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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Fishman Loudbox mini schem?
  2. Nomad 45: round 2
  3. Your shop rate and poilicies
  4. Egnater Rebel 20 power with no sound
  5. Mesa MK II excessive noise.
  6. Really unbalanced phase inverter?
  7. MESA Express 5:25 - high b+, high current draw on power tubes - normal?
  8. High B+ GZ34 deluxe reverb
  9. Weber 6H50 "Hiwatt" style amp. Howl and presence control issues
  10. What causes too high plate voltage?
  11. Orange Rocker 30, not so 30...
  12. SF Twin 135 speaker output wiring
  13. Problems with Laney DB300C bass amp
  14. JCM 800 Output Transformer
  15. Bogner Alchemist Schematic
  16. Kustom Lead-I Effects Not Working
  17. 70's Ampeg V2: need some maintenance help
  18. Hughes & Kettner Trilogy Head
  19. Ampeg VL-1002 fx loop problem
  20. Heathkit TA-17: power-stage resistor keeps blowing
  21. crate gx130c resistor overheating
  22. Testing a capacitor with an ohmmeter
  23. Ampeg SVT Trio intermittently dropping out.
  24. i have a crate gx130c resistors seem too hot
  25. 5u4gb or Gz34 Tube Rectifier and Hammond Transformers Deluxe ab763
  26. Bassman AB165 burned filament resistors
  27. Buzz if guitar near amp (not speaker) - normal?
  28. 70's Twin Reverb loud circuit disturbance during warmup
  29. Kitty Hawk Junior Hissy Fit!
  30. Vox AD30VT - is it too hot?
  31. need advice to spec power transformer
  32. Higher than expected current draw - Fender Pro Reverb Amp
  33. Deluxe AB763 buss bar grounding
  34. Marshall short
  35. Hammond 291BEX heater winding grounding
  36. Mackie SR1530 no output
  37. Marshall JCM800 Bias Problem
  38. Carvin X-60E problem - Loud distortion howling noise
  39. Deluxe Reverb AB763
  40. Blown 1 OHM current-sense resistors
  41. Acoustic G60T warbling decay
  42. Ampeg BA115-hpt amp. Mains hum + signal breaking up - but only when hot...
  43. Fender Super Six Reverb Re-Cap Question
  44. 18 watt plexi with 6v6's has squealing problem?
  45. CRATE BV amp Ch1 prob- "Crunchy" Noises.
  46. 76 ampeg V4 low output
  47. Crate Vintage Club 50 "cutting out".
  48. Effects Loop Mod Question
  49. Crate PA-B8350 Mains fuse size or schematic
  50. Acoustic 122 restoration
  51. Acoustic 270 tremolo
  52. Transformer making this (recorded) sound. Intermittent buzzing. Caps?
  53. Mesa Nomad 45 heater issue?
  54. Haze 15 - Noise
  55. Power tube bias and OT load...
  56. Jazz Chorus 77 powers up but no sound
  57. Crossover/Horn Trouble!
  58. Shot in the dark looking for schematic for old JVC Integrated Amp
  59. Decipher Marshall scem
  60. MF350 Mode Four musings, thoughts, comments
  61. Working through a Ampeg Super Echo Twin ET-2b
  62. Princeton 112 Plus - Shutdown MOD
  63. Marshall jcm 2000 dsl 401 problem.
  64. HARTKE A70 limitter issue
  65. Hartke LH500 head, 10 seconds of sound.
  66. 1972 Fender Super 6 Reverb - Volume Question
  67. Marshall Valvestate VS100
  68. Peavey Musician Mark 3 gut shots?
  69. Hartke A70 problem
  70. Redplating Tubes in Dumble Clone
  71. Fender TRS pedal issue
  72. 66 Ampeg J12-D
  73. Marshall Lead 100 Mosfet
  74. Rebel 20 wont bias up to spec, low constant hum
  75. Princeton 112 Plus - Intermittent "Popping"
  76. Need a new DMM. Advice?
  77. Crate BT50 Speaker Noise
  78. Peavey LTD 400 low volume distortion
  79. Wall Voltage AC
  80. Ampeg B5R premature decay of notes
  81. 1979 Ampeg V2 blowing main fuse at full volume only....
