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View Full Version : Maintenance, Troubleshooting & Repair



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  1. vintage Marshall 2203 HELP its been modded...redplating all 4 tubes
  2. Look what I found!
  3. Traynor YBA-1 Tube Voltage Issues
  4. Need help trouble shooting MOD 102 amp kit.
  5. Carlsbro GLX100 Reverb tank
  6. Traynor ycv40 low output
  7. Help my amp melted down!
  8. Hiwatt Custom 50 Biacrown era Loud Scratchy Master Volume..Help
  9. Mesa Boogie Dual rectifier solo head channel s/w noise
  10. Tremolo apparently on, but not in the speaker
  11. Moving right along to a charming Denon 650f
  12. question about running your own shop
  13. Fender 112 se
  14. Sound City B 150-why is this cap here?
  15. Fender Acoustasonic - Low Volume On One Speaker
  16. Polytone mini-brute has poor sound.
  17. Hum in a Gibson GA8T
  18. How hot should an EL84 run in a class A?
  19. Volume on Normal Channel Control?
  20. Ashdown MAG300, can't get the DC off the output
  21. Acoustic 125 Mystery Bodge
  22. Peavey triumph 120 blows fuse F5A on power up....??
  23. blocking Distortion? 5C3+5c1 custom amp
  24. notices
  25. Reverb Tank for marshall JCM800 ?
  26. CRATE V18
  27. Need help Bugera 6260 head hum problem
  28. Mesa/Boogie Dual Rectifier problems after power surge
  29. Peavey Mega Bass SS Rackmount - Low Output
  30. Peavey Envoy issues
  31. Reverb problem, Fender Stage 100, again...
  32. Melody HiFi problems
  33. Return of G K 400 RB.
  34. Laney AOR help
  35. Fender Bassman 10 Repair/Restore
  36. Holland Amp: On board reverb drives a speaker directly?
  37. SVT lll pro fan again
  38. Gibson GA15RV no reverb
  39. On the look out for a tube tester!!
  40. 220v to 120v Transformer Conversion
  41. VCD leakage in bass amp?
  42. Peavey Mace VT Problems
  43. TSL100 signal passing at zero volume and gain
  44. ampeg svt 3 pro tube drive question
  45. Princeton chorus schematic?
  46. Thomas Vox Repair Boards Update
  47. Heathkit - power supply question (replacing diodes)
  48. Bugera 333xl switching problems.
  49. Power Transistor Help
  50. Fender Twin 135 Watt
  51. Traynor YBA-1 oscillating!
  52. Info about 12AT7 tube
  53. Peavey 5150 combo won't switch channels
  54. Who makes this fitted grommet for tube hold-down clamp opening?
  55. Carvin X-60 channel switching issue.
  56. Traynor YGL-1
  57. EL84 tube clamp, in a pinch......
  58. Drain Caps on valve king 212 (same as valveking 100 head).
  59. Going Pro...M.I. Amp repair
  60. Question for those who have stared at a scope screen for decades
  61. TFL5005D: carbon between contacts on solder side of output tube socket?
  62. Champ 600 with MM upgrade kit
  63. I'm a commercial jet engine technician.....but
  64. dearmond silver foil pickup help for rescue! reposted from gtr tech forum.
  65. trouble uploading my 3, 125kb pictures to this forum
  66. DC at output of GK 700RB II amp
  67. fender princeton chorus (1988)
  68. Ground like hum on 1968 Bassman
  69. Hot Rod Mayhem!!!
  70. Duf Two Stroke amp
  71. Fender HRDx Effects Loop Question
  72. Ampeg SVT 4 Pro 10V dc offset
  73. Silvertone 1340. Broken, Lost and Confused
  74. Line6 Spider 4 150 with sound issued... No clean settings
  75. fender 212r output stage issue
  76. VOX ac 30
  77. UL Vibrosonic (Twin Reverb) Phase Inverter question
  78. Behringer only hums in church
  79. Crate BT50
  80. noisy tube issues
  81. Roland KC-350
  82. Ampeg SVT II (SLM) Gnarly Hum
  83. 5f1: Transformer swap. Questions on voltages
  84. loudspeaker parts
  85. Marshall JCM900 Channel Switching & Pedal Wiring
  86. Gibsonette: Field Coil speaker question
  87. Fender Blues Jr.....
  88. fender bassman 200
  89. fender stage se112 - warble at low volume
  90. Fender Acoustasonic Junior (pre DSP) - reverb hum
  91. peavey 5150 1st gen combo
  92. B52 212 - Are Bias Instructions the same as B52 100?
  93. Crate BV6212 Diode Shorting
  94. 50's Danelectro Tube Tremolo (Vibrato) circuits, Octal tube, which?
