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View Full Version : Amps/Cabs Tech Corner: Amplifier, Cab & Speakers Tech Discussions


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  1. Dave Hunter Guitar Amp Handbook
  2. Request: Schematic for Marshall Haze combo anyone?
  3. Filter caps question for 73 Super Reverb
  4. Mods??? Mixing Different Power Tubes Together
  5. Got "bit" by an amp for the first time tonight....
  6. volume pot for Fender pro junior
  7. Speaker wire size for Marshall 1960ax 4x12 cab? Confused????
  8. Where Can I get Old Fender (1960's) Tube Charts? or Images of Tube Charts?
  9. Advice needed...adding LED in channel switch
  10. Traynor YCV40 Crackle - help?
  11. Possible pawn shop find, advise needed.
  12. Crazy Built-In Browner Question
  13. I just fried my Bedrock- argh
  14. *&^%$#@! used tubes just fried an amp
  15. new tubes for SF Princeton 'verb
  16. matching power tubes
  17. Resistors Question???
  18. Amp oscillation help - Found bad ground
  19. amps that allow tube mixing
  20. bias circuit question
  21. Which Tweed Champ impedance?
  22. Need help from Husky (Suhr)
  23. Bulb for Heathkit Model TC-1 Tube Checker?
  24. do you know this circuit?
  25. Silvertone 1331 - transformer replacement?
  26. Princeton drive
  27. Princeton Reissue Question-tubes
  28. '64 Super Reverb blowing fuses
  29. Marshall 1987x input?
  30. Adding an extension cab to a Fender HR Deluxe
  31. Mig-50 Repairs
  32. Tweed Deluxe Owners - Help On Combo Cab Size. Please
  33. Instrument cable vs speaker cable...
  34. how hard of a job is switching out transformers?
  35. Removing paint from cabinet
  36. Sovtek Mig 50 PT
  37. Rusty Transformer
  38. Does a mod to a Korg era AC30 make a difference?
  39. Marshall JMP 2203/04 6550 to EL34 Conversion
  40. Help me hook up my attenuator to my AC30!
  41. Stuff you slap on tubes pins????
  42. Phase inverter Q for anyone willing to educate me
  43. Hakko 936 Handle Size
  44. 5F1 Bias Resistor Voltage Question
  45. tube rectifier in a bassman
  46. Kitty Hawk schematic??
  47. Are Speaker Ohms Relational To Sensitivity?
  48. Contact info. for Jeff Bober @ Precision Audio Tailoring?
  49. When did Mallory 150's change color?
  50. Where to find film caps under 1000pf???
  51. want to mod my 5f1
  52. Fender Vibrolux reverb
  53. 6v6 vrs. 6l6, sound differances ?
  54. What changes do I need to do to switch from 6v6s to 6l6s in a 5e3 Deluxe Clone
  55. Tweed Deluxe: max clean output 9watts?
  56. DC in NFB
  57. crystal lattice-tubes?!?!?! Is this real?
  58. Need Help with blowing fuses
  59. JJ 12AX7: Reliability Problems?
  60. Deluxe Reverb Hoffman Conversions - Thoughts?
  61. 6CA7 to EL34
  62. Supro 1290T Question
  63. Amp techs in Atlanta?
  64. Why All The Noise??
  65. took in a stray today
  66. should i get groovetubes? NEED HELP QUICKLY!
  67. Is there a "quietest" 12ax7?
  68. Sizzle/Frying sound
  69. Pro Reverb circuit
  70. 69' Vibrolux - Bias BF/SF Q's
  71. How to fix lifeless reverb
  72. Popping from PRRI
  73. Sonic M1A
  74. How Would One Track Down Where Ghosting Is Coming From?
  75. Cool tool alert!!
  76. Amp feedback, need help please!
  77. 6L6s in a Deluxe Reverb... what issues?
