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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Twin Reverb Issue
  2. Proper way to test a Power Transformer after an amp meltdown?
  3. Peavey CS-800x power board circuit short
  4. DOD 831 II Graphic Eq. Will someone help to troubleshoot this dead unit ?
  5. AC power test setups and tools; GFI as a tester
  6. SVT CL brief buzz coming out of standby
  7. hot rod deluxe PT voltage?
  8. Hartke LH500 Protection Circuit
  9. Pickup issue
  10. SVT 3 PRO - hum
  11. Peavey Valveking VK212 100W Combo: No Tube Power
  12. Fender DRRI reverb problem suspect footswitch please help going crazy!
  13. Sope question
  14. Ensoniq SQ-80 losing polyphony voices
  15. loud intermittent humming problem
  16. Carvin X100 speaker fuse
  17. Traynor YGM-3 Reverb Fail
  18. Fender Super 60
  19. DFX Professional 215X
  20. Cooling fan re-connection
  21. Amcrom Power Stage 2 O/P problem
  22. HELP!...peavey bass head mark III series buzz problem...HELP!
  23. Popping tremolo - dead amp
  24. Laney hair puller
  25. Reverb oscillation fixed
  26. Fender Super Bassman Automatic Bias issues
  27. Varisistor ratings in a Fluke 8010A bench meter
  28. ampeg sb12 very high voltages
  29. Ampeg B200r trouble
  30. Marshall AS50R with a loud popping sound on switch on
  31. Is this one possible failure mode for filter caps?
  32. Bad red plating problem!
  33. Tracking a Princeton Reverb build hum!!!
  34. Anoten twin reverb 65 ri with reverb hum
  35. Crate GLX212 preamp screeching sound
  36. Power Amp module for Marshall MG100hdfx wired wrong
  37. Pot cleaning
  38. Mosfet Question (Trace Elliot)
  39. Yamaha P7000 Service Manual in English?
  40. Blues Deluxe Low B+ voltage crackling distorting
  41. Fuse Blowing Issues
  42. Tube Sockets
  43. 1984 Legend A30 Series II Power Transformer Question...
  44. Gibson GA77 RET-L Lancer, help with zenor diode replacement
  45. Burns Orbit Three - Ticking
  46. Source for Reverb Tank Transducers?
  47. Trace Elliot Velocette questions
  48. SVT-CL: Another one for the guru :-)
  49. High B+ voltage in '60s Ampeg Gemini
  50. Fender '68 Custom Twin Reverb Hum
  51. Solid State Acoustic Guitar Amp - Hum Problem
  52. TSL100 noisy when VPR switch pushed in
  53. Bogner Shiva Power Tube Pins 1&8 Not grounded?
  54. Soldano Lucky 13 (Leaking o/p board?)
  55. Help Fixing my Sessionette 75 AMP Power Module
  56. Peavey VTX Heritage phaser
  57. Any tips on reflowing solder on PCB?
  58. Peavey Envoy 110 Transtube (red stripe) question - crackling on sustained notes
  59. audio testing of amplifiers...espically home audio and PA...
