Really?
It is sort of my standard rectifier tube for less powerful applications. Easy to get..cheap...etc..etc. slow warmup..
Bummer.. 🙁
Really?
It is sort of my standard rectifier tube for less powerful applications. Easy to get..cheap...etc..etc. slow warmup..
Try modifying any of your circuits using 6X4 to accept the cheapest 6X5...and,except if you have tin ears,you'll hear the difference!
It is sort of my standard rectifier tube for less powerful applications. Easy to get..cheap...etc..etc. slow warmup..
Try modifying any of your circuits using 6X4 to accept the cheapest 6X5...and,except if you have tin ears,you'll hear the difference!
Re: RIAA BRIGADE.
Haha. Good catch Frank!
Yeah, how people can evaluate a tube's performance (in a circuit) without understanding the circuit is beyond me....
fdegrove said:
Haha. Good catch Frank!
Yeah, how people can evaluate a tube's performance (in a circuit) without understanding the circuit is beyond me....
Re: Re: RIAA BRIGADE.
OK,enough is enough!
It seems that,actually,there are more things beyond you,....for instance,the "reading between the lines" thing.
Of course that a tube's behaviour is completely different in a circuit as the RIAA case and the test rig.Of course that I know what the RIAA principles are.What I meant to say is that:
The average and some special ECC83's I tested ON THE RIG showed almost the same freq charactheristic,as all falled around 31 KHz.In other words,Roger Modjeski was right,even if you agree or not. (and please spare me on "how bad I made my test rig" stuff...)
On the second hand,it doesn't look strange that anyone pretends that such a tube can go up to 80 KHz in some "real life" apparatus? If I were you,the first question would be "is the schematic/topology free of phoney stuff?".
As for the heart of the problem,I really don't care if some of you tend to look at the LP source as if it's CD,regarding the bandwidth.Everybody's hearing is slightly differerent,not to mention the other perception capabilities of the human body.If you don't know what's all this about,try on the Net and you'll surely find something to enlighten you.🙄
Joel said:
Haha. Good catch Frank!
Yeah, how people can evaluate a tube's performance (in a circuit) without understanding the circuit is beyond me....
OK,enough is enough!
It seems that,actually,there are more things beyond you,....for instance,the "reading between the lines" thing.
Of course that a tube's behaviour is completely different in a circuit as the RIAA case and the test rig.Of course that I know what the RIAA principles are.What I meant to say is that:
The average and some special ECC83's I tested ON THE RIG showed almost the same freq charactheristic,as all falled around 31 KHz.In other words,Roger Modjeski was right,even if you agree or not. (and please spare me on "how bad I made my test rig" stuff...)
On the second hand,it doesn't look strange that anyone pretends that such a tube can go up to 80 KHz in some "real life" apparatus? If I were you,the first question would be "is the schematic/topology free of phoney stuff?".
As for the heart of the problem,I really don't care if some of you tend to look at the LP source as if it's CD,regarding the bandwidth.Everybody's hearing is slightly differerent,not to mention the other perception capabilities of the human body.If you don't know what's all this about,try on the Net and you'll surely find something to enlighten you.🙄
Re: Roger Modjeski
Isn't he the bloke who claims to get 35W from a pair of EL84s?
Ha ha ha ha ha
7N7
Le Basseur said:
Isn't he the bloke who claims to get 35W from a pair of EL84s?
Ha ha ha ha ha
7N7
Re: Re: Roger Modjeski
Heavily cooled,maybe....
But,go on and hang me because of one of Modjeski's doubtful claims....
It seems that the world is already splitted😱n one side,you,the geniuses,and on the others,we,the fools...
7N7 said:
Heavily cooled,maybe....
But,go on and hang me because of one of Modjeski's doubtful claims....
It seems that the world is already splitted😱n one side,you,the geniuses,and on the others,we,the fools...
Re: Re: Re: Roger Modjeski
And a dab of Tube-o-lator of course....
7N7
Joel said:
Only if they have a diamond embossed in the base.
And a dab of Tube-o-lator of course....
7N7
Re: Re: Re: Roger Modjeski
Come on now, calm down. If I were a genius, then I would be able to get 35W from a pair of EL84s.
7N7
Le Basseur said:
Come on now, calm down. If I were a genius, then I would be able to get 35W from a pair of EL84s.
7N7
The bandwidth you'll get from a 12AX7/ECC83 circuit always depends completely on what the circuit is- and often on what's the circuit driving it. To claim that the tube itself craps out at some fixed frequency is... odd.
AVOID ME LIKE THE PLAGUE....