  78. Which 6L6?
  79. NOS 5Y3 in a Swart STR
  80. Good tech in Ft. Lauderdale?
  81. Hartke 5500 Bass Head Blows Fuse
  82. Reverb wires and jacks vs. sockets ?
  83. Matched tubes?
  84. Filament wiring on Twin Reverbs
  85. Loud crackling sound then fuse blows...3rd time. Halp!
  86. '52 Bassman versus '46 Professional
  87. bassman vs bassman 50
  88. New Production Mullards
  89. Amp problem - intermittent crackle noise
  90. Fender Tonemaster: upgrading caps - ?
  91. Speaker Ohm question
  92. "Lay down" PT mounting ?
  93. Channel switching pop source?
  94. hi res schematic and layouts
  95. EL34s in a 5150?
  96. basic info on all power tube bias voltages
  97. Odd/conflicting values on DR AB763 circuit?
  98. Impedence mismatch: the lesser of two evils?
  99. Got a tube testing question.
  100. Will NOS tubes make any significant difference in a stock Marshall DSL 50?
  101. Need help converting SF Deluxe to Pro Reverb specs
  102. Twin Reverb- Reverb not working. Any tips?
  103. reducing power of Blackface Twin by removing tubes????
  104. Speaker replacement: Female Spade Connectors?
  105. 2x12 cab ohm question
  106. 4n7 conversion?
  107. Ampeg VT40 question or two
  108. Help with AB763 Deluxe Reverb Schematic Mods
  109. Which KT66?
  110. 2x6V6 (~20w) Plexi Schematic?
  111. Twin Reverb Reissue Vibrato problem
  112. question on using diff trannys with same tube
  113. Grid stoppers, clamping, blocking and crossover distortion.
  114. bias rite arrived gonna give it a crack... any advice before i jump in..?
  115. Egnater Rebel 20 Head - Loop Question
  116. What does 5e3 mean?
  117. Please help Identify 2 older 12AX7's
  118. Amp powering down on me- help!
  119. in the place of a choke
  120. Please Help! Water in Speaker
  121. Minimum baffle thickness for a EVM12L?
  122. pulling tubes from a blues deluxe
  123. Need info on pulling tube from 57 twin RI
  124. First Time Amp Building ideas?
  125. Output transformer tolerances?
  126. amp just lost sound - troubleshooting
  127. No grounded outlets in practice space- Electrician advice requested
  128. Oh crap: Hot Rod Deluxe static (not tubes)
  129. Is a hot power transformer a bad sign?
  130. Difference between Front & Rear-Loaded speakers?
  131. Tube layout for a Divided by 13 SJT 10/20???
  132. Marshall 5002 Lead 20 Gut Pic !! - Mod Advice -
  133. My amp quit last night, any ideas??
  134. 1956 Bassman - Question
  135. 7819 Power Tubes
  136. Fender Mods Gone Bad
  137. got a used Richter- Got a HUM
  138. Help: White noise from my fuchs!!!
  139. Rivera M100 footswitch question. FS-5?
  140. Source for 500K linear D-shaft pot?
  141. Modding a Bassman 10
  142. Deluxe Reverb tube socket question
  143. 18watt.com question
  144. Ampeg V4 running very hot
  145. Power tubes surging
  146. Super Champ reverb mod?
  147. Champ 600 trouble...
  148. Tremolux head - advise please...
  149. 12ax7 to swap with 12at7
  150. Ran 18w without rectifier for a few minutes...
  151. How do you cut the bright cap on a 72' Deluxe Reverb ?
  152. Baldwin 12ax7a blackplate:Sylvania's?
  153. Eminence Blue Frame mechanical buzz from magnet cover
  154. How to drain filter caps in a 72 Fender DR ?
  155. Stay or go: 1-ohm cathode resistors
  156. Tolerance of 450v filter cap
  157. Can anyone identify this 72 Deluxe Reverb mod?
  158. Anybody familiar with old Tesla (not JJ) E34L's?
  159. Tube Layout on Vox AC15H1TV
  160. Specific 6L6GC needed for Mesa amps (DC-5)?
  161. Deleuxe Reverb Transformers - MM, Heyboer etc
  162. ANyone familiar with the Belton Digi-Log reverb modules?
  163. Linked inputs... so nice. Is there a risk?
  164. is there a way to test Tubes without a tube tester?
