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View Full Version : Maintenance, Troubleshooting & Repair



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  1. What the heck is B+, and that A on AA764 Champ Schematic?
  2. Marshall JCM2000 DSL 100 biasing?
  3. What output transformer for Mesa Boogie Studio .22 +
  4. Tubes too hot for OT?
  5. Hartke 7000 output bad with load
  6. fender princeton amp. ?????????
  7. Hartke 3500 no output...photo enclosed
  8. Where's the reverb
  9. Power Caps bleed how fast? Does that indicate condition?
  10. Fender Deluxe Reverb re-issue
  11. Sovtek Mig 50
  12. wanted : transfo for Ampeg B2R
  13. "Thumping" tremolo circuit
  14. Roland Jazz Chorus repair NYC
  15. 5y3 GT in 6G2 Princeton
  16. SF 1969 Champ, what is causing "chirping" ?
  17. Marshall Vintage Modern 2466 Schematic?
  18. Please please help svt classic problem
  19. Roland Jazz Chorus
  20. Very old pignose 7-100
  21. Peavey Delta Blues
  22. Marshall JCM2000 TSL feedback on clean channel
  23. Traynor 7027 sub?
  24. Fender 30 - channel switch pops
  25. Ampeg V4-b, bad 6k11 stage...
  26. Tubeworks schem?
  27. VOM MOdel 700
  28. Yamaha Bass Combo YBA-100
  29. supro loss of volume
  30. Removing the chassis...
  31. Vox Berkeley ll Low output
  32. Biasing amps with PCB mounted power tube sockets....
  33. Marshall JMP1 with flaky power button
  34. What kind of speakers are these?
  35. fender princeton chorus amp
  36. boxy sounding cabinet
  37. Hot Rod Deluxe problem
  38. Pro Reverb Volume drop off, desperately need help
  39. Can any help a brutha out with a vox ad 120 vtx speaker issue?
  40. Marshall G100R Schematic?
  41. 70's Deluxe Reverb reverb squeal
  42. Vox 1143 question
  43. Deville Hot Rod 212 fizzled out
  44. Ampeg Svt-200t schematic
  45. Vibroverb PT - no centre tap on heater circuit
  46. Gibson GA42 subtle overdrive problem
  47. Power Transformer - Crackle and Hot!
  48. 6505+ just quit
  49. Voice of Music Model 700 (1955)
  50. Ampeg SVT-4 PRO repair amp output
  51. Carvin Series III X-Amp
  52. How can I test a ouput trans to see if its faulty
  53. Amp squeals at hi gain
  54. New member, new '77 Princeton Reverb
  55. Vox AC 30 HH China RI schematic
  56. 13ohm speaker load: 16 or 8ohm tap?
  57. Zero Ohms on reverb tank input?
  58. Sovtek mig 50 - Transformer change.
  59. White noise...
  60. Hohner Harp Mic - pots
  61. Trac Elliot Speed Twin Output Tranny Specs and Replacement ?
  62. Tape on reverb tank coils - why?
  63. Gibson Explorer
  64. Proper orientation of coupling caps
  65. Preamp Woes 8080 H(Valvestate 80V)
  66. Troubleshooting hiss
  67. Marshall DSL JCM2000
  68. Finding Gassy Tubes.
  69. Marshall 8040 - How do I get at the pots?
  70. Twin Reverb II data and schematic
  71. "Phaser kind sweep" with Master Volume???
  72. Univox 2x12 tall tube amp-japanese
  73. Mace reverb hum
  74. Jcm900 Issue
  75. Deluxe Reverb Rebuild need expert help
  76. marshall tsl 602 - dull sound
  77. Peavey rockmaster help
  78. Hiwatt dr504 bias problem
  79. potentiometer question...
  80. Fender Amp Power On/Off Light Problem
  81. Gretsch playboy amp vibrato problem
  82. Marshall MG100HDFX repair?
  83. my mg100dfx problem
  84. Testing OT's
  85. Engl Fireball Trouble
  86. Fender PCB pots
  87. Solder/Desolder Station
  88. Marshall JCM 2000 reverb query
  89. Power tranny gets HOT in old Guild amp
  90. Ampeg SS-70CA schematics?
  91. Bias Circuit Problem
  92. Peavey Valveking switching help!
  93. Crate VC120H schematic needed.
  94. New Guy, 5150 question.
  95. JTM45 build - channel volume problem
  96. Hartke 3500 MOSFET Output Transistors
  97. power tran buzzing
  98. Peavey Classic 30, no sound until turned off.
  99. 1950's Ampeg Amplifier
  100. DSL Hum, C46 question
  101. Rivera Clubster 45 hissy
  102. mesa oscillation
  103. Quick Questions Acoustic 370 head
  104. Troubleshooting noise issue
  105. JMP-1 Faulty
  106. Epiphone Valve Standard- Please Help?
  107. troubleshooting ?- Hum
  108. SVT-VR bias issue
  109. Crate G20 XL SCG Circuit Problem
  110. HRD plate load resistors, anything else?
  111. Marshall MG50DFX level problem
  112. Terrible fizzing
  113. Peavey Mace Question
  114. Is this circuit ok or has it been hacked? Please advise (vintage tube amp)
  115. Princeton Chorus Breaks up on clean channel, chorus gets stuck...
  116. peavey century 200 bass series
  117. Underfiltering??
  118. Masco MAP-120N
  119. Mesa Boogie Mk3 Schematics, layout etc
  120. Blues Deluxe low volume no clean
  121. TL072 or 4558 in a Blues Jr Reverb
  122. Hot Rod Deluxe 6L6WGC too hot?
  123. Ampeg Gemini II wiring help needed
  124. 5E3 tweed deluxe home build just died
  125. Legend A 30 amp
  126. VoxAC30 CC phase inverter problem?
  127. JCM2000 DSL wiiieeerrdd problem
  128. classic 50
  129. solid state problems
  130. XR700 Power Mixer clips, low volume
  131. Acoustic 122 schematic
  132. Laney LC50/2 PCB removal?
  133. bridge rectifier problems
  134. Trace Elliot TA100R schematic
  135. Heater voltage too high!
  136. laney vc30 wooshing noise
  137. Dead Blues Deville
  138. no Name tube amp acting strange
  139. Matchless DC30: noise, pops and scratchy volume pot
  140. Marshall AVT150HX Schematic
  141. Selenium rectifiers
  142. isolation transformer - high voltage.
