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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Univox U-1101
  2. Mesa Tremoverb EQ change when using reverb
  3. Fender Hot Rod Deluxe Problem
  4. continuous power handling
  5. 5150 Block Letter with a strange Bias Mod?
  6. WEM Dominator/ Ch2 not working.
  7. Gibson 20-T squeal
  8. Replacing 2 prong power cord in vintage amp
  9. Fishman Loudbox Performer Heat issues.
  10. oil problem
  11. Variable Capacitor in '60s Airline Amp
  12. Ampeg BA115 very loud humming sound
  13. Enzo
  14. Link ch1 to MV? [ Crate Bv-omfg]. Plan B!
  15. Workman Transitest
  16. nevermind...found it
  17. Cabinet for Deluxe Reverb AB763 Combo - Europe based supliers
  18. Peavey DTH 218 sub
  19. Crackling
  20. Aguilar DB750 trouble!
  21. Sovtek MIG50 odd power tube draw
  22. Ampeg SVT 4Pro equalizer circuit problem
  23. ROLAND JC120
  24. Harbinger HP215 schematic needed
  25. Marshall JCM2000 DSL100
  26. Legend A30 humming
  27. New Weber Legacys in Hot Rod Deville - Does this look right....??
  28. JMF Spectra 30-T Bias issues
  29. Bandmaster AB763 Problem
  30. Ampeg V-6B Transistor Substitutions
  31. Tweed Deluxe Clone sounds Thin and Weak Help Please!
  32. Peavey 450 Tour
  33. Peavey Session 400 Headroom
  34. 70's Peavey Bass 400 module problem
  35. Mesa still Blowing fuses.
  36. Bias voltage too low...?
  37. Sovtek MIG 50 blowing fuses
  38. epiphone triggerman 100h weird problem
  39. Reverb "hum" in Marshall VS100
  40. dumb question
  41. Orange Tiny Terrorist
  42. Paul pepco model 201 isolation transformer
  43. Intermittent red plating on standby
  44. Traynor YBA-1 issues
  45. 60 hz hum
  46. Help with a 68 Sunn Sentura II
  47. Vintage Traynor YGM-3 Tremolo Issue
  48. Proper posture for bench repair?
  49. Volume Potentiometer - RCF ARTxxx
  50. anyone with screen grid voltage higher than plate voltage in Deluxe reverb?
  51. BIAS Deluxe Reverb High B+ AB763
  52. [ 'Dead CRATE BV- need help! ]