  165. intermittent hum... what could cause this?
  166. Don't tell me I just shot my PT...
  167. Input jack replacement....
  168. amazing tube making video
  169. could use some help (spitfire build)
  170. EF86- 2 Channel or Channel Switching?
  171. Identify These 12ax7s
  172. Microphonic Bandmaster
  173. Supro Thunderbolt Ghost Notes, possible bad cap job
  174. shielding on fender amps?
  175. Bad 6v6 power tube in Super Champ XD. Suggestions/Comments?
  176. biasing a guytron gt 100 rev b
  177. Ampeg Gemini I (gut shots)
  178. Need advice on replacing tubes in 68 Bassman
  179. Need Help
  180. fender blues jr into 18 watt lite IIb help needed
  181. Pre amp tube broken leg
  182. can capacitor preferences?
  183. Lectrolab R700c bass amp schematic?
  184. Stupid speaker question....
  185. Is a g12H30 considered a greenback type speaker?
  186. Amp eats output valves for breakfast
  187. Plexi clone B+ question
  188. fixing the balance pot
  189. Did I Almost Electrocute Myself?
  190. How do different ohms effect an amp??
  191. Help me gain more knowledge..
  192. Red Plating E34L Tube- Any Ideas??
  193. Q regarding different primary loads on Fender OT's
  194. A definition of "AC" in amp/guitar signal
  195. intermitting problem with Fender amp
  196. Why Do Amp Makers Still Use Fiberboard?
  197. Silvertone 1434 "Medalist" help
  198. Replacement speaker advice needed
  199. difference in tubes
  200. 4 x 6L6 in a M/B MkIII?
  201. HELP!! JTM60 combo distorting
  202. Help with choosing 12ax7's
  203. Will disconnecting one speaker from a 2x12 4ohm cab change the ohms?
  204. Question about biasing an amp (shunt method)
  205. 12AX7,12AT7 and 12AU7 can I use all? in Dr.Z
  206. Pro Reverb Vibrato Help
  207. where to buy tube retainers?
  208. Need power tube break up at reasonable volume, would a speaker change help?
  209. buzzing amp question
  210. Fried valve
  211. Two Stroke Help!!
  212. How to add variable gain to a 2 stroke?
  213. Tube recommendations for Ceriatone DC-30
  214. bassman 10 project OT issue, HELP!
  215. no sound at all from a JCM800
  216. 72 vibrolux extension cabinet? ohms?
  217. Alnico Blues
  218. Fender Layouts X Y & B+ ?
  219. Question about draining voltage from caps?
  220. New hum with previously quiet amp.
  221. NOS or ANOS, What's the diffrence ? Help.
  222. Can a keyboard line out be run into guitar amp input?
  223. Will an OT still work if it's bad?
  224. Is anyone experimenting with..
  225. Vox AC30tbx Mod/ signal path resistors?
  226. ss amp(blown fuse)
  227. VOX AC15CC Blowing Fuses - Help!
  228. New Dr. Z amp: 40 Watter With One 30 watt Speaker?
  229. Two Rock!!!
  230. Problem with an old EL84 powered stereo hi/fi
  231. Princeton Reverb = Thin/Plucky?
  232. voltage/hum problem with '64 Deluxe non-reverb
  233. Anybody have a schematic for a PPIMV mod?
  234. Standby switch stopped working
  235. AA864/5F6-A hybrid
  236. gibson amp tech needed and speaker advice!
  237. 1/2 watt or 1 watt resistors for twin reverb?
  238. which rectifier for 5e8a
  239. if the silver stuff inthe tube turns white and flakes off, it's dead, right?
  240. can speakers just die?
  241. Troubleshooting Help - HR Deluxe Has No Power
  242. Can someone point me to a schematic for a voltage limiter using a light bulb?
  243. Inserting a tube the wrong way....
  244. Amp noise
  245. International PT Hook-Up Q
  246. White noise from my fuchs: Continued
  247. Sovtek Mig 100 question
  248. Bogner Shiva Problem
  249. Vibro Champ - kinda muddy
  250. If tubes are going bad, what will they show on my voltometer?