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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Ampeg B-100 problems
  2. Mesa Dual Rectifier 3-Ch Solo wth LF oscillation from 5U4GB's (SS Mode)
  3. TOA D3 Mixer - "Clip" lights stuck on
  4. Why do some Fender Amps pop and others don't during Standby switching?
  5. Hoffman DR AB763 : Low b+, no sound, loud hum, etc...
  6. Another Hot Rod Deluxe Oscillation distortion
  7. Marshall JCM2000 DSL 401 Volume Problem
  8. Mesa Subway Rocket Low Volume
  9. Bassman Plate Voltages
  10. Mesa Boogie F100 Output Issue
  11. Trace Elliot BLX80...issues :(
  12. Silly Fender Schematic Question
  13. Johnson Millennium 150 and computerized amp thoughts
  14. Sovek Mig 50 making static noise
  15. Randall RG200 help, please
  16. Fender Pro Reverb, Reverb hum and hiss (Pro Tube Series 2001)
  17. Marshall encoder
  18. Super Reverb- reverb hum
  19. Variation of Fender ticking Tremolo suppression
  20. Metroamp 50w kit - problem
  21. Marshall JCM2000. Will a TSL board work in a DSL.
  22. Legend A30 Output section problem
  23. 3 prong on ancient record player?
  24. Axial Lead Electrolytics
  25. Bad Hot Rod Deluxe output trans?
  26. Will Fender LDR Optocoupler Work in Magnatone Amp?
  27. What is the weirdest repair you had to do
  28. Kustom Quad 200HD
  29. A few questions about Carbon Comp (R)
  30. Fender automatic bias
  31. Ampeg B200R Bass Amp
  32. Mesa Blue Angel slightly down on power
  33. Quick question about virtual heater CT
  34. Ampeg SVT-CL Direct Out broken/Noise off standby
  35. Sunn Solos 2 solid state
  36. Twin Reverb crackling/static noise help
  37. Hartke HA 5500 switches off
  38. Hot Rod Deluxe - Help diagnosing problem would be much appreciated
  39. Odd field coil circuit
  40. crackling in amp?
  41. Fender BF 1965 Super Reverb Buzz (with no tubes installed)
  42. How do your remove screws that have thread lock compound applied?
  43. Fender PA100
  44. Transformers; identifying which turn is shoted
  45. Gibson GA 8 Gibsonette oscillation/squeal
  46. Line 6 Spider HD100 MkII
  47. On Semi EOL notice
  48. Old Acoustic Control 370 issues
  49. Early Ampeg V4: breaks up around 3 and now won't turn on
  50. Orange AD30TC - Weird "Ghost Notes"
  51. What power transformer do I need?
  52. Fender Hot Rod Deluxe - Fuse type fast or slow
  53. Layout file for GK 800RB power board??
  54. New Ampeg SVT Heritage amp, Fault Light flashing
  55. Need some help in the UK. Near'ish south of London!
  56. Fender Hot Rod Deluxe Blown rectifier diode and resistor on output tube
  57. Rivera Chubster 40 Blowing F1 Fuse
  58. '78 yba-1 traynor voltages?
  59. SVT Dies on the Bench
  60. Marshall Vavlestate 2000 AVT100 Static Discharge Damage
  61. Orange tranny color codes?
  62. Cyclic Hum....sounds like 'naaahhhhh-ummmmmm......naaahhhhhh-ummmmmmm, 2 sec rep rate
  63. Magnatone 107 / How do I make this 'widowmaker' safe? continued
  64. 60 Hz Quest
  65. Marshall JCM 800 Original Classic 2204S Limited Edition (50 watt small box head)
  66. Ampeg G15 (Gemini 2 with 6L6 power tubes)
  67. Ampeg VH-140C Volume cutting out / can't find any solutions
  68. No Tremolo ?
  69. Marshall JCM2000 DSL bias too hot.
  70. CRATE GX140C- No Channel or Gain Switching
  71. Fender Super 112 - Low Output
  72. OT for Traynor YCV40
  73. Speaking of Hiwatt's hum
  74. ashdown fallen angel 40watt combo buzzing and hissing???
  75. 'New' Bias supply not working..
