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View Full Version : Maintenance, Troubleshooting & Repair



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  1. S30-A Bremia Tube amp.
  2. Tech help needed. Different readings between direct plate, cathode & bias probes.
  3. Obscure Guild Maverick Amp (7591's) VERY low volume/not working.
  4. '69 bassman troubles
  5. No plate current, but why?
  6. [rebuild] SUNN A212 Combo
  7. Carvin X100B Reissue Issue
  8. fender rhodes power transistors
  9. does this sound like a bad solder?
  10. Help needed with Frontman 15G input jack replacement
  11. Mackie SRM450 tweeter replacement?
  12. biasing 1966 BFSR
  13. Solved a reverb feedback problem read on to be enlightened.
  14. sound city 50r mk 3 reverb tank
  15. Line6 AX2 Modeling Amp Emits Solid Tone When Switched On
  16. Reducing noise in Carlsbro valve PA head
  17. Fender DRRI OT replacement
  18. Two-Stroke Amp loses volume intermittently
  19. Amp Tech in Gdansk, Poland?
  20. JC 120 went Pfft!
  21. Bugera 6262 combo..here I go again
  22. Marshall Valstate 100r - No distortion
  23. Anybody have a legible TC-142 schematic?
  24. Weird amp hum
  25. Carvin Legacy 100 head arcing issue
  26. Fender Bassman SP3100 "moaning"
  27. Magnatone MP1 help
  28. Peavey Triumph 60 Effects Loop noise
  29. Preamp negative grid voltage, oscillation?
  30. Laney Klipp 60
  31. Kustom PA 300 DC on output and lots of it!!!
  32. Fender Musicmaster Bass amp fuse holder
  33. Vox AC30 reverb model with loud hum(strange AC30 problems revisited)
  34. Fender roc pro 1000
  35. Peavey CS-400
  36. Ampeg V4 distortion model
  37. V-amp problem
  38. SWR Workingman 300
  39. Marshall JCM2000-60W: Serious damage from whiskey spill!
  40. Is this cap cooked?
  41. Soundtronics Custom300 7027 screen resistors?
  42. Please help me troubleshoot my Roland JC-160!
  43. Wierd Blues Jr problem-helps
  44. 5150 combo keeps blowing fuses
  45. gibson g20 troubleshooting help
  46. Marshall JCM 2000 DSL
  47. VOX AD100 motorboating / machine gun sound out of nowhere...
  48. Pictures of wiring, ab763 reverb parts
  49. peavey triple x head problem with effects loop
  50. Power transformer--how hot is too hot?
  51. Makeshift rig - buzzing
  52. GK 800RB Mystery
  53. Princeton Reverb tremolo broken, everything else works great
  54. SWR Bass 350 Capacitor rating?
  55. Pro Reverb questions:
  56. Super Reverb vibrato thumping, channel interaction
  57. amp cuts in and out
  58. the ol' hot rod deville...more drive not functioning
  59. Vintage Ampeg blowing fuses, indicator lights on dim when amp is off...
  60. Peavey Stereo Chorus 212
  61. Gibson Atlas 3gang pot wiring
  62. Harke HA4000 no sound just a very low distorted sound, What could it be the problem?
  63. Fuse blows for no reason?
  64. Silvertone 1449 help.
  65. Kustom k-200B - 4 No Output
  66. Is this Output Transformer Shot...?
  67. 7591 glowing screen on Panaramic (Magnatone/Audio Guild)
