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View Full Version : Maintenance, Troubleshooting & Repair



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  1. I Learned Something Today
  2. Ampeg R212R Reverberocket
  3. Rectifier tube/Power tubes causing fuse to blow?
  4. Mesa Boogie Studio Caliber DC-2 Recording out noisy, any ideas on how to improve it?
  5. possible water damadge to a new traynor ycv40wr
  6. Fender Twin preamp fuzzing/crossover distortion
  7. JCM 800- neg voltage too negative
  8. KMD XV100SD Head Produces "Static Crescendo"/Popping
  9. Marshall amp has halfed its ouput volume
  10. Marshall 6100 LM blows fuses after tube swap! Help!
  11. Eden wt 400 issues
  12. SWR SM-900 Popping
  13. Roland JC120 - Weak/Distorted Chorus and Vib output
  14. Noob would like guidance setting bias for new EL34s in a Haze 40w Combo
  15. Marshall JCM2000 bias
  16. HELP NEEDED! Hot Rod Deluxe Volume drop.
  17. Anyone willing to help a n00b replace a PT in a working 1967 Super Reverb?
  18. Draining Filter Caps - Best place to meter.
  19. Crate Power Block 150 high frequency oscillation
  20. What Happened To My Amp??????
  21. struggling to hear my self onstage , having to rely on onstage monitoring
  22. AT100 Resistor mystery?
  23. Marshall valvestate 8008
  24. Acoustic 906 Mixer/PA problem
  25. Help solving Fender Hot Rod DeVille 410 reverb problem
  26. Need help replacing a broken transformer
  27. Princeton (NR) has kind of soft bottom end
  28. Peavey JSX flyback diode replacement
  29. weber princeton reverb clone a bit short on power
  30. Fender Hot Rod Deville Filament Winding Problem
  31. Pots for Ampeg VL series Guitar Amps?
  32. Lead Free desoldering help!
  33. Hartke 3500 Mosfet EQ Problem
  34. Valvestate VS100 parts
  35. Peavey ValveKing 100w head/ lead ch low volume
  36. Would I have a need for a 32-3 Regulated DC Power Supply as a casual amp hobbyist?
  37. Crate GFX 212 very low distorted output
  38. sound city 120 mk iv bias
  39. Peavey 5150 (mk2) bias
  40. Chorus and Reverb dead on Marshall AS50R......
  41. Fender Hot Rod Deville problem
  42. one marshall amp fixed . problem ? crap factory workmanship
  43. transistor troubleshooting
  44. Need Help With From Someone Wth JCM2000 DSL100
  45. '90s Fender Blues Deluxe wont make sound
  46. Crate Turbo Valve 120-Loss of sound
  47. channel 1 on my 1981 ampeg V3 is only barely audible
  48. '88 Princeton Chorus Ground Hum
  49. Output Transformer Failure?
  50. Hot Rod Deluxe Channel problem
  51. Peavey Encore 65 problems
  52. Behringer GMX212 problems
  53. 6v6 cathode bias question
  54. Peavey 5150 suddenly squeals
  55. drastic volume drop on marshall avt 100
  56. Power Transformer 6.3V Secondary Center Tap....
  57. Purpose of Center Tap on Full Wave Bridge?
  58. loud hum in 135 watt Twin (UL)
