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View Full Version : Amp Technical Info

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  1. Voltage/Bias & Amp Performance Questions
  2. Testing an unknown PT
  3. What the heck are these Marshall pre-amp tubes?
  4. 6SL7 in a Tweed Deluxe Clone?
  5. EL34's for a 520V (plate) amp?
  6. How to test a power cap?
  7. Jtm45
  8. NEED A QUICK TUTORIAL (Transformer content)
  9. Trace Velocette Arrived - with Problems.
  10. 5y3 to 5u4 swap?
  11. Vintage combo amps...new speaker cable
  12. Epiphone Galaxie 10 Project
  13. speaker wiring in a hurry...can I use E tape for tonight?
  14. NOS Valvo El84 Question
  15. Biasing a Traynor YBA-1A
  16. building a few things need help....
  17. Microphonic wires?
  18. Where can I find CASE PARTS?
  19. Tried The Jensen Neo !2"
  20. Any good reason not to get Radio Shack solder?
  21. Ampmaker OT01
  22. Repair/disassembly tricks?
  23. Which multimeter?
  24. Mains Fuses on amps 4-5 amp (Slow or fast blow?)
  25. Discharging the transformer or caps or... okay, technical help
  26. Auto biasing?
  27. Biasing a tweed tremolux 5E9
  28. Tube tester recommendations?
  29. Weird problem here......
  30. Question on using bias test points/adjustment
  31. Can someone ID this 12ax7a? thx.
  32. soldering a 1/4" switchcraft jack question
  33. Are bias resistors good enough?
  34. Patch tear in speaker?
  35. Radio signal when I ......
  36. Biasing Question RE: Vp & Ik relationship
  37. z28 bias?
  38. Vintage Amp/New Caps
  39. Selecting 7581A in the correct bias range for a Mesa/Boogie DC-5
  40. Are These Stock Jubilee (2204) Bias Readings Correct?
  41. amp building
  42. 1965 Gibson GR25rvt Hawk
  43. mounting reverb tank
  44. Fender amp parts question
  45. ARS Tubes?
  46. Can someone ID this =C= tube for me?
  47. Picking up radio stations/CB radios
  48. Slope resistor
  49. In any 4-power-tube situation, you can pull out the outer two
  50. speaker or instrument cable . .identifying
  51. Blackface Champ Chasis
  52. how to make a speaker cable?
  53. Feedback/Squeeling issues
  54. 1959slp bias question
  55. 2 amps and trying to avoid ground loops...
  56. Anyone have a problem with reliability on SED tubes?
  57. Deluxe Rev Bright cap question
  58. One Excellent Tube Dealer!!
  59. Clark 5F2? Is this a Clark Princeton or Champ?
  60. Faintly glowing plates on a new Super Lead build. What to do?
  61. Traynor Custom Reverb lack of headroom???
  62. Tweed Princeton ?
  63. how MUCH power?
  64. Same amp,same speakers 4x12 vs 1x12 which is louder...
  65. Speaker Solder
  66. Where Can I Get These In Bulk?
  67. 2 DR's in stereo
  68. Output transformer resistance
  69. Marshall Power brake??
  70. Power tubes shorting...help, anyone?
  71. Wattage question
  72. Amp Problem-Please Help
  73. Deluxe Reverb destined to hiss?
  74. Tube Idle Bias effect in Cathode & Fixed bias circuits?
  75. Anyone have any trouble with there Crate V series???
  76. Series or parallel, how do most cabs come?
  77. Sylvania 6L6GC vs GB
  78. blues junior wont make noise
  79. UNBELIEVABLE! After playing since 68, i blew up my first amp!
  80. Plugs for amp face plate holes????
  81. Heritage Victory question
  82. TECHS: Dead spot on treble pot. Is it dirty?
  83. Why Pursue Tube Drive and Then Use Pedals?
  84. Economical power filtering?
  85. Strange Mesa static noise
  86. Quick DRRI ohms question...
  87. Ground loop? Peterson tuner into amp
  88. 25 watt Greenback Speaker question...
  89. Celestion Alnico in a '64 Deluxe
  90. Can a THD hotplate cause your amp to blow a fuse?
  91. Mismatched power tubes??
  92. Odd tone problem, guitar sounds out of tune
  93. February Amp Build Seminar
  94. A good tubes book !
  95. "Bigger Iron" (tranny affect on tone)?
  96. Marshall JMP Filter Caps
  97. Can this be done (wattage lowering content)
  98. Mystery cap drainage.... recto diodes?
  99. What are some great 12au7's??
  100. Help me brush up on my capacitor math.
  101. Tube Matching & Biasing
  102. Sound City blowing fuses
  103. lost my blackface cleans
  104. Feedback Issues
  105. Class-A versus Class-AB...did you know?
  106. I can't even change a tube
  107. Remind me: +/- on Eminence speakers?
  108. Help with old Fender Princeton Amp
  109. DRRI Problem
  110. I dont even know
  111. Opinions about how much filtering
  112. Solid State wattage question.
  113. Replacing power transformer in Deluxe... make sure i've got it right.
  114. Can a Hot Plate hurt an amp?
  115. Power Tube Too Close to Speaker
  116. Bad Speaker Cable - Fried Amp?
  117. Allen Old Flame Layout???
  118. For those who switch between amps--pedals/fx loop?
  119. Solid core speaker wire?
  120. Negative Feedback Loop Pot
  121. amp is... "boing"-ing???
  122. Long-term speaker storage
  123. Bluesbreaker reissue question
  124. Bassman 1964 question
  125. Determining ohms of unlabeled OT taps?
  126. "Less than a noobie" question.
