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View Full Version : Maintenance, Troubleshooting & Repair



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  1. RoHS and tubes
  2. Most common parts...
  3. Marshall AS100D Acoustic Amp reading -vdc on the speaker output(s)
  4. Stage 112se amp issues - revisited?
  5. SVT-2 Pro: Hum when Input UNplugged; SNARL coming out of STBY
  6. Peavey VTM 60...Lost Heaters?
  7. Hot Rod Deville III V1 reverb noise
  8. sunn 200s amp help
  9. Fender Deluxe 85 may be blown?
  10. ECC83 in inverter
  11. Fender Pro Reverb AA165
  12. plate voltage creeping up on a 1979 marshall 2203...
  13. Testing capacitor failure
  14. Fender Concert Power trans replacement
  15. Locked thread.
  16. Peavey Classic 50 - cracking and sizzling
  17. Help identify new hum on 2 1/2 year old 5e3 build
  18. Low signal at power tube input grids (Marshall TSL JCM200)
  19. Bugera 333XL - where should these loose resistors go?
  20. Yamaha G50 112 III protection circuit
  21. Ampeg SVT plate voltages
  22. Fender Pro reverb 1966... Real dumb question but I got to ask
  23. Peavey 6505+ 112 blows main fuse
  24. Reducing noise in homebrew amp
  25. Peavey Mace VT ?
  26. Converting a Mesa Boogie Studio 22 (or 22+) from 120 to 240 volts is very easy
  27. Question about digital rotary controls
  28. Aria Pro AG30 tube amp...anyone familiar with
  29. Arc between filament and plate
  30. Marshall TSL100 Channel/Switching Problems
  31. Jc120 channel 2 not working - extra switch?
  32. Classic Tone Transformers ?
  33. Orange Rocker 30 OT Replacement
  34. Crate Vintage Club 50 - advice please
  35. Parts for GK 800RB
  36. Hum balance pot in Marshal 1987x reissue amp emits FIRE
  37. Voltage ratio on this output transformer isn't making sense
  38. Engl Blackmore E650 crackling noise
  39. Sunn Alpha 112 PR
  40. OK New issue with JJ tubes!
  41. Weird, Weird stuff with the PT of a Twin, Secondary Voltage.
  42. Ok so who the heck makes a good 6L6 anymore?
  43. Hartke 3500 - Snap, Crackle & Pop
  44. JCM 2000 DSL100 crackling and popping... sometimes.
  45. Troubleshooting a Champion 600
  46. 4560 IC chips
  47. Peavey Artist VT Fades Out
  48. Egnater tweaker 15 combo has lost the master volume, could use some sugestions
  49. marshall avt150h no sound
  50. How to spec replacement OT?
  51. SVT-2PRO Bias Problem: LEDs stay red on one side
  52. Must find replacement power transformer!
  53. HRD V1 troubles no output? Advice needed
  54. Output transformer issue
  55. 2 questions . How do i test decoupling caps and my output for wattage
  56. carlsbro cs40-60 mk1 output tx issue
  57. Anyone have experience with a Fender Champ 12?
  58. Any procedure to test around an output transformer?
  59. Crate Blue Voodoo BV120H on the bench
  60. Peavey Mace Footswitch LEDs ?
  61. 6G3(-ish) Amp Popping Fuses--Need Ideas!
  62. Finished 6G6 Build - But No Bass Response on Bass CH & Too Much Bass on Norman CH
  63. Marshall 1923C ( DSL 50) blows HT fuse
  64. What could this farty little distortion be caused by
  65. HotRod crappiness
  66. Acoustic B200H Service Manual?
  67. Early 80's roland cube 100- Orange
  68. Line 6 Spider Valve HD100 (Bogner) TROUBLE- No output
  69. Peavey Classic 212 VT
  70. Gibson GA45RVT reverb died.
  71. TOA P2122 Schematic?
  72. Roland Cube 60 intermittent internal popping
  73. Roland re201 echo problem
  74. Edison Professional Powered Speaker System
  75. Vox Cambridge 15 and Cambridge 30 reliability upgrades, mods, and tweaks
  76. Ampeg Portflex B-12XT Power tx
  77. Garnet Mini Bass tremolo repair
  78. Orange 200 thunderverb - tube failure
  79. Fender SRM 6302 PA bad hum
  80. Negative Feedback Question
  81. Marshall Vasvestate VS100R Head
  82. Kustom 4 terminal pots
  83. 12AT7 in Univox U-255R runs scalding hot.