  60. High voltage replacement caps
  61. Behringer PMP1000
  62. Ampeg V9 SVT filament transformer hum and vibration
  63. Yorkville NX750P
  64. Fender Twin Reverb 65 RI keeps blowing 8 amp filament fuse
  65. Marshall JCM2000 TSL100 Footswitch problems
  66. My fender stage 185 amp won't power up
  67. Ampeg SVT-3 Pro Repair help, R27 catches fire on power up
  68. Marshall JCM 800 (2203) Microphonic O/P Valve problem.
  69. Hot Rod Deluxe, 1996, at my wits end - hum problem won't go away!
  70. Kustom Challenger
  71. Finding Plate Voltage
  72. Reverb Tanks: An Orientation Experiment
  73. Ugly distortion with tube amp when you play
  74. Sound City 120R: need some advice
  75. Another Antique Peavey
  76. Ampeg SVT-CL/AV Tech Flex replacing Clear Vinyl 'garden hose' harness sleeving
  77. Preamp DC Heater Help
  78. Peavey Bravo Plate voltage
  79. Carlsbro TC200 recap
  80. Ashdown MAG 600 Blows Fuses
  81. Otange AD140 real output power?
  82. Gibson G50 hums...
  83. V4 ONLY works on my bench
  84. Hammond output transformer help
  85. Mesa Mark V sneaky or annoying?
  86. Ampeg STV 4 Pro MOSFET replacement and other Qs
  87. New amp with high voltage on the transformer
  88. SVT-CL: Protection at Turn-On
  89. Carvin Pro Bass II
  90. Power transformer secondary
  91. jcm 900 mkIII combo safer connection with mesa boogie 4x12 cabs
  92. Fender Ultimate Chorus issues
  93. 5mm SQ Red/Yel LED's for Fender HR DieVille Amps, Pedals
  94. Crackling, splattering in amp...
  95. MusicMan 1650RD troubles
  96. Marshall JCM900 SL-X 50Watt high gain master volume 2500 Muffled sound
  97. Hot Power Transformer, Budda SD30-II
  98. Fender Twin Reverb....silver face
  99. Parts for a Peavey 212 SF?
  100. Fender Super Sonic 22 Vol and Bass drop on Burn ch.
  101. Deluxe Reverb - weird vibrato oscillator voltages + choppy trem
  102. Problem with Univox U130L
  103. OK comrades...MIG 100B and MIG 100H Differences?
  104. Egnater Tweaker 40-Really bad ground pops on many swithces.
  105. Ampeg SVT Classic Bias Light issue
  106. Crate GTX3500H Tidal Wave - Channel 3 Inoperative
  107. Kustom K200A.4
  108. Eden Nemesis RS210 - 60vdc at speaker output
  109. Vox AD100VT = Fart Machine!
  110. Gibson GA19 RVT tremolo issue
  111. Fender Bassman AA165
  112. 65' twin reverb reissue hum with reverb
  113. Crate V1512 Cracklin, popin, humin...loudly
  114. Pop, fizz, stink, and a new hum on a homegrown tweed tremolux. Looking for ideas.
  115. Roland AC-33 low output
  116. Peavey Classic Chorus 212 channel switching problem
  117. Odd Jubilee switch/pot
  118. HK Tube-sheister 36
  119. SMD code PJ88 Diode SMB8 package
  120. Need a new source for 25uf/25v axial caps.
  121. Peavey replacement basket compatibility
  122. Marshall JCM 800 4211 Combo Blowing HT Fuses
  123. Hot Rod DeLuxe I switching problem
  124. 65 Epiphone Zephyr amp would be the same as Gibson what??? Reverb problems, help
