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View Full Version : Maintenance, Troubleshooting & Repair



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  1. SWR WorkingPro 400 distorting
  2. Mesa Boogie Nomad 45 switching pops
  3. Marshall Valvestate AVT150 problem
  4. Traynor YBA-3: voltages all look good, but low output
  5. Stromberg Carlson AU 58B output transformer question
  6. Trem Noise
  7. Fender LTB PA Head Distorted Output
  8. Sozo Amplification Part II
  9. You may have to rebias.
  10. strange voltage readings for an AC15 clone
  11. Acoustic G100T circuit board pics
  12. Repairing switch mode power supplies
  13. What are the Fender (Eminence) Blueframe 10's rated at? 30watts, but what efficiency?
  14. Biasing a 1959HW
  15. 73 Twin Reverb
  16. problem with Fender Champ 600
  17. CSA Thermal Protector for a Fender 100w Twin Reverb with master volume
  18. Peavey Renown Making Buzzing Noise
  19. A Noob Moment
  20. Traynor YGM4 Tremolo Problem
  21. Princeton Reverb Help
  22. Marshall 6100 cap job - which brands of caps?
  23. Gibson Scout has no tremolo
  24. Sunn Solarus tremolo bulb...?
  25. Hi fi repairs
  26. Univox U-45Tremolo Issue
  27. Blues Jr bias running 25-30ma apart
  28. Hopeful to find help with a vintage Japanese tube amp
  29. Crate GT1200H- Help, strange problem
  30. Is this power transformer bad?
  31. Trace Elliot Boxer 30 Bass Amp - HUM!
  32. Replacing filter caps with a different value
  33. No Power--Peavey Valveking 212
  34. Can you help me describe the problem I'm having so I can research it?
  35. Off topic, but for the old timers
  36. Peavey XR600 Reverb Accutronics 4EB211B What's really Broken?
  37. Help with Marshall mg100
  38. Fender Hot Rod Deluxe
  39. Troubleshooting SS amp...30vdc on OUTPUT!
  40. Biasing '67 Super Reverb with Weber bias rite...calculator says 47, bias point max 36
  41. Carvin RX1200
  42. crate v100h problem
  43. Desoldering on a PCB
  44. Carvin PI problem
  45. GK 200MB speaker issue & solution
  46. Fender Princeton Chorus disassembly instruction
  47. 93 Fender Concert Amp cuts out after warming up.
  48. Fender Stage 112 se trouble
  49. what are these schematic symbols...?
