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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Output Transformer works but totally cool
  2. Staticy Woosh when turning off standby, background grit: Rivera Fandango 55
  3. 40 watt Sunn amp sounds great but lacks power
  4. Ashdown chassis removal
  5. Marshall 2020 transformer reliability
  6. BA-115HPT
  7. Recommendations for a good epoxy to repair a circuit board
  8. transitor substitution help
  9. Bias probes ?? UK supplier?
  10. Hartke HA-3500 farty noise
  11. 1959 Superlead sounding bad after can cap job
  12. Weber copper cap rectifier - Blown?
  13. Bogner Shiva - reverb issue
  14. Fender optoisolator tremolo ticking/clicking
  15. 1953 Gibson BR9-GA9 hybrid model Low output volume
  16. usa built blues deville 4x10 footswitch problem
  17. Volume fading in and out on a Peavey Vyper 75w combo amp
  18. jcm900 high gain dual reverb very low volume
  19. Fender Red Knob Twin (1987-1994) aka THE TWIN upgrades
  20. Another -15v supply problem!
  21. Fender the twin (1990's) 250k 16mm PDT pots
  22. scope help
  23. Behringer ACX1000 schem?
  24. Music Man 2165-RD Voltage Issue
  25. Bose System L1 Compact Power Stand
  26. Fender Hotrod deluxe noise like popcorn
  27. Got a Crown CE2000 Semi Fixed, Beginner looking for advice
  28. Mojotone CTS pots?
  29. Re-coating burned through PCB trace coating?
  30. Fender Super Reverb RI heating up
  31. NO CHANNEL 2 on MUCH BELOVED FENDER SUPER CHAMP XD.
  32. Laney VC30 112 bias problem (?)
  33. Reverb Tank reqd foruse as test equipment
  34. Plush P1000s on the bench
  35. Svt3 Pro Mosfets
  36. Gallien-Krueger 700RB
  37. Film capacitor
  38. New reverb tank needed?
  39. Replacement knobs for Champion 110 Amplifier
  40. What does this mod do? VH100R
  41. Cant find a OT for DSL401
  42. Gibson Apollo (GA-95RVT) AKA: Nightmare.
  43. Phase inverter, Mesa Boogie SOB
  44. Marshall JCM600 Head Drive channel low volume
  45. Vibrato channel no sound .
  46. How do I easily remove silicone sealant?
  47. Farfisa compact organ.
  48. Semi noisy carvin cx1272
  49. George L's Speaker cables ?
  50. Looking for ED combo amp schematic
  51. Brand new preamp tubes seem to be bad ?
  52. Bench supply recommendations
  53. How do I make this 'widowmaker' safe?
  54. Cathode bypass caps in Bassman 135
  55. '65 SR tranny ticking
  56. How do I rust new screws?
  57. Scratchy, Popping, Distortion in new Pro-Reverb build.
  58. Peavey rockmaster pre amp problems
  59. Hot Rod Deville III V1 random noise and oscillation.
  60. Need good amp tech in DFW area
  61. US Masters TVA30 schematic anyone?
  62. Marshall 6100
  63. HiWatt G15 8 MaxWatt - Gone Silent, chip details needed
  64. Cornford hurricane Blown Mains TX 2nd time
  65. Sessionette Power Amp Replacement
  66. Kustom K250-2
  67. Another MARSHALL Valvestate 2000 AVT150 Blowing fuses......
  68. Peavey Special 2x12 power supply is bad is this an easy fix
  69. Is this scope worth a nickel?
  70. Mesa 50 cal fried resistors continued
  71. Marshall VS 8080 IC1 Blowing.
  72. Quality workmanship.....
