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View Full Version : Maintenance, Troubleshooting & Repair



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  1. What's this in a Mesa?
  2. 1975 Fender Pro Reverb P/P Master w/5AR4 - Schematic?
  3. Laney AOR Series Pro Tube 50 power transformer specs
  4. 75 Bassman Ten normal channel bass control not working.
  5. Fender stage lead II channel switch
  6. Laney VC15 channel switch problem...??
  7. Sound City - Concord - Tube Amp - No Signal - Please HELP
  8. GK400RB-III 1 output blown
  9. Lone Star Special screen resistor value
  10. Fender Blues Junior
  11. Fender Electronic Echo Chamber
  12. I dropped my amp and now it hisses again! Help!
  13. Gibson G 30
  14. Can cap replacement for 78 Vibro champ
  15. Strange sounds from a Peavey Butcher
  16. Need help with EA-28RVT Epiphone
  17. Ampeg Gemini 2 standby switch
  18. blues jr - 20v difference on each side of OT
  19. De-humming an Ampeg B-12-XY...........
  20. Hiwatts"Custom 20" ptp
  21. Silverface Champ PT wiring
  22. Bugera joke?
  23. Maine Amplifier Reverb Tray
  24. Am I burning up my EL84 tubes with a 439V anode?
  25. Traynor YGM-4 Hum
  26. Powerup thump Valvestate 8200
  27. Orange Tiny Terror 7/15 watt..... power but no sound
  28. Fender TV front pro amp serial number 733 need speaker
  29. Ideas for intermittent on Gallien Krueger 1001RB
  30. 5E3 using Hammond 291BEX
  31. Traynor YBA-3 Power Xformer making arching noise, Is it about to fry?
  32. 1M pots measuring 500k...? And other pot problems.