  50. Deluxe 90 speaker?
  51. Ampeg B12XT Tremolo help
  52. Marshall JMC800 died after pods cleaned
  53. Bugera 6262-212
  54. Bias Trim Pot wiring ?
  55. Amp runs for 30 seconds, then fades out
  56. peavey 5150 recap job
  57. Marshall JCM 900 4100 acting up
  58. Ultimate Chorus
  59. Differential Diagnosis - JTM-45 Offset Panel Reissue
  60. AMPEG vh140c Guitar Head Power Issue
  61. MASCO MAP 15 - need help install 3 prong ac cord
  62. Explaining how to repurpose an amp to a tech
  63. Testing SS amp after Fixing
  64. Randall RG200 transformer.
  65. CRATE GT-80 (Yes another transformer down)
  66. Increasing Trem Intensity
  67. Selmer TnB 100 runs quiet
  68. Ampeg Schematics
  69. Ampeg svt 350h
  70. JMF Spectra Schematic
  71. Crossover for RCA transistor
  72. Assorted Schematics
  73. Polytone Schematics
  74. Bassman head problem
  75. Acoustic Control Corporation Schematics
  76. Fender SPL 9000 noise
  77. Mesa Titan V-12 / Help with hybrid amps
  78. Newbie seeking transistor Advice
  79. SVT CL Trips At High Power
  80. Marshall Jubilee head crackling
  81. Bugera amp parts
  82. Peavey SC400 PA brain (No Output question)
  83. Ampeg SVT Classic
  84. Need help trouble shooting peavey Mark III amp
  85. Super Reverb tremolo issues
  86. PEAVEY XR 400 Mixer AMP (200H schematic) Transistor ID Help
  87. SWR LA-15 Power transformer
  88. any marshall service guys? this one is kind of strange vs102
  89. Hot Rod Deluxe Wiring Question
  90. popping noise from Marshall Jubilee
  91. Mackie swa1501 - repair help resistor r14 & r22 values
  92. Peavey Heritage VTX blows cathode drive transistors
  93. Fender Twin bias weirdness, advice sought...
  94. Krank Krankenstein volume drop issue
  95. Fender Twin Reverb Started smoking & popping... outlet overload?!
  96. Ashdown FA60 blowing mains fuse
  97. I let the magic smoke out of my fender champion 600
  98. Schematic for Crate GLX65
  99. Blues Deluxe Tube problem.
  100. Vibrolux Reverb Ticking Tremolo
  101. Peavey Classic 30 grief
  102. Blues DeVille Bias
  103. Marshal MG 100HDFX
  104. Peavey 260c Assistance/Insight needed.
  105. Marshall 100 watt 1x12 model 2150....no heaters?
  106. 1995 Blues deluxe channel switching problem
  107. Testing varistor
  108. Help reparing arc'd socket PCB on Fender Deville
  109. Need help changing an auto bias circuit to adjustable Crate BV50
  110. Fender "The Twin" - burnt resisitor
  111. Hughes and Kettner Warp X - Help
  112. Speakers in 65 original Super Reverb?
  113. 1971 traynor ygm3 risen from the dead, dying again
  114. Fender Hot Rod Delux
  115. Crate palomino v16
  116. Unusual problem...
  117. Bugera 333xl 2x12 combo - breakthrough hiss on crunch n lead channels
  118. So I'm poking around with my chop stick...
  119. Quieting an old beast
  120. Did my amp really fix itself?
  121. Simple rig to match mosfets?
  122. Sozo Amplification / Slow ?
  123. Signal leaking with all controls at 0, other questions about Traynor YBA-3
  124. SVT-VT volume and noise problem, help!
  125. Vox VT 50
  126. Crate BV50-H loud hum on clean channel
  127. Crate GT1200H circuit draw at speaker jack
  128. Vibroverb 63 Reissue Bias Pot Mod
  129. Deluxe Reverb RI Bias questions as not same as my BF Super Reverb and Problems
  130. Wish Enzo Well
  131. where to buy fender pots?
  132. Strange overtones on certain low notes.
  133. A line out after PI in a princeton reverb
  134. Hartke HA3500 C401 Venting- Help Please
  135. MusicMan 4x12GS EVM 12L speaker trouble
  136. Yamaha Amp troubleshoot
  137. Cheap a$$ tube checker?
  138. Tone stack ?
  139. Ampeg SVT-VR turning on and off
  140. qsc rmx 2450
  141. Marshall AVT50 eating fuses
  142. SS "Whirlitzer" clone too fast!
  143. Reviving 1978 Lab series L3
  144. Mackie swa1501 copper trace damaged
  145. Kustom K50 Trem/Vibe not working
  146. Marshall Valvestate 8100 Effects Loop question
  147. Peavey Deuce eating fuses
  148. 5f1 problems
  149. HELP! Marshall G50CD booster sounds horrible.
  150. 135W Fender Twin is slowly burning up phase inverter tubes after a recap.
  151. Orignal '65 Fender Blackface Deluxe - Low bass .. .muddy.
  152. VH-140C little or no signal without jumper in effects loop
  153. Marshall DSL-50 fried lineup of B+ resistors in preamp ?
  154. Beloved Little Marshall MG15CDR Severely Ill, Please Please Help!
  155. small amp speakers
  156. Hughes & Kettner ATTAX 100 effects fail
  157. Crate BV50-H repairs?
  158. Ampeg BA115 input jack issues
  159. Mystery problems SVT 4 Pro continues
  160. Peavey TKO80
  161. 73 Silver face Twin Reverb hum balance pot observation ?
  162. Fender Bassman 200 Q10 & Q11 Quite Hot!
  163. Fender Red Knob Dual Showman is Killing Me
  164. Vintage OR80 with standby switch on OT CT... change it?
  165. Diving in... do you like you mikev med or rare?
  166. My Marshall G100cd Distortion channel doesn't distort like it use to
  167. Peavey TB Raxx - Transformer Secondary winding
  168. Fender Hot Rod Deluxe Drive/More Drive switching problem
  169. traynor ygm3 high plate voltage
  170. Mesa Triple Rectifier... trouble shooting
  171. cooked '66 deluxe reverb power transformer....wondering why??