  76. 6550 power tube current distribution in Ampeg SVT-AV/CL @ 50, 100, 200W/4 Ohm
  77. Gabby enterprises Fake Fender Showman project
  78. GK 400RB Distorted Output
  79. Should one fit R1 to a Marshall DSL 100 preamp is 3
  80. vintage Marshall 2203 HELP its been modded...redplating all 4 tubes
  81. Look what I found!
  82. Traynor YBA-1 Tube Voltage Issues
  83. Need help trouble shooting MOD 102 amp kit.
  84. Carlsbro GLX100 Reverb tank
  85. Traynor ycv40 low output
  86. Help my amp melted down!
  87. Hiwatt Custom 50 Biacrown era Loud Scratchy Master Volume..Help
  88. Mesa Boogie Dual rectifier solo head channel s/w noise
  89. Tremolo apparently on, but not in the speaker
  90. Moving right along to a charming Denon 650f
  91. question about running your own shop
  92. Fender 112 se
  93. Sound City B 150-why is this cap here?
  94. Fender Acoustasonic - Low Volume On One Speaker
  95. Polytone mini-brute has poor sound.
  96. Hum in a Gibson GA8T
  97. How hot should an EL84 run in a class A?
  98. Volume on Normal Channel Control?
  99. Ashdown MAG300, can't get the DC off the output
  100. Acoustic 125 Mystery Bodge
  101. Peavey triumph 120 blows fuse F5A on power up....??
  102. blocking Distortion? 5C3+5c1 custom amp
  103. notices
  104. Reverb Tank for marshall JCM800 ?
  105. CRATE V18
  106. Need help Bugera 6260 head hum problem
  107. Mesa/Boogie Dual Rectifier problems after power surge
  108. Peavey Mega Bass SS Rackmount - Low Output
  109. Peavey Envoy issues
  110. Reverb problem, Fender Stage 100, again...
  111. Melody HiFi problems
  112. Return of G K 400 RB.
  113. Laney AOR help
  114. Fender Bassman 10 Repair/Restore
  115. Holland Amp: On board reverb drives a speaker directly?
  116. SVT lll pro fan again
  117. Gibson GA15RV no reverb
  118. On the look out for a tube tester!!
  119. 220v to 120v Transformer Conversion
  120. VCD leakage in bass amp?
  121. Peavey Mace VT Problems
  122. TSL100 signal passing at zero volume and gain
  123. ampeg svt 3 pro tube drive question
  124. Princeton chorus schematic?
  125. Thomas Vox Repair Boards Update
  126. Heathkit - power supply question (replacing diodes)
  127. Bugera 333xl switching problems.
  128. Power Transistor Help
  129. Fender Twin 135 Watt
  130. Traynor YBA-1 oscillating!
  131. Info about 12AT7 tube
  132. Peavey 5150 combo won't switch channels
  133. Who makes this fitted grommet for tube hold-down clamp opening?
  134. Carvin X-60 channel switching issue.
  135. Traynor YGL-1
  136. EL84 tube clamp, in a pinch......
  137. Drain Caps on valve king 212 (same as valveking 100 head).
  138. Going Pro...M.I. Amp repair
  139. Question for those who have stared at a scope screen for decades
  140. TFL5005D: carbon between contacts on solder side of output tube socket?
  141. Champ 600 with MM upgrade kit
  142. I'm a commercial jet engine technician.....but
  143. dearmond silver foil pickup help for rescue! reposted from gtr tech forum.
  144. trouble uploading my 3, 125kb pictures to this forum
  145. DC at output of GK 700RB II amp
  146. fender princeton chorus (1988)
  147. Ground like hum on 1968 Bassman
  148. Hot Rod Mayhem!!!
  149. Duf Two Stroke amp
  150. Fender HRDx Effects Loop Question
  151. Ampeg SVT 4 Pro 10V dc offset
  152. Silvertone 1340. Broken, Lost and Confused
  153. Line6 Spider 4 150 with sound issued... No clean settings
  154. fender 212r output stage issue
  155. VOX ac 30
  156. UL Vibrosonic (Twin Reverb) Phase Inverter question
  157. Behringer only hums in church
  158. Crate BT50
  159. noisy tube issues
  160. Roland KC-350
  161. Ampeg SVT II (SLM) Gnarly Hum
  162. 5f1: Transformer swap. Questions on voltages
  163. loudspeaker parts
  164. Marshall JCM900 Channel Switching & Pedal Wiring
  165. Gibsonette: Field Coil speaker question
  166. Fender Blues Jr.....
  167. fender bassman 200
  168. fender stage se112 - warble at low volume
  169. Fender Acoustasonic Junior (pre DSP) - reverb hum
  170. peavey 5150 1st gen combo
  171. B52 212 - Are Bias Instructions the same as B52 100?
  172. Crate BV6212 Diode Shorting
  173. 50's Danelectro Tube Tremolo (Vibrato) circuits, Octal tube, which?
