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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Fender Twin 135 Watt
  2. Traynor YBA-1 oscillating!
  3. Info about 12AT7 tube
  4. Peavey 5150 combo won't switch channels
  5. Who makes this fitted grommet for tube hold-down clamp opening?
  6. Carvin X-60 channel switching issue.
  7. Traynor YGL-1
  8. EL84 tube clamp, in a pinch......
  9. Drain Caps on valve king 212 (same as valveking 100 head).
  10. Going Pro...M.I. Amp repair
  11. Question for those who have stared at a scope screen for decades
  12. TFL5005D: carbon between contacts on solder side of output tube socket?
  13. Champ 600 with MM upgrade kit
  14. I'm a commercial jet engine technician.....but
  15. dearmond silver foil pickup help for rescue! reposted from gtr tech forum.
  16. trouble uploading my 3, 125kb pictures to this forum
  17. DC at output of GK 700RB II amp
  18. fender princeton chorus (1988)
  19. Ground like hum on 1968 Bassman
  20. Hot Rod Mayhem!!!
  21. Duf Two Stroke amp
  22. Fender HRDx Effects Loop Question
  23. Ampeg SVT 4 Pro 10V dc offset
  24. Silvertone 1340. Broken, Lost and Confused
  25. Line6 Spider 4 150 with sound issued... No clean settings
  26. fender 212r output stage issue
  27. VOX ac 30
  28. UL Vibrosonic (Twin Reverb) Phase Inverter question
  29. Behringer only hums in church
  30. Crate BT50
  31. noisy tube issues
  32. Roland KC-350
  33. Ampeg SVT II (SLM) Gnarly Hum
  34. 5f1: Transformer swap. Questions on voltages
  35. loudspeaker parts
  36. Marshall JCM900 Channel Switching & Pedal Wiring
  37. Gibsonette: Field Coil speaker question
  38. Fender Blues Jr.....
  39. fender bassman 200
  40. fender stage se112 - warble at low volume
  41. Fender Acoustasonic Junior (pre DSP) - reverb hum
  42. peavey 5150 1st gen combo
  43. B52 212 - Are Bias Instructions the same as B52 100?
  44. Crate BV6212 Diode Shorting
  45. 50's Danelectro Tube Tremolo (Vibrato) circuits, Octal tube, which?
  46. Quick +/- rail voltage question
  47. Ampeg SVT 4-Pro repair help
  48. fender rhodes transistors
  49. Deville 410 noise
  50. Fender FM 212R SS Amp Vol cut
  51. Popping at startup?
  52. Laney vc15 PT failure
  53. Ampeg SVT 350H: Troubleshooting/repairs
  54. Power supply transformer 26-0057-A for a Digitech VTP-1 Dual Channel Tube Preamp?
  55. Problem with a Peavey 6506
  56. Fender performer 1000 (PR209) broken reverberation unit
  57. Fender HD deville no sound in drive channels
  58. RF Mystery. My Supro is picking up radio stations. Need help..
  59. Gibson Skylark GA-5T Repair
  60. Brown Face Fender Bassman Approximate age?
  61. Gallien Krueger MB150e 112
  62. Sunn Solos schem?
  63. The Bucking Transformer
  64. Marshall JCM 2000 Preventative Maintenance issues
  65. Burman 501 combo blows fuse
  66. Silvertone 1474 Chassis Question
  67. Peavey SP-2G
  68. Mesa Triple Rectifier 3 Channel (2000 PCB) noise issue ? (Hum & Buzz)
  69. Crate VC5310 power tube failure ,and fuse blown.
  70. Marshall JCM800 2203 Blowing Mains Fuse
  71. Peavey PV2600 problem
  72. EQ slider question
  73. Trace Elliot RAH600SMX power amp fan speed
  74. Ampeg b200r rattling fix?
  75. Ampeg V3 voltages high
  76. Roland Cube 80XL question
  77. Fender Hot Rod Delxue channel switching issue
  78. Quieting a Polytone MB II hissing/mild crackling noise.
  79. JTM60 combo blowing filament fuse
  80. Musicmaster layout
  81. Peavey Ultra Plus "gotchas"
  82. Fender Stage 1000 footswitching problem
  83. Blues Jr. burned trace
  84. MusicMan HD130 combo transistor driver oscillation
  85. bias adjustment ?
