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View Full Version : Maintenance, Troubleshooting & Repair



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  1. Carlsbro Viper 100 Bass Amp
  2. What brand of Solder and heatsink grease do you buy?
  3. Ashdown MAG 250 - blowing fuses
  4. cheap speakers
  5. odd turn off noise - Fender Princeton Chorus - links to Youtube
  6. Low freq. excess in Fender Frontman 25r
  7. How do I connect a variac?
  8. Output tranny ID please
  9. Safety: testing Electrical outlets
  10. General question concerning reel to reels
  11. GT120 project that needs a helping hand
  12. Fixed ticking vibrato in 71 Deluxe Reverb using old tube
  13. Marhsall 1962 Bluesbreaker reissue - low power problem
  14. Orange Thunderverb 200 bias current
  15. Can one bypass a PS choke for the purpose of troubleshooting?
  16. Marshall MG15 Hums on Gain Channel
  17. Fender Super 210 Red Knob - Channel Switching Problem
  18. Univox U1011: couple questions
  19. Help with Envoy 110 please!
  20. vt60 making noise
  21. Farfisa TR-70 OS high pitch problem
  22. SWR 750 blowing output transistors
  23. behringer GMX212 footswitch issue
  24. Valve Jr Fried?
  25. Did I Kill the DC Regulated Power Supply?
  26. Problem with microphonic tubes that are brand new.
  27. Fender Twin & Deluxe Reverb Input Jacks....horrible part!
  28. Merry Christmas
  29. Metty Christmas
  30. Valvestate output boards
  31. Ibanez Thermion
  32. Marshall DSL401 - no FX loop
  33. Crate VC-3112 Re-Cap Question
  34. Marshall 6100 all levels "slow" starup
  35. Blues deluxe--issues
  36. Fender Frontman 212R Distortion
  37. B-52 ATX100 Transformer
  38. Kustom K100-2 Pre-amp transistors
  39. I hate keyboards
  40. Help with Sound City B150 feedback circuit
  41. Fender Princeton '65 Bias (?) Problem
  42. JCM 600 wackiness...??
  43. PCB Trace width on Power Circuits in Ampeg SVT VR & CL amps
  44. SWR 400 Strange Humming/cutting out
  45. Marshall amp hum
  46. Tube socket wiring diagram
  47. Ampeg BT 15 bias transistor
  48. Bugera 1990 Channel Switching Problem
  49. kam kk400 amplifier..
  50. Fender Hot Rod Deluxe : instability when in More Drive mode
  51. Mesa Transatlantic
  52. Roland KC 60 amp
  53. Behringer GMX 212 Help
  54. SVT-CL - Ticking
  55. 7581 Tubes
  56. Behringer BX3000T Schematic?
  57. Traynor YBA-3 - not very loud, bias testing
  58. Peavey Classic 30 Not Switching Channels
  59. Roland Jazz Chorus JC-120
  60. Engl E530 Gain pot problem
  61. Mesa Mark 1 strange resistor lead
  62. Old Gibson Amp
  63. Teac A-3440 recorder
  64. This sounds dumb, but....need help identifying a resistor value.
  65. behringer pmp2000 blowing fuse
  66. Odd Distortion Noise
  67. Mesa Dual Recfifier 3-Ch Solo Head, Ch 1 Oacillation problems
  68. Snap or pop followed by momentary loss of volume
  69. Ampeg B-100 problems
  70. Mesa Dual Rectifier 3-Ch Solo wth LF oscillation from 5U4GB's (SS Mode)
  71. TOA D3 Mixer - "Clip" lights stuck on
  72. Why do some Fender Amps pop and others don't during Standby switching?
  73. Hoffman DR AB763 : Low b+, no sound, loud hum, etc...
  74. Another Hot Rod Deluxe Oscillation distortion
  75. Marshall JCM2000 DSL 401 Volume Problem
  76. Mesa Subway Rocket Low Volume
  77. Bassman Plate Voltages
  78. Mesa Boogie F100 Output Issue
  79. Trace Elliot BLX80...issues :(
  80. Silly Fender Schematic Question
  81. Johnson Millennium 150 and computerized amp thoughts
  82. Sovek Mig 50 making static noise
  83. Randall RG200 help, please
  84. Fender Pro Reverb, Reverb hum and hiss (Pro Tube Series 2001)
  85. Marshall encoder
  86. Super Reverb- reverb hum
  87. Variation of Fender ticking Tremolo suppression
  88. Metroamp 50w kit - problem
  89. Marshall JCM2000. Will a TSL board work in a DSL.
  90. Legend A30 Output section problem
  91. 3 prong on ancient record player?
