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  1. How to test output transformer performance for overperforming amp
  2. Mads Vox ac30c2
  3. 12AY7 PI tube, good, bad or ugly? Your thoughts please.
  4. 5f1 champ w/electronic reverb
  5. reducing reverb effect in deluxe reverb aa763 circuit?
  6. Champ 600 EQ mod balls-up!
  7. More Thomas Vox repair manuals
  8. Negative feedback, and resonance question?
  9. BF Princeton Reverb - wider range for treble pot
  10. Schematic question?
  11. Preamp stage help please.
  12. Modding gain stage on amp
  13. How does this look for a boosted up reverb unit circuit?
  14. Peavey Delta Blues Distorted
  15. Teach me a little something about NFB in a Deluxe Reverb
  16. 65 ReIssue Super Reverb Midrange Pot change
  17. Tweed Deluxe Coupling Cap Changes
  18. Suggested Mods for Peavey Butcher - Negative Feedback Loop Tone control?
  19. Adjustable bias and measuring points Valve King 112
  20. Peavey Artist VT resonance & presence mods
  21. Marshall JTM 60 choke mod
  22. Peavey Valveking Pre PI Master Volume mod Thoughts?
  23. THD picovalve
  24. Marshall dsl 15 h mod help
  25. Watkins Dominator extra stage?
  26. Power supply filtering
  27. Understanding/improving JTM60 FX LOOP
  28. 5E3 cascading inputs MAD FEEDBACK! Need fix
  29. Replace 2 x12" speakers with 1x 15", possible? Worth it?
  30. adding DC heaters to a high gain 100 watt amp
  31. ValveKing 100 mod questions
  32. Orange Dark Terror. Mod for more resonance.?
  33. Elevated AC heaters?
  34. Mods for a B-52 ST100A (can get one dirt cheap)
  35. Hum/Noise vs shielded cable or twisted wires in a Peavey Triumph 60
  36. A bit confused about V1 and V2 in my Mesa F-50
  37. LED activation from 5v winding?
  38. advice on more bass and treble from "Micro Champ"
  39. effects loop idea
  40. question about mods to valve amps
  41. Inexpensive L-Pads...
  42. Change led color and some mod to footswitch
  43. Hammond / Everett AO-50 conversion to Vox AC15
  44. Mesa Boogie F-50.. what is this?
  45. Question about using relays for foot s/w
  46. Bugera V22 Infinium CHOKE mod
  47. Opinions on a relay activated volume boost
  48. Bright Switch/Cap Wiring
  49. would a Master Volume solve my issue?
  50. MOSFET PI, how to Bias?
  51. Fender M80 Overdrive Channel
  52. Ampeg Ba 210 SP High EQ mod?
  53. Can't Turn Volume Completely Off
  54. Solder Both Sides of PCB?
  55. Adding gain stage to Marshall 2203; handling the 10k cold clipped stage
  56. Adding an on/off reverb switch to vintage amp
  57. Fender Twin Reverb
  58. DSL 100: Changing Grid Blockers and Bias Resistors
  59. Mesa Boogie SPAX7 in a Peavey Valve King Head.
  60. Effects loop on a AC15CHWX
  61. New AB763 Blackface Mods Page (includes DRRI & 68 CDR)
  62. Ampeg B-15 Preamp...
  63. Modding Boost Switch on Bugera V22
  64. 65 Blackface Fender Showman PPIMV
  65. Peavey Valve King 112 Dynamics/Attack/Gain fuzz MOD
  66. Final tweaking of a 1959SLP Re-issue..
  67. JTM60/JCM600 important MODS
  68. Adding a choke to Sovtek Mig 60
  69. I wish I had one of these years ago - '71 Traynor YBA-1 gets Plexi modded ** CLIP **
  70. Peavey Triumph 60 Hum
  71. Fender Frontman Mod.
  72. Removing power valves to reduce output
  73. Fender Reverb Mods
  74. Vox DA5 lineout modification - speaker bypass
  75. Princeton 112 Plus - 50k 15A Volume Pot Mod - Part Number And Source Needed, Please
  76. Possible to add NFB to this schematic?
  77. lower wattage in 5E7A tweed pro?
  78. Peavey Classic 50 Blue Guitar Mods
  79. I think it's attenuater time
  80. Pushing V2 harder within older fenders. Pre-amp clipping mod?
  81. Bassman AA568 unused triode applications
  82. Super Reverb '65 RI - Changing Output Transformer to Match Speaker Load
  83. Log/ Lin Bass Pot (DlxRev).
  84. EL34 in a Champ?
  85. Blackstar Artisan 100 circuit PPIMV and FX Loop Mods
  86. 6150+ Mods and a real engineer guitarist!