  86. SWR SM 900 -15v rail trouble.
  87. hit the jackpot...I think
  88. What is considered a "professional" PCB trace repair?
  89. 1966 Gibson GA20-RVT Reverb
  90. Bias Problems in a New Build
  91. Bugera 1960 Bad Distortion When I Play Hard
  92. Crate V18 SMPS blowed up good...any solution?
  93. Fender Stage100 combo, reverb problem, can someone please help ?
  94. Of course I plugged it in. Do you think I'm stupid?
  95. Ampeg VT-40 Red Plating
  96. Fender HR Deville delayed channel switching
  97. 1975 Eventide Instant Flanger
  98. Maxi Mouse lectrosonic charging problems
  99. Mesa Single Rectifier Solo 50 - Blowing Fuses even without valves
  100. 1970's Orange OR120 Screen Resistor Value
  101. De-Soldering Lead-Free Solder PCB joints
  102. Mesa 3 ch DR clean channel squeal
  103. Carvin Pro Bass 100 Questions
  104. Sound City 50+ Reverb
  105. Anyone know the right tubes for this? Wabash Deluxe / Danelectro
  106. deluxe reverb noise problem?
  107. A personal first, I repaired a vintage tube
  108. Fender HRD
  109. Ampeg cracks me up
  110. How to ID an output transformer
  111. peavey pv500 power trip
  112. Fender Ultimate Chorus power amp repair
  113. Ashdown Mag 300 EVO II help needed.
  114. FX loop oscillates
  115. TC Electronics BG250 bass combo
  116. Yorkville E215 cabinet
  117. Mesa Mark III purple stripe Humming.
  118. Marshall JCM 900 fried! Need help :)
  119. Crate CA120DG Durango power amp problem
  120. Gallien-Kruger 400RB 2x10 combo problem, no signal to speakers.
  121. Peavey KB300 pots
  122. Traynor YBA-1A
  123. Gibson GA-79RV Troubles
  124. Gretsch Chet Atkins Country Gentleman 6160 combo amp bright switch problem
  125. Ampeg SVT-3pro help
  126. Behringer GMX input PC board rebuild?
  127. Sound City 120MK4 Bias mod, a slight return
  128. Amp Head blowing fuses
  129. Peavey VK100 no power to tubes!
  130. mesa express 5:50 contour circuit does not work there is no resistance in PCB !!!!!
