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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Bose System L1 Compact Power Stand
  2. Fender Hotrod deluxe noise like popcorn
  3. Got a Crown CE2000 Semi Fixed, Beginner looking for advice
  4. Mojotone CTS pots?
  5. Re-coating burned through PCB trace coating?
  6. Fender Super Reverb RI heating up
  7. NO CHANNEL 2 on MUCH BELOVED FENDER SUPER CHAMP XD.
  8. Laney VC30 112 bias problem (?)
  9. Reverb Tank reqd foruse as test equipment
  10. Plush P1000s on the bench
  11. Svt3 Pro Mosfets
  12. Gallien-Krueger 700RB
  13. Film capacitor
  14. New reverb tank needed?
  15. Replacement knobs for Champion 110 Amplifier
  16. What does this mod do? VH100R
  17. Cant find a OT for DSL401
  18. Gibson Apollo (GA-95RVT) AKA: Nightmare.
  19. Phase inverter, Mesa Boogie SOB
  20. Marshall JCM600 Head Drive channel low volume
  21. Vibrato channel no sound .
  22. How do I easily remove silicone sealant?
  23. Farfisa compact organ.
  24. Semi noisy carvin cx1272
  25. George L's Speaker cables ?
  26. Looking for ED combo amp schematic
  27. Brand new preamp tubes seem to be bad ?
  28. Bench supply recommendations
  29. How do I make this 'widowmaker' safe?
  30. Cathode bypass caps in Bassman 135
  31. '65 SR tranny ticking
  32. How do I rust new screws?
  33. Scratchy, Popping, Distortion in new Pro-Reverb build.
  34. Peavey rockmaster pre amp problems
  35. Hot Rod Deville III V1 random noise and oscillation.
  36. Need good amp tech in DFW area
  37. US Masters TVA30 schematic anyone?
  38. Marshall 6100
  39. HiWatt G15 8 MaxWatt - Gone Silent, chip details needed
  40. Cornford hurricane Blown Mains TX 2nd time
  41. Sessionette Power Amp Replacement
  42. Kustom K250-2
  43. Another MARSHALL Valvestate 2000 AVT150 Blowing fuses......
  44. Peavey Special 2x12 power supply is bad is this an easy fix
  45. Is this scope worth a nickel?
  46. Mesa 50 cal fried resistors continued
  47. Marshall VS 8080 IC1 Blowing.
  48. Quality workmanship.....
  49. What was the hardest problem you ever found and fixed?
  50. Deluxe Reverb schematic discrepancies?
  51. Fender Chamion DSP 30 Channel 2 has no volume control
  52. Best Way To Clean Off Green Powder Dust Off Old Chassis?
  53. 969 Ampeg SVT being snappy
  54. Vintage PA Tube Head Output Question
  55. Marshall 2100 JCM 900 Head Hum
  56. Question about 50s Fender OT ID
  57. JCM 800 2204 Self oscillation problem
  58. Bleed Resistor to Discharge High Voltage Caps in Tube Amp
  59. Crate v18 212 amp wont turn on anymore???
  60. Marshall 8008 Rack mount Blowing transistors
  61. Hughes and Kettner Switch Blade 100 guitar head
  62. 4.6V heater voltage on Fender Pro Tube Twin
  63. blues deluxe 1993 not the reissue
  64. Laney L30B Hums, Blows Fuses
  65. Buzzing first minute or so, Laney VH100R
  66. Sunn Beta Lead - Random but relatively constant crackle on output
  67. Marshall 2100 JCM 900 head oscillating
  68. No volume with Peavey XXL with effects loop in use.
  69. HELP With VOX AC100CPH
  70. Hughes and Kettner Switch Blade 100 guitar head
  71. Fender Hot Rod Deluxe 3
  72. Hum/Buzz When Power Transformer is Grounded to Chassis
  73. 100uf + 100uf caps bigger than 35mm
  74. Anyone Up For A Vintage Tube Swap?
  75. Fuse differences
  76. Fender Hot Rod Deluxe - weird noise on Drive channel
  77. Roland - JC77 potentiometer replacement
  78. SF Twin Reverb with buzzy reverb
  79. Crate VC6210 popped NTC before fuse, need advice..
  80. TSL-60 with vexing farting problem on all channels
  81. Mesa .50 Caliber + Fried resistors
  82. Cornford Hurriance blown tx again
  83. Fender Deluxe 5C3 question
  84. Need help finding pots for Hartke repair