  33. What can you tell about a power tube's condition when visually inspecting it?
  34. Marshall dsl 100
  35. Ampeg v-6b multitap inductor replacement ideas?
  36. Dead Selmer treble 'n' bass 50 SV
  37. Valve orientation tab broken... recommendation
  38. Fender Super Reverb RI ugly low volume distortion
  39. Pignose Swallows 30 Watt Speaker
  40. Princeton Silverface Reverb Problem
  41. Peavey 5150 II no sound. SEARCHED ALL OVER! PLEASE HELP!
  42. Low bias on Rivera Pubster
  43. Fishman Loudbox Pro - intermittent output
  44. Fender champ 25 '92 bias
  45. Bad House Power Causing Bad Tone?
  46. Replacing 6L6s with 5881s - JMF Spectra 60t - No Bias Adj - Mod Suggestions?
  47. Getting shock on input jack of a Canadian-Noname-Pepco
  48. Univox U-45B Low, Distorted Output
  49. Help Troubleshooting 60's Deluxe Reverb AB163 Amp
  50. Vintage Club 30 Distortion problem
  51. Marshall AVT 150 no effects
  52. Silvertone 1484
  53. Sunn Alpha 112R combo
  54. Trace Acoustic Dynamic Correction Module
  55. Valvestate 8040 neg vdc on output
  56. Ampeg Noise
  57. Crate CR100-EV Potentiometer
  58. Fender 75 Combo...vintage....
  59. Marshall Mosfet model 3210
  60. Marshall Major restoration
  61. Low Bias Voltages on Fender 140
  62. Yorkville-Traynor YCV40 preamp noise troubleshooting (2nd try)
  63. Engl E530 problem. Help!
  64. OLd Fender Twin Sliver FAce Amp
  65. Traynor YBA-1 Master Volume
  66. A question , if a preamp 12AY7's cathode resister connection was open to ground
  67. Sub for 1ss146 diode ? Any cross reference charts for diodes???
  68. 6v vs12v heater
  69. KT88's Redplating
  70. VOX AC30 C2 solid state rectifier PT + schematics needed
  71. selmer treble & bass 50 reverb
  72. jcm 800 2204 120 Hz hum
  73. Behringer power amp burnout
  74. Multivox Tape Delay No Erase
  75. Marshall Plexi circut noise..minor sizzle on top of notes
  76. Line 6 Spider jam output device type - TDA7????
  77. Dano Centurion problem
  78. How long are Sprague Atom filter caps good for time wise?
  79. Kustom 400, burned 100 ohm resistor
  80. Just found a weird one, might be useful to you
  81. Behringer BX4500H no output
  82. Super Champ XD PT?
  83. What to charge for???
  84. Advice for swapping output transformer in Koch Twintone
  85. fender amp vibrato plate voltage
  86. Standby hum - this one is a first for me...
  87. Univox U-1226
  88. Radio Frequency in Amp when Guitar Pot Volume is at minimum
  89. Need Help - Ran Amp with No Load
  90. Fender Super Champ (Rivera era) - 1N5234B/6.2v Zener ?
  91. Troubleshooting an homebrew amp: Stanby off = sound fades away
  92. Mesa 5 50 low volume
  93. Vibro Champ Indicator Lamp Wiring
  94. Peavey booster schematic request
  95. Noise Floor Hiss From Rivera Knucklehead Tre Head
  96. Hartke HA3500 Transient Attack Bass head making 'woofing pops' while playing
  97. Randall RG50TC Volume problem
  98. Is a 6AQ8 almost equivalent to a 12AX7? Are they interchangeable?
  99. Hum From Vertically Mounted Reverb Pan
  100. Marshall Artist 4203 reverb not working
  101. Peavey 5150 Loud Static when switching standby on/off
  102. Deluxe Reverb Reissue - 2nd PT Blown... going for THREE!
  103. Speaker swap now no bass
  104. Marshall JTM 30 bias mod question
  105. Compensating a tube amp for oscillation
  106. Fender75 Power Switch
  107. Dead PA any Suggestions?
  108. fender blues deville first edition, distorted clean channel
  109. Silvertone 1474 &*^%$#
  110. Marshall DSL hum
  111. Unfamiliar capacitor in Premier amp
  112. Crazy sounds--Fender amp
  113. Sho-Bud Repair... Help Needed Please
  114. Eden Metro schematics? Pre-2000 power supply.
  115. Selmer Zodiak Treble & Bass tremelo low hum
  116. Randall RG100G3 with issues
  117. Looking for Switchcraft N114BPCX jack
  118. Blues Jr issue
  119. Marshall SLP
  120. Line6 Spider III 15 channel switch problem
  121. Holden wasp phase invertor problems
  122. Tung Sol 6V6 Reissue consistent problem
  123. Fender Rumble 75 speaker
  124. Carvin Valve master/ Stage Master 212
  125. BIAS , Ampeg VT-22
  126. Why does my Elk amp sound like a dishwasher?
  127. Peavey C30 - Quiet then no sound.
  128. I broke my DRRI....help red plating
  129. Fender Deluxe Reverb Scope / Wave question
  130. Ampeg BA115 - Max VDC on Speaker Out?
  131. Kasino 8 channel powered mixer
  132. rustling noise from Champ-a-like
  133. Replacing unknown reverb tank in Airline 62 9017 amp
  134. Bugera 6262 problem please help !! Desperate.
  135. Bugera 6262 problem please help !! Desperate.
  136. Gibson G35 ss Amp
  137. Peavey Bass 400 Series A: Short with Load Attached
  138. Crossover distortion with my 6L6 from Eurotubes
  139. Ampeg sj 12 T 6L6 and EL34 Biasing
  140. Marshall Haze 40 shorting out?
  141. Selmer Treble and bass Zodiak 100 tremelo hot tube socket
  142. Crate Stealth 50 combo - self inflicted issue
  143. Vibro Champ capacitor questions
  144. Multi-Cap question on unknown vintage amp.
  145. Picture of Laney AOR50 Switching pot?
  146. Selmer zodiak 100 tremelo voltage specs
  147. PV 1.3K won't drive 2 ohms with DDT on
  148. OT for a Univox 255r
  149. Vexing SM-400 (old TO-3 version) power amp problem
  150. JCM2000 DSl100 noise issue
  151. Crate GX-140C Blowing Fuse
  152. Silvertone 1484 Twin Twelve - Restore Pics
  153. problem posting.