  59. Input problem
  60. Fender 212R power amp blown
  61. LM3886T?
  62. Fender Deluxe 85(red knob) Low overdriven output
  63. Peavey TKO 65 distorted/low output
  64. SF Champ problem...
  65. Bassman RI troubleshooting
  66. Bugera 333 filament question
  67. X2 capacitors for Rivera amps
  68. Blues Junior Low Output
  69. Marshall JCM2000 DSL100 Blowing Up Feedback Circuit
  70. Demise of the Incandescent Lamp?
  71. Testing A Preamp
  72. Gibson GA5-T Skaylark Capacitor blew up
  73. Marshall AVT 100 TDA7293 chip
  74. Ace Peppers P-Matic - slight amount of hiss
  75. 77 twin reverb
  76. Marshall TSL122 sudden volumedrop
  77. Ampeg V4 filament problem
  78. add bias pot to 1988 Carvin X100B EL34
  79. Fender Roc Pro 1000 Channel Switch issue
  80. Peavey Classic 50 lead channel volume drop
  81. New tube in Marshall VS100
  82. Black Face Deluxe Reverb noise issue
  83. all tubes light up but rectifier- Drz Z-28
  84. Arcing Issue
  85. Have four mackie hd1531 powerd speakers all with the same issues, need some help
  86. Wiring a Fender style lamp with 110v, dropping resistor 100k ??
  87. Schematic for 96 Marshall VS100
  88. Epiphone Valve Senior Combo problem
  89. Fender Reverb Head Scratcher
  90. Regal Music amp
  91. Epiphone Galaxie makes buzzing noise
  92. Not Enough Bias Voltage?
  93. '65 TRRI squeals when input is unplugged
  94. Learning the hard way not to take shortcuts
  95. problems with 15 volt power supply in Eden amp
  96. Resistor value question
  97. Grainy/Trashy noise on tube amp
  98. Peavey 6 pin din replacement help
  99. replacement speaker for polytone mini bruteII
  100. Red hot coil in the centre of 6P14P-EV
  101. Best 1/4 Inch Input Jack
  102. Peavey 400BH
  103. Matchless Clubman oscillation
  104. Polytone Mini-Brute I hums
  105. GS15r ampeg gemini reverb out
  106. 18 watt Brownote
  107. Capacitor Voltage rating Question
  108. Problem with new build (dark sounding)
  109. Somebody set up bias on a princeton reverb ri??
  110. Fender Super60 + HARLEY BENTON G412A VINTAGE
  111. SELMER TV6 troubles
  112. fender blues jr problem
  113. Crate BV6212 "Self-Biasing"
  114. Customer of the Month
  115. Problem with excessive current draw
  116. ticking 5F1
  117. Humming Univox U 155
  118. Bias on a Carlsbro 50TOP Evo
  119. Results of light bulb current limiter ?
  120. Best quality octal sockets for 71 superlead?
  121. balancing the bias of quads on SF twin
  122. Mesa .50 caliber with red plates
  123. JCM2000 TSL100...what does this mean?
  124. Amp cutting out
  125. Total noob moment...
  126. Kustom 150SC pops when turned off and on
  127. Marshall Mosfet 100 (5213) Reverb Not Working, Also not the tank
  128. Bad 60z Hum
  129. 5150 Combo problem
  130. Fender SKX-65R non-functioning reverb, NOT the reverb tank
  131. My Palomino V16 stopped working
  132. Jackson JG-2 50 Watt - Intermittent Problem
  133. HeathKit TA-16
  134. Hot Rot De Ville 212 - 2002
  135. Traynor TS120B bass amp
  136. Silvertone 1474 heaters out on both 12AX7s
  137. Dual Rectifier - complete gain and volume drop on channels 2 & 3 HELP!
  138. Westbury Model 1000 - Very Noisy
  139. Traynor YBA-2 eats EL84 for lunch B+ too high?
  140. Anyone else have a slow august for repairs?
  141. Leilani amp by Gourley question
  142. Marshall valvestate 8200 poping noise and low volume from left speaker outs
  143. Marshall head rated at 4ohms
  144. Fender Princeton Chorus - Bad Static and Thunder
  145. Music Man RP100
  146. Marshall AVT150H
  147. A.R.T DST-830 SS / Tube analog /digital troubleshoot / repair
  148. EARLY 90's FENDER BLUES DEVILLE SOUNDS REAL MUDDY, CAN'T READ BIAS CURRENT
  149. Ampeg BA115HP trouble
  150. Just curious if there are any other youngish guys or even gal techs or shop owners
  151. SFVR calls for 5UR4 but has 5AR4
  152. Ampeg B2R
  153. Purpose Of Series Input Resistor?
  154. JCM900 Power transfromer in Europe
  155. How to Lower B+, to compensate for S.S. rectifier?
  156. Behringer Europower PMP1280S power supply?
