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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Another -15v supply problem!
  2. Fender the twin (1990's) 250k 16mm PDT pots
  3. scope help
  4. Behringer ACX1000 schem?
  5. Music Man 2165-RD Voltage Issue
  6. Bose System L1 Compact Power Stand
  7. Fender Hotrod deluxe noise like popcorn
  8. Got a Crown CE2000 Semi Fixed, Beginner looking for advice
  9. Mojotone CTS pots?
  10. Re-coating burned through PCB trace coating?
  11. Fender Super Reverb RI heating up
  12. NO CHANNEL 2 on MUCH BELOVED FENDER SUPER CHAMP XD.
  13. Laney VC30 112 bias problem (?)
  14. Reverb Tank reqd foruse as test equipment
  15. Plush P1000s on the bench
  16. Svt3 Pro Mosfets
  17. Gallien-Krueger 700RB
  18. Film capacitor
  19. New reverb tank needed?
  20. Replacement knobs for Champion 110 Amplifier
  21. What does this mod do? VH100R
  22. Cant find a OT for DSL401
  23. Gibson Apollo (GA-95RVT) AKA: Nightmare.
  24. Phase inverter, Mesa Boogie SOB
  25. Marshall JCM600 Head Drive channel low volume
  26. Vibrato channel no sound .
  27. How do I easily remove silicone sealant?
  28. Farfisa compact organ.
  29. Semi noisy carvin cx1272
  30. George L's Speaker cables ?
  31. Looking for ED combo amp schematic
  32. Brand new preamp tubes seem to be bad ?
  33. Bench supply recommendations
  34. How do I make this 'widowmaker' safe?
  35. Cathode bypass caps in Bassman 135
  36. '65 SR tranny ticking
  37. How do I rust new screws?
  38. Scratchy, Popping, Distortion in new Pro-Reverb build.
  39. Peavey rockmaster pre amp problems
  40. Hot Rod Deville III V1 random noise and oscillation.
  41. Need good amp tech in DFW area
  42. US Masters TVA30 schematic anyone?
  43. Marshall 6100
  44. HiWatt G15 8 MaxWatt - Gone Silent, chip details needed
  45. Cornford hurricane Blown Mains TX 2nd time
  46. Sessionette Power Amp Replacement
  47. Kustom K250-2
  48. Another MARSHALL Valvestate 2000 AVT150 Blowing fuses......
  49. Peavey Special 2x12 power supply is bad is this an easy fix
  50. Is this scope worth a nickel?
  51. Mesa 50 cal fried resistors continued
  52. Marshall VS 8080 IC1 Blowing.
  53. Quality workmanship.....
  54. What was the hardest problem you ever found and fixed?
  55. Deluxe Reverb schematic discrepancies?
  56. Fender Chamion DSP 30 Channel 2 has no volume control
  57. Best Way To Clean Off Green Powder Dust Off Old Chassis?
  58. 969 Ampeg SVT being snappy
  59. Vintage PA Tube Head Output Question
  60. Marshall 2100 JCM 900 Head Hum
  61. Question about 50s Fender OT ID
  62. JCM 800 2204 Self oscillation problem
  63. Bleed Resistor to Discharge High Voltage Caps in Tube Amp
  64. Crate v18 212 amp wont turn on anymore???
  65. Marshall 8008 Rack mount Blowing transistors
  66. Hughes and Kettner Switch Blade 100 guitar head
  67. 4.6V heater voltage on Fender Pro Tube Twin
  68. blues deluxe 1993 not the reissue
  69. Laney L30B Hums, Blows Fuses
  70. Buzzing first minute or so, Laney VH100R
  71. Sunn Beta Lead - Random but relatively constant crackle on output
  72. Marshall 2100 JCM 900 head oscillating
  73. No volume with Peavey XXL with effects loop in use.
  74. HELP With VOX AC100CPH
  75. Hughes and Kettner Switch Blade 100 guitar head
  76. Fender Hot Rod Deluxe 3
  77. Hum/Buzz When Power Transformer is Grounded to Chassis
  78. 100uf + 100uf caps bigger than 35mm
  79. Anyone Up For A Vintage Tube Swap?
  80. Fuse differences
  81. Fender Hot Rod Deluxe - weird noise on Drive channel
  82. Roland - JC77 potentiometer replacement
  83. SF Twin Reverb with buzzy reverb
  84. Crate VC6210 popped NTC before fuse, need advice..
  85. TSL-60 with vexing farting problem on all channels
  86. Mesa .50 Caliber + Fried resistors
  87. Cornford Hurriance blown tx again
