View Full Version : Amp Technical Info
- Going rate for cap jobs
- Vibroclone filter caps
- reverse phase
- Ei EL84EG tubes
- unplug that speaker?
- Y cable for two heads into one cabinet??
- Quick tubing size question......
- Dumble OD trim values?
- Rectifiers - Solid State vs Tube
- Bassman Head Slow to Power
- brownface question
- amp tech in minneapolis
- Tube Question
- Bias voltage Question
- 1979 Bandmaster Reverb question
- Over powering a bass cabinet
- tubes for an AC30HW 2*12
- 16 ohm head into a 8ohm cab ?
- blowing amp?
- Boogie 50 Caliber + problem
- Swapping low output tubes for high output tubes?
- Amps without standby question (s)...
- Recommend books for audio circuits?
- What's the "Brown" sound?
- TAD 6L6 power tubes
- Mesa Lonestar makes a loud bang when shut off
- Wire for a marshall cab
- Yet another Dumble conversion...
- speaker wiring question
- Help, only 1 power tube glows
- 64 Vibroverb tranny quest
- Volume going up/down.... bad tube?
- Pedal or signal path problem.
- Speaker doping?
- ohms of the 1960 Ampeg Jet (Speaker swap)
- Recommend an oscilloscope?
- Tonal Characteristics of Cathode Biased Amps...
- Deciphering Ruby Tubes label on EL34's...
- el34 test data ...... good?
- Amp experts come to my rescue!
- Plate dissipation vs. Power output at speaker
- Installing Speakers yourself...how hard?
- Using Two Amps with One Cab?
- Sourcing 3/4" Italian poplar ply
- Carvin Factory Hot-Rod Mod??
- Solen Polypropylene Caps
- Question for tube tester gurus
- 64 Deluxe Reverb Voltage question
- Best NOS tubes for Marshalls?
- Biasing question - if power tubes are matched but...
- Un-Matched Tubes = Best Tone?
- Solid State or Tube?
- Smooth vs. Ribbed
- Tubegarden Harvard circuit
- tube question...
- el34 and 6l6, interchangable?
- What proves a tube is microphonic?
- What does Oscillation sound like?
- impedance = power & volume loss
- I have a Crown CE 2000 amp on the fritz..
- Celestion G12 Alnico Repros on Ebay?
- Fender Champ 12
- making my champ clone clean?
- Help! Amp Problem!
- Celestion Blues in a Bluesbreaker?
- 4-ohm parallel or 16-ohm series?
- Do I need to rebias my Marshall 2203X if I pull 2 power tubes?
- NOS Phillips Miniwatt EL34's
- changing valves
- strange tube thang...
- Please help! How do I find the center tap of an o/p tranny?
- retainer springs making tube microphonic?
- Couple things on EH and RFT's
- Need help with transformer ID
- Another Tube Pulling thread.
- Help restoring 1961 Fender Vibrolux Reverb Amp
- Can you hear a difference in brands of rectifier tubes?
- TAD 6L6 tubes
- GT Chinese 12AX7....
- How to ID 9th generation chinese tubes?
- SOVTEK MIG-50 pilot light??
- polarity of an old fender
- Is it true that the better the clean channel on amp.....
- (preamp question)v1~v4 what does that mean?
- 6l6 - 6v6
- JCM Blowing fuses after a strange hum. What is causing this to happen?
- '61 Reverberocket fails!
- Need advice on how to troubleshoot a hum
- chirp/squeel from Fender Vibrato circuit
- Who makes the best sounding EL34's in Production Today?
- Question about Tubes?
- Biasing your own amp
- cathode switching vs B+ (plate)switching
- Power, but no sound
- VHT Pittbull Bias and related
- another biasing thread-jsx
- Impedance matching?
- Mesa amp troubles started while playing.
- Replace Classic 30 MV pot for better control?
- Tungsram 12AX7- these any good?
- newbie
- Tube questions
- pulsing standby light AC30
- Ok, tube historians
- What does a blown speaker sound like??
- Help
- Circuit question regarding a higher gain preamp tube
- NOS tubes for Fender Vibro Champ
- Does Unused Solder Go Bad Over Time?
- high gain kicked in
- Anyone have a tube chart for the Vox AC-30 handwired?
- Zinky Superfly - Stuck with Sovtek 5881's?
- Mods for Epiphone Valve Junior
- Blackfacing a Bandmaster Reverb to AB 763 Vibroverb specs
- I Need EF86 Tube Help
- Help quick, Is this a good deal on a Princeton?
- Vibrations in chassis, but not on a cab?
- series/parallel wiring and output transformer
- Weber Mass 50 in parallel
- Wrong impedance!
- SLO-100 Warren Haynes Mod
- What are the best cheaper tube amps to practice mods on
- Trouble with Soldano Decatone - tubes?
- How does this work?
- Hot Rod Deluxe question?
- peavey XXX problem
- Best amp "feet'?
- Any technical info on Bogen Challenger CHB10?