  154. Silvertone 1484 Twin Twelve - Channel EFX Questions
  155. Standel 25L15 amp
  156. 5150 mkII won't come out of standby
  157. Mesa Stiletto 50Hz rumble
  158. SF Twin Reverb hum problems
  159. Problem with new Mojotone 5E8-A build
  160. Laney GH100L issue
  161. 1967 Farfisa TR-60
  162. Sourcing Mesa footswitch switches?
  163. PT test questions?
  164. SVT Pro 4 slow input current rise
  165. Gallien Krueger 700RB intermittent protection mode
  166. Selmer treble and bass sv
  167. Valvestate AVT 150 o/p chips failure
  168. Ampeg BA210
  169. 5E3 fuse issues
  170. Problem with my amp is bugging me at work and looking for help.
  171. Solid state amp hiss
  172. Mesa Studio .22 troubleshooting
  173. Mesa Simul 295 bias issue
  174. Partridge Transformer DR-504
  175. Marshall JCM800 50w Head 2205 - it's lacking power and so am I
  176. Marshall JCM2000 TSL Hum
  177. Suggestions Wanted For 9v Batteries That Won't Leak
  178. Need help, Vox Mini 3 annoying noise
  179. What LED type for the "amp select" section on a Line 6 Spider IV 150W?
  180. Substitute for IN749 diode needed
  181. Vintage Ampeg BT15 Help
  182. Got a request for advice that I can't directly answer -
  183. 80's Super Champ
  184. Fender Prosonic transformer coupled noise
  185. Replacement fan for Marshjall 9200
  186. Ampeg SVT
  187. selmer zodiak T n B 100 tremelo blows fuses
  188. Intermittent buzz in vintage tube amp (Silvertone 1472)
  189. Roland JC-120 HELP!
  190. No short w/ bulb, short w/o bulb
  191. Super Reverb AB568 Bias Question
  192. (first post!) looking for a good 4 ohm 12" speaker??
  193. Ampeg B100R - nothing but hum
  194. troubleshooting a 5E3 with distorted sound
  195. resonating 'c' note in 2x12 cab. Any ideas?
  196. Fender Hotrod Deluxe reverb problem
  197. Bandmaster noise issue
  198. Gibson GA50T tremolo
  199. EARTH super bass producer series output transistor ?
  200. Blues Deluxe +/- 16v resistors
  201. Tung Sol 6v6 Reissue- underspec'd?
  202. Mesa Boogie 5:50
  203. Pilot?
  204. BV120H Two power tubes not working but check out ok
  205. Laney LC15R - which ECC83 goes where ?
  206. Weird power tube AC grid situation
  207. Stereo outputs on Orange Tiny Terror
  208. GK Backline 600 channel problem
  209. PV studio pro -old version
  210. Fender Concert pot bracket resistor
  211. Fender HRDIII foot switch lag
  212. Marshall IBS 3520 200 watt problem
  213. 5E3 PROBLEMS: oscillation and hum issues... HELP!!! 1961 GIBSON GA-6 LANCER
  214. Ampeg B115 Transistor Suggestions
  215. dumb question
  216. Crate dx 212 preamp schematic
  217. Silvertone OT bad?
  218. Marshall MG100 HDFX problem???
  219. So many problems with my DRRI !
  220. Marshall 6101 problems tracing a short
  221. Marshall Integrated Bass System 5510
  222. AC on chassis
  223. Help to identify amp components?
  224. Fender Twin Reverb/"custom" Vibrolux Reverb foot switch noise
  225. rat shack or fluke
  226. Marshall 5210 thunderstorm problems
  227. Peavey Triple X head problems
  228. Kalamazoo Bass 50 Microphonics or PO?
  229. Help with Engl screamer schematic.
  230. Marshall MG100DFX Combo problems!
  231. Heater Winding Short - Bad Design or Coincidence?
  232. Ampeg VL-1002 Volume Problems
  233. MusicMan 2275-130 Bias question
  234. Lab Series L9 Circuit breaker Source
  235. Enzo Man Would You Quit Double Posting
  236. D. Boyden amp (did one of you guys build this?)
  237. Does Mouser sell Guitar potentiometers ?
  238. Blackface Champ OT question
  239. Marshall 8080 Valvestate push button switches
  240. Peavey Session 500 Mark IV - Loud buzz when turned on
  241. Fender 112 Deluxe plus hot output transistors and farting
  242. Standel tremolo circuit - Can anyone ID this transistor?
  243. KC-500 amp repair question
  244. souncraft /gigrac 1000- power supply problum
  245. Vox AC30 grid stopper burn
  246. Heat sink question
  247. Rath-Amp Retro 80 repair - crackling sound, overdrive channel broken
  248. Rocktron Intellifex LTD service manual and help troubleshooting
  249. Peavey Classic 50 watt amp setting bias
  250. Peavey Windsor Input Jack Problem?