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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Fender Tone-master Problem
  2. Peavey 5150 - Preamp and Poweramp seem fine, but NO SOUND
  3. Gibson... Saturn?
  4. Silverface Vibrolux tremolo ticking noise
  5. Broken Line 6 Spider III HD?
  6. Fender Blues Deville - No Reverb
  7. A special kind of hum - Snider amplifier
  8. Ampeg VT-40
  9. Changing rectifier modes in B52 AT100...
  10. Volume when there should be none, when volume pot is at zero on Gibson Titan
  11. QSC ISA500 quiescent current
  12. Acoustic 270 -- Weird voltages in power amp
  13. What rating fuse to use?
  14. Laney Pro Bass Head
  15. Cap Voltage rating for 1/2-wave voltage doubler - question
  16. fender acoustasonic 30dsp has low output power
  17. 5y3 rectifier, no B+
  18. Fender 65R Frontman 1x12 combo reverb problem question
  19. Gemini PL-90 Power Conditioner help
  20. 1972 Ampeg VT-22
  21. Ampeg SVT Classic direct out distorted
  22. Behringer PMH18M Schematic.....
  23. B-52 AT212 suddenly lost volume
  24. Fender FM 212R dead
  25. pignose g40v power transformer replacement
  26. A/C Power Cord Replacement - Gauge Recommendations
  27. Crate MX65R Amp Noise
  28. Is there a Rev. B Schematic for 2004 Blues Deluxe Reissue?
  29. Output transistors sockets SWR SM-400
  30. Marshall MG10CD won't stay fixed!!
  31. Oscilloscope and Signal Generator
  32. Mesa 50 Caliber + Hum
  33. PV Triumph low gain
  34. Carvin X100B resistor question.
  35. 1970 Fender Silverface Twin Reverb
  36. Fender Twin Amp Vol Control Noise in 25W Mode
  37. PV ValveKing 100 intermittent pre noise
  38. No Sound on just the NORMAL channel of a 1971 Super Reverb
  39. Farfisa 8 amp
  40. Madison Divinity Blowing Mains Fuse
  41. Need Help for my Fender Stage 112 SE
  42. SVT-CL Classic - loud noise coming out of standby
  43. Bassman won't stay fixed!
  44. Problem with 65 Deluxe Reverb Reissue - no sound.
  45. Fender Twin Reverb on generator released the magic smoke - help!
  46. Blues Deluxe Reissue PCB Conformal Coating Resistance?
  47. Help with 1965 Vox solid state amp, please!
  48. Hartke 3500 Mosfet
  49. VHT special 6 repair
  50. Higher Voltage measurement on Base Tube Amp
  51. Peavey Windsor head has Very Loud Hum
  52. How to put a Digitech RP-1 back together
  53. Ampeg B-100R Melting Bridge Recto
  54. I Messed up my Fender Stage 112SE
  55. Peavey 6505+ 112 Combo - Lead channel problem
  56. Voltages too high on my 1968 Fender Bandmaster
  57. Question about a Gibson Skylark Amp
  58. Help..Marshall mg15cdr ticking constantly
  59. Gibson GA-18 Temolo Issues
  60. Please help with this amp - is it really a 'widow-maker'? Isolation tranny advisable?
  61. Peavey Classic 20 Low, Distorted volume
  62. 80's Roland JC-120 2 questions
  63. Need repair help please!
  64. Hum problem with SWR Bass 350
  65. Noise problem with Engl Screamer
  66. Destinking an old tube amp, Smells like.... 43 yr old cigarette bandmaster
  67. Converting an overseas market Line6 amp to 120v
  68. Questions concerning OT measurements
  69. SVT1000 No power....
  70. Help with old Peavey CS400 power amp
  71. A Rant About DC Heater Supplies
  72. Reverb Hum
  73. Tremelo not working on a Fender bandmaster reverb
  74. Orange AD140 HTC low output
  75. Mesa Boogie 3 channel Triple Rectifier oscillation
  76. Humming Mosrite BG-500 amp
  77. Older Peavey Blues Classic 50 Watt 1 X 15 Volume Fadeouts (Capacitor?)
  78. Power Transformer Specs
  79. Roland KC-150 Won't Power On
  80. Cap age
  81. Peavey Valve King 212 combo - Help!!!
  82. Peavey Transformer 212 knob problem
  83. Peavey Classic 30 volume fades out.
  84. Carvin R600 intermittant protect trip
  85. JTM45 squealing with presence controll wide open.
  86. "Floating" IC in GK 800RB?