  88. Fender Deluxe 5C3 question
  89. Need help finding pots for Hartke repair
  90. samson s6 distorted output
  91. I Thought It Was a Ground Loop
  92. Ampeg B-200R Dc on output
  93. bad tube with bizarre symptom
  94. PEAVEY XXL head won't switch channels
  95. Peavey 212 clean channel won't work
  96. Plush P1000s on the bench
  97. Strong oscillation in Reverberocket Echo circuit
  98. Fender 6G6-B Bassman hum
  99. Fender Performer 1000 popping on turn-off
  100. Replacement potentiometer for Fender Red Knob Twin
  101. Just shooting the breeze Carvin 400FET
  102. Carlsbro Powerine 800 voltages
  103. Crate Blue Voodoo
  104. SF Twin Reverb Vibrato Hum on Speed Pot??
  105. PV XR600 400R links?
  106. Traynor YCV40 Blown DC Filament Circuit
  107. Circuit diagram for Roland KC-500?
  108. Crate GXT-100W circuit diagram?
  109. Fender Hot Rod Deluxe Issue
  110. SWR LA-15 Stumped
  111. Fender Rumble 100 Bass Amp Problems- Help, Please.
  112. 1974 Garnet stencil 10-PT - AC isolation mod
  113. Cornford hurricane schematic
  114. Ampeg Gemini II 7591 bias questions
  115. Ampeg Gemini II Tone stack question
  116. HK switchblade 50W combo repair
  117. What is wrong with NTE transistors?
  118. Ampeg SVT-300 bias
  119. Amp Static Crackling noises SOUND CLIP ATTACHED
  120. Tweed Bassman clone with harsh breakup
  121. Marshall tsl 100 head loud Clean Channel Hum after it heats up after few minutes on
  122. No volume with Crate GLX1200H
  123. musicman mystery tap
  124. channel switching help (problem with amp)
  125. preamp valve weirdness
  126. Mesa F100 blowing single tube, in same socket, every time
  127. Twin reverb boost oscillation
  128. hartke ha7000
  129. Bugera 333xl-212 cap problem
  130. Could this cause my issue?
  131. Marshall Connector Identification
  132. 6V6 amp cutting out when guitars strings are picked hard
  133. Hafler G300 clipping on negative portion of waveform
  134. 80's Yamaha G-100
  135. SVT3Pro power amp failure
  136. Blackstar series one 50 help
  137. bias issue
  138. Blues Jr oscillation-
  139. Rattling on Fender Red Knob Twin! What could be the cause?
  140. Single Ended Odd Distortion - To NFB or not to NFB?
  141. Fender Champion 30
  142. Ampeg B15 woes.... no sound from guitar
  143. Fender Roc 1000 changing channels when played.
  144. Marshall JCM 2000 trans wires
  145. Marshall DSL short ???
  146. Need 3 Prong Power Conversion - But Heater On Primary Side of Iso Trans
  147. Krankenstein Jr PT replacement?
  148. Marshall VS100 clean problem
  149. Need Bias Help VC50H by SLM Crate
  150. GK 400rb III, heatsink isolated screw
  151. B-15N Power transformer replacement
  152. Current problem with a 6534+
  153. Looking for info on Ampeg B4
  154. Dealing with High B+
  155. Marhsall 100watt 1959 SLP Oscillation?
  156. SVT CL repair - process and safety
  157. Prosonic drive channel week and nasty problem
  158. Fender Super Champ XD no sound
  159. Marshall DSL HELP !
  160. What is your favorite flush cutter?
  161. Mesa Blue Angel burned board
  162. ** The Marshall TSL122 JCM2000 Repair/Mods Page **
  163. Help With Squeal/Crosstalk...
  164. HUM Marshall JMP 50w
  165. hooking up a 3 wire power cabl
  166. Soldano Cuts out
  167. Peavey Valveking died
  168. 73 Fender Silverface Twin Reverb Noise New Findings & Questions
  169. Fender 1961 Concert Brown face 6g12a re-cap time, need input
  170. Twin Reverb PT Surface Temperature
  171. Weird residual voltage problem...
  172. 5e3 build buzzing/overtone noise
  173. Ashdown EVO 500 III Hum
  174. fender prosonic output transformer
  175. AC30 Normal channel ground loop fix
  176. Channel bleed JCM 800 2205
  177. Fender reverb driver transformer - green wire grounded?
  178. 60's VOX Berkely II - where is the reverb tank?