  92. Axial Lead Electrolytics
  93. Bad Hot Rod Deluxe output trans?
  94. Will Fender LDR Optocoupler Work in Magnatone Amp?
  95. What is the weirdest repair you had to do
  96. Kustom Quad 200HD
  97. A few questions about Carbon Comp (R)
  98. Fender automatic bias
  99. Ampeg B200R Bass Amp
  100. Mesa Blue Angel slightly down on power
  101. Quick question about virtual heater CT
  102. Ampeg SVT-CL Direct Out broken/Noise off standby
  103. Sunn Solos 2 solid state
  104. Twin Reverb crackling/static noise help
  105. Hartke HA 5500 switches off
  106. Hot Rod Deluxe - Help diagnosing problem would be much appreciated
  107. Odd field coil circuit
  108. crackling in amp?
  109. Fender BF 1965 Super Reverb Buzz (with no tubes installed)
  110. How do your remove screws that have thread lock compound applied?
  111. Fender PA100
  112. Transformers; identifying which turn is shoted
  113. Gibson GA 8 Gibsonette oscillation/squeal
  114. Line 6 Spider HD100 MkII
  115. On Semi EOL notice
  116. Old Acoustic Control 370 issues
  117. Early Ampeg V4: breaks up around 3 and now won't turn on
  118. Orange AD30TC - Weird "Ghost Notes"
  119. What power transformer do I need?
  120. Fender Hot Rod Deluxe - Fuse type fast or slow
  121. Layout file for GK 800RB power board??
  122. New Ampeg SVT Heritage amp, Fault Light flashing
  123. Need some help in the UK. Near'ish south of London!
  124. Fender Hot Rod Deluxe Blown rectifier diode and resistor on output tube
  125. Rivera Chubster 40 Blowing F1 Fuse
  126. '78 yba-1 traynor voltages?
  127. SVT Dies on the Bench
  128. Marshall Vavlestate 2000 AVT100 Static Discharge Damage
  129. Orange tranny color codes?
  130. Cyclic Hum....sounds like 'naaahhhhh-ummmmmm......naaahhhhhh-ummmmmmm, 2 sec rep rate
  131. Magnatone 107 / How do I make this 'widowmaker' safe? continued
  132. 60 Hz Quest
  133. Marshall JCM 800 Original Classic 2204S Limited Edition (50 watt small box head)
  134. Ampeg G15 (Gemini 2 with 6L6 power tubes)
  135. Ampeg VH-140C Volume cutting out / can't find any solutions
  136. No Tremolo ?
  137. Marshall JCM2000 DSL bias too hot.
  138. CRATE GX140C- No Channel or Gain Switching
  139. Fender Super 112 - Low Output
  140. OT for Traynor YCV40
  141. Speaking of Hiwatt's hum
  142. ashdown fallen angel 40watt combo buzzing and hissing???
  143. 'New' Bias supply not working..
  144. 6550 power tube current distribution in Ampeg SVT-AV/CL @ 50, 100, 200W/4 Ohm