  82. Ampeg BA115 weird problem fixing poweramp
  83. Peavey 400 LTD Help
  84. Blues Deluxe switching problem
  85. Fender princeston 112 Plus Distorted clean channel
  86. Carlsbro GLX100 popping internal fuses
  87. Marshall DSL lowa bias 27ma 33ma max
  88. DC offset on b&k 3020 sweep / function generator
  89. ashdown peacemaker 40 schematic?
  90. Marshall 3520 bass amp help, blowing fuses...
  91. Ampeg SVT-6 Pro reading +64vdc on the speaker output.
  92. Randall RH 200 channels unbalanced
  93. Peavey D Blues
  94. Damn Generators!!
  95. Classic 50 410 sizzle and crackle
  96. please help me troubleshoot a fender fuzz wah reissue pr 739 pedal
  97. Micro phonic EL34's...common?
  98. Bass Potentiometer ?
  99. Vintage amp mod, 12ax7(ecc83) plus 2 ecl82
  100. Jbl eon510 help!!
  101. Peavey Classic 50
  102. Please Help Me Trouble Shoot 64 Bandmaster
  103. Fender amp intermittently "fading out"
  104. 6G7A output section needs help
  105. Modification to Ashdown 5.15
  106. Fender champion 30 dsp
  107. 5E3 noise issues
  108. Help ID transistor
  109. PV Delta Blues and C30
  110. Checkup On A Fender Tone Master 100W Head
  111. Electro music Leslie Unit connection
  112. KT88 failures
  113. 40+60w 16Ω speakers in a 212 cab= sounds bad
  114. ElectroVoice 100M POWERED Mixer
  115. Mesa M-pulse 600
  116. Orange RockerVerb 50 MkII - No Bias Voltage
  117. Problem with Fender M80 Chorus
  118. Reverb Hum in Gibson GA-19 RVT Falcon
  119. Blonde Bassman
  120. Output transformers and power tubes
  121. Mark Huss plexi with 6v6
  122. Marshall YJM100 schematic?
  123. TDA2030A -anyone experienced w this chip? Plus possible related issue
  124. Working on Bugera 6260 amp - Question about Tube Grade...
  125. Randall RH150 volume cutting
  126. JBL EON dissassembly?
  127. Trem help
  128. Bugera 333XL switching problem
  129. Fender Super 210 getting the best of me
  130. Need a new scope. USB scope used with a laptop ??
  131. Rath Amp Retro 50
  132. Alamo Futura
  133. Marshall Lead 12 5005
  134. Hot Rod Deluxe volume loss
  135. Orange OR80 fuse position
  136. Fender Deluxe VM blowing fuses immediately after taking off standby
  137. Grainger Valve Edition 5 Issues
  138. Line 6 Spider 112 50 Watts Problem
  139. Noob wants to work on Crate GX-30M input jack
  140. Variac carbon brush replacement
  141. Problem with high mAs...
  142. power transformer for Hiwatt Buldog Bass 20 cheapie amp
  143. Source for replacement 1M dual gang pot for JCM800
  144. Issues with a Acoustic B200H 200w Bass Head
  145. Spectra 225 PWR AMP 550-032 REV C
  146. Old Ampeg V2
  147. Capacitor aging question - Ceramics and Electrolytics
  148. Peavey Heritage Voice Coil rubbing sound
  149. Help/advice with new build poping at hi vol
  150. Mesa Express 2 25 low power?
  151. Goofy Voltages on New Tweed Harvard
  152. AC30TB 1989 Trem Troubleshoot
  153. deoxit? NO!