  143. Marshall Valvestate 100 Problem Please Help :)
  144. Marshall V8080 pot list
  145. Ampeg VL-503 schematic
  146. Cap wiring help please.
  147. Filter Cap Values?
  148. Ampeg B-100 (solid state)
  149. Hot Rod Deluxe is too hot (accoustically)
  150. Gibson GA79RVT Reverb motorboating
  151. fender stage 112 "pop,crackle"
  152. Vox AC-30/6 TB problem
  153. About biasing tube guitar amplifiers
  154. problem with an ENGL Sovereign amp
  155. Mesa Mark IV problem
  156. Rumble 100 schematic
  157. Multicap sources?
  158. AC15 questions
  159. Brown Deluxe plate voltage
  160. Peavey 6505 Plus on tour
  161. Fender red knob twin pops when using push pull pots...
  162. EH BassBalls problem
  163. AC30/6 TB constant feedback
  164. Testing Caps
  165. 1 6L6 (of 6) at 2x bias Super Twin Reverb
  166. SVT CL cuts out. Speaker Cab or Amp??
  167. Reverb pan for a R12R Reverberocket???
  168. Princeton Reverb and unwanted Distortion
  169. Crappy input jacks on 65 Deluxe only lasted 43 years.
  170. Sunn Beta Lead Popping 6 amp fuses
  171. Major thanks to Enzo - Vox driver transformer reingineered
  172. Piezo Tweeter - Rumble 100
  173. LM3886 chip - why no work?
  174. Peavey XR-700
  175. Acoustic 370 troubleshooting help
  176. Ampeg VT-40 woes
  177. Fried Marshall MG100HDFX! PLEASE HELP!!!
  178. Ampeg V2 Head that needs something....
  179. 'evil' twin with no sound or pilot light
  180. Peavey Classic 30 switch to Celestion V30, G12H?, Hellatone? AGH!
  181. Peavey Classic 50/410
  182. need help - Old cap can ID
  183. Seymour duncan 84-40 intermittent voltage drop
  184. Stray capacitance???
  185. Same old same old...popping cathode bypass switch.
  186. Peavey Classic 20 distortion when warm
  187. PSU -ve rail voltage drops under load
  188. Question about speaker polarity
  189. Marshall JTM60 malfunction
  190. Gibson Lancer...help?
  191. SJ68568 to-3 output x-istor
  192. Filament balance pot
  193. JCM900 running real hot!
  194. Valve Fuse keeps blowing on my sovtek - need help
  195. Fender 125W Princeton Chorus w/Loud Buzz
  196. Red plating Vox AC
  197. Desperately seeking schem and photo of Guild 99J amp
  198. Need help with Fender Stage 100
  199. popping sound
  200. SS Ampeg B100 schematic?
  201. HIWATT vs. SUNN
  202. Eurodesk MX3282A schematic
  203. Danelectro DS100 schematic?
  204. Vox 4120 or 7120 schematics
  205. too much crosstalk??
  206. Carvin bridge rectifier
  207. "Broken" Musicmaster Bass amp question...
  208. Organ Amp
  209. twin reverb doesnt turn on
  210. Marshall 275 AVT Problem
  211. Ever do this?
  212. 70's silverface Twin Reverb squealing
  213. Pilot light bulb equivalents?
  214. Fender M80 : distortion
  215. 6G16 Vibroverb vibrato problem - red plating tubes!
  216. Hiwatt Lead 50R no quiscient current
  217. Bad L-Pad SWR?
  218. Issues with my Fender Stage 160
  219. Lost my Impedance Selector Switch
  220. Hiwatt Lead 50R cannot remove chassis!
  221. Transformer Troubleshooting
  222. Marshall Valvestate 8040 sound dies
  223. 5150 combo - New GT-6L6C Power Tubes
  224. Schematic For Marshall MG 250?
  225. 5150 combo standby led stays off
  226. Old Fender Twin Buzz in Reverb
  227. How do you install Transistors
  228. fender red knob "the twin"
  229. Problems With Ampeg Svt2 Pro
  230. Fender Stage 160 problems
  231. Reverb on a 1982 Musicman 112RD50 not working
  232. Marshall Silver Jubilee switching issues
  233. SWR Studio 220 - dead
  234. Ampwares
  235. Fender stage 100 DSP Head need help
  236. using coax cable or input
  237. Cap Job
  238. Boogie MarkIIB going sour
  239. Vibrosonic Reverb Vibrato Problem
  240. PING: Enzo
  241. Vox AD15VT, Pwr amp works but now sound from input
  242. Crate XT120R "high" pot problem
  243. Maestro Phase shifter - Splat sounds
  244. Strange power section problem
  245. Hiss in BF Bassman build
  246. Traynor YGM3 distorted reverb
  247. Peavey Classic VT 212
  248. Bass amp crackling noise
  249. Peavey XR 600B no power to front panel
  250. Blackface Fender Twin rattle