  87. Adding Filament Transformer to Sovtek Mig-50. How to place it?
  88. Thank you Valvewizard - Ground, hum blocking
  89. Replacement speakers poll
  90. Bias points
  91. 5150 bias mod
  92. Fender Pro Jr More Bass
  93. Trying New Speakers/replacements
  94. Marshall Amp increase Bass/low-mid response
  95. Can y'all help me with a minor mod to a Peavey Rage 158?
  96. Relay wiring for Vox Night Train mod
  97. Adding additional input output to Line6 spider ii amp
  98. Suggestion for moderator - let's spell "Tweeks" correctly!
  99. Looking for more gain mod schematic jcm800 2210
  100. Negative feedback loop mod for Pro Reverb
  101. Using Combo amp Speaker as Cab
  102. Marshall JVM
  103. Are SoZo blue caps the same as Fender blue caps?
  104. Line out help please
  105. I want to reduce the gain in my Peavey Rage 158.
  106. help with some peavey XXX mods
  107. Simplest way to turn a combo amp into both a head and a cab as well?
  108. Amp Mod for some More Gain?
  109. Bogen PA head for guitar? Help with pentode preamp stages.
  110. Another JTM60 1x12 thread/question... (haven't seen this one)
  111. Fender Blues Jnr Mk3 Mod
  112. What's this JCM800 mod do?
  113. What's this JCM800 mod do?
  114. Supro Inspired VVR Question
  115. MASSIVE improvement to Mesa Boogie SOB mod - How to add a real presence control
  116. Adding tube spring reverb to a Mesa Boogie SOB
  117. 5V4 instead of 5Y3 ?
  118. Bypass Digital Board in Super Champ XD (& possibly others)
  119. Epiphone valve standard to increase the treble
  120. Different Speaker Outputs On Marshall DSL 40C
  121. Help needed to upgrade Capacitors in a Marshall DSL 40C
  122. coupling cap to block some bass?
  123. Hicks mender
  124. 2015 VOX Ac30c2 service manual
  125. Drop preamp voltage
  126. Fun new zener tweak!
  127. Convert 5F6A Bassman into 5F8A Twin
  128. Blues Jr, any mods or advice available to convert tube mount pcb to hard wired?
  129. Newest Peavey Classic 30 - Blue Guitar Mods?
  130. Cathode bypass gain boost questions
  131. converting 6sc7 amp to use 6sl7
  132. 6CA7 tubes something different in the place of EL34 ??
  133. Remove ground lift network? JCM900 dual reverb
  134. Gallien Krueger MB150S-III adding Boost circuit ala GK MB150E-III
  135. JCM900 4500 Mod: C27 Jumper or...
  136. cathodyne/LTP switch (for small P-P amp)
  137. Replacing my tone control with an Orange-style shape control
  138. Project! Convert push/pull 'boost pot' to a footswitchable jack?
  139. Fender Twin bias dilema
  140. Fender Ultralinear - KT66, 77 or KT88?
  141. Improved circuit for power tube tremolo in a fixed-bias amp
  142. Bias test points for PCB amp
  143. Fender Frontman 65R volume mod
  144. Peavey Classic VTX 65 watt combo question for Enzo
  145. Eyelet boarding a reissue amp (Fender)
  146. Which switch for high voltage switching?
  147. Carvin Belair - moding one channel
  148. Sound differences from different dual op amps in SS amps
  149. De-biasing a Peavey Classic VT (6L6 output stage)
  150. Tonestack help
  151. add an attenuator to an existing tweeter?
  152. mesa mk IV bias
  153. Conversion to acoustic amp
  154. Taming Fender Blues Deluxe Abrupt Volume Control
  155. Switchable VTM 60/120
  156. SF Twin reverb Ultra linear transformer Blackfacing
  157. Age Old Problem of TOOO Bright Super Reverb
  158. Deeper voicing on EVH5150iii
  159. Different types of power resistors
  160. What cap value for this idea?
  161. Mesa Nomad 55 Reduce the gain
  162. Vox Escort Mains/Battery amp power upgrade?
  163. Possible wrong installation of diodes in place of a 6X4
  164. Taming a Gibson tone stack
  165. "Tighter" Bass on a Tone King.