  85. samson s6 distorted output
  86. I Thought It Was a Ground Loop
  87. Ampeg B-200R Dc on output
  88. bad tube with bizarre symptom
  89. PEAVEY XXL head won't switch channels
  90. Peavey 212 clean channel won't work
  91. Plush P1000s on the bench
  92. Strong oscillation in Reverberocket Echo circuit
  93. Fender 6G6-B Bassman hum
  94. Fender Performer 1000 popping on turn-off
  95. Replacement potentiometer for Fender Red Knob Twin
  96. Just shooting the breeze Carvin 400FET
  97. Carlsbro Powerine 800 voltages
  98. Crate Blue Voodoo
  99. SF Twin Reverb Vibrato Hum on Speed Pot??
  100. PV XR600 400R links?
  101. Traynor YCV40 Blown DC Filament Circuit
  102. Circuit diagram for Roland KC-500?
  103. Crate GXT-100W circuit diagram?
  104. Fender Hot Rod Deluxe Issue
  105. SWR LA-15 Stumped
  106. Fender Rumble 100 Bass Amp Problems- Help, Please.
  107. 1974 Garnet stencil 10-PT - AC isolation mod
  108. Cornford hurricane schematic
  109. Ampeg Gemini II 7591 bias questions
  110. Ampeg Gemini II Tone stack question
  111. HK switchblade 50W combo repair
  112. What is wrong with NTE transistors?
  113. Ampeg SVT-300 bias
  114. Amp Static Crackling noises SOUND CLIP ATTACHED
  115. Tweed Bassman clone with harsh breakup
  116. Marshall tsl 100 head loud Clean Channel Hum after it heats up after few minutes on
  117. No volume with Crate GLX1200H
  118. musicman mystery tap
  119. channel switching help (problem with amp)
  120. preamp valve weirdness
  121. Mesa F100 blowing single tube, in same socket, every time
  122. Twin reverb boost oscillation
  123. hartke ha7000
  124. Bugera 333xl-212 cap problem
  125. Could this cause my issue?
  126. Marshall Connector Identification
  127. 6V6 amp cutting out when guitars strings are picked hard
  128. Hafler G300 clipping on negative portion of waveform
  129. 80's Yamaha G-100
  130. SVT3Pro power amp failure
  131. Blackstar series one 50 help
  132. bias issue
  133. Blues Jr oscillation-
  134. Rattling on Fender Red Knob Twin! What could be the cause?
  135. Single Ended Odd Distortion - To NFB or not to NFB?
  136. Fender Champion 30
  137. Ampeg B15 woes.... no sound from guitar
  138. Fender Roc 1000 changing channels when played.
  139. Marshall JCM 2000 trans wires
  140. Marshall DSL short ???
  141. Need 3 Prong Power Conversion - But Heater On Primary Side of Iso Trans
  142. Krankenstein Jr PT replacement?
  143. Marshall VS100 clean problem
  144. Need Bias Help VC50H by SLM Crate
  145. GK 400rb III, heatsink isolated screw
  146. B-15N Power transformer replacement
  147. Current problem with a 6534+
  148. Looking for info on Ampeg B4
  149. Dealing with High B+
  150. Marhsall 100watt 1959 SLP Oscillation?
  151. SVT CL repair - process and safety
  152. Prosonic drive channel week and nasty problem
  153. Fender Super Champ XD no sound
  154. Marshall DSL HELP !
  155. What is your favorite flush cutter?
  156. Mesa Blue Angel burned board
  157. ** The Marshall TSL122 JCM2000 Repair/Mods Page **
  158. Help With Squeal/Crosstalk...
  159. HUM Marshall JMP 50w
  160. hooking up a 3 wire power cabl
  161. Soldano Cuts out
  162. Peavey Valveking died
  163. 73 Fender Silverface Twin Reverb Noise New Findings & Questions
  164. Fender 1961 Concert Brown face 6g12a re-cap time, need input
  165. Twin Reverb PT Surface Temperature
  166. Weird residual voltage problem...
  167. 5e3 build buzzing/overtone noise
  168. Ashdown EVO 500 III Hum
  169. fender prosonic output transformer
  170. AC30 Normal channel ground loop fix
  171. Channel bleed JCM 800 2205
  172. Fender reverb driver transformer - green wire grounded?
  173. 60's VOX Berkely II - where is the reverb tank?