  154. Quiet Fans?
  155. Macro-tech 5000vz
  156. Amp Fuse
  157. Peavey Bandit-75 possible problem with distortion channel
  158. Marshall MA50 head no sound
  159. Oscope ?
  160. Crate GX-212 power amp puzzle
  161. Discharging Caps
  162. Ampeg V4 B H Imstumped
  163. Mesa Boogie MARK III
  164. DC on input jacks?
  165. Filament PT for Peavey 5150 needed
  166. Fender Red Knob Twin increases hum connecting preamp out and/or poweramp in
  167. blues deville sounds blah and thin
  168. 2004 Fender HRDlx Volume Loss
  169. Premier 120 screech
  170. 1st gen Krankenstein high pitched squeal
  171. Fender '65 RI Deluxe Reverb making noise
  172. Kustom 250 Tremolo Issues
  173. HRDlx Footswitch switches
  174. Fender Bassman 150
  175. Ampeg BA155 HPT How to open speaker enclosure
  176. RoHS and tubes
  177. Most common parts...
  178. Marshall AS100D Acoustic Amp reading -vdc on the speaker output(s)
  179. Stage 112se amp issues - revisited?
  180. SVT-2 Pro: Hum when Input UNplugged; SNARL coming out of STBY
  181. Peavey VTM 60...Lost Heaters?
  182. Hot Rod Deville III V1 reverb noise
  183. sunn 200s amp help
  184. Fender Deluxe 85 may be blown?
  185. ECC83 in inverter
  186. Fender Pro Reverb AA165
  187. plate voltage creeping up on a 1979 marshall 2203...
  188. Testing capacitor failure
  189. Fender Concert Power trans replacement
  190. Locked thread.
  191. Peavey Classic 50 - cracking and sizzling
  192. Help identify new hum on 2 1/2 year old 5e3 build
  193. Low signal at power tube input grids (Marshall TSL JCM200)
  194. Bugera 333XL - where should these loose resistors go?
  195. Yamaha G50 112 III protection circuit
  196. Ampeg SVT plate voltages
  197. Fender Pro reverb 1966... Real dumb question but I got to ask
  198. Peavey 6505+ 112 blows main fuse
  199. Reducing noise in homebrew amp
  200. Peavey Mace VT ?
  201. Converting a Mesa Boogie Studio 22 (or 22+) from 120 to 240 volts is very easy
  202. Question about digital rotary controls
  203. Aria Pro AG30 tube amp...anyone familiar with
  204. Arc between filament and plate
  205. Marshall TSL100 Channel/Switching Problems
  206. Jc120 channel 2 not working - extra switch?
  207. Classic Tone Transformers ?
  208. Orange Rocker 30 OT Replacement
  209. Crate Vintage Club 50 - advice please
  210. Parts for GK 800RB
  211. Hum balance pot in Marshal 1987x reissue amp emits FIRE
  212. Voltage ratio on this output transformer isn't making sense
  213. Engl Blackmore E650 crackling noise
  214. Sunn Alpha 112 PR
  215. OK New issue with JJ tubes!
  216. Weird, Weird stuff with the PT of a Twin, Secondary Voltage.
  217. Ok so who the heck makes a good 6L6 anymore?
  218. Hartke 3500 - Snap, Crackle & Pop
  219. JCM 2000 DSL100 crackling and popping... sometimes.
  220. Troubleshooting a Champion 600
  221. 4560 IC chips
  222. Peavey Artist VT Fades Out
  223. Egnater tweaker 15 combo has lost the master volume, could use some sugestions
  224. marshall avt150h no sound
  225. How to spec replacement OT?
  226. SVT-2PRO Bias Problem: LEDs stay red on one side
  227. Must find replacement power transformer!
  228. HRD V1 troubles no output? Advice needed
  229. Output transformer issue
  230. 2 questions . How do i test decoupling caps and my output for wattage
  231. carlsbro cs40-60 mk1 output tx issue
  232. Anyone have experience with a Fender Champ 12?
  233. Any procedure to test around an output transformer?
  234. Crate Blue Voodoo BV120H on the bench
  235. Peavey Mace Footswitch LEDs ?
  236. 6G3(-ish) Amp Popping Fuses--Need Ideas!
  237. Finished 6G6 Build - But No Bass Response on Bass CH & Too Much Bass on Norman CH
  238. Marshall 1923C ( DSL 50) blows HT fuse
  239. What could this farty little distortion be caused by
  240. HotRod crappiness
  241. Acoustic B200H Service Manual?
  242. Early 80's roland cube 100- Orange
  243. Line 6 Spider Valve HD100 (Bogner) TROUBLE- No output
  244. Peavey Classic 212 VT
  245. Gibson GA45RVT reverb died.
  246. TOA P2122 Schematic?
  247. Roland Cube 60 intermittent internal popping
  248. Roland re201 echo problem
  249. Edison Professional Powered Speaker System
  250. Vox Cambridge 15 and Cambridge 30 reliability upgrades, mods, and tweaks