  53. Trace AH500 and the rare Mosfets
  54. newish Mesa DR
  55. Well THAT was different
  56. Fender Hot Rod DeVille 2x12 Low Volume
  57. Elementary Fender Twin Bias adjustment
  58. Fishman Loudbox mini schem?
  59. Nomad 45: round 2
  60. Your shop rate and poilicies
  61. Egnater Rebel 20 power with no sound
  62. Mesa MK II excessive noise.
  63. Really unbalanced phase inverter?
  64. MESA Express 5:25 - high b+, high current draw on power tubes - normal?
  65. High B+ GZ34 deluxe reverb
  66. Weber 6H50 "Hiwatt" style amp. Howl and presence control issues
  67. What causes too high plate voltage?
  68. Orange Rocker 30, not so 30...
  69. SF Twin 135 speaker output wiring
  70. Problems with Laney DB300C bass amp
  71. JCM 800 Output Transformer
  72. Bogner Alchemist Schematic
  73. Kustom Lead-I Effects Not Working
  74. 70's Ampeg V2: need some maintenance help
  75. Hughes & Kettner Trilogy Head
  76. Ampeg VL-1002 fx loop problem
  77. Heathkit TA-17: power-stage resistor keeps blowing
  78. crate gx130c resistor overheating
  79. Testing a capacitor with an ohmmeter
  80. Ampeg SVT Trio intermittently dropping out.
  81. i have a crate gx130c resistors seem too hot
  82. 5u4gb or Gz34 Tube Rectifier and Hammond Transformers Deluxe ab763
  83. Bassman AB165 burned filament resistors
  84. Buzz if guitar near amp (not speaker) - normal?
  85. 70's Twin Reverb loud circuit disturbance during warmup
  86. Kitty Hawk Junior Hissy Fit!
  87. Vox AD30VT - is it too hot?
  88. need advice to spec power transformer
  89. Higher than expected current draw - Fender Pro Reverb Amp
  90. Deluxe AB763 buss bar grounding
  91. Marshall short
  92. Hammond 291BEX heater winding grounding
  93. Mackie SR1530 no output
  94. Marshall JCM800 Bias Problem
  95. Carvin X-60E problem - Loud distortion howling noise
  96. Deluxe Reverb AB763
  97. Blown 1 OHM current-sense resistors
  98. Acoustic G60T warbling decay
  99. Ampeg BA115-hpt amp. Mains hum + signal breaking up - but only when hot...
  100. Fender Super Six Reverb Re-Cap Question
  101. 18 watt plexi with 6v6's has squealing problem?
  102. CRATE BV amp Ch1 prob- "Crunchy" Noises.
  103. 76 ampeg V4 low output
  104. Crate Vintage Club 50 "cutting out".
  105. Effects Loop Mod Question
  106. Crate PA-B8350 Mains fuse size or schematic
  107. Acoustic 122 restoration
  108. Acoustic 270 tremolo
  109. Transformer making this (recorded) sound. Intermittent buzzing. Caps?
  110. Mesa Nomad 45 heater issue?
  111. Haze 15 - Noise
  112. Power tube bias and OT load...
  113. Jazz Chorus 77 powers up but no sound
  114. Crossover/Horn Trouble!
  115. Shot in the dark looking for schematic for old JVC Integrated Amp
  116. Decipher Marshall scem
  117. MF350 Mode Four musings, thoughts, comments
  118. Working through a Ampeg Super Echo Twin ET-2b
  119. Princeton 112 Plus - Shutdown MOD
  120. Marshall jcm 2000 dsl 401 problem.
  121. HARTKE A70 limitter issue
  122. Hartke LH500 head, 10 seconds of sound.
  123. 1972 Fender Super 6 Reverb - Volume Question
  124. Marshall Valvestate VS100
  125. Peavey Musician Mark 3 gut shots?
  126. Hartke A70 problem
  127. Redplating Tubes in Dumble Clone
  128. Fender TRS pedal issue
  129. 66 Ampeg J12-D
  130. Marshall Lead 100 Mosfet
  131. Rebel 20 wont bias up to spec, low constant hum
  132. Princeton 112 Plus - Intermittent "Popping"
  133. Need a new DMM. Advice?
  134. Crate BT50 Speaker Noise
  135. Peavey LTD 400 low volume distortion
  136. Wall Voltage AC
  137. Ampeg B5R premature decay of notes
  138. 1979 Ampeg V2 blowing main fuse at full volume only....
  139. Ampeg BA115 weird problem fixing poweramp
  140. Peavey 400 LTD Help
  141. Blues Deluxe switching problem
  142. Fender princeston 112 Plus Distorted clean channel
  143. Carlsbro GLX100 popping internal fuses
  144. Marshall DSL lowa bias 27ma 33ma max
  145. DC offset on b&k 3020 sweep / function generator
  146. ashdown peacemaker 40 schematic?