  145. Gabby enterprises Fake Fender Showman project
  146. GK 400RB Distorted Output
  147. Should one fit R1 to a Marshall DSL 100 preamp is 3
  148. vintage Marshall 2203 HELP its been modded...redplating all 4 tubes
  149. Look what I found!
  150. Traynor YBA-1 Tube Voltage Issues
  151. Need help trouble shooting MOD 102 amp kit.
  152. Carlsbro GLX100 Reverb tank
  153. Traynor ycv40 low output
  154. Help my amp melted down!
  155. Hiwatt Custom 50 Biacrown era Loud Scratchy Master Volume..Help
  156. Mesa Boogie Dual rectifier solo head channel s/w noise
  157. Tremolo apparently on, but not in the speaker
  158. Moving right along to a charming Denon 650f
  159. question about running your own shop
  160. Fender 112 se
  161. Sound City B 150-why is this cap here?
  162. Fender Acoustasonic - Low Volume On One Speaker
  163. Polytone mini-brute has poor sound.
  164. Hum in a Gibson GA8T
  165. How hot should an EL84 run in a class A?
  166. Volume on Normal Channel Control?
  167. Ashdown MAG300, can't get the DC off the output
  168. Acoustic 125 Mystery Bodge
  169. Peavey triumph 120 blows fuse F5A on power up....??
  170. blocking Distortion? 5C3+5c1 custom amp
  171. notices
  172. Reverb Tank for marshall JCM800 ?
  173. CRATE V18
  174. Need help Bugera 6260 head hum problem
  175. Mesa/Boogie Dual Rectifier problems after power surge
  176. Peavey Mega Bass SS Rackmount - Low Output
  177. Peavey Envoy issues
  178. Reverb problem, Fender Stage 100, again...
  179. Melody HiFi problems
  180. Return of G K 400 RB.
  181. Laney AOR help
  182. Fender Bassman 10 Repair/Restore
  183. Holland Amp: On board reverb drives a speaker directly?
  184. SVT lll pro fan again
  185. Gibson GA15RV no reverb
  186. On the look out for a tube tester!!
  187. 220v to 120v Transformer Conversion
  188. VCD leakage in bass amp?
  189. Peavey Mace VT Problems
  190. TSL100 signal passing at zero volume and gain
  191. ampeg svt 3 pro tube drive question
  192. Princeton chorus schematic?
  193. Thomas Vox Repair Boards Update
  194. Heathkit - power supply question (replacing diodes)
  195. Bugera 333xl switching problems.
  196. Power Transistor Help
  197. Fender Twin 135 Watt
  198. Traynor YBA-1 oscillating!
  199. Info about 12AT7 tube
  200. Peavey 5150 combo won't switch channels
  201. Who makes this fitted grommet for tube hold-down clamp opening?
  202. Carvin X-60 channel switching issue.
  203. Traynor YGL-1
  204. EL84 tube clamp, in a pinch......
  205. Drain Caps on valve king 212 (same as valveking 100 head).
  206. Going Pro...M.I. Amp repair
  207. Question for those who have stared at a scope screen for decades
  208. TFL5005D: carbon between contacts on solder side of output tube socket?
  209. Champ 600 with MM upgrade kit
  210. I'm a commercial jet engine technician.....but
  211. dearmond silver foil pickup help for rescue! reposted from gtr tech forum.
  212. trouble uploading my 3, 125kb pictures to this forum
  213. DC at output of GK 700RB II amp
  214. fender princeton chorus (1988)
  215. Ground like hum on 1968 Bassman
  216. Hot Rod Mayhem!!!
  217. Duf Two Stroke amp
  218. Fender HRDx Effects Loop Question
  219. Ampeg SVT 4 Pro 10V dc offset
  220. Silvertone 1340. Broken, Lost and Confused
  221. Line6 Spider 4 150 with sound issued... No clean settings
  222. fender 212r output stage issue
  223. VOX ac 30
  224. UL Vibrosonic (Twin Reverb) Phase Inverter question
  225. Behringer only hums in church
  226. Crate BT50
  227. noisy tube issues
  228. Roland KC-350
  229. Ampeg SVT II (SLM) Gnarly Hum
  230. 5f1: Transformer swap. Questions on voltages
  231. loudspeaker parts
  232. Marshall JCM900 Channel Switching & Pedal Wiring
  233. Gibsonette: Field Coil speaker question
  234. Fender Blues Jr.....
  235. fender bassman 200
  236. fender stage se112 - warble at low volume
  237. Fender Acoustasonic Junior (pre DSP) - reverb hum
  238. peavey 5150 1st gen combo
  239. B52 212 - Are Bias Instructions the same as B52 100?
  240. Crate BV6212 Diode Shorting
  241. 50's Danelectro Tube Tremolo (Vibrato) circuits, Octal tube, which?
  242. Quick +/- rail voltage question
  243. Ampeg SVT 4-Pro repair help
  244. fender rhodes transistors
  245. Deville 410 noise
  246. Fender FM 212R SS Amp Vol cut
  247. Popping at startup?
  248. Laney vc15 PT failure
  249. Ampeg SVT 350H: Troubleshooting/repairs
  250. Power supply transformer 26-0057-A for a Digitech VTP-1 Dual Channel Tube Preamp?