  172. Peavey Valveking feedback troubles
  173. SWR Blonde On Blonde help please!
  174. Need help T-shooting a fender SS
  175. Need help with Marshal 2203l PI pin voltage specs
  176. Help with OLD to NEW Varistor Rating
  177. Advice on Hartke 3500 bass amp repair--power amp module
  178. Hot swapping tubes ?
  179. 2 channels blending when they shouldn't be?
  180. 1983 Fender Concert 1x12 buzzing
  181. Randall Rg100 head gain problem
  182. amp smoking...
  183. Princeton Chorus - No reverb
  184. Spike in B+
  185. Behringer dual 31 band eq issue
  186. DC heater question (Randall RG50)
  187. No sound from Fender Blues Deluxe Reissue
  188. Spidervalve 212 blows 500ma HT fuse
  189. Preamp filter stage question
  190. Line6 flextone II HD output section
  191. building the cab to pair with tiny terror
  192. AMPEG SVT-CL rewiring for 220V and other issues
  193. Onboard Tube Amp Bias Setup
  194. Digital effects board
  195. Peavey Classic 50 repair
  196. SWR SM-900 - no signal at preamp. Anyone got a schematic?
  197. 1997 Fender Vibrolux rattle sound!
  198. orange thunderverb
  199. Peavey Encore 65 blows fuse
  200. Peavey 5150 combo OT specifications
  201. SVT 7 pro no speaker output
  202. Should I buy this amp?
  203. Peavey Mace 320T
  204. Solder prices...
  205. Peavey Studio Pro 112 Transtube Red Stripe Hum
  206. Marshall 2098 Solid State Lead 100 Repair
  207. 1978 fender twin reverb problems...please help
  208. Ampeg SVT4 pro blown power channel
  209. Fender Stage 185 not making any sound
  210. Fender bandmaster
  211. troubleshooting low volume on a tube amp...
  212. Fender Princeton Reverb Silverface crackling
  213. Polytone Mini Brute II Problem
  214. Peavey Classic 30 - Speaker Short
  215. Fender 5f1 volume loss, overly compressed
  216. Hartke bass cab,input problem
  217. New Build... When the tone control is dimed I get crackle and volume diminishes.
  218. Tech soldering question ..
  219. danelectro honeytone amp.
  220. Bugera 333xl 212 Static and Popping
  221. Feedback in reverb Bandamaster Reverb AA1069
  222. Crate GX-212 Need Reverb Tank Part Number
  223. Peavey XR560 PA head
  224. 66 Fender Bassman hum
  225. Rose Morris AC30 Hum
  226. Fender roc pro 1000 help
  227. ho HUM... hum is driving me nuts
  228. mystery output transformer impedance
  229. SVT 4 Pro hum
  230. amp and speaker ohm help
  231. Blues Junior Buzz
  232. Recapping Filter Cap Clamps
  233. 450+ plate volts from 360v source @ the rectifier???? 6v6 amp
  234. Epiphone Valve Standard - Dropped --> VERY loud Whine/Hum
  235. Speaker switching suggestions for Vox
  236. high pitched squeal from my peavey XXL combo?
  237. 3 amps, same fault in one week: arced-over power tube sockets
  238. Problem with Valvestate 8280
  239. Help with switch wiring Vox V125
  240. Carvin x 60 b problems
  241. Trying to fix a broken Carlsbro Cobra 90 Series "Sherwood" amp
  242. VOX VC4 Foot Controller for Valvetronix (broken bus jack)
  243. Peavey Mark III Bass Head
  244. MArshall AVT 150H inadvertent loss of gain and high pitch squeals.
  245. 92PU06 Crossover?
  246. Magna Electronics Co. Melodier Model M-194-4-J bad OT?
  247. I thought speaker mounting holes were standardized?
  248. Peavey Valveking blows fuses
  249. grounding a 6.3V CT to reduce hum
  250. Best High Quality E- Caps