  87. Scope advice?
  88. Power Transformers With Internal Thermal Protection Fuse
  89. Capacitor ID
  90. Fender Bassman 59 reissue - mystery random static
  91. Sovtek Tube Midget 50
  92. Fender '94 Twin Amp Hum....
  93. Crate Blue VooDoo 6212 Problems
  94. Bugera 333xl-212 retubing
  95. MusicMan HD130 2100-130 Shuts off on "Hi-Power" Mode
  96. blues deluxe repair
  97. Tweed Deluxe ....lost it's mojo
  98. Marshall DSL 100 and the stupid cap that shorts
  99. Univox U-50 Power Transformer issues
  100. Trace Elliot AH250 smx gp12 - oscillation on the gate of 2sk135 mosfets
  101. Fender Rumble 25 LM3876 fuzz
  102. Determined to fix 93 Blues deluxe
  103. Silverface Deluxe Reverb....hum from VIB channel
  104. Fender Twin Reissue with a bad hiss
  105. Sunn 300T loses volume control
  106. Silvertone 1481 Resistors
  107. Power tubes glowing and loss of power
  108. Ampeg SVT-4 Pro Troubleshoot 7vdc offset on both A and B outputs.
  109. Bad OT in Crate VC5310
  110. Trace Elliot AH300 Bass Head Distored Output
  111. How to measure voltage on 93 blues deluxe
  112. Blues Jr. Cathode Bias Mod question
  113. Mesa Express 5:25 question.
  114. Marshall pots, where to buy??
  115. Ruby volume problem
  116. Sears silvertone 1481 - Shocking sound!
  117. Warwick potentiometer (Pro Tube IV)
  118. Bridge Rectifier
  119. Mesa Heartbreaker- Tech question, please
  120. Mesa Nomad 45 power supply problem
  121. Hartke HA3500 Messed up!!
  122. Marshall JCM2000, Tube Heater Not Coming On
  123. Kitty Hawk M3
  124. Blues Junior - screams from hell!
  125. Fender Prosonic Cutting in & Out after several minutes of warm up
  126. ELK EL-30
  127. Deluxe Reverb RI bias question
  128. Problem here. Laney
  129. Blues Deville speaker problems
  130. Selmer TnB 50 SV
  131. SWR WorkingPro 400 distorting
  132. Mesa Boogie Nomad 45 switching pops
  133. Marshall Valvestate AVT150 problem
  134. Traynor YBA-3: voltages all look good, but low output
  135. Stromberg Carlson AU 58B output transformer question
  136. Trem Noise
  137. Fender LTB PA Head Distorted Output
  138. Sozo Amplification Part II
  139. You may have to rebias.
  140. strange voltage readings for an AC15 clone
  141. Acoustic G100T circuit board pics
  142. Repairing switch mode power supplies
  143. What are the Fender (Eminence) Blueframe 10's rated at? 30watts, but what efficiency?
  144. Biasing a 1959HW
  145. 73 Twin Reverb
  146. problem with Fender Champ 600
  147. CSA Thermal Protector for a Fender 100w Twin Reverb with master volume
  148. Peavey Renown Making Buzzing Noise
  149. A Noob Moment
  150. Traynor YGM4 Tremolo Problem
  151. Princeton Reverb Help
  152. Marshall 6100 cap job - which brands of caps?
  153. Gibson Scout has no tremolo
  154. Sunn Solarus tremolo bulb...?
  155. Hi fi repairs
  156. Univox U-45Tremolo Issue
  157. Blues Jr bias running 25-30ma apart
  158. Hopeful to find help with a vintage Japanese tube amp
  159. Crate GT1200H- Help, strange problem
  160. Is this power transformer bad?
  161. Trace Elliot Boxer 30 Bass Amp - HUM!
  162. Replacing filter caps with a different value
  163. No Power--Peavey Valveking 212
  164. Can you help me describe the problem I'm having so I can research it?
  165. Off topic, but for the old timers
  166. Peavey XR600 Reverb Accutronics 4EB211B What's really Broken?
  167. Help with Marshall mg100
