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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Peavey 212 special lead section no light no sound
  2. Looking too build a 100watt bass amp what one Fender Peavey ?
  3. Marshall DSL 40C - clean channel dropping volume once amp is heated
  4. Hiwatt experts please chime in...Mark Huss ?
  5. Marshall 2555 Silver Jubilee build
  6. Fender Champ XD No Output
  7. LANEY VC30 annoying noise
  8. Marshall VS100 combo noise
  9. 1989 Marshall JCM 800 2204 low volume problem
  10. Roland Blues Cube BC-60 - v low output
  11. Here's a twist
  12. True Confessional
  13. Bassman 300 boat anchor
  14. bf vibrochamp circuit with low low output
  15. Ampeg B-100R pilot light
  16. Low voltages under load from PSU equal bad PT?
  17. VHT Lead 40 Blowing Internal Fuses
  18. Randall RG 235 DS schematics ??
  19. Bogen J330 Mic Input Problem
  20. Scratchy POST VOLUME pot Peavey Combo 115
  21. 1954 Bogen VP17X Bass Control
  22. Another day, another dead acoustic pickup
  23. Harmony H306a low output volume
  24. Eden WT-800 Bridged Mono oscillation
  25. Sunn Model T reissue squealing
  26. Marshall JCM900 - 5881 version is too bright
  27. Marshall JCM800 Lead (2205) VERY HI HUM---HELP!
  28. FMC authorized repair
  29. Measuring output power
  30. Sinmarc power transfomer R2280 replacement needed
  31. Polytone problem...
  32. Shure Pro Master 700 Mixer - Need Advise Please
  33. Gibson GA5t Crestline voltage question
  34. Mis-branded Fender parts.
  35. Ampeg V4 questions on cap value
  36. Sunn Model T reissue thudding
  37. Peavey CS800X 50 watts per side max?
  38. Who knows acoustic pickups?
  39. Gibson GA 5t whitepanel making crackle, pop, fizz
  40. Reverb Oscillation
  41. Standel preamp module
  42. Kustom IV Bass Head Schematics?
  43. 6L6GC, wired one-pin off CW kills bias probe
  44. amp help
  45. Ampeg B2 head scratcher
  46. Deluxe reverb RI blowing fuses only occasionally
  47. fender passport 250 circuit diagram
  48. Carvin R600 Output relay problem
  49. Ampeg V4 Standby Problem
  50. Please Help with a difficult Ampeg SVT PRO 4 repair
  51. Yorkville NX750P
  52. Deluxe Reverb RI. power trans have thermal fuse?
  53. Rusted on Fender Deluxe Reverb knobs
  54. SF Twin Reverb with VERY microphonic V2 stage w/Norm & Vib Vol's CCW
  55. MAC 4C A52 (schematic could really help..)
  56. Power tranny specifications - need help
  57. Noisey pre-amp in an old SS bass head. I need ideas.
  58. Peavey eddie van halen amp.
  59. JCM900-4100 OT connundrum
  60. Behringer GMX110
  61. Carlsbro Viper 100 Bass Amp
  62. What brand of Solder and heatsink grease do you buy?
  63. Ashdown MAG 250 - blowing fuses
  64. cheap speakers
  65. odd turn off noise - Fender Princeton Chorus - links to Youtube
  66. Low freq. excess in Fender Frontman 25r
  67. How do I connect a variac?
  68. Output tranny ID please
  69. Safety: testing Electrical outlets
  70. General question concerning reel to reels
  71. GT120 project that needs a helping hand
  72. Fixed ticking vibrato in 71 Deluxe Reverb using old tube
  73. Marhsall 1962 Bluesbreaker reissue - low power problem
  74. Orange Thunderverb 200 bias current
  75. Can one bypass a PS choke for the purpose of troubleshooting?
  76. Marshall MG15 Hums on Gain Channel
  77. Fender Super 210 Red Knob - Channel Switching Problem
  78. Univox U1011: couple questions
  79. Help with Envoy 110 please!
  80. vt60 making noise
  81. Farfisa TR-70 OS high pitch problem