  125. Marshall JCM800 2203 with oscillation on output
  126. JMI VOXAC30 TOP BOOST low headroom.
  127. SPMS repair, IR21531, please help.
  128. Mesa Boogie Nomad 55 strange noise. Please help.
  129. MB Dual Rect Tremoverb
  130. PV 1500 Thermal issue
  131. Gallien Krueger Fusion 550
  132. Marshall JCM800 2205 Problems
  133. Martin Pro Stage lighting
  134. Conductive Eyelet Board
  135. Gibson GA77 RET needs new Power Transformer
  136. Ampeg J-12T RI red plating
  137. Knobs won't come off Bassman 100 combo
  138. Bose PS1 wtf?
  139. Fender Frontman 212R distortion problem
  140. Marshall MF50DFX
  141. SWR Strudio 220 5kHz Oacillation Problems
  142. Spam
  143. PT go BZZZZ
  144. Vox AD60VT - I volunteered to help friend fix amp and am now stuck with just hum
  145. Fender FM212r no channel switching
  146. Fender HR Deville Had a Drink.
  147. JMF Spectra 112 power transformer
  148. jcm800 mk2 lead pitch noise in V1
  149. Eden WTB700 distortion control faulty
  150. 70's Ampeg V4: early breakup
  151. Belton reverb tank went microphonic (relatively short lived)--this the new normal?
  152. Help need board for my ibanez roadstar base
  153. diode and cap quest
  154. CRATE FXT 120 No Sound Output??
  155. Mono Preamp, Stereo Power Amp: Not Enough Gain!
  156. Ampeg Gemini 2 recapping problems
  157. Sunn 1200S PA distorting
  158. Musicman RP-65 (2165-RP) distorted sound, even at low volumes
  159. Behringer Europower PMP4000
  160. Question on preamp section - Elka tube amp
  161. Musicman 2475 - 150 questions
  162. NJM2147D Substitute?
  163. De-buzzing MusicMan HD130 - any suggestions?
  164. Randall RD50 Bias
  165. Crate TD50B replacement input jack - parts numbers/suppliers?
  166. SVT CL 1997 slm pre out power in issues
  167. Low volume, possible cathodyne issue, help needed.
  168. peavey 112 transtube overheating problem
  169. BOSS TR-2 Tremolo with audible oscillator ticking in bypass mode
  170. Peavey Combo 115
  171. Info on spectrum analyzer, signal analyzer, etc (HP 3561A)
  172. Blues Deluxe RI - relay question
  173. Replacement Input Jack for Eden Nemesis N12
  174. Polytone mystery
  175. Resistor power rating query.
  176. Vox AC4TV output transformer replacement
  177. Hartke LH1000 balance ??
  178. Low volume in preamp stage
  179. Marshall 2205/2210 pots argh!
  180. SWR Workingman's 15 blow fuse
  181. Silverface 135 UL 'output balance pot'
  182. Vintage Ampeg B-100 Bassamp fuse, where is it?
  183. blown fuses Kustom KBA16
  184. Fender Pro Reverb - Hum
  185. Fender Acoustasonic Jr. DSP Effects troubleshooting help
  186. Ampeg BA210 - Lacking volume past 4 on the dial
  187. Swart AST resistor
  188. blackstar series one 45 - schematics
  189. SWR super redhead speaker fire
  190. Vox VT 40 +
  191. Kalamazoo bass 30
  192. Function Generator
  193. Peavey VTM 60 Molex connectors
  194. Want to make my own Biasing test probe for EL84
  195. yamaha EM-150 opamp
  196. OT transformer mismatching
  197. Hot Rod Deville III - clean channel problems
  198. long life axial
  199. Eden Metro amp - power supply problems
  200. Peavey VTM 60 filter caps
  201. Lost the distortion on an Orange Crush 15R.
  202. Bugera 333XL effects loop switching on/off by itself.
  203. Peavey classic VT phase inverter voltages
  204. Peavey 3120 Channel Switching and low volume issue
  205. Thoughts on dropping B+ in Ampeg V4 (another blasted V4!)
  206. Brunetti Star T Rack overdrive characteristic
  207. Peavey PK100
  208. Old Ampeg reverberocket tremolo problem
  209. Question about phase shift oscilator/tremolo
  210. Roland KC350
  211. Volume drop after redplating tubes.
  212. Newly built clone ampeg B15 with 100watt output
  213. Fender 75 Head (1980's) Is this an OK thing? (See Pic) Permenant Cap Drain?
  214. KTD2059Y (D2059) substitute
  215. Help with vintage Gibson GA-40 motor boating on ch1
  216. 5150 filament string
  217. kalamazoo model one tremelo sound when cranked.
  218. Crate V5 - very low volume
  219. What is pulling voltages down in this amp?
  220. Problem with vibrato in Silverface Twin Reverb
  221. Fender Rhodes spares..
  222. Gibson GA5-T crestline B+ low and bias questions
  223. Bad valves?
  224. Gallien Krueger MB150 unpredictably unstable
  225. Ampeg SVT bias:protection circuit
  226. A generalized chassis support for the workbench
  227. how do I get inside an Ashdown After Eight bass amp
  228. Marshall JTM45 reissue very poor tremolo
  229. Epiphone Constellation V Amp - Need Power Switch
  230. Peavey Mark III 1978 Sereis 400GH
  231. AT100 blowing random power resistors
  232. B100R pop on shutoff
  233. Fender Super Champ X2 Channel 2 and FX not working after op amp switch
  234. 1959 Vibrolux 5F11 Fender Fuse rating and 3-prong ground questions
  235. 2203 Oscillation (and solution).
  236. JCM 2000 DSL no output
  237. Marshall JMP making squealing noise
  238. Output Transformer Question: Marshall JCM900 50W
  239. has anyone worked on a roland ac 60?
  240. Marshall amp pot replacement
  241. Problem with noise using a 65amps Ventura
  242. Peavey Backstage 30 - Loud Constant Hum
  243. Testing Caps (out of circuit): What do you use and why?
  244. parallel silver mica caps opinions please
  245. Peavy CS-400 Blowing resistors
  246. Egnater Rebel 20 Plate V and other issues
  247. prosonic noise v3
  248. Roland JC160 no chorus
  249. very particular Fender amp repair / restoration in Los Angeles (Burbank / NoHo)
  250. Marshall 3210 Mosfet head. Can't turn off the boost channel.