  168. Fender Hot Rod Deluxe
  169. Troubleshooting SS amp...30vdc on OUTPUT!
  170. Biasing '67 Super Reverb with Weber bias rite...calculator says 47, bias point max 36
  171. Carvin RX1200
  172. crate v100h problem
  173. Desoldering on a PCB
  174. Carvin PI problem
  175. GK 200MB speaker issue & solution
  176. Fender Princeton Chorus disassembly instruction
  177. 93 Fender Concert Amp cuts out after warming up.
  178. Fender Stage 112 se trouble
  179. what are these schematic symbols...?
  180. Deluxe 90 speaker?
  181. Ampeg B12XT Tremolo help
  182. Marshall JMC800 died after pods cleaned
  183. Bugera 6262-212
  184. Bias Trim Pot wiring ?
  185. Amp runs for 30 seconds, then fades out
  186. peavey 5150 recap job
  187. Marshall JCM 900 4100 acting up
  188. Ultimate Chorus
  189. Differential Diagnosis - JTM-45 Offset Panel Reissue
  190. AMPEG vh140c Guitar Head Power Issue
  191. MASCO MAP 15 - need help install 3 prong ac cord
  192. Explaining how to repurpose an amp to a tech
  193. Testing SS amp after Fixing
  194. Randall RG200 transformer.
  195. CRATE GT-80 (Yes another transformer down)
  196. Increasing Trem Intensity
  197. Selmer TnB 100 runs quiet
  198. Ampeg Schematics
  199. Ampeg svt 350h
  200. JMF Spectra Schematic
  201. Crossover for RCA transistor
  202. Assorted Schematics
  203. Polytone Schematics
  204. Bassman head problem
  205. Acoustic Control Corporation Schematics
  206. Fender SPL 9000 noise
  207. Mesa Titan V-12 / Help with hybrid amps
  208. Newbie seeking transistor Advice
  209. SVT CL Trips At High Power
  210. Marshall Jubilee head crackling
  211. Bugera amp parts
  212. Peavey SC400 PA brain (No Output question)
  213. Ampeg SVT Classic
  214. Need help trouble shooting peavey Mark III amp
  215. Super Reverb tremolo issues
  216. PEAVEY XR 400 Mixer AMP (200H schematic) Transistor ID Help
  217. SWR LA-15 Power transformer
  218. any marshall service guys? this one is kind of strange vs102
  219. Hot Rod Deluxe Wiring Question
  220. popping noise from Marshall Jubilee
  221. Mackie swa1501 - repair help resistor r14 & r22 values
  222. Peavey Heritage VTX blows cathode drive transistors
  223. Fender Twin bias weirdness, advice sought...
  224. Krank Krankenstein volume drop issue
  225. Fender Twin Reverb Started smoking & popping... outlet overload?!
  226. Ashdown FA60 blowing mains fuse
  227. I let the magic smoke out of my fender champion 600
  228. Schematic for Crate GLX65
  229. Blues Deluxe Tube problem.
  230. Vibrolux Reverb Ticking Tremolo
  231. Peavey Classic 30 grief
  232. Blues DeVille Bias
  233. Marshal MG 100HDFX
  234. Peavey 260c Assistance/Insight needed.
  235. Marshall 100 watt 1x12 model 2150....no heaters?
  236. 1995 Blues deluxe channel switching problem
  237. Testing varistor
  238. Help reparing arc'd socket PCB on Fender Deville
  239. Need help changing an auto bias circuit to adjustable Crate BV50
  240. Fender "The Twin" - burnt resisitor
  241. Hughes and Kettner Warp X - Help
  242. Speakers in 65 original Super Reverb?
  243. 1971 traynor ygm3 risen from the dead, dying again
  244. Fender Hot Rod Delux
  245. Crate palomino v16
  246. Unusual problem...
  247. Bugera 333xl 2x12 combo - breakthrough hiss on crunch n lead channels
  248. So I'm poking around with my chop stick...
  249. Quieting an old beast
  250. Did my amp really fix itself?