  157. Ampeg SVT410HLF Cabinet
  158. Distortion problems
  159. Very old Gibson GA20 problem - FIREWORKS!
  160. Scared to plug in motor
  161. Tech things I should've added years ago
  162. Why Do I Do This?-Classic 30 problem
  163. Peavey 400HB revisions/compatibility
  164. 5F6A build shorting/low voltage on power tubes
  165. Marshall MHZ40 footswitch problem
  166. Neon/LDR Tremolo Repair
  167. Ampeg PortaBass 250
  168. super reverb output values, please
  169. SWR Workingmans 12 - amp blows fuse
  170. Maximum Input Voltage?
  171. Ampeg SVT-II Loud Hum
  172. Tubes glowing blue get extremely hot extremley fast
  173. Cathode biased 6L6 amp (modelled after twin 5c8) very quiet after playing a while
  174. Two Marshall Haze 40's with the same difficult problem
  175. Mackie/Tapco Thump 18 tip
  176. Marshall JCM 800 Lead series 2205, help please!
  177. Crate GXT-100 PT
  178. crate v15 bias
  179. Dumb tube questions
  180. Out of my depth with Stromberg-Carlson AU-34 rebuild!
  181. Silvertone 1484 Replacement Knobs
  182. Ampeg svtiii pro relay
  183. Gibson GA5-T Skylark Tremolo Annoyance (6BM8 version)
  184. Peavey Triumph 120 - Bad relay causing bad sound?
  185. Fender Concert
  186. Peavey Mark III - 260C: Getting 40 VDC out to the speaker
  187. 66' twin
  188. Bad Cat Hot Cat build ?
  189. Another Supro... model 88T
  190. Ampeg V-4R repair
  191. Vox UL4120 power amp voltages
  192. Anyone have or know of a good source for beringer parts?
  193. Matching impedence of Marshall Valvestate head to a Mesa Boogie 4x12 cab
  194. Tremolo issue - AB763 amp
  195. Marshall JMP 50W Voltage Question
  196. Remove tube from base
  197. Fender Frontman 212R major issues- PLEASE HELP!
  198. Crate battery amp V-reg problem
  199. 2001 bad cat black cat, vibrating sound
  200. Again Troubles with Roland Bolt-30 - Dead/ Unknown parts
  201. SWR SM-900 Distorting
  202. AA764 blackface Vibro Champ cooking cathode resistor.
  203. Peavey TNT 130, DDT forever active
  204. Need help with SVT II Pro
  205. Bad PS hum on Ultra Linear Twin
  206. Marshall T64/T65 cross?
  207. '59 Fender Bassman Reissue low volume
  208. Peavey Bandit Problem - Hum, no output
  209. Cap ID , Does anyone recognize these?
  210. Peavey Deuce - loosing power
  211. Randall RG80 Hum
  212. Marshall Artist 3203--fizzy, scratchy distortion
  213. Help. Is my Peavey Studio Chorus 210 FUBAR'd?
  214. Power supply capacitors,, What's up?
  215. Bugera 333XL Biasing Instructions
  216. Marshall g100r cd head
  217. Crate blue voodoo werid feedback noise not making sense need help
  218. Dr.Z Z-28 Choke and transformer values?
  219. Marshall Jcm 2000 volume fade out!
  220. AMPEG SVT PRO 7 switches OFF after 2 seconds - why ?
  221. SWR Mo' Bass Rail Problems
  222. Help! 5e3 is making a ocsillation noise
  223. fender pro jr cap & resistor betw plates
  224. Electrolytic replacements for vintage amps
  225. Marshall mf350 mode 4
  226. 64 Fender Pro Reverb Problems
  227. Gibson Sabre
  228. Earth amps are like Peaveys?
  229. Power transformer strong enough for a small SE Tube Amp with 3 tubes ?
  230. Crate Amp GLX65
  231. Power transformers - OK to use 240VAC primaries with a 230VAC power outlet?
  232. Sunn Concert lead PA
  233. Help with Crate CA-125 Acoustic Amp
  234. Problems on Marshall Valvestate vs100 (Head) - tha amp hums and no sound
  235. Output Transformer Troubleshooting
  236. Twin reverb sparky distortion
  237. '66 Blackface bassman choking from oscillation (??)
  238. Acoustic 370 Amp Power Module Troubleshooting Question
  239. Vx Valvetronix VT15
  240. Ampeg b25b problem
  241. Bias current sweetspot for 1975 Princeton?
  242. DSL401 resistor value concern
  243. SWR Workingman's 2004...fuse F1 value?
  244. Mesa Boogie F-30 Dead Channel Issue?
  245. Blackfaced SF Twin Reverb issues
  246. Crate RFX120
  247. Peavey Mace VT 2x12 // Sounds like ring modulator, Help!
  248. 2205 reverb drive transformer.
  249. Peavey Classic VTX very low B+
  250. Peavey TNT 115 Oscillating