  84. Mesa MkV unusual problem
  85. Matching BJT differential pair
  86. Schematic Help Needed Fender Stage 160 DSP
  87. DIY patch cables, major signal loss - what gives??
  88. Head scratcher: 5150 combo bias mod screweyness
  89. Fender Princeton AA1164 1K b+ dropping resistor cooks
  90. Power amp ok on resistive load, but not with speaker
  91. SWR 400 Working Pro
  92. Vox Cambridge 30 Reverb busted
  93. What the ?????
  94. LM3886T Mute Circuit
  95. Valvetech chassis pics
  96. Fender Twin Reissue - No Power, Good Fuses, Inrush Limiter Seems OK
  97. Bogner ecsstacy help please, tubes red plating
  98. Hughes and Kettner 6L6 Guitar Valve Amp- Oscillation/ Rattle/ Reverb Issue
  99. Is this right?
  100. Orange Thunderverb 50 bias - PLEASE HELP!!
  101. Thank you
  102. Ampeg superbreverb Variable Bias Trem/(vibrato) thump all the time, footswitch good
  103. Fender 75
  104. Behringer Amps and Isolated Jacks
  105. Evans Lapsteel amp Fault
  106. VOX AC30/6 TB problems
  107. Output Transformer works but totally cool
  108. Staticy Woosh when turning off standby, background grit: Rivera Fandango 55
  109. 40 watt Sunn amp sounds great but lacks power
  110. Ashdown chassis removal
  111. Marshall 2020 transformer reliability
  112. BA-115HPT
  113. Recommendations for a good epoxy to repair a circuit board
  114. transitor substitution help
  115. Bias probes ?? UK supplier?
  116. Hartke HA-3500 farty noise
  117. 1959 Superlead sounding bad after can cap job
  118. Weber copper cap rectifier - Blown?
  119. Bogner Shiva - reverb issue
  120. Fender optoisolator tremolo ticking/clicking
  121. 1953 Gibson BR9-GA9 hybrid model Low output volume
  122. usa built blues deville 4x10 footswitch problem
  123. Volume fading in and out on a Peavey Vyper 75w combo amp
  124. jcm900 high gain dual reverb very low volume
  125. Fender Red Knob Twin (1987-1994) aka THE TWIN upgrades
  126. Another -15v supply problem!
  127. Fender the twin (1990's) 250k 16mm PDT pots
  128. scope help
  129. Behringer ACX1000 schem?
  130. Music Man 2165-RD Voltage Issue
  131. Bose System L1 Compact Power Stand
  132. Fender Hotrod deluxe noise like popcorn
  133. Got a Crown CE2000 Semi Fixed, Beginner looking for advice
  134. Mojotone CTS pots?
  135. Re-coating burned through PCB trace coating?
  136. Fender Super Reverb RI heating up
  137. NO CHANNEL 2 on MUCH BELOVED FENDER SUPER CHAMP XD.
  138. Laney VC30 112 bias problem (?)
  139. Reverb Tank reqd foruse as test equipment
  140. Plush P1000s on the bench
  141. Svt3 Pro Mosfets
  142. Gallien-Krueger 700RB
  143. Film capacitor
  144. New reverb tank needed?
  145. Replacement knobs for Champion 110 Amplifier
  146. What does this mod do? VH100R
  147. Cant find a OT for DSL401
  148. Gibson Apollo (GA-95RVT) AKA: Nightmare.
  149. Phase inverter, Mesa Boogie SOB
  150. Marshall JCM600 Head Drive channel low volume
  151. Vibrato channel no sound .
  152. How do I easily remove silicone sealant?
  153. Farfisa compact organ.
  154. Semi noisy carvin cx1272
  155. George L's Speaker cables ?
  156. Looking for ED combo amp schematic
  157. Brand new preamp tubes seem to be bad ?
  158. Bench supply recommendations
  159. How do I make this 'widowmaker' safe?
  160. Cathode bypass caps in Bassman 135
  161. '65 SR tranny ticking
  162. How do I rust new screws?
  163. Scratchy, Popping, Distortion in new Pro-Reverb build.
  164. Peavey rockmaster pre amp problems
  165. Hot Rod Deville III V1 random noise and oscillation.
  166. Need good amp tech in DFW area
  167. US Masters TVA30 schematic anyone?
  168. Marshall 6100