  95. Quick +/- rail voltage question
  96. Ampeg SVT 4-Pro repair help
  97. fender rhodes transistors
  98. Deville 410 noise
  99. Fender FM 212R SS Amp Vol cut
  100. Popping at startup?
  101. Laney vc15 PT failure
  102. Ampeg SVT 350H: Troubleshooting/repairs
  103. Power supply transformer 26-0057-A for a Digitech VTP-1 Dual Channel Tube Preamp?
  104. Problem with a Peavey 6506
  105. Fender performer 1000 (PR209) broken reverberation unit
  106. Fender HD deville no sound in drive channels
  107. RF Mystery. My Supro is picking up radio stations. Need help..
  108. Gibson Skylark GA-5T Repair
  109. Brown Face Fender Bassman Approximate age?
  110. Gallien Krueger MB150e 112
  111. Sunn Solos schem?
  112. The Bucking Transformer
  113. Marshall JCM 2000 Preventative Maintenance issues
  114. Burman 501 combo blows fuse
  115. Silvertone 1474 Chassis Question
  116. Peavey SP-2G
  117. Mesa Triple Rectifier 3 Channel (2000 PCB) noise issue ? (Hum & Buzz)
  118. Crate VC5310 power tube failure ,and fuse blown.
  119. Marshall JCM800 2203 Blowing Mains Fuse
  120. Peavey PV2600 problem
  121. EQ slider question
  122. Trace Elliot RAH600SMX power amp fan speed
  123. Ampeg b200r rattling fix?
  124. Ampeg V3 voltages high
  125. Roland Cube 80XL question
  126. Fender Hot Rod Delxue channel switching issue
  127. Quieting a Polytone MB II hissing/mild crackling noise.
  128. JTM60 combo blowing filament fuse
  129. Musicmaster layout
  130. Peavey Ultra Plus "gotchas"
  131. Fender Stage 1000 footswitching problem
  132. Blues Jr. burned trace
  133. MusicMan HD130 combo transistor driver oscillation
  134. bias adjustment ?
  135. SWR SM 900 -15v rail trouble.
  136. hit the jackpot...I think
  137. What is considered a "professional" PCB trace repair?
  138. 1966 Gibson GA20-RVT Reverb
  139. Bias Problems in a New Build
  140. Bugera 1960 Bad Distortion When I Play Hard
  141. Crate V18 SMPS blowed up good...any solution?
  142. Fender Stage100 combo, reverb problem, can someone please help ?
  143. Of course I plugged it in. Do you think I'm stupid?
  144. Ampeg VT-40 Red Plating
  145. Fender HR Deville delayed channel switching
  146. 1975 Eventide Instant Flanger
  147. Maxi Mouse lectrosonic charging problems
  148. Mesa Single Rectifier Solo 50 - Blowing Fuses even without valves
  149. 1970's Orange OR120 Screen Resistor Value
  150. De-Soldering Lead-Free Solder PCB joints
  151. Mesa 3 ch DR clean channel squeal
  152. Carvin Pro Bass 100 Questions
  153. Sound City 50+ Reverb
  154. Anyone know the right tubes for this? Wabash Deluxe / Danelectro
  155. deluxe reverb noise problem?
