View Full Version : Amp Technical Info
- Anyone have the 80s Dumble Schematic
- should power tubes glow orange while playing the amp?
- Explanation of Self-Biasing/Cathode Biasing
- Mesa Studio .22 Rebuild?
- looking for nos mullard tubes
- Victoriette el84s to 6L6s
- Carr Mercury boost switch
- I dropped my amp....
- Heat Dissipation?
- Amp Kit
- Guitar POD digital distortion
- Who Knows a good Amp Tech in Los Angeles?
- Rebiasing a Marshall JTM 60
- How does Bogner get 80 watts out of a SHIVA?
- Bad Cat Effects Loop ?
- Fuchs headroom.
- Marshall 2203 bias balance help sought
- Nightmare on Marshall Street
- Variac help
- KT88's?
- Changing EL84 amp to 6V6 or ?
- capacitor question
- Removing tolex?
- Voltage help
- Noise!?@#$&*$
- pentode mode / triode mode? please explain
- Biasing EL84 Based Amps
- 18 Watt clone speaker suggestion
- 5Y3 in Maz Jr.
- Alen Old Flame Problem...
- Changing combo> head
- Help! My amp is sick..
- rectifier tube swap question
- What are some ways to tell if you have a Telefunken ECC83?
- Schematic for Duncan 60 watt
- problem with SOLO function on Mesa RectoVerb
- Bad Cat Hot Cat speaker replacement?
- Tube problem or not?? my amp is more broken.
- New (but used) amp problem, can I really have a bunch of bad tubes or is it the amp?
- Bassman AA864 vs. AB165 gain stage question
- Broken Amp (Busted Fuse?)
- Combo amp resonance noise
- Different Sovtek 6L6's
- making a cheap amp better
- Identification of a Potentiometer
- Proper way to retrofit 3-prong to BF Bandmaster.
- Amp Biasing: How to support the chassis?
- Blowing fuses
- Just picked up 10 nos mesa 12ax7's from the 80's
- 6L6 Recomendations
- Princeton Reverb Toubleshooting Help
- SLO 100 V1 tube
- Amp running without cab...
- Can I do this?
- For those who dig this stuff: my YGM-3 chassis, before & after
- Power transformer is Hot!
- Rectifiers question
- Capacitor type question - help please
- What Multimeter?
- Using 6V6's in place of 6L6's
- Help with Mesa F-30
- Marshall 2204 question?
- 5U4 question...
- getting new speakers. ohm question
- Traynor EU mods?
- Resistor question
- Power Tube Dampeners?
- Fender Bandmaster
- 1978 Princeton Reverb.
- Treble Trouble
- new power tubes/same ol' farting amp
- Can this harm an amp? (speaker-related)
- Pearl Tube Coolers
- Safety when working on an amp?
- HELP with tube change!
- How can I get power sag without using a tube rectifier?
- Loss of volume
- Ac Dc
- EL-84--Sovtek vs. J.J ??
- I have a good FX loop but Can't I skip it?
- How to...
- John Phillips, other amp experts... URGENT!!!!
- Blues Jr vs Pro Jr
- Bias drift or runaway Help needed!
- Effects Loop Problem
- fender bronco
- using US 9V power transformer in UK
- Problem with Aluminum chassis
- Need Help - Need to Revese the Phase in Effects Loop
- Amp Protection question
- HELP!!! - AC30RI Output Tube Socket Replacement Question
- GT Soul-O 45: What makes is "pedal friendly"?
- 69 Deluxe Reverb question
- custom poweramp - would this work?
- Where to buy the best/cheapest variac on the net?
- running without load?? help
- Dancing impedance reading from cab? Help needed!
- Phase Inverter
- What makes an amp sing?
- Diode In Bias Supply
- 1U blank rack chassis
- new custom poweramp idea!
- adjustable bias pot???
- Deluxe Mod?
- 6CA7 vs. el34
- TUT Vol. 3
- Does impedance always have to match?
- Ballance and bias for each output tube
- Amp Speaker Outputs: Which to use? Why?
- Pre-Amp tube suggestions?
- Feedback destroyers?
- Need Speaker Cable Suggestions...
- Speaker choice for 64 Bassman head combo cab?
- bias diode
- Would a bad tub effect the LED on the footswitch of my Two Rock?
- Where is the best place to buy tubes?
- Attenuators
- Dropped my power cord in calcium chloride, should I toss it?
- 1972 Ampeg Svt Head
- Bias setting question
- Does lower wattage speaker = faster breakup
- Mesa Studio .22 Tech help needed...
- DIY Attenuator
- motorboating JCM800...
- Preamp tube layout for VHT 50 CL?
- Amp gurus! Intermittent crackling question..
- Lower mains voltage: What to do??
- "Dummy Load" Question???
- anybody use 2 1x12 cabs in series/parallel?