  127. Blackface Fender gut shots anyone?
  128. Orange Drop Directionality?
  129. Stereo amp for guitar use?
  130. Power tubes glowing blue?
  131. Aw mom, not Zinky Hummables....
  132. Installing a Master Volume?
  133. Quick 6V6 biasing question...
  134. Hey you amp techies... Please look at my 68 twin and...
  135. Ohms
  136. Origin/Theoritcal Basis Of Blackface Tonestack?
  137. Caps...is there anything special when installing them?
  138. Can I run my cab with two amps?
  139. Anyone Set the Bias on a Cornford Mk50H?
  140. Output X-frmer for Ampeg B-15 Portaflex
  141. Gibson Skylark ga5t/Epiphone Pacemaker ea50t help
  142. Finished my Metro amp super lead !!!
  143. Marshall 2203 tube swap question??
  144. Anyone having problems with a Marshall2061x 20 watt head??
  145. Need a good Marshall Amp Tech
  146. Speakers rear vs. front mount
  147. Super Champ Needs a cap job, But.....
  148. pro junior usa vs mexican?tweed vs ..black?
  149. Need schematic help: Univox U 155R
  150. Matchless RV-1 Unit Problems
  151. Instead of all the epi Valve Jr Mods....How About a Treble Booster?
  152. Upgrading old amp from 2-prong AC to 3-prong
  153. Plate-to-Cathode caps a la DB?
  154. Recommandations for blackface bassman tech
  155. Blown OT?
  156. Do Pre-Amp Tubes Need to be biased?
  157. Vibrolux Filter caps
  158. reverb tank for Vox AC30cc 1x12
  159. Anyone Built Their Own Cab? I Need Help!
  160. Fulltone Tube Tape Echo 12AX7 recommendations
  161. Adding a line out to a tube amp?
  162. Deluxe Reverb bright cap question
  163. Old Princeton With Low Level Breakup
  164. A Question For Marshall 1959 Slp Players
  165. BF Bassman: Silver Mica?
  166. biasing a peavey classic 50...
  167. Tube Wear at 1/2 Power
  168. Bias Tubes
  169. Half the problems with old amps...
  170. Can someone ID these EL34's?
  171. Bassman Ten ohms question
  172. Blues Junior's tone deteriorates after 20 minute play time (?)
  173. tube buffered effects loop box?
  174. Heater question
  175. How hard is it to mod an amp with no FX loop for reverb?
  176. question for the tube experts
  177. Echoplex: Power transformer secondary HV
  178. OT / Speaker Hook Up
  179. A diode is a diode?
  180. Fav 5Y3???
  181. GT 6L6 BP's
  182. Amp to mixer with no speaker - how?
  183. Goosing up a 65 DR
  184. Has anybody tried CryoValves
  185. Clean boost yields preamp or power tube distortion?
  186. What's Your Favorite 6v6 in your Fender?
  187. Learning About Electricity...Goals To Work On Equipment...
  188. Need SF Champ help
  189. Upgrades/mods Ac30CC1
  190. Building a speaker cab
  191. installing new tubes in a Valve Jr.
  192. New Build Reverb Tanks
  193. Help! Am I going crazy? Whats wrong here?
  194. Is This Handwired?
  195. Classic Marshall 4x12 Wiring
  196. Fender Blackface gurus, help please (gut shots)
  197. WEBER BIAS RITE (question concerning toggle selections)
  198. super reverb making weird noises!!
  199. Brownnote amps
  200. Chassis Gut Shot! 1962 Fender Brownface Pro
  201. Got a rattle problem not the speaker
  202. Speaker Input Jack Question?
  203. Tube to Solid State Rectifier
  204. What can a tech tell by looking at an amp?
  205. Awwww, man..am I to hot?? (KT-66 content) HELP
  206. Marshall MK II 50 watt
  207. Can anyone identify this 6BQ5?
  208. NEED HELP!!! Readings gone..........?????
  209. Tube depot question
  210. Urgent Help please!
  211. Tubes, how to know when they are near the end ?
  212. What is this? Reverb?
  213. No power at all question.....
  214. defective hot plate?
  215. JTM 45/100 question
  216. Wiring two 8 ohm speakers for 8 ohms?
  217. RoHS compliance, WEEE, can someone explain please?
  218. Groove tube solo-one is a dog!!!
  219. FTR-37 is blowing fuses
  220. Ohm?
  221. Late 70's Vibrolux Reverb queries
  222. rectifier tubes...some better than others?
  223. Power transformers!
  224. Do Volume Boxes work ?
  225. Can I use bigger tubes in a Deluxe Reverb II
  226. Super Reverb rectifier question
  227. Sound City Chassis Question, pic in thread
  228. who's got parallel triode amps - matchless etc?
  229. old Fender and 8ohm cab and hot plate
  230. Why the Lower Ohmage on Fender Amps?
  231. What tubes to replace these odd ones ?
  232. MFD same as uF?
  233. Has anyone tried 4 of Jensen Neo 10's in a SuperReverb?
  234. How bad is it for an amp...
  235. bassman 2x12 cab questions..
  236. Any Good Speaker Reconers in Texas?
  237. Need Marshall DSL 401 and Cabinet Ohms Help!
  238. Need help testing 6BQ5/EL84s pulled from a Hammond...
  239. I'm picking up radio station through amp...
  240. 69 Bandmaster reverb-rebuild
  241. Do variacs help in voltage regulation too?
  242. Plate resistors in Marshall circuit creating noise?
  243. built a guitar amp. need some troubleshooting advice
  244. Selecting correct wattage speakers!
  245. Power cord question
  246. Update - Cryo Tubes
  247. AC-powered Flanger - electrocution danger?
  248. Preamp tubes - when to buy "balanced" and/or "matched"?
  249. Tubes identification
  250. help with a hot rod deluxe