  166. Peavey xxx upgrades
  167. Cable runs and effect on tone
  168. Help with mod to Crate FW65 Combo
  169. Mesa .50cal EL84 version bias pot mod
  170. Switch ratings for mods with high voltage
  171. Musicman 75 head 2100EX too much overdrive
  172. Marshall DSL mod
  173. Any ideas for a temperature controlled fan for Bass amp
  174. Traynor YBA-3 dummy load to use 8 ohm cabinet?
  175. Slitting speaker cone or knitting needle ? Kinks content
  176. Vox lead escort 50 - integrating valve stage
  177. LTPI on a 6G2?
  178. Adding a footswitch to a Blackstar HT-1
  179. Fender Deluxe 112 Plus Too LOUD
  180. JCM 2000 Marshall TSL 100 mod to DSL 100 Specs
  181. Built-in solid state reverb circuit for tube amp homebrew...
  182. Reduce treble in Fender Frontman 212r clean channel with circuit mod
  183. Silverfacing a Deluxe Reverb
  184. Crate Vintage Club 30 /50 Remove V1 from the dirt channel to reduce gain
  185. ROLAND BOLT 30- 60 cycle hum...
  186. Fender Bassman AA864 variant - mods
  187. Peavey 6505+ 112 mod for channel balance
  188. Peavey Valveking Modifications
  189. tightening up BF Princeton reverb ?
  190. Best way to increase bass response...
  191. E-Wave DG2-30RH head Clean channel too bright
  192. ENGL E320 clean vol mod
  193. Trem and Bias
  194. marshall 1987x hiss reduction possible?
  195. Slope resistor and cap changes when changing a CF side to a 12ay7/12au7
  196. I wish to modify the tone stack in my Ashdown Mag 300 head.
  197. Using 12AT7 instead of 12AX7
  198. Subbing 12AU7 for 12AX7
  199. Any thoughts on how to "soften" attack on a Fender Bassman ?
  200. Fender Blues Junior excessive treble
  201. Looking for less low-cut in Randall RVC (like RD5C)
  202. Marshall JCM 900 mod
  203. Modding reverb
  204. Marshall Split channel again (some interesting information)
  205. Changing rectifier in a Ceriatone 5f6A Bassman
  206. guitar amp ->PA =cabulator
  207. Optocoupler in Fender tremolo
  208. Bugera 1960 infinium Schematic
  209. Epiphone Valve Junior OT upgrade -- help please???
  210. Hall Amplification VVR3 in Selmer Treble & Bass 50 Mk3
  211. modifying the Fender Greta line out
  212. Wanna help with basic mods...
  213. B+ voltage drop via Zener/MOSFET question
  214. Minimum output impedance for Marshall Lead 12.
  215. Hammond drawbars - guitar
  216. Peavey Bravo modifications
  217. Hot Rod Deville upgrade
  218. Twin reverb new speakers
  219. 65 Princeton reverb reissue Power transformer pn# 75165 Where can I get one ??
  220. Converting a PCB Champion 600 to a handwired 5F1
  221. Magnatone M13 - Easy Gain Boost
  222. Marshall DSL 100 - Mod to Switchable (50/100 watts)
  223. Fender Hot Rod Deluxe volume pot replacement
  224. Peavey Classic 50 Blue Mods
  225. 12AU7 failed in Orange AD30
  226. Crate gxt-100 is now a BENGL two more related mods needed
  227. Line-In to Active EQ of Fender Super Twin?
  228. Peavey Bandit 65 mods, anyone have any good mods?
  229. Best SGRs?
  230. Fender Greta Tone Control Mod for Music Playing Purposes
  231. Switchable Cathode Bypass Cap help
  232. Adding another tube to a Crate GXT100
  233. 6V6 bias question
  234. Marshall JCM800 4210 Channel Switcher - modification - advice sought.
  235. My amp needs to be louder, said the novice
  236. Marshall Valvestate - Adding Cooling Fan?
  237. Help with Mesa mark V CH2 mod
  238. JCA22H too bright
  239. Crate Gxt-100 looking for any mods
  240. The beauty of a decade box: ab763 tweaks
  241. non-presence 12ax7 phase inverter
  242. bugera 333xl-212 tone stack mod + more
  243. Silverface to Blackface
  244. Rivera S120 Mods - Please Help!
  245. Orange tiny Terror fx loop mod ?
  246. Help on DIY F2B with mods
  247. Changing Plate resistor question.
  248. Compilation of BF Reverb Fender Mods
  249. Guild Thunderbass 50Watt power supply issues
  250. Dual independent bias for a Windsor