  73. What was the hardest problem you ever found and fixed?
  74. Deluxe Reverb schematic discrepancies?
  75. Fender Chamion DSP 30 Channel 2 has no volume control
  76. Best Way To Clean Off Green Powder Dust Off Old Chassis?
  77. 969 Ampeg SVT being snappy
  78. Vintage PA Tube Head Output Question
  79. Marshall 2100 JCM 900 Head Hum
  80. Question about 50s Fender OT ID
  81. JCM 800 2204 Self oscillation problem
  82. Bleed Resistor to Discharge High Voltage Caps in Tube Amp
  83. Crate v18 212 amp wont turn on anymore???
  84. Marshall 8008 Rack mount Blowing transistors
  85. Hughes and Kettner Switch Blade 100 guitar head
  86. 4.6V heater voltage on Fender Pro Tube Twin
  87. blues deluxe 1993 not the reissue
  88. Laney L30B Hums, Blows Fuses
  89. Buzzing first minute or so, Laney VH100R
  90. Sunn Beta Lead - Random but relatively constant crackle on output
  91. Marshall 2100 JCM 900 head oscillating
  92. No volume with Peavey XXL with effects loop in use.
  93. HELP With VOX AC100CPH
  94. Hughes and Kettner Switch Blade 100 guitar head
  95. Fender Hot Rod Deluxe 3
  96. Hum/Buzz When Power Transformer is Grounded to Chassis
  97. 100uf + 100uf caps bigger than 35mm
  98. Anyone Up For A Vintage Tube Swap?
  99. Fuse differences
  100. Fender Hot Rod Deluxe - weird noise on Drive channel
  101. Roland - JC77 potentiometer replacement
  102. SF Twin Reverb with buzzy reverb
  103. Crate VC6210 popped NTC before fuse, need advice..
  104. TSL-60 with vexing farting problem on all channels
  105. Mesa .50 Caliber + Fried resistors
  106. Cornford Hurriance blown tx again
  107. Fender Deluxe 5C3 question
  108. Need help finding pots for Hartke repair
  109. samson s6 distorted output
  110. I Thought It Was a Ground Loop
  111. Ampeg B-200R Dc on output
  112. bad tube with bizarre symptom
  113. PEAVEY XXL head won't switch channels
  114. Peavey 212 clean channel won't work
  115. Plush P1000s on the bench
  116. Strong oscillation in Reverberocket Echo circuit
  117. Fender 6G6-B Bassman hum
  118. Fender Performer 1000 popping on turn-off
  119. Replacement potentiometer for Fender Red Knob Twin
  120. Just shooting the breeze Carvin 400FET
  121. Carlsbro Powerine 800 voltages
  122. Crate Blue Voodoo
  123. SF Twin Reverb Vibrato Hum on Speed Pot??
  124. PV XR600 400R links?
  125. Traynor YCV40 Blown DC Filament Circuit
  126. Circuit diagram for Roland KC-500?
  127. Crate GXT-100W circuit diagram?
  128. Fender Hot Rod Deluxe Issue
  129. SWR LA-15 Stumped
  130. Fender Rumble 100 Bass Amp Problems- Help, Please.
  131. 1974 Garnet stencil 10-PT - AC isolation mod
  132. Cornford hurricane schematic
  133. Ampeg Gemini II 7591 bias questions
  134. Ampeg Gemini II Tone stack question
  135. HK switchblade 50W combo repair
  136. What is wrong with NTE transistors?
  137. Ampeg SVT-300 bias
  138. Amp Static Crackling noises SOUND CLIP ATTACHED
  139. Tweed Bassman clone with harsh breakup
  140. Marshall tsl 100 head loud Clean Channel Hum after it heats up after few minutes on
  141. No volume with Crate GLX1200H
  142. musicman mystery tap
  143. channel switching help (problem with amp)
