in those days it was very different
turntable pickups with low signal
humming and noisy phono preamps
low level signal analoge tuners
etc etc
gain was in high need
and tubes were the kings
unfortunately they were almost gone at the time
in USA Audio Research tried bravely
with many many issues of instability
Dynaco kits were 'present'
but not well regarded
I had no idea how good it really was, until I sold it
bummer
but our main problem was that noone knew how to handle tubes, or only very very few
and if not for the internet, and forums like this, it would probably still be like that
and now we are doing all kinds of weird stuff
its really a very big difference, and crazy
enough whining 😀
turntable pickups with low signal
humming and noisy phono preamps
low level signal analoge tuners
etc etc
gain was in high need
and tubes were the kings
unfortunately they were almost gone at the time
in USA Audio Research tried bravely
with many many issues of instability
Dynaco kits were 'present'
but not well regarded
I had no idea how good it really was, until I sold it
bummer
but our main problem was that noone knew how to handle tubes, or only very very few
and if not for the internet, and forums like this, it would probably still be like that
and now we are doing all kinds of weird stuff
its really a very big difference, and crazy
enough whining 😀
yes.......and thanks for internet, the body of knowledge that can be harvested by those willing to learn is indeed awesome!!!.....the only requirement for enrollment is time and an open mind.....😉
I will Jim. It has just been a thought for a while and I've not even asked Pete about it. I just thing it is such a solid design. Actually I don't even know where to start. I'll poke around a bit though.
I'll have to take your word for it Cost. I am a builder more than a double E. In the scheem it looks like the signal takes a right turn to the output before it gets to the EL34s.
How would signal (A.C.) current go through an CCS which by definition only conducts a constant (D.C.) current? The imperfections of a practical CCS not withstanding.
From the AN schematics which I've seen, it seems that they utilize the SRPP and/or CCDA topology for their line amp units which feature an capacitor coupled output. Low output impedance is achieved by employing some form of cathode follower. Some tube afficianados feel that cathode followers (grounded anode) lack the subjective musical quality exhibited by grounded cathode circuits.
AN's more costly line amp units, those featuring a transformer coupled output, appear to utilize cascaded grounded cathode gain stages with a final stage anode loaded by an expensive D.C. biased mu-metal core high turns-ratio transformer. This gives a low output impedance while employing only anode loaded gain stages.
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It is exactly as you said it. the Constant Current Source, strives to maintain the Constant Current, by varying the Voltage across its ends. In accordance with the signal.
BTW, I am not even a single E 😀
High-End preamp with 6DJ8
Hi guys!
Here's the complete quality schematic with ECC88, 6DJ8, 6922 etc.
Enjoy!
Hi guys!
Here's the complete quality schematic with ECC88, 6DJ8, 6922 etc.
Enjoy!
Nothing "high-end" that I can see. Just a poorly designed power supply and an amplifer that's not that great either. And the power LED circuit as drawn will destroy the 3.3V zener diode after a few switch on cycles. Also, unless they are specifically designed for it from a safety perspective, panel mounted LEDs should never have a direct connection to the mains supply.
the Broskie CCDA is still it for me....not this one....to many parts, too complicates.... doubtful it can deliver the goods....i failed to see where the high end is...
actually, it does look like an attempt to make his own version of your Broskie-CCDA copy
but Im not sure he have been listening
well, maybe I dont know either
but resistors appears to need some 'adjustment' to make it a CCDA
or they have been 'rearranged' a bit 😕
I'm assuming that Gost22 did not design this himself. Who did?
I'm getting tired of certain people on here frequently showing circuits which they are unlikely to have designed themselves (based on their previous posts), yet no author/designer is acknowledged in the post or on the circuit itself.
I'm getting tired of certain people on here frequently showing circuits which they are unlikely to have designed themselves (based on their previous posts), yet no author/designer is acknowledged in the post or on the circuit itself.
or 'playing'
well, somethimes you just have to remove traces of a curcuit's origin, to avoid offending the original constructor/designer 😀
well, somethimes you just have to remove traces of a curcuit's origin, to avoid offending the original constructor/designer 😀
On the bright side, it's a lousy enough design that it will have distortion sufficient to satisfy someone looking for "tube sound." 😀
Hi
I combined a little and got this pre-amplifier on schematic.
On schematic resistors 2k2 and 2k7 should be replaced with a 10k, cathode resistors of 120ohm to replace with resistors of 470ohm.
Capacitor of 680uF to expel.
And that's guys a good schematic anode for the preamplifier!
Cheers!
I combined a little and got this pre-amplifier on schematic.
On schematic resistors 2k2 and 2k7 should be replaced with a 10k, cathode resistors of 120ohm to replace with resistors of 470ohm.
Capacitor of 680uF to expel.
And that's guys a good schematic anode for the preamplifier!
Cheers!
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