  147. Marshall 3520 bass amp help, blowing fuses...
  148. Ampeg SVT-6 Pro reading +64vdc on the speaker output.
  149. Randall RH 200 channels unbalanced
  150. Peavey D Blues
  151. Damn Generators!!
  152. Classic 50 410 sizzle and crackle
  153. please help me troubleshoot a fender fuzz wah reissue pr 739 pedal
  154. Micro phonic EL34's...common?
  155. Bass Potentiometer ?
  156. Vintage amp mod, 12ax7(ecc83) plus 2 ecl82
  157. Jbl eon510 help!!
  158. Peavey Classic 50
  159. Please Help Me Trouble Shoot 64 Bandmaster
  160. Fender amp intermittently "fading out"
  161. 6G7A output section needs help
  162. Modification to Ashdown 5.15
  163. Fender champion 30 dsp
  164. 5E3 noise issues
  165. Help ID transistor
  166. PV Delta Blues and C30
  167. Checkup On A Fender Tone Master 100W Head
  168. Electro music Leslie Unit connection
  169. KT88 failures
  170. 40+60w 16Ω speakers in a 212 cab= sounds bad
  171. ElectroVoice 100M POWERED Mixer
  172. Mesa M-pulse 600
  173. Orange RockerVerb 50 MkII - No Bias Voltage
  174. Problem with Fender M80 Chorus
  175. Reverb Hum in Gibson GA-19 RVT Falcon
  176. Blonde Bassman
  177. Output transformers and power tubes
  178. Mark Huss plexi with 6v6
  179. Marshall YJM100 schematic?
  180. TDA2030A -anyone experienced w this chip? Plus possible related issue
  181. Working on Bugera 6260 amp - Question about Tube Grade...
  182. Randall RH150 volume cutting
  183. JBL EON dissassembly?
  184. Trem help
  185. Bugera 333XL switching problem
  186. Fender Super 210 getting the best of me
  187. Need a new scope. USB scope used with a laptop ??
  188. Rath Amp Retro 50
  189. Alamo Futura
  190. Marshall Lead 12 5005
  191. Hot Rod Deluxe volume loss
  192. Orange OR80 fuse position
  193. Fender Deluxe VM blowing fuses immediately after taking off standby
  194. Grainger Valve Edition 5 Issues
  195. Line 6 Spider 112 50 Watts Problem
  196. Noob wants to work on Crate GX-30M input jack
  197. Variac carbon brush replacement
  198. Problem with high mAs...
  199. power transformer for Hiwatt Buldog Bass 20 cheapie amp
  200. Source for replacement 1M dual gang pot for JCM800
  201. Issues with a Acoustic B200H 200w Bass Head
  202. Spectra 225 PWR AMP 550-032 REV C
  203. Old Ampeg V2
  204. Capacitor aging question - Ceramics and Electrolytics
  205. Peavey Heritage Voice Coil rubbing sound
  206. Help/advice with new build poping at hi vol
  207. Mesa Express 2 25 low power?
  208. Goofy Voltages on New Tweed Harvard
  209. AC30TB 1989 Trem Troubleshoot
  210. deoxit? NO!
  211. Quiet Fans?
  212. Macro-tech 5000vz
  213. Amp Fuse
  214. Peavey Bandit-75 possible problem with distortion channel
  215. Marshall MA50 head no sound
  216. Oscope ?
  217. Crate GX-212 power amp puzzle
  218. Discharging Caps
  219. Ampeg V4 B H Imstumped
  220. Mesa Boogie MARK III
  221. DC on input jacks?
  222. Filament PT for Peavey 5150 needed
  223. Fender Red Knob Twin increases hum connecting preamp out and/or poweramp in
  224. blues deville sounds blah and thin
  225. 2004 Fender HRDlx Volume Loss
  226. Premier 120 screech
  227. 1st gen Krankenstein high pitched squeal
  228. Fender '65 RI Deluxe Reverb making noise
  229. Kustom 250 Tremolo Issues
  230. HRDlx Footswitch switches
  231. Fender Bassman 150
  232. Ampeg BA155 HPT How to open speaker enclosure
  233. RoHS and tubes
  234. Most common parts...
  235. Marshall AS100D Acoustic Amp reading -vdc on the speaker output(s)
  236. Stage 112se amp issues - revisited?
  237. SVT-2 Pro: Hum when Input UNplugged; SNARL coming out of STBY
  238. Peavey VTM 60...Lost Heaters?
  239. Hot Rod Deville III V1 reverb noise
  240. sunn 200s amp help
  241. Fender Deluxe 85 may be blown?
  242. ECC83 in inverter
  243. Fender Pro Reverb AA165
  244. plate voltage creeping up on a 1979 marshall 2203...
  245. Testing capacitor failure
  246. Fender Concert Power trans replacement
  247. Locked thread.
  248. Peavey Classic 50 - cracking and sizzling
  249. Help identify new hum on 2 1/2 year old 5e3 build
  250. Low signal at power tube input grids (Marshall TSL JCM200)