  179. 333xl infinium problem
  180. Transformer specs
  181. Could someone open their Boogie Mark III for me?
  182. Line 6 Spider II - noise and channel switching issue
  183. Peavey Penta Series 140 Watt Head - Need Schematic
  184. peavey 300ch
  185. 5150 II to orgininal 5150 spec mistake
  186. hum problem in new homebrew build
  187. Marshal TSL 60 channel switching from CRUNCH/OD1 to LEAD/OD2 problem
  188. problem with roland cube 20x
  189. How much hum is acceptable in a Fender Red Knob Twin
  190. behringer Xentyx 1222 fx psu help
  191. Kustom Lead iii sc ombo - reverb issue - need schematic
  192. MB Subway Rocket Overall Volume Seems Low for 20w
  193. Engl Powerball interesting problem.
  194. What is cr-3 in FENDER DEVILLE
  195. Random Noise generated in power output stage of Fender Super 112...new guy here
  196. High pitched whistle continues on Fender Red Knob Twin, I am getting desperate
  197. What Brand or Type of valve would you use for a Bass
  198. Acoustic schematic
  199. Kustom 150 run hot?
  200. 73 Fender Silverface Twin Reverb Schematic / Layout question ?
  201. Behringer Truth B2030A ICs
  202. Peavey Mace VT red plating and arching...ouch!
  203. Marshall 75 Nasty Problem
  204. who has the best prices on ends?
  205. Genz-Benz El Diablo 100
  206. Peavey VTM 60 Question
  207. Peavey Mace VT Power Tubes?
  208. Marshal TSL 60 channel switching from OD1 to OD2 problem
  209. yet another VS265 with troubles
  210. 5150 - No Sound. HELP!!!
  211. Frontman 212r (yes another one)
  212. Help needed for new ideas to solve Ampeg BA115 intermittent crackle issue
  213. Ampeg SVT CL
  214. 6G2 Princeton - Weird Oscillation Only When Trem is Off?
  215. Silverface Reverb Bias Issue
  216. Gallien Kreuger 1001RB mk II turn on thump
  217. Very loud intermittent amp problem.
  218. NFB wire diameter/gauge
  219. When OT Diagnostics Don't Help
  220. Is this risky?
  221. VOX AC30 - Bad distortion
  222. Reverb pop when the amp is on, and long starting vibrato
  223. Peavey Delta Blues issue...won't work
  224. MarshallJCM800 2210 hum
  225. mesa boogie f-100, loss of reverb
  226. Bad Reverb Transformer?
  227. Magnatone 213 bias question
  228. Laney LC50 MK2 Low Normal channel
  229. Boss CE-3 LED enigma
  230. 73 Fender Silverface Twin Reverb Voltages ,and Noise
  231. Bypassing Peavey Tubefex DSP / turning it analogue
  232. Peavey Mace channel switching problem ?
  233. Behringer MDX 212
  234. sunn beta lead, choked, low, farty output
  235. Mackie Snap crackle and pop
  236. 6U10 hummm
  237. Roland JC-120 circuit help
  238. Laney LC50 MK2 Schematic reqd
  239. Fender 80s "II" series amps vactrol ratings?
  240. SWR 350 Bass Howling
  241. Line 6 spider 212
  242. HH Bass Machine
  243. Mesa Boogie Road King - strange distortion in outpout stage
  244. Speaker-related dumb question: speaker SIZE
  245. Speaker Protection help
  246. Univox Bias questions HIGH VOLTAGE!!!
  247. Midi Problem: Loose all programs when turning off amp
  248. AC filaments too hot!
  249. Princeton Problem
  250. Marshall DSL 50 still passing signal with the volumes on 0?