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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Very noisy master volume pot
  2. celestion C15H-200 Bass Speaker
  3. JCM gain control cutting volume
  4. Four Terminal Pot?
  5. Simple problem with my Trace-Elliot 7210H Bass Head
  6. Blowing fuses
  7. Fender Princeton Reverb (Hum) No Sound
  8. Finished most of my cap job
  9. Peavey 5150 Combo Problem
  10. rectifier tube analysis
  11. Peavey 6505+ Lead channel....tone controls not working?
  12. Lost power in Vibrato Channel Bandmaster
  13. Ampeg BA-115 bias too high
  14. Help! Mesa Nomad 45 Reverb Failure
  15. Crate VC50 3x10
  16. Budda VerbMaster??
  17. Roland Space echo: Touchy Reverb
  18. Hartke HA3500 valve preamp no output
  19. marshall JCM 800 Bass series strange problem
  20. Figures, another 5150II blowing fuses...
  21. Question about Pro Reverb OT impedance
  22. GSP5 Digitech
  23. 220uf 100V Filter Cap?
  24. Homebrew HELP!
  25. Fender Stage160 Reverb not working
  26. 60 hz hum problem
  27. Need schematic Ampeg Sj12-R Superjet II
  28. Super reverb behaving crazzzy
  29. Clipping in tremolo circuit
  30. my amp is working like a transducer!!?
  31. Peavey Ultra 120 Plus Head PRoblemo
  32. Blown Fuses
  33. Mesa Boogie Nomad 55 Combo
  34. My 65 Champ losing it's voice
  35. Crate GX2200H - Blowing Fuses
  36. Ampeg V4 bias problems
  37. Fender power transformer european model
  38. Treble distortion
  39. Boogie DC-3 headscratcher.
  40. Need Ampeg Vt-40 And G-15vi Scematic
  41. Sunn 120 Watt valve head, no sound. What to do?
  42. EQ inductor for old Fender
  43. Need schematic for SWR LA 15 combo amp.
  44. Questions re ~1976 Twin Reverb/trashy distortion
  45. Crate BV-60H power but no sound
  46. ESR question Fender reissue Bassman
  47. GK 1001RB no output
  48. This Is Wierd....
  49. Anyone have Trace elliot schematic for GP7SM 200?
  50. Marshall AVT150 OD1 & OD2 are half the volume of the clean and AC Sim Channels
  51. Marshall Jtm 60 615 Trouble
  52. Fender Ultimate Chorus - bad hum
  53. Compu-Bias Meters
  54. Preamp squeaks - basic understanding
  55. Marshall TSL60 - Excessive hum
  56. Marshall Jcm 900 4100 Repair In Chicago
  57. Crate BX-220H problem
  58. Mesa Mark IV Noise
  59. multicapacitor disassembly
  60. Need Schematic for Crate BV6212
  61. Reverb Circuit Question
  62. Minimum Heater Voltages
  63. Tube Amp reverb noise, no vibrato intensity, unknown model.
  64. Valvestate 8080 bass bug
  65. No power to my crate monitor amp
  66. Im proud to say...
  67. problem with the performer 650
  68. Need schematic for Randall RG 50
  69. Is this PT too big?
  70. Line 6 duoverb head problems
  71. lenny
  72. Fender 212 Reverb Not Working
  73. DR Bias and Bypass Caps?
  74. EF86 Users Check this out
  75. old Kustom preamp bias problem
  76. Adjusting 6L6 power amp for 6V6
  77. Mr bassman 100
  78. Reverb tube redplating
  79. ampeg svt2pro
  80. Bad Cat Hot Cat 100/Redplating/eating o/p tubes
  81. Reverb - what is wrong?
  82. solidstate Marshall, bad hum on second channel
  83. Basic Question - Footswitch for Blues Deluxe
  84. Ampeg V4 shorted diodes- primary OT
  85. ChassisBolt holes on a Princeton reverb
  86. Peavey Delta Blues/ Classic 30 Reverb Problem
  87. Beacon output transformer with 9 secondary taps, what ones to use?
  88. Crate BV150HB
  89. help with Fender Performer 650
  90. Overdriving 6L6's
  91. Fender Twin changes volume
  92. Ampeg Jet J-12 Tremolo Problem
  93. just got a new hiwatt and I need help!!!
  94. Do Vibrato circuits suck down output?
  95. Vox AC10 RFI Pickup
  96. Mig100b schem/xformer info
  97. Acoustic 320, low output, what to do?
  98. getting a signal after turning amp off??
  99. OK I screwed up my DRRI
  100. Trouble with Marshall AVT50 Head
  101. Marshall Jcm 2000 DSL
  102. help with a VOX ac30
  103. Ampeg vl-502 tube socket short?/fire
  104. Bassman 70 Hum
  105. Bad PT?
  106. Blues Deluxe - no sound
  107. No Power on Frontman 15R
  108. Help!
  109. BFDR popping sound when STBY switched off and a few small issues...
  110. Fender Bassman 70
  111. Marshall MG 30DFX - faint crackle when turning the effect dial
  112. Peavey 6505+ blown fuse F1
  113. Recapping a Fender DRRI
  114. Help with SoCal 50 Reverb tank
  115. a/c jack for Marshall
  116. low gain and weak output
  117. RE: MG80R-CD schematics?
  118. HD Deluxe & deville + and - supplies
  119. Peavey classic 30 reverb and general sound...
  120. Marshall 8080.... hot resistors
  121. 1962 Ampeg Reverberocket Restoration
  122. Peavey Artist 120 not working
  123. SE el84 triode wired=hum as pentode=no hum ?
  124. Loftech TS-1 power transformer needed
  125. Fender Stage 100 Amp troubleshooting
  126. Input jacks in PCB amp: shorting or not?
  127. Echoplex EP-2 won't record!
  128. DSL100 intermittent total volume fade
  129. Gk 200mb
  130. Workingman's 15 or 12?? Blows Fuse
  131. Reverb won't work on my Twin
  132. Ampeg SVT lll input
  133. Diodes for marshall vs150h TSB
  134. Marshall Valvestate VS100 no sound!
  135. fender twin reissue dead no power
  136. suddenly no sound from my Crate GX-15?