  169. HiWatt G15 8 MaxWatt - Gone Silent, chip details needed
  170. Cornford hurricane Blown Mains TX 2nd time
  171. Sessionette Power Amp Replacement
  172. Kustom K250-2
  173. Another MARSHALL Valvestate 2000 AVT150 Blowing fuses......
  174. Peavey Special 2x12 power supply is bad is this an easy fix
  175. Is this scope worth a nickel?
  176. Mesa 50 cal fried resistors continued
  177. Marshall VS 8080 IC1 Blowing.
  178. Quality workmanship.....
  179. What was the hardest problem you ever found and fixed?
  180. Deluxe Reverb schematic discrepancies?
  181. Fender Chamion DSP 30 Channel 2 has no volume control
  182. Best Way To Clean Off Green Powder Dust Off Old Chassis?
  183. 969 Ampeg SVT being snappy
  184. Vintage PA Tube Head Output Question
  185. Marshall 2100 JCM 900 Head Hum
  186. Question about 50s Fender OT ID
  187. JCM 800 2204 Self oscillation problem
  188. Bleed Resistor to Discharge High Voltage Caps in Tube Amp
  189. Crate v18 212 amp wont turn on anymore???
  190. Marshall 8008 Rack mount Blowing transistors
  191. Hughes and Kettner Switch Blade 100 guitar head
  192. 4.6V heater voltage on Fender Pro Tube Twin
  193. blues deluxe 1993 not the reissue
  194. Laney L30B Hums, Blows Fuses
  195. Buzzing first minute or so, Laney VH100R
  196. Sunn Beta Lead - Random but relatively constant crackle on output
  197. Marshall 2100 JCM 900 head oscillating
  198. No volume with Peavey XXL with effects loop in use.
  199. HELP With VOX AC100CPH
  200. Hughes and Kettner Switch Blade 100 guitar head
  201. Fender Hot Rod Deluxe 3
  202. Hum/Buzz When Power Transformer is Grounded to Chassis
  203. 100uf + 100uf caps bigger than 35mm
  204. Anyone Up For A Vintage Tube Swap?
  205. Fuse differences
  206. Fender Hot Rod Deluxe - weird noise on Drive channel
  207. Roland - JC77 potentiometer replacement
  208. SF Twin Reverb with buzzy reverb
  209. Crate VC6210 popped NTC before fuse, need advice..
  210. TSL-60 with vexing farting problem on all channels
  211. Mesa .50 Caliber + Fried resistors
  212. Cornford Hurriance blown tx again
  213. Fender Deluxe 5C3 question
  214. Need help finding pots for Hartke repair
  215. samson s6 distorted output
  216. I Thought It Was a Ground Loop
  217. Ampeg B-200R Dc on output
  218. bad tube with bizarre symptom
  219. PEAVEY XXL head won't switch channels
  220. Peavey 212 clean channel won't work
  221. Plush P1000s on the bench
  222. Strong oscillation in Reverberocket Echo circuit
  223. Fender 6G6-B Bassman hum
  224. Fender Performer 1000 popping on turn-off
  225. Replacement potentiometer for Fender Red Knob Twin
  226. Just shooting the breeze Carvin 400FET
  227. Carlsbro Powerine 800 voltages
  228. Crate Blue Voodoo
  229. SF Twin Reverb Vibrato Hum on Speed Pot??
  230. PV XR600 400R links?
  231. Traynor YCV40 Blown DC Filament Circuit
  232. Circuit diagram for Roland KC-500?
  233. Crate GXT-100W circuit diagram?
  234. Fender Hot Rod Deluxe Issue
  235. SWR LA-15 Stumped
  236. Fender Rumble 100 Bass Amp Problems- Help, Please.
  237. 1974 Garnet stencil 10-PT - AC isolation mod
  238. Cornford hurricane schematic
  239. Ampeg Gemini II 7591 bias questions
  240. Ampeg Gemini II Tone stack question
  241. HK switchblade 50W combo repair
  242. What is wrong with NTE transistors?
  243. Ampeg SVT-300 bias
  244. Amp Static Crackling noises SOUND CLIP ATTACHED
  245. Tweed Bassman clone with harsh breakup
  246. Marshall tsl 100 head loud Clean Channel Hum after it heats up after few minutes on
  247. No volume with Crate GLX1200H
  248. musicman mystery tap
  249. channel switching help (problem with amp)
  250. preamp valve weirdness