- 12az7
- 6L6/5881 in a deluxe?
- Best brand and types of resistors and caps
- Recommend an internet dealer for a quad of EL-84s
- Help
- Power and Volume
- My opinion: Sylvania 12ax7 NOS sounds sick in V1
- Amps for Idiots.
- Fender low-end problem when using a tremolo pedal.
- any amp tech/modders in Texas?
- Pre-amp question(s) from a newbie to Amp tech...
- Do you have to bias pre-amp tubes?
- VOX AC-30 with O'Connors Recommendations
- Gibson Supergoldtone GA-30Rv died
- Anyone used Lowery labeled 12ax7s?
- Crackling noise in my Hybrid build
- Variac amp rating question
- O.K. Marshall experts, here's a strange one.
- Biasing EL34's
- tracking down hum and grounding
- Fender 59 reissue Bassman
- Very noisy amp, yuck!
- Need help with a subwoofer issue
- Quick tube pulling question (100w -> 50w)
- lee jackson mod DVD
- An ohm question....
- logo glue?
- Fender 75 mods?
- Marshall DSL201 problems
- rectifier tube retainers for an Orange AD15/12?
- Loose power tubes
- did a stupid thing, help.
- Congested ! 6CA7 Candidate ??
- Roland Bolt 60 question
- Trouble getting Winged C el-34's
- Which Euro NOS tubes flash on startup?
- AC ADAPTOR question
- Question for amp builders
- Reducing the feedback inna Sup Reverb
- Tube guys?
- Please explain tube "ratings" to me.
- Having an audio output transformer replaced - which way to go?
- replacing transformers in tube amps
- PI plate resistor trimmers?
- JCM 900 5881 to EL34's
- Justify cleaning effects loop jacks.
- '61 Fender Reverb unit problems
- Need AC30 TBX technical help!
- '64 Super Reverb help! What kind of mod is this? Pics inside
- Master Volume Inquiry
- HELP!My tech says Mustard caps will add bottom end to my Marshall JCM800 2203x reisue
- Tung Sol 5881 Reissue
- Going from a GZ34 to 5Y3 in a 5E3
- Aluminum chassis?
- Question about Fender amp circuit designations.
- Blue Glow in the Tubes???
- Bench power supplies, signal generators, etc.
- Authentic Amperex 6L6GC's?
- Searching for NOS Mullard CV4004 for my V1 slot in my 2203x
- Running without a load
- Opinions on the newer KT66 tubes
- New Kingsnake. Bias problem?
- can you swap a 12by7 for an ax7?
- Ei Gold 12AX7's
- tube recommendations for new Fender 40th Anniversary Twin Reverb
- Kit recommendations, Please
- Silvertone 1484: Switching out the Reverb?
- EL34 to 6550 taste testing
- How to determine if a speaker works properly
- IEC Mullard question
- Ampeg SJ 12 T speaker connection
- Speaker cab design
- Will removing a power tube cut my power in half?
- Celestion, Eminence, VHT
- Which 6550 tubes?
- Question about draining caps
- marshall jmp mkII ?
- 12AU6 versus 6AU6
- Conversion 4xEL84 to 2xEL34
- Koch Help??
- Dating an old Fender speaker...
- OT and PT questions
- 2 to 3 prong power on Sunn 200S
- Grounding an old Supro
- Simple question - tube removal?
- Does anyone know what brand of power tranny is used in a fuchs lucky 7?
- Marshall 2203x HT Fuse blown. Should I check the Screen Resistors?new tubes?
- Let’s talk about screen grids.
- Blues Jr. mods to get it towards Blackface?
- Preamp tube works in one amp - not in another?
- Rewiring Engl from 230Volt to 120Volt?
- Tube swap question...
- !963 sears silvertone tube maker?
- FX Loop mod?
- Valco cathode biased?
- Can EL34's sound good at low volume?
- Tranny Q for Hiwatt
- Help: Engl SE With No Sound
- garnet questions
- preamp tubes
- Bias Test Point installation
- Possible Cold Solder Joint on Speaker
- Are 6AQ5-A and 6v6 tubes the same thing?
- just got new tubes and...
- Hooking up a speaker - stupid question
- Fender amp polarity help
- 63 Vibroverb RI upgrade suggestions ?
- John P, Trisonic, anybody: follow-up: correcting factoy bias on sf Vibro Champ
- Matchless tube help.....
- Impedence and stringing cabs together.
- IEC Connector, Rivets?
- Converting Marshall ptp PA to Lead
- Help installing Celestion G12H30 Heritage!
- Are my NOS RFT ECC83s /Thin plates for my Marshall?
- JTM45 upgrade Output Transformers
- Microphonic Tubes in Fuzz Box
- Best current Prod. 12AX7 Opinions..
- Please help me diagnose this amp noise...
- 6jm vs 6an8 and my garnet pro
- How do I know if speakers are blown?
- '57 Gibson GA-5 crackling...
- Vacuum tube rectifier directly into choke okay?
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