  137. Ampeg SVT-II Bias Procedure
  138. Fender Dual Showman Reverb: Verb and Vib problems
  139. Marshall w/ melted caps next to tube sockets
  140. Rectifier tube arcing.... fuse blows
  141. Can't find 150UFd 300V Ecap
  142. JMP Low Output
  143. Ampeg B-15 voltages off
  144. Roland Space Echo RE 201 Scematics
  145. DSL 401 no sound/weber mini mass
  146. DSL 100 noise
  147. silly grounding question
  148. Volume Fluctuation in Marshall JCM 2555
  149. is this a bad PT??
  150. Marshall Valvestate 8020 - Hums and Crackles
  151. my volume knob is haunted
  152. Marshall MG100DFX problem...?
  153. -340Vdc bias from secondary taps (LONG)
  154. amp making a crackiling at high volume
  155. Problem w/Vox Valvetronix AD15VT
  156. ampeg v-5 not loud at all
  157. Gibson Super Goldtone 30RV blowing fuses...
  158. Adjustable Bias on Rivera Chubster/Clubster
  159. Looking for amp rebuild advice please
  160. Hissing problems Sovtek mig 50
  161. Marshall TSL100 Head Problem
  162. can you overly capacitate power supply?
  163. Deluxe Reverb RI Bias Puzzle
  164. 6AQ5 substitutions
  165. baddog
  166. Which Driver
  167. peavey classic 60 trouble
  168. Marshall JTM30 mystery
  169. TNT-100 Repair Problem 2
  170. "Dual Professional" Fender 2 Button LED Footswitch - Why not?
  171. dimbulb tester is glowing bright
  172. Need help with a speaker problem.
  173. randall 1992 12" guitar amp noise cutting off
  174. Ashdown Peacemaker 60 Head
  175. never mind
  176. Ampeg Reverbrocket blowing fuse
  177. Help with Peavey XR600B
  178. line6 pro duo hummmmming.
  179. low gain on ef86 gain stage problem
  180. 1973 Fender Princeton Reverb Vibrato Noise
  181. Dropping B+ before filter caps
  182. marrshall valvestate 8200 bi chours
  183. Marshall 1959HW has low volume
  184. Does Marshal PED081 work with Roland JC-120
  185. Marshall JCM900 4100
  186. question on a Framus Dragon Amp 100watt
  187. Fender Super 6 Reverb squeal
  188. Marshall 2959?
  189. .33 Ohm emitter resistor instead of a .22 OK?
  190. SWR combo
  191. Please help!!!
  192. What do you do when a customer brings you an amp with an intermittant problem...
  193. jcm 800 wierdness
  194. Valvestate 8080 Troubles
  195. Humming Vox AC30 reissue that dies down when 'normal' vol is at 1'o clock
  196. trouble sourcing restistor
  197. Marshall Valvestate VST50 Transformer
  198. Fender Stage 160 amp problem
  199. Marshall JCM 900 making a crackling noise
  200. trying to understand power transformers
  201. Biasing Peavey JSX
  202. Hummmm help
  203. Oops!Shorted something!
  204. Pace MBT-100 heater
  205. How to take apart a Micro Cube?
  206. Behringer k3000fx amp
  207. solid state amps howling
  208. Carl Zwengel, where are you?
  209. Gibson Falcon output transformer
  210. Fender M-80 Chorus Troubleshooting
  211. Output transformer for a Magnatone 108
  212. mesa boogie 20/20 schem
  213. Thanking you kindly
  214. PV CS1000X schematic and layout
  215. A few questions about a Fender Twin II
  216. Fender Champ 5C1
  217. Hartke HA4000
  218. Peavey PV2600 Power Amp
  219. Marshall 2205 JMC800 Reverb does not work
  220. Help Fix Marshall Valvestate 10 Volume
  221. Tube amp Question
  222. Replacing Molded Paper Capacitors
  223. SUNN Concert Bass
  224. fender blues junior help
  225. Peavey Ultra Plus - pull tubes?...
  226. Output Transformer recommendations
  227. Fender Transformer info
  228. DC Indicator lamp?
  229. Ampeg SR-212rt Issues
  230. Fender Hot Rod DeVille 410 sharp noises with high volume levels
  231. Fixed Bias?
  232. Hammond OTs as replacement
  233. eico 666 tube tester
  234. Sunn Beta Lead Restoration
  235. Ampeg Jet LDR Replacement
  236. Questions about old Univox amp
  237. Dead in the water Princeton Reverb Amp
  238. XR600B IC4741cp
  239. GK 200M trouble...trouble.
  240. Help with Spectrum ll
  241. Marshall 1987x issues....
  242. Peavey Unity series 1002 mixer take apart..
  243. newbie stereo/mono question
  244. Ampeg G2-12 Test points & troubleshooting help
  245. red knob the twin clean channel....
  246. Twin Amp current
  247. carvin r600 mosfets
  248. Question About Proper Use of Variac
  249. Transformer recommendations
  250. Bias question