  68. 1973 super NO reverb
  69. Power transformer gets very hot after one minute idle
  70. I Learned Something Today
  71. Ampeg R212R Reverberocket
  72. Rectifier tube/Power tubes causing fuse to blow?
  73. Mesa Boogie Studio Caliber DC-2 Recording out noisy, any ideas on how to improve it?
  74. possible water damadge to a new traynor ycv40wr
  75. Fender Twin preamp fuzzing/crossover distortion
  76. JCM 800- neg voltage too negative
  77. KMD XV100SD Head Produces "Static Crescendo"/Popping
  78. Marshall amp has halfed its ouput volume
  79. Marshall 6100 LM blows fuses after tube swap! Help!
  80. Eden wt 400 issues
  81. SWR SM-900 Popping
  82. Roland JC120 - Weak/Distorted Chorus and Vib output
  83. Noob would like guidance setting bias for new EL34s in a Haze 40w Combo
  84. Marshall JCM2000 bias
  85. HELP NEEDED! Hot Rod Deluxe Volume drop.
  86. Anyone willing to help a n00b replace a PT in a working 1967 Super Reverb?
  87. Draining Filter Caps - Best place to meter.
  88. Crate Power Block 150 high frequency oscillation
  89. What Happened To My Amp??????
  90. struggling to hear my self onstage , having to rely on onstage monitoring
  91. AT100 Resistor mystery?
  92. Marshall valvestate 8008
  93. Acoustic 906 Mixer/PA problem
  94. Help solving Fender Hot Rod DeVille 410 reverb problem
  95. Need help replacing a broken transformer
  96. Princeton (NR) has kind of soft bottom end
  97. Peavey JSX flyback diode replacement
  98. weber princeton reverb clone a bit short on power
  99. Fender Hot Rod Deville Filament Winding Problem
  100. Pots for Ampeg VL series Guitar Amps?
  101. Lead Free desoldering help!
  102. Hartke 3500 Mosfet EQ Problem
  103. Valvestate VS100 parts
  104. Peavey ValveKing 100w head/ lead ch low volume
  105. Would I have a need for a 32-3 Regulated DC Power Supply as a casual amp hobbyist?
  106. Crate GFX 212 very low distorted output
  107. sound city 120 mk iv bias
  108. Peavey 5150 (mk2) bias
  109. Chorus and Reverb dead on Marshall AS50R......
  110. Fender Hot Rod Deville problem
  111. one marshall amp fixed . problem ? crap factory workmanship
  112. transistor troubleshooting
  113. Need Help With From Someone Wth JCM2000 DSL100
  114. '90s Fender Blues Deluxe wont make sound
  115. Crate Turbo Valve 120-Loss of sound
  116. channel 1 on my 1981 ampeg V3 is only barely audible
  117. '88 Princeton Chorus Ground Hum
  118. Output Transformer Failure?
  119. Hot Rod Deluxe Channel problem
  120. Peavey Encore 65 problems
  121. Behringer GMX212 problems
  122. 6v6 cathode bias question
  123. Peavey 5150 suddenly squeals
  124. drastic volume drop on marshall avt 100
  125. Power Transformer 6.3V Secondary Center Tap....
  126. Purpose of Center Tap on Full Wave Bridge?
  127. loud hum in 135 watt Twin (UL)