  156. A personal first, I repaired a vintage tube
  157. Fender HRD
  158. Ampeg cracks me up
  159. How to ID an output transformer
  160. peavey pv500 power trip
  161. Fender Ultimate Chorus power amp repair
  162. Ashdown Mag 300 EVO II help needed.
  163. FX loop oscillates
  164. TC Electronics BG250 bass combo
  165. Yorkville E215 cabinet
  166. Mesa Mark III purple stripe Humming.
  167. Marshall JCM 900 fried! Need help :)
  168. Crate CA120DG Durango power amp problem
  169. Gallien-Kruger 400RB 2x10 combo problem, no signal to speakers.
  170. Peavey KB300 pots
  171. Traynor YBA-1A
  172. Gibson GA-79RV Troubles
  173. Gretsch Chet Atkins Country Gentleman 6160 combo amp bright switch problem
  174. Ampeg SVT-3pro help
  175. Behringer GMX input PC board rebuild?
  176. Sound City 120MK4 Bias mod, a slight return
  177. Amp Head blowing fuses
  178. Peavey VK100 no power to tubes!
  179. mesa express 5:50 contour circuit does not work there is no resistance in PCB !!!!!
  180. Seeking advice on Vox VT20+ 120 hz Buzz
  181. Dumbassbob 63 Bandmaster Crackling on Normal Channel
  182. Studiomaster 708 powered mixer amp fault
  183. Tone Control Stack Frequency Response for Traynor YBA-1A Mk II
  184. Yamaha EMX212s shutting down
  185. No bias current reading ?
  186. Hughes and Kettner TubeMeister 36
  187. Vox VT40+ hum issues
  188. SWR workingman's 12 - blows main fuse
  189. Peavey XR600 output and parts Question
  190. SWR SM400 bass amp problem
  191. Blackstar HT soloist 60 out of bias range
  192. vox ac50
  193. Oddball Roland JC-120 Jazz Chorus schematic needed
  194. Guild 98RT: Trem circtuit not working
  195. Stuck With a Vintage Blackface Fender Pro Reverb Repair
  196. Jcm 2000 tsl 100
  197. Trace Elliot GP7 300 Watt version bipolar bear question
  198. VHT Special 12/20RT low preamp voltages
  199. LTPI with CF stage---Fender Studio Bass Amp Output Stage
  200. Peavey TNT100 no output
  201. Fender Studio Bass Amp (EQ inductors?)
  202. Peavey Musician Mark III
  203. Fender Prosonic, Weak bass
  204. Ampeg BA115HPT distortion help
  205. Bugera 333xl no sound on the crunch channel !
  206. Looking for info on Hammond 1618 OT
  207. loud hum in Carte Palomino V16
  208. Bogner Shiva
  209. ID this connector?
  210. Silvertone 1482 Can Capacitor
  211. Radiohm Pot Disassembly, cleaning & reassembly on Allen & Heath Mod 3 Channel Strip
  212. '62 Guild 98RT: need a little help
  213. Kustom 36' Coupe not working
  214. Frontman 212R Hum
  215. Peavey Classic 50
  216. Peavey XR600B loud hum
  217. Sub For FR207 Diode?
  218. Need Help w/ Ampeg BA210SP - blows the fuse, the output is bad
  219. Marshall Valvestate 8100
  220. TDA2006H equivalent
  221. Original JTM45 re-cap & re-tube
  222. Ampeg V-4 arcing?
  223. Acoustic model 450 repair blog
  224. Ampeg SVT CL
  225. Replacement transistors for Marshall 5210?
  226. Gibson Falcon RVT-19
  227. Replacing diodes in rectifier
  228. Mackie HR824 trouble
  229. Metal Gurus?
  230. '70 Twin Reverb - No Vibrato
  231. Behringer V-Tone GMX210 - connector thread broken
  232. 120hz buzz, something fried?
  233. Ibanez TSA15H tubescreamer not working
  234. Ampeg B15NC bias issue?
  235. Roland Cube-40 (Orange) - Does anyone have one?
  236. Boom!
  237. Orange OR100 channel switching issue
  238. What is the supply HT on an orange bass terror
  239. Allen and Heath Mix Wizard 3...14...4...2
  240. Music Man 6L6 or EL34 ?
  241. 1965 Vox Cambridge Reverb footswitch problem
  242. 12" Polytone guitar amp repair?
  243. SState Marshall 5212 Hiss/static after warm-up
  244. Vox Repair PCB in test
  245. PC-based scopes, anyone found a good one for <1000v and audio?
  246. Peavey Musician Mark III...No +15V
  247. Korg M50 Keyboard
  248. Fender Stage 160DSP - Help needed for replacement parts
  249. Can a Traynor YBA-1A with KT-88ís be increased beyond 50W/8 ohms?
  250. EH English Muff'n torroidal power trans