Peavey Valveking
  181. SWR 550X- Constant hum issue
  182. Ramdom poping sound
  183. AB763/6G16 Circuitry
  184. Polytone minibrute iv noise
  185. Marshall JMP-1 Tube Preamp Burning Resistors
  186. Peavey Ultra Plus 120W Tube Amp No sound output
  187. EL84 Bias Values, crackling, etc....
  188. 20 amp fuses?
  189. Quieting a noisy fan?
  190. Fender 212r again
  191. Mesa Boogie Heartbreaker popping issue
  192. 7591 Bias
  193. S30-A Bremia Tube amp.
  194. Tech help needed. Different readings between direct plate, cathode & bias probes.
  195. Obscure Guild Maverick Amp (7591's) VERY low volume/not working.
  196. '69 bassman troubles
  197. No plate current, but why?
  198. [rebuild] SUNN A212 Combo
  199. Carvin X100B Reissue Issue
  200. fender rhodes power transistors
  201. does this sound like a bad solder?
  202. Help needed with Frontman 15G input jack replacement
  203. Mackie SRM450 tweeter replacement?
  204. biasing 1966 BFSR
  205. Solved a reverb feedback problem read on to be enlightened.
  206. sound city 50r mk 3 reverb tank
  207. Line6 AX2 Modeling Amp Emits Solid Tone When Switched On
  208. Reducing noise in Carlsbro valve PA head
  209. Fender DRRI OT replacement
  210. Two-Stroke Amp loses volume intermittently
  211. Amp Tech in Gdansk, Poland?
  212. JC 120 went Pfft!
  213. Bugera 6262 combo..here I go again
  214. Marshall Valstate 100r - No distortion
  215. Anybody have a legible TC-142 schematic?
  216. Weird amp hum
  217. Carvin Legacy 100 head arcing issue
  218. Fender Bassman SP3100 "moaning"
  219. Magnatone MP1 help
  220. Peavey Triumph 60 Effects Loop noise
  221. Preamp negative grid voltage, oscillation?
  222. Laney Klipp 60
  223. Kustom PA 300 DC on output and lots of it!!!
  224. Fender Musicmaster Bass amp fuse holder
  225. Vox AC30 reverb model with loud hum(strange AC30 problems revisited)
  226. Fender roc pro 1000
  227. Peavey CS-400
  228. Ampeg V4 distortion model
  229. V-amp problem
  230. SWR Workingman 300
  231. Marshall JCM2000-60W: Serious damage from whiskey spill!
  232. Is this cap cooked?
  233. Soundtronics Custom300 7027 screen resistors?
  234. Please help me troubleshoot my Roland JC-160!
  235. Wierd Blues Jr problem-helps
  236. 5150 combo keeps blowing fuses
  237. gibson g20 troubleshooting help
  238. Marshall JCM 2000 DSL
  239. VOX AD100 motorboating / machine gun sound out of nowhere...
  240. Pictures of wiring, ab763 reverb parts
  241. peavey triple x head problem with effects loop
  242. Power transformer--how hot is too hot?
  243. Makeshift rig - buzzing
  244. GK 800RB Mystery
  245. Princeton Reverb tremolo broken, everything else works great
  246. SWR Bass 350 Capacitor rating?
  247. Pro Reverb questions:
  248. Super Reverb vibrato thumping, channel interaction
  249. amp cuts in and out
  250. the ol' hot rod deville...more drive not functioning