  82. SWR 750 blowing output transistors
  83. behringer GMX212 footswitch issue
  84. Valve Jr Fried?
  85. Did I Kill the DC Regulated Power Supply?
  86. Problem with microphonic tubes that are brand new.
  87. Fender Twin & Deluxe Reverb Input Jacks....horrible part!
  88. Merry Christmas
  89. Metty Christmas
  90. Valvestate output boards
  91. Ibanez Thermion
  92. Marshall DSL401 - no FX loop
  93. Crate VC-3112 Re-Cap Question
  94. Marshall 6100 all levels "slow" starup
  95. Blues deluxe--issues
  96. Fender Frontman 212R Distortion
  97. B-52 ATX100 Transformer
  98. Kustom K100-2 Pre-amp transistors
  99. I hate keyboards
  100. Help with Sound City B150 feedback circuit
  101. Fender Princeton '65 Bias (?) Problem
  102. JCM 600 wackiness...??
  103. PCB Trace width on Power Circuits in Ampeg SVT VR & CL amps
  104. SWR 400 Strange Humming/cutting out
  105. Marshall amp hum
  106. Tube socket wiring diagram
  107. Ampeg BT 15 bias transistor
  108. Bugera 1990 Channel Switching Problem
  109. kam kk400 amplifier..
  110. Fender Hot Rod Deluxe : instability when in More Drive mode
  111. Mesa Transatlantic
  112. Roland KC 60 amp
  113. Behringer GMX 212 Help
  114. SVT-CL - Ticking
  115. 7581 Tubes
  116. Behringer BX3000T Schematic?
  117. Traynor YBA-3 - not very loud, bias testing
  118. Peavey Classic 30 Not Switching Channels
  119. Roland Jazz Chorus JC-120
  120. Engl E530 Gain pot problem
  121. Mesa Mark 1 strange resistor lead
  122. Old Gibson Amp
  123. Teac A-3440 recorder
  124. This sounds dumb, but....need help identifying a resistor value.
  125. behringer pmp2000 blowing fuse
  126. Odd Distortion Noise
  127. Mesa Dual Recfifier 3-Ch Solo Head, Ch 1 Oacillation problems
  128. Snap or pop followed by momentary loss of volume
  129. Ampeg B-100 problems
  130. Mesa Dual Rectifier 3-Ch Solo wth LF oscillation from 5U4GB's (SS Mode)
  131. TOA D3 Mixer - "Clip" lights stuck on
  132. Why do some Fender Amps pop and others don't during Standby switching?
  133. Hoffman DR AB763 : Low b+, no sound, loud hum, etc...
  134. Another Hot Rod Deluxe Oscillation distortion
  135. Marshall JCM2000 DSL 401 Volume Problem
  136. Mesa Subway Rocket Low Volume
  137. Bassman Plate Voltages
  138. Mesa Boogie F100 Output Issue
  139. Trace Elliot BLX80...issues :(
  140. Silly Fender Schematic Question
  141. Johnson Millennium 150 and computerized amp thoughts
  142. Sovek Mig 50 making static noise
  143. Randall RG200 help, please
  144. Fender Pro Reverb, Reverb hum and hiss (Pro Tube Series 2001)
  145. Marshall encoder
  146. Super Reverb- reverb hum
  147. Variation of Fender ticking Tremolo suppression
  148. Metroamp 50w kit - problem
  149. Marshall JCM2000. Will a TSL board work in a DSL.
  150. Legend A30 Output section problem
  151. 3 prong on ancient record player?
  152. Axial Lead Electrolytics
  153. Bad Hot Rod Deluxe output trans?
  154. Will Fender LDR Optocoupler Work in Magnatone Amp?
  155. What is the weirdest repair you had to do
  156. Kustom Quad 200HD
  157. A few questions about Carbon Comp (R)
  158. Fender automatic bias
  159. Ampeg B200R Bass Amp
  160. Mesa Blue Angel slightly down on power
  161. Quick question about virtual heater CT
  162. Ampeg SVT-CL Direct Out broken/Noise off standby
  163. Sunn Solos 2 solid state
  164. Twin Reverb crackling/static noise help
  165. Hartke HA 5500 switches off
  166. Hot Rod Deluxe - Help diagnosing problem would be much appreciated
  167. Odd field coil circuit
  168. crackling in amp?