- working safely on an amp... discharging caps and such
- GIve me your input on different el34's
- Help ID which amps are Class A
- Tubes for Mesa's
- Impact of a 6.6k primary
- Technical tube question...
- Sound "disappeared"
- Standby Switch Usage
- Mesa Lonestar
- 5U4GB rectifier tube
- Speaker Area and Volume
- Speaker cabinet question
- Tube duties in a Maverick
- 3 prong install, problem now.... please help if possible.
- tremoverb power reduction question..
- My Amp plays all by itself! No kidding
- Feedback/oscillation problem... where do I look?
- Question for cabinet/amp builders
- Preamp tube with lowest mids-to-gain ratio
- Amp sound loss
- Sad about my Carman Ghia
- transformer for a 12AX7+50L6+35Z5 amp?
- .015uf good caps @least600V -where?
- EV Speakers
- I see dead people - Working on My Amp
- Torres overhaul kits, any good?
- fender tube replacements
- Bad Phase Inverter
- Balanced PI tube
- Location of Bias Pot on Fender Super Reverb?
- Koch Reverb Puzzle
- Canadian parts sources for DIY amp/cab builders?
- 66 Bandmaster Ohms?
- Train Wreck Mod?? Or other master volume mods??
- Hoffman Board Kit
- Help me bias my Two Rock Ruby...
- Before and After pics of my Fender amp - shellac'n/relic'n.
- EVs- much louder than the average speaker?
- Ei EL84s in a Matchless???
- Shallow Vibrato on '70 SFDR
- tropical fish caps
- Fargen Mini Plex + Mighty Plex gain & tone mods
- 6V6s in a Twin Reverb/Dual Showman ????
- Any one done the Tim C vibro-king mod?..need help
- Problems with my cab. Help please!
- Ohm help please
- Can you tell me about these tubes?
- Last Vibro King question..I promise
- how to tell when power tubes need replacing?
- anybody ever convert a BF/SF twin to tweed specs?
- PPIMV's and effects loops...
- no output from power amp?
- rectifier questions
- Re-biasing my Cornford Amp
- pot values
- Replacing the Vibrato Bug in a 64 Deluxe??
- SS rectifier & 6L6's in a 64 Deluxe
- Are there "bias test point" kits?
- Re-wiring old PA amps for guitar
- loud hum in amp--like ground hum(?)
- safest place to buy NOS or USED TUBES?
- Blues..........
- problem w/ 67' Deluxe Reverb
- Class A Deluxe ?
- Understanding EL84 "current" ratings?
- Fender blues Jr
- Setting the bias on an Alessandro Working Dog amp?
- Two filter caps 500% off spec!! WTF?
- Will this hurt my amp?
- Can I use a 5U4GB in a tweed Bassman
- Recap a BF Super Reverb?
- More speakers, less speakers
- Is switching between 6L6 and EL34 just matter of re-biasing?
- Stop, hey, what's that (60 Hz) sound?
- Head Shell vendors?
- AB868 - Q re. cap on V3
- Tim C Vibroking Mod...Review
- Speaker Power Handling Question
- vintage tube experts,i have a question?
- Hot Deluxe Reverb
- Mismatched tubes=bad, right.....?
- The Amp Bias spreadsheet and more...
- Custom Chassis???
- speaker wattage & amp's power
- What tubes in my AC30?
- converting a guitar amp to a Hifi amp...
- 6C10 tubes for Fender Super Champ
- Biasing my Alessandro Working Dog w/ Weber Bias Rite
- Where to find EF86 ultra-linear schematics for inspiration?
- 5u4gb for 5u4g?
- Multiple amps again.
- Dating an SF Bassman head
- Fender Bassman RI Tube Question
- Help needed with a Victoria Champ Problem
- Great site for Mullard and Telefunken`s cheap
- Questions on using a speaker load to bias an amp...
- Bad readings using Weber bias rite kit. Help!
- Standby Switch
- ptp board or Mercury Magnetics OT for 59 Bassman RI
- marshall jcm 900 cab w/ 1972 50w head?
- Silvertone repairman?
- What tubes have the sickest gain?
- vox ac30 noise issue problems
- Hoffman 5F6A board for 59 Bassman RI
- Is there any way to compensate for the "drawbacks" of 6v6s?
- anybody have a schematic for a fender super 60
- GT "substitiube" rectifiers
- how much do you need to know to build an amp?
- Which amps can you bridge channels on?
- What Preamp Tubes to use
- HELP!!! My amp is messed up!!!
- 12AT7 vs 5751
- Just blew my Polytone...
- Power tubes don't light up, but preamp tubes DO!!
- Impedance matching
- Just Got My Weber Bias Rite ...
- Tonal effects of OT upgrade?
- 5AR4 in a tweed deluxe?
- No Standby and Tube Longevity
- Odd amp noise question
- Replacing Speaker Wire
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