  131. Seeking advice on Vox VT20+ 120 hz Buzz
  132. Dumbassbob 63 Bandmaster Crackling on Normal Channel
  133. Studiomaster 708 powered mixer amp fault
  134. Tone Control Stack Frequency Response for Traynor YBA-1A Mk II
  135. Yamaha EMX212s shutting down
  136. No bias current reading ?
  137. Hughes and Kettner TubeMeister 36
  138. Vox VT40+ hum issues
  139. SWR workingman's 12 - blows main fuse
  140. Peavey XR600 output and parts Question
  141. SWR SM400 bass amp problem
  142. Blackstar HT soloist 60 out of bias range
  143. vox ac50
  144. Oddball Roland JC-120 Jazz Chorus schematic needed
  145. Guild 98RT: Trem circtuit not working
  146. Stuck With a Vintage Blackface Fender Pro Reverb Repair
  147. Jcm 2000 tsl 100
  148. Trace Elliot GP7 300 Watt version bipolar bear question
  149. VHT Special 12/20RT low preamp voltages
  150. LTPI with CF stage---Fender Studio Bass Amp Output Stage
  151. Peavey TNT100 no output
  152. Fender Studio Bass Amp (EQ inductors?)
  153. Peavey Musician Mark III
  154. Fender Prosonic, Weak bass
  155. Ampeg BA115HPT distortion help
  156. Bugera 333xl no sound on the crunch channel !
  157. Looking for info on Hammond 1618 OT
  158. loud hum in Carte Palomino V16
  159. Bogner Shiva
  160. ID this connector?
  161. Silvertone 1482 Can Capacitor
  162. Radiohm Pot Disassembly, cleaning & reassembly on Allen & Heath Mod 3 Channel Strip
  163. '62 Guild 98RT: need a little help
  164. Kustom 36' Coupe not working
  165. Frontman 212R Hum
  166. Peavey Classic 50
  167. Peavey XR600B loud hum
  168. Sub For FR207 Diode?
  169. Need Help w/ Ampeg BA210SP - blows the fuse, the output is bad
  170. Marshall Valvestate 8100
  171. TDA2006H equivalent
  172. Original JTM45 re-cap & re-tube
  173. Ampeg V-4 arcing?
  174. Acoustic model 450 repair blog
  175. Ampeg SVT CL
  176. Replacement transistors for Marshall 5210?
  177. Gibson Falcon RVT-19
  178. Replacing diodes in rectifier
  179. Mackie HR824 trouble
  180. Metal Gurus?
  181. '70 Twin Reverb - No Vibrato
  182. Behringer V-Tone GMX210 - connector thread broken
  183. 120hz buzz, something fried?
  184. Ibanez TSA15H tubescreamer not working
  185. Ampeg B15NC bias issue?
  186. Roland Cube-40 (Orange) - Does anyone have one?
  187. Boom!
  188. Orange OR100 channel switching issue
  189. What is the supply HT on an orange bass terror
  190. Allen and Heath Mix Wizard 3...14...4...2
  191. Music Man 6L6 or EL34 ?
  192. 1965 Vox Cambridge Reverb footswitch problem
  193. 12" Polytone guitar amp repair?
  194. SState Marshall 5212 Hiss/static after warm-up
  195. Vox Repair PCB in test
  196. PC-based scopes, anyone found a good one for <1000v and audio?
  197. Peavey Musician Mark III...No +15V
  198. Korg M50 Keyboard
  199. Fender Stage 160DSP - Help needed for replacement parts
  200. Can a Traynor YBA-1A with KT-88ís be increased beyond 50W/8 ohms?
  201. EH English Muff'n torroidal power trans
  202. Silverface Champ LOUD Hum/Buzz
  203. Sano 250R bad pots?
  204. Blackface Deluxe (non-verb) problem
  205. Ampeg B200R Blowing fuses
  206. Marshall JMP 100w fuse questions
  207. Acoustic 470 channel switching noise
  208. Why is the input cap value to PI stages much lower than the FB input?
  209. Peavey Citation Transformer
  210. Fender Twin 135 Watt
  211. Laney nexus 400 watt tube bass amp
  212. Jcm 800 boost channel not switching....
  213. Traynor YBA-1A OT Protection-those old GE parts are Selenium!
  214. Crate PA6fx schem?
  215. Mesa maverick optocoupler issue
  216. Traynor YBA-1A no bias voltage @ Standby (no bias tap on PT)
  217. Is my OT fried?
  218. Univox Oscillation, bias runaway
  219. How to leave my '72 Bassman ?
  220. Fender Deluxe 90 DSP Intermittent Problem
  221. Les Paul supreme wiring problem
  222. 2007 Vox AC30HH random crackle when shutting off
  223. Blues jr III plate V issue
  224. Tube amp Crackle-like distortion
  225. Filter Caps replacement. Which is the best solution?
  226. Having trouble with high voltage fuses on Laney chassis rebuild
  227. Busted XR-1200?
  228. Speaker Testing Suggestions?
  229. BF Bassman hiss
  230. Why go all PDF links give me...
  231. 2n3055 vs MJ15003 any recent opinions?
  232. Bose SP1
  233. Arcing between adjacent tube pins on Ceramic tube sockets
  234. JCM 2000 TSL 100 motherboard question
  235. Ampeg Gemini II 2 - 7591 tubes red plating and what not
  236. Looking For Egnater Tweaker 15 PT Specs
  237. Carvin x100b... when it rains it pours!
  238. Traynor 70's vintage YBA-1A Mk II with KT-88's
  239. Fender Hot Rod Deluxe - Smorgasbord
  240. Acoustic 370 output power vs 470
  241. Sunn beta bass- oscillating output
  242. Orange or120 glow screen grid
  243. PI changes in blackface to silverface Deluxe Reverb
  244. Marshall JMP 50 breaking into oscillation when input level raised
  245. Laney VC30-112 Combo - hum problem
  246. Marshall 1987x Hiss
  247. Vox Viscount Repair/Refurb
  248. Electro Harmonix Memory Man Deluxe (4 control unit)
  249. Fender Super Sonic Twin automatic bias failure
  250. Behringer PMP960M Mixer/Poweramp