  169. Fender BF 1965 Super Reverb Buzz (with no tubes installed)
  170. How do your remove screws that have thread lock compound applied?
  171. Fender PA100
  172. Transformers; identifying which turn is shoted
  173. Gibson GA 8 Gibsonette oscillation/squeal
  174. Line 6 Spider HD100 MkII
  175. On Semi EOL notice
  176. Old Acoustic Control 370 issues
  177. Early Ampeg V4: breaks up around 3 and now won't turn on
  178. Orange AD30TC - Weird "Ghost Notes"
  179. What power transformer do I need?
  180. Fender Hot Rod Deluxe - Fuse type fast or slow
  181. Layout file for GK 800RB power board??
  182. New Ampeg SVT Heritage amp, Fault Light flashing
  183. Need some help in the UK. Near'ish south of London!
  184. Fender Hot Rod Deluxe Blown rectifier diode and resistor on output tube
  185. Rivera Chubster 40 Blowing F1 Fuse
  186. '78 yba-1 traynor voltages?
  187. SVT Dies on the Bench
  188. Marshall Vavlestate 2000 AVT100 Static Discharge Damage
  189. Orange tranny color codes?
  190. Cyclic Hum....sounds like 'naaahhhhh-ummmmmm......naaahhhhhh-ummmmmmm, 2 sec rep rate
  191. Magnatone 107 / How do I make this 'widowmaker' safe? continued
  192. 60 Hz Quest
  193. Marshall JCM 800 Original Classic 2204S Limited Edition (50 watt small box head)
  194. Ampeg G15 (Gemini 2 with 6L6 power tubes)
  195. Ampeg VH-140C Volume cutting out / can't find any solutions
  196. No Tremolo ?
  197. Marshall JCM2000 DSL bias too hot.
  198. CRATE GX140C- No Channel or Gain Switching
  199. Fender Super 112 - Low Output
  200. OT for Traynor YCV40
  201. Speaking of Hiwatt's hum
  202. ashdown fallen angel 40watt combo buzzing and hissing???
  203. 'New' Bias supply not working..
  204. 6550 power tube current distribution in Ampeg SVT-AV/CL @ 50, 100, 200W/4 Ohm
  205. Gabby enterprises Fake Fender Showman project
  206. GK 400RB Distorted Output
  207. Should one fit R1 to a Marshall DSL 100 preamp is 3
  208. vintage Marshall 2203 HELP its been modded...redplating all 4 tubes
  209. Look what I found!
  210. Traynor YBA-1 Tube Voltage Issues
  211. Need help trouble shooting MOD 102 amp kit.
  212. Carlsbro GLX100 Reverb tank
  213. Traynor ycv40 low output
  214. Help my amp melted down!
  215. Hiwatt Custom 50 Biacrown era Loud Scratchy Master Volume..Help
  216. Mesa Boogie Dual rectifier solo head channel s/w noise
  217. Tremolo apparently on, but not in the speaker
  218. Moving right along to a charming Denon 650f
  219. question about running your own shop
  220. Fender 112 se
  221. Sound City B 150-why is this cap here?
  222. Fender Acoustasonic - Low Volume On One Speaker
  223. Polytone mini-brute has poor sound.
  224. Hum in a Gibson GA8T
  225. How hot should an EL84 run in a class A?
  226. Volume on Normal Channel Control?
  227. Ashdown MAG300, can't get the DC off the output
  228. Acoustic 125 Mystery Bodge
  229. Peavey triumph 120 blows fuse F5A on power up....??
  230. blocking Distortion? 5C3+5c1 custom amp
  231. notices
  232. Reverb Tank for marshall JCM800 ?
  233. CRATE V18
  234. Need help Bugera 6260 head hum problem
  235. Mesa/Boogie Dual Rectifier problems after power surge
  236. Peavey Mega Bass SS Rackmount - Low Output
  237. Peavey Envoy issues
  238. Reverb problem, Fender Stage 100, again...
  239. Melody HiFi problems
  240. Return of G K 400 RB.
  241. Laney AOR help
  242. Fender Bassman 10 Repair/Restore
  243. Holland Amp: On board reverb drives a speaker directly?
  244. SVT lll pro fan again
  245. Gibson GA15RV no reverb
  246. On the look out for a tube tester!!
  247. 220v to 120v Transformer Conversion
  248. VCD leakage in bass amp?
  249. Peavey Mace VT Problems
  250. TSL100 signal passing at zero volume and gain