  144. preamp valve weirdness
  145. Mesa F100 blowing single tube, in same socket, every time
  146. Twin reverb boost oscillation
  147. hartke ha7000
  148. Bugera 333xl-212 cap problem
  149. Could this cause my issue?
  150. Marshall Connector Identification
  151. 6V6 amp cutting out when guitars strings are picked hard
  152. Hafler G300 clipping on negative portion of waveform
  153. 80's Yamaha G-100
  154. SVT3Pro power amp failure
  155. Blackstar series one 50 help
  156. bias issue
  157. Blues Jr oscillation-
  158. Rattling on Fender Red Knob Twin! What could be the cause?
  159. Single Ended Odd Distortion - To NFB or not to NFB?
  160. Fender Champion 30
  161. Ampeg B15 woes.... no sound from guitar
  162. Fender Roc 1000 changing channels when played.
  163. Marshall JCM 2000 trans wires
  164. Marshall DSL short ???
  165. Need 3 Prong Power Conversion - But Heater On Primary Side of Iso Trans
  166. Krankenstein Jr PT replacement?
  167. Marshall VS100 clean problem
  168. Need Bias Help VC50H by SLM Crate
  169. GK 400rb III, heatsink isolated screw
  170. B-15N Power transformer replacement
  171. Current problem with a 6534+
  172. Looking for info on Ampeg B4
  173. Dealing with High B+
  174. Marhsall 100watt 1959 SLP Oscillation?
  175. SVT CL repair - process and safety
  176. Prosonic drive channel week and nasty problem
  177. Fender Super Champ XD no sound
  178. Marshall DSL HELP !
  179. What is your favorite flush cutter?
  180. Mesa Blue Angel burned board
  181. ** The Marshall TSL122 JCM2000 Repair/Mods Page **
  182. Help With Squeal/Crosstalk...
  183. HUM Marshall JMP 50w
  184. hooking up a 3 wire power cabl
  185. Soldano Cuts out
  186. Peavey Valveking died
  187. 73 Fender Silverface Twin Reverb Noise New Findings & Questions
  188. Fender 1961 Concert Brown face 6g12a re-cap time, need input
  189. Twin Reverb PT Surface Temperature
  190. Weird residual voltage problem...
  191. 5e3 build buzzing/overtone noise
  192. Ashdown EVO 500 III Hum
  193. fender prosonic output transformer
  194. AC30 Normal channel ground loop fix
  195. Channel bleed JCM 800 2205
  196. Fender reverb driver transformer - green wire grounded?
  197. 60's VOX Berkely II - where is the reverb tank?
  198. 333xl infinium problem
  199. Transformer specs
  200. Could someone open their Boogie Mark III for me?
  201. Line 6 Spider II - noise and channel switching issue
  202. Peavey Penta Series 140 Watt Head - Need Schematic
  203. peavey 300ch
  204. 5150 II to orgininal 5150 spec mistake
  205. hum problem in new homebrew build
  206. Marshal TSL 60 channel switching from CRUNCH/OD1 to LEAD/OD2 problem
  207. problem with roland cube 20x
  208. How much hum is acceptable in a Fender Red Knob Twin
  209. behringer Xentyx 1222 fx psu help
  210. Kustom Lead iii sc ombo - reverb issue - need schematic
  211. MB Subway Rocket Overall Volume Seems Low for 20w
  212. Engl Powerball interesting problem.
  213. What is cr-3 in FENDER DEVILLE
  214. Random Noise generated in power output stage of Fender Super 112...new guy here
  215. High pitched whistle continues on Fender Red Knob Twin, I am getting desperate
  216. What Brand or Type of valve would you use for a Bass
  217. Acoustic schematic
  218. Kustom 150 run hot?
  219. 73 Fender Silverface Twin Reverb Schematic / Layout question ?
  220. Behringer Truth B2030A ICs
  221. Peavey Mace VT red plating and arching...ouch!
  222. Marshall 75 Nasty Problem
  223. who has the best prices on ends?
  224. Genz-Benz El Diablo 100
  225. Peavey VTM 60 Question
  226. Peavey Mace VT Power Tubes?
  227. Marshal TSL 60 channel switching from OD1 to OD2 problem
  228. yet another VS265 with troubles
  229. 5150 - No Sound. HELP!!!
  230. Frontman 212r (yes another one)
  231. Help needed for new ideas to solve Ampeg BA115 intermittent crackle issue
  232. Ampeg SVT CL
  233. 6G2 Princeton - Weird Oscillation Only When Trem is Off?
  234. Silverface Reverb Bias Issue
  235. Gallien Kreuger 1001RB mk II turn on thump
  236. Very loud intermittent amp problem.
  237. NFB wire diameter/gauge
  238. When OT Diagnostics Don't Help
  239. Is this risky?
  240. VOX AC30 - Bad distortion
  241. Reverb pop when the amp is on, and long starting vibrato
  242. Peavey Delta Blues issue...won't work
  243. MarshallJCM800 2210 hum
  244. mesa boogie f-100, loss of reverb
  245. Bad Reverb Transformer?
  246. Magnatone 213 bias question
  247. Laney LC50 MK2 Low Normal channel
  248. Boss CE-3 LED enigma
  249. 73 Fender Silverface Twin Reverb Voltages ,and Noise
  250. Bypassing Peavey Tubefex DSP / turning it analogue