  174. Quick +/- rail voltage question
  175. Ampeg SVT 4-Pro repair help
  176. fender rhodes transistors
  177. Deville 410 noise
  178. Fender FM 212R SS Amp Vol cut
  179. Popping at startup?
  180. Laney vc15 PT failure
  181. Ampeg SVT 350H: Troubleshooting/repairs
  182. Power supply transformer 26-0057-A for a Digitech VTP-1 Dual Channel Tube Preamp?
  183. Problem with a Peavey 6506
  184. Fender performer 1000 (PR209) broken reverberation unit
  185. Fender HD deville no sound in drive channels
  186. RF Mystery. My Supro is picking up radio stations. Need help..
  187. Gibson Skylark GA-5T Repair
  188. Brown Face Fender Bassman Approximate age?
  189. Gallien Krueger MB150e 112
  190. Sunn Solos schem?
  191. The Bucking Transformer
  192. Marshall JCM 2000 Preventative Maintenance issues
  193. Burman 501 combo blows fuse
  194. Silvertone 1474 Chassis Question
  195. Peavey SP-2G
  196. Mesa Triple Rectifier 3 Channel (2000 PCB) noise issue ? (Hum & Buzz)
  197. Crate VC5310 power tube failure ,and fuse blown.
  198. Marshall JCM800 2203 Blowing Mains Fuse
  199. Peavey PV2600 problem
  200. EQ slider question
  201. Trace Elliot RAH600SMX power amp fan speed
  202. Ampeg b200r rattling fix?
  203. Ampeg V3 voltages high
  204. Roland Cube 80XL question
  205. Fender Hot Rod Delxue channel switching issue
  206. Quieting a Polytone MB II hissing/mild crackling noise.
  207. JTM60 combo blowing filament fuse
  208. Musicmaster layout
  209. Peavey Ultra Plus "gotchas"
  210. Fender Stage 1000 footswitching problem
  211. Blues Jr. burned trace
  212. MusicMan HD130 combo transistor driver oscillation
  213. bias adjustment ?
  214. SWR SM 900 -15v rail trouble.
  215. hit the jackpot...I think
  216. What is considered a "professional" PCB trace repair?
  217. 1966 Gibson GA20-RVT Reverb
  218. Bias Problems in a New Build
  219. Bugera 1960 Bad Distortion When I Play Hard
  220. Crate V18 SMPS blowed up good...any solution?
  221. Fender Stage100 combo, reverb problem, can someone please help ?
  222. Of course I plugged it in. Do you think I'm stupid?
  223. Ampeg VT-40 Red Plating
  224. Fender HR Deville delayed channel switching
  225. 1975 Eventide Instant Flanger
  226. Maxi Mouse lectrosonic charging problems
  227. Mesa Single Rectifier Solo 50 - Blowing Fuses even without valves
  228. 1970's Orange OR120 Screen Resistor Value
  229. De-Soldering Lead-Free Solder PCB joints
  230. Mesa 3 ch DR clean channel squeal
  231. Carvin Pro Bass 100 Questions
  232. Sound City 50+ Reverb
  233. Anyone know the right tubes for this? Wabash Deluxe / Danelectro
  234. deluxe reverb noise problem?
  235. A personal first, I repaired a vintage tube
  236. Fender HRD
  237. Ampeg cracks me up
  238. How to ID an output transformer
  239. peavey pv500 power trip
  240. Fender Ultimate Chorus power amp repair
  241. Ashdown Mag 300 EVO II help needed.
  242. FX loop oscillates
  243. TC Electronics BG250 bass combo
  244. Yorkville E215 cabinet
  245. Mesa Mark III purple stripe Humming.
  246. Marshall JCM 900 fried! Need help :)
  247. Crate CA120DG Durango power amp problem
  248. Gallien-Kruger 400RB 2x10 combo problem, no signal to speakers.
  249. Peavey KB300 pots
  250. Traynor YBA-1A