  128. Input problem
  129. Fender 212R power amp blown
  130. LM3886T?
  131. Fender Deluxe 85(red knob) Low overdriven output
  132. Peavey TKO 65 distorted/low output
  133. SF Champ problem...
  134. Bassman RI troubleshooting
  135. Bugera 333 filament question
  136. X2 capacitors for Rivera amps
  137. Blues Junior Low Output
  138. Marshall JCM2000 DSL100 Blowing Up Feedback Circuit
  139. Demise of the Incandescent Lamp?
  140. Testing A Preamp
  141. Gibson GA5-T Skaylark Capacitor blew up
  142. Marshall AVT 100 TDA7293 chip
  143. Ace Peppers P-Matic - slight amount of hiss
  144. 77 twin reverb
  145. Marshall TSL122 sudden volumedrop
  146. Ampeg V4 filament problem
  147. add bias pot to 1988 Carvin X100B EL34
  148. Fender Roc Pro 1000 Channel Switch issue
  149. Peavey Classic 50 lead channel volume drop
  150. New tube in Marshall VS100
  151. Black Face Deluxe Reverb noise issue
  152. all tubes light up but rectifier- Drz Z-28
  153. Arcing Issue
  154. Have four mackie hd1531 powerd speakers all with the same issues, need some help
  155. Wiring a Fender style lamp with 110v, dropping resistor 100k ??
  156. Schematic for 96 Marshall VS100
  157. Epiphone Valve Senior Combo problem
  158. Fender Reverb Head Scratcher
  159. Regal Music amp
  160. Epiphone Galaxie makes buzzing noise
  161. Not Enough Bias Voltage?
  162. '65 TRRI squeals when input is unplugged
  163. Learning the hard way not to take shortcuts
  164. problems with 15 volt power supply in Eden amp
  165. Resistor value question
  166. Grainy/Trashy noise on tube amp
  167. Peavey 6 pin din replacement help
  168. replacement speaker for polytone mini bruteII
  169. Red hot coil in the centre of 6P14P-EV
  170. Best 1/4 Inch Input Jack
  171. Peavey 400BH
  172. Matchless Clubman oscillation
  173. Polytone Mini-Brute I hums
  174. GS15r ampeg gemini reverb out
  175. 18 watt Brownote
  176. Capacitor Voltage rating Question
  177. Problem with new build (dark sounding)
  178. Somebody set up bias on a princeton reverb ri??
  179. Fender Super60 + HARLEY BENTON G412A VINTAGE
  180. SELMER TV6 troubles
  181. fender blues jr problem
  182. Crate BV6212 "Self-Biasing"
  183. Customer of the Month
  184. Problem with excessive current draw
  185. ticking 5F1
  186. Humming Univox U 155
  187. Bias on a Carlsbro 50TOP Evo
  188. Results of light bulb current limiter ?
  189. Best quality octal sockets for 71 superlead?
  190. balancing the bias of quads on SF twin
  191. Mesa .50 caliber with red plates
  192. JCM2000 TSL100...what does this mean?
  193. Amp cutting out
  194. Total noob moment...
  195. Kustom 150SC pops when turned off and on
  196. Marshall Mosfet 100 (5213) Reverb Not Working, Also not the tank
  197. Bad 60z Hum
  198. 5150 Combo problem
  199. Fender SKX-65R non-functioning reverb, NOT the reverb tank
  200. My Palomino V16 stopped working
  201. Jackson JG-2 50 Watt - Intermittent Problem
  202. HeathKit TA-16
  203. Hot Rot De Ville 212 - 2002
  204. Traynor TS120B bass amp
  205. Silvertone 1474 heaters out on both 12AX7s
  206. Dual Rectifier - complete gain and volume drop on channels 2 & 3 HELP!
  207. Westbury Model 1000 - Very Noisy
  208. Traynor YBA-2 eats EL84 for lunch B+ too high?
  209. Anyone else have a slow august for repairs?
  210. Leilani amp by Gourley question
  211. Marshall valvestate 8200 poping noise and low volume from left speaker outs
  212. Marshall head rated at 4ohms
  213. Fender Princeton Chorus - Bad Static and Thunder
  214. Music Man RP100
  215. Marshall AVT150H
  216. A.R.T DST-830 SS / Tube analog /digital troubleshoot / repair
  217. EARLY 90's FENDER BLUES DEVILLE SOUNDS REAL MUDDY, CAN'T READ BIAS CURRENT
  218. Ampeg BA115HP trouble
  219. Just curious if there are any other youngish guys or even gal techs or shop owners
  220. SFVR calls for 5UR4 but has 5AR4
  221. Ampeg B2R
  222. Purpose Of Series Input Resistor?
  223. JCM900 Power transfromer in Europe
  224. How to Lower B+, to compensate for S.S. rectifier?
  225. Behringer Europower PMP1280S power supply?
  226. Ampeg SVT410HLF Cabinet
  227. Distortion problems
  228. Very old Gibson GA20 problem - FIREWORKS!
  229. Scared to plug in motor
  230. Tech things I should've added years ago
  231. Why Do I Do This?-Classic 30 problem
  232. Peavey 400HB revisions/compatibility
  233. 5F6A build shorting/low voltage on power tubes
  234. Marshall MHZ40 footswitch problem
  235. Neon/LDR Tremolo Repair
  236. Ampeg PortaBass 250
  237. super reverb output values, please
  238. SWR Workingmans 12 - amp blows fuse
  239. Maximum Input Voltage?
  240. Ampeg SVT-II Loud Hum
  241. Tubes glowing blue get extremely hot extremley fast
  242. Cathode biased 6L6 amp (modelled after twin 5c8) very quiet after playing a while
  243. Two Marshall Haze 40's with the same difficult problem
  244. Mackie/Tapco Thump 18 tip
  245. Marshall JCM 800 Lead series 2205, help please!
  246. Crate GXT-100 PT
  247. crate v15 bias
  248. Dumb tube questions
  249. Out of my depth with Stromberg-Carlson AU-34 rebuild!
  250. Silvertone 1484 Replacement Knobs