Pre Amp Tubes, need to know |
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Jan 7 2008, 09:21 AM
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According to this article http://en.wikipedia.org/wiki/12AX7 the ECC83 and 12AX7 are one and the same. ECC83 is made in Europe and the 12AX7 in the states or something.. This is as much as I can help, dunno much about amps or tubes, so can't tell if they would sound different :s
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Jan 7 2008, 12:18 PM
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I don't think you have to rebias the amp if you change one tube in the preamp. Try to google around to see what character other preamp tube models have.
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Jan 7 2008, 01:52 PM
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But you have to be careful just dropping in different preamp tubes ...
Some are interchangeable, for instance a 12AU7 is a lower gain version of a 12AX7, but you have to make sure that the voltages are within range for the new tubes etc, which takes some knowledge of the circuits and tube specs. Most preamp tubes are self biased, which means they are preset by a resistor value built into the board, so rebiasing would require you to unsolder and resolder a different resistor in any case. However, in general correct biasing is much more important for power tubes. And another great tube store is tubedepot.com -------------------- Check out my Instructor profile
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Jan 7 2008, 05:27 PM
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Rebias is usually needed for power tubes but NOT always,
as Andrew said,some preamp tubes use different voltage, it's not huge difference in voltage tho but still enough to make small issues. I'm I correct here Andrew?Tony? -------------------- Youtube
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Jan 7 2008, 06:20 PM
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QUOTE (Muris @ Jan 7 2008, 11:27 AM)  Rebias is usually needed for power tubes but NOT always, as Andrew said,some preamp tubes use different voltage, it's not huge difference in voltage tho but still enough to make small issues. I'm I correct here Andrew?Tony? Exactly! Its usually close enough that you will get away with it for preamp tubes, but it isn't 100% certain  You need to be more careful with power tubes as they handle some serious power and voltage and things can go wrong quickly if you run them out of spec. -------------------- Check out my Instructor profile
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Jan 7 2008, 06:59 PM
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Spot on as far as I know Muris
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Jan 7 2008, 07:57 PM
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QUOTE (Andrew Cockburn @ Jan 7 2008, 06:20 PM) Exactly! Its usually close enough that you will get away with it for preamp tubes, but it isn't 100% certain So what damage can we expect if there's some larger voltage difference? Every preamp I've had so far is filled with 12ax7 so I'm not of great experience here... This post has been edited by Muris: Jan 7 2008, 07:59 PM -------------------- Youtube
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Jan 7 2008, 09:32 PM
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www.eurotubes.com is a really good source for tubes and help
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Jan 7 2008, 10:17 PM
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Worst case you will overheat and destroy the tube, that should be the only damage. You will notice the whole top plate glow red, then there will be no more sound
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Live long and prosper ... My Stuff: Electric Guitars : Ibanez Jem7v, Line6 Variax 700, Fender Plus Strat with 57/62 Pickups, Line6 Variax 705 Bass Acoustic Guitars : Taylor 816ce, Martin D-15, Line6 Variax Acoustic 300 Nylon Effects : Line6 Helix, Keeley Modded Boss DS1, Keeley Modded Boss BD2, Keeley 4 knob compressor, Keeley OxBlood Amps : Epiphone Valve Jnr & Head, Cockburn A.C.1, Cockburn A.C.2, Blackstar Club 50 Head & 4x12 Cab |
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Jan 8 2008, 12:00 AM
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QUOTE (skulptor @ Jan 7 2008, 05:28 PM) How do you like the epi amp? I have been eyeing that one from musians Frnd magazine but havnt been able to find one to play on. I have really been attracted to low watt tube amps lately. Its great for the money - tonewise you don't get a super amount of distortion, but it is good for a clean bluesy kind of sound. -------------------- Check out my Instructor profile
Live long and prosper ... My Stuff: Electric Guitars : Ibanez Jem7v, Line6 Variax 700, Fender Plus Strat with 57/62 Pickups, Line6 Variax 705 Bass Acoustic Guitars : Taylor 816ce, Martin D-15, Line6 Variax Acoustic 300 Nylon Effects : Line6 Helix, Keeley Modded Boss DS1, Keeley Modded Boss BD2, Keeley 4 knob compressor, Keeley OxBlood Amps : Epiphone Valve Jnr & Head, Cockburn A.C.1, Cockburn A.C.2, Blackstar Club 50 Head & 4x12 Cab |
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Jan 8 2008, 01:53 AM
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QUOTE (Andrew Cockburn @ Jan 8 2008, 12:00 AM) Its great for the money - tonewise you don't get a super amount of distortion, but it is good for a clean bluesy kind of sound. Then add some dist pedal and ROCK the house  Did I say I don't have any combo amp atm??? Must get some,soon 
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Jan 8 2008, 02:02 AM
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QUOTE (Muris @ Jan 7 2008, 07:53 PM) Then add some dist pedal and ROCK the house Did I say I don't have any combo amp atm??? Must get some,soon I've got one - a Cockburn A.C.1 Did I mention that last night I tried to record Bb Beginner with it ? Didn't quite get a sound I liked yet, it was still too clean, but starting to sound cool Think I'll try and add a distortion pedal short term, and redesign the preamp a little longer term.
-------------------- Check out my Instructor profile
Live long and prosper ... My Stuff: Electric Guitars : Ibanez Jem7v, Line6 Variax 700, Fender Plus Strat with 57/62 Pickups, Line6 Variax 705 Bass Acoustic Guitars : Taylor 816ce, Martin D-15, Line6 Variax Acoustic 300 Nylon Effects : Line6 Helix, Keeley Modded Boss DS1, Keeley Modded Boss BD2, Keeley 4 knob compressor, Keeley OxBlood Amps : Epiphone Valve Jnr & Head, Cockburn A.C.1, Cockburn A.C.2, Blackstar Club 50 Head & 4x12 Cab |
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