  174. 333xl infinium problem
  175. Transformer specs
  176. Could someone open their Boogie Mark III for me?
  177. Line 6 Spider II - noise and channel switching issue
  178. Peavey Penta Series 140 Watt Head - Need Schematic
  179. peavey 300ch
  180. 5150 II to orgininal 5150 spec mistake
  181. hum problem in new homebrew build
  182. Marshal TSL 60 channel switching from CRUNCH/OD1 to LEAD/OD2 problem
  183. problem with roland cube 20x
  184. How much hum is acceptable in a Fender Red Knob Twin
  185. behringer Xentyx 1222 fx psu help
  186. Kustom Lead iii sc ombo - reverb issue - need schematic
  187. MB Subway Rocket Overall Volume Seems Low for 20w
  188. Engl Powerball interesting problem.
  189. What is cr-3 in FENDER DEVILLE
  190. Random Noise generated in power output stage of Fender Super 112...new guy here
  191. High pitched whistle continues on Fender Red Knob Twin, I am getting desperate
  192. What Brand or Type of valve would you use for a Bass
  193. Acoustic schematic
  194. Kustom 150 run hot?
  195. 73 Fender Silverface Twin Reverb Schematic / Layout question ?
  196. Behringer Truth B2030A ICs
  197. Peavey Mace VT red plating and arching...ouch!
  198. Marshall 75 Nasty Problem
  199. who has the best prices on ends?
  200. Genz-Benz El Diablo 100
  201. Peavey VTM 60 Question
  202. Peavey Mace VT Power Tubes?
  203. Marshal TSL 60 channel switching from OD1 to OD2 problem
  204. yet another VS265 with troubles
  205. 5150 - No Sound. HELP!!!
  206. Frontman 212r (yes another one)
  207. Help needed for new ideas to solve Ampeg BA115 intermittent crackle issue
  208. Ampeg SVT CL
  209. 6G2 Princeton - Weird Oscillation Only When Trem is Off?
  210. Silverface Reverb Bias Issue
  211. Gallien Kreuger 1001RB mk II turn on thump
  212. Very loud intermittent amp problem.
  213. NFB wire diameter/gauge
  214. When OT Diagnostics Don't Help
  215. Is this risky?
  216. VOX AC30 - Bad distortion
  217. Reverb pop when the amp is on, and long starting vibrato
  218. Peavey Delta Blues issue...won't work
  219. MarshallJCM800 2210 hum
  220. mesa boogie f-100, loss of reverb
  221. Bad Reverb Transformer?
  222. Magnatone 213 bias question
  223. Laney LC50 MK2 Low Normal channel
  224. Boss CE-3 LED enigma
  225. 73 Fender Silverface Twin Reverb Voltages ,and Noise
  226. Bypassing Peavey Tubefex DSP / turning it analogue
  227. Peavey Mace channel switching problem ?
  228. Behringer MDX 212
  229. sunn beta lead, choked, low, farty output
  230. Mackie Snap crackle and pop
  231. 6U10 hummm
  232. Roland JC-120 circuit help
  233. Laney LC50 MK2 Schematic reqd
  234. Fender 80s "II" series amps vactrol ratings?
  235. SWR 350 Bass Howling
  236. Line 6 spider 212
  237. HH Bass Machine
  238. Mesa Boogie Road King - strange distortion in outpout stage
  239. Speaker-related dumb question: speaker SIZE
  240. Speaker Protection help
  241. Univox Bias questions HIGH VOLTAGE!!!
  242. Midi Problem: Loose all programs when turning off amp
  243. AC filaments too hot!
  244. Princeton Problem
  245. Marshall DSL 50 still passing signal with the volumes on 0?
  246. Trace Elliot AH300 GP12 series6
  247. Vox AGA-70 DI mod request schems needed.
  248. Mesa Boogie Lone Star Special
  249. Trace Elliot AH300 outputs
  250. Marshall TSL100 Problems