Hi,
Here's something that might be beyond you:
An ECC83 and all its' equivalents is pretty usefull in a tube MM phonopreamp where you can reduce the number of active stages thanks to its' high voltage gain.
When cleverly applied you can have its' Miller capacitance work for you iso of against you and still have wide bandwidth in the end.
Let it be understood that I always respected Mr.Modjeski for he really did/does help to advance the art of music reproduction, it's just that I feel that the 6DJ8 family of tubes is better suited to other tasks such as I/V conversion in a DAC or if you feel to go tubes all the way, in a tube headamp where again it does the I/V conversion for the MC cartridges.
That task plus possibly the task as an error amp in a tube regulator is about all I think it is suited for if your a demanding person such as myself.
And yes, I realise that there are fine preamps out there using just the 6DJ8s as active elements.
And no, I don't want to start another round of bickering on this, please?
Cheers,😉
Hi,
Here's something that might be beyond you:
An ECC83 and all its' equivalents is pretty usefull in a tube MM phonopreamp where you can reduce the number of active stages thanks to its' high voltage gain.
When cleverly applied you can have its' Miller capacitance work for you iso of against you and still have wide bandwidth in the end.
Let it be understood that I always respected Mr.Modjeski for he really did/does help to advance the art of music reproduction, it's just that I feel that the 6DJ8 family of tubes is better suited to other tasks such as I/V conversion in a DAC or if you feel to go tubes all the way, in a tube headamp where again it does the I/V conversion for the MC cartridges.
That task plus possibly the task as an error amp in a tube regulator is about all I think it is suited for if your a demanding person such as myself.
And yes, I realise that there are fine preamps out there using just the 6DJ8s as active elements.
And no, I don't want to start another round of bickering on this, please?
Cheers,😉
BEAT ME TO IT...
Hi,
Our fellow SY beat me to it I see.
And I would only like to add that this can be said of pretty much most tube types we use for audio applications.
Even when that particular tube wasn't designed for audio use in the first place, not that many were anyways.
And the 6DJ8 most certainly wasn't one of them.
Cheers,😉
Hi,
Our fellow SY beat me to it I see.
And I would only like to add that this can be said of pretty much most tube types we use for audio applications.
Even when that particular tube wasn't designed for audio use in the first place, not that many were anyways.
And the 6DJ8 most certainly wasn't one of them.
Cheers,😉
Re: AVOID ME LIKE THE PLAGUE....
Hi Frank !
Can you please explain me how the 6DJ8 can perform the I/V conversion in a DAC???
fdegrove said:
Hi Frank !
Can you please explain me how the 6DJ8 can perform the I/V conversion in a DAC???
Defusing...
Hi Jorge,
Same as you do that with a MC cartridge really.
The 6DJ8 is very linear at Vg=0, so all you need to do is run it at low voltage, say no more than 40 Volt, ground the cathode and provide a very low input R...10 to 20 R depending.
I'm not saying it's going to work out will all DACs but it can, this is what we used on some Audiomat DACs and they're one of the best money can buy.
Cheers,😉
P.S. Jorge, I'm sorry but I can't disclose all the details for commercial reasons.
Hi Jorge,
Same as you do that with a MC cartridge really.
The 6DJ8 is very linear at Vg=0, so all you need to do is run it at low voltage, say no more than 40 Volt, ground the cathode and provide a very low input R...10 to 20 R depending.
I'm not saying it's going to work out will all DACs but it can, this is what we used on some Audiomat DACs and they're one of the best money can buy.
Cheers,😉
P.S. Jorge, I'm sorry but I can't disclose all the details for commercial reasons.
The I/R/V conversion
But in the case you point ...is the resistor (10 to 20 Ohms) that do the I/V conversion...and the tube only do the amplification of the resulting voltage...
As the grid of the tube is a very high input impedance ...the current only goes thru the resistor...and any thru the circuit grid cathode!!
Cheers😉
fdegrove said:
But in the case you point ...is the resistor (10 to 20 Ohms) that do the I/V conversion...and the tube only do the amplification of the resulting voltage...
As the grid of the tube is a very high input impedance ...the current only goes thru the resistor...and any thru the circuit grid cathode!!
Cheers😉
A MAN AND HIS TUBES.
Hi,
Purrrcisely...and that was exactly why I objected against feeding the feedback loop straight into the cathode of the input tube.
Remember that thread Jorge?
Cheers,😉
Hi,
Purrrcisely...and that was exactly why I objected against feeding the feedback loop straight into the cathode of the input tube.
Remember that thread Jorge?
Cheers,😉
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