Hi all!
What is the best of these tube/valve 6922, ECC88, E88CC or 6DJ8?😕
The question now ECC88 or PCC88?🙁
thank you!
What is the best of these tube/valve 6922, ECC88, E88CC or 6DJ8?😕
The question now ECC88 or PCC88?🙁
thank you!
The best is E188CC, but it is expensive.
6922 = E88CC and ECC88=6DJ8. ECC88 is better than E88CC because it is less microphonic, but the maximum plate voltage is lower.
PCC88 is not a direct equivalent, as it must be heated at a *constant current* of 300mA.
6922 = E88CC and ECC88=6DJ8. ECC88 is better than E88CC because it is less microphonic, but the maximum plate voltage is lower.
PCC88 is not a direct equivalent, as it must be heated at a *constant current* of 300mA.
No. Only the current is constant. The voltage (AC or DC) depends on each specific tube and can vary.
Hi,
I know that the voltage of this heat tube is 2x7,6V or 15.2V. It can be AC or DC-voltage!
Greeting!
Wrong information. The tube has two filament paralelled. Also they come from the same manufacturing line. The only difference is that the PCC88 comes "as is", so there might be larger difference between the two sections than for the ECC88. The two sections of the ECC88 are burned at the factory until they are equal (I think they measure S or gm). Also the PCC version is intended for TV sets that typically used all tubes in series.
I have not heard that before. Note that it is the E88CC which is the industrial/special version, but this is not just a selected or burned-in ECC88 as they have different heater current.oshifis said:
My limited experience with the E88CC/6922 indicates it is a small step up at most in quality from a bogey ECC88/6DJ8 for audio applications. (For European NOS, or good used vintage samples, modern production not sure whether one is consistently better than the other.) The Russian 6N23P-EV is quite good and inexpensive last time I checked.
Something that seems to be an issue, is that 6H23Π and ECC88 are not really interchangeable.
On the left, 6H23Π. On the right, ECC88. Ub = 165V, RA = 22kΩ, VA=105V, VG=-2,5 V
But Ia=6mA for the 6H23Π, 4,5 mA for the ECC88
They re not that far apart, but it ruins things for LED bias i guess....
On the left, 6H23Π. On the right, ECC88. Ub = 165V, RA = 22kΩ, VA=105V, VG=-2,5 V
But Ia=6mA for the 6H23Π, 4,5 mA for the ECC88
They re not that far apart, but it ruins things for LED bias i guess....
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4.5mA vs 6mA at the same bias point is within the bounds of normal sample variation. However, as you say, LED bias will not compensate for this. A cathode resistor would, partly.
I have used a 6n23p as an input tube in a 6922 mu follower preamp, I liked it a lot. Not sure what the bias point was though, it was a commercial preamp. The 6n23p was recommended as a low cost upgrade by the manufacturer vs. the current production tubes the pre came with.
Hows about a 6n1-EV. I use them as a driver for my 5881 SET amp ... mmmm marvy when I went from 6L6GC to RCA 5881 wow ....big sound all around.
Whats the application?
Cheers,
Bob
Whats the application?
Cheers,
Bob
Hi guys!
Somehow I entered in a lack of clarity around the existing differences between PCC88 and ECC88?!
Let's please correct that define the difference between these two tube/valve.
If someone has a good schematic for buffer with ECC88 or PCC88.
The buffer we need to raise it to the output CD-player Technics and input stereo amplifier with LM1875.
Thank you!
Somehow I entered in a lack of clarity around the existing differences between PCC88 and ECC88?!
Let's please correct that define the difference between these two tube/valve.
If someone has a good schematic for buffer with ECC88 or PCC88.
The buffer we need to raise it to the output CD-player Technics and input stereo amplifier with LM1875.
Thank you!
Why do you need a buffer? Are your cables particularly long, or does the LM1875 have a particularly low or non-linear input impedance and/or the CD player have a particularly high or non-linear output impedance?
Pretty much all tubes make for good cathode followers to drive a chipamp so just use whatever you have on hand.
I would pick 6DJ8 because it is known to be very quiet (though so are a lot of tubes).
Another option is 12BH7, because I have tried it and it sounds great.
I would pick 6DJ8 because it is known to be very quiet (though so are a lot of tubes).
Another option is 12BH7, because I have tried it and it sounds great.
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I was afraid you might say that. Take a variable mu valve and run it as a cathode follower at an inappropriate bias point from far too low a supply rail voltage. That will give you what some people (wrongly) regard as 'tube sound'. Or buy a ready-made one on ebay from some Chinese gentleman.Gost22 said:
Using a cathode follower with any high mu tube such as 6DJ8 should give you a more euphonic, organic sound while retaining that quickness. I'm assuming you're not after the slow "tubey" sound. You want something that sounds more like a 45 and less like a underdriven 300B, yes?
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