How closely match is this double triodes in a single ECC84/6N14P at audio frequency? Datasheet mention about mismatch in capacitance between both triodes. But in audio frequency, does this matter? I've build a stereo cathode follower using this tube and both channel sounds the same to my ear. There's hardly any audio circuit published on this tube.
Thanks for your answer. In your opinion why this tube is so unpopular to be use as a stereo unit? It is claimed to be low noise and high bandwidth.
ECC84: this tube is a nice one and with good linearity. better than most common ECCxx types. so, why they dont use it? dont know, and its not so easy to find. i tried to get some, but ran into problems
Hi!
How about the ECC804? Is it equivalent to ECC84? I have some ECC804 and i would like to use them for audio. I made some tests,and the sound is good.
Silvino
How about the ECC804? Is it equivalent to ECC84? I have some ECC804 and i would like to use them for audio. I made some tests,and the sound is good.
Silvino
the ECC804 is a quite rare tube. it is ok to use in audio as well. its difficult to get more data than the basics right now. produced was it by Brimar and Telefunken, as i remember.
I mean this one. 6N14P - Wikipedia, the free encyclopedia
By googling, most of the applications for ECC84 is in FM and SRPP because this tube are design for cascode. But I'm interested to use it as a stereo pair.
By googling, most of the applications for ECC84 is in FM and SRPP because this tube are design for cascode. But I'm interested to use it as a stereo pair.
Yes the 6N14P is a very close substitute to the ECC84, danzup is confusing it with the 6P14P, which is an EL84 substitute.
I'm currently playing with it, I bought ten of them cheaply on Ebay. It seems to be just fine for audio, with nice characteristics at lowish voltage. Only one thing should be kept in mind: there's a screen between the sections, which is connected to the grid of the section 1. This is intended to be used as a grounded-grid section, as the upper tube in a cascode. For audio, I do not expect any problems with this though.
I'm currently playing with it, I bought ten of them cheaply on Ebay. It seems to be just fine for audio, with nice characteristics at lowish voltage. Only one thing should be kept in mind: there's a screen between the sections, which is connected to the grid of the section 1. This is intended to be used as a grounded-grid section, as the upper tube in a cascode. For audio, I do not expect any problems with this though.
Which characteristic that you like at low voltage?
I'm currently using 40V for B+ at 1.5mA in cathode follower configuration. From the datasheet, the operation region is not so linear but the sound is quite acceptable. Can you share your implementation?
I'm currently using 40V for B+ at 1.5mA in cathode follower configuration. From the datasheet, the operation region is not so linear but the sound is quite acceptable. Can you share your implementation?
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according to the graphs, the ECC84 is not exactly a 6N14p, looks more linear.... if the graph was taken carefully
I'm trying it in a differential amplifier with CCS anode loads. For it to become linear, it needs a bit more current. This goes for many RF tubes. My target operating point is 80V and 6 mA per section.
Oh, your meaning of low voltage is not as low as what I think. At that voltage is should be quite linear.
For common cathode/ diff pair, the miller effect will amplify the parasitic capacitance difference between both triode. The mismatch will become worse with higher gain. No effect in audio?
For common cathode/ diff pair, the miller effect will amplify the parasitic capacitance difference between both triode. The mismatch will become worse with higher gain. No effect in audio?
Nothing that cannot be compensated relatively easily should there be a real need for it. The capacitance at the inverting input should be compensated for anyhow in the feedback network, with that in place I don't see a problem in the capacitance mismatch, as the tube's impedance is rather low at its nominal operating point.
The ECC804 is quite common in Europe, often under its alternative name 6/30L2. All the ones I have seen in the UK were made by Mazda/Brimar, whatever brand they are marked with. It is nothing like the ECC84. The ECC804 was designed for use as a timebase oscillator in TV sets, so it often turns up in boxes of assorted 300mA TV valves.
There is not much data for ECC804 on the web. It has similar characteristics to ECC82 and 6CG7. It can substitute for 6CG7 in some low current circuits but it is not an equivalent as it has higher transconductance, and much smaller anodes so can dissipate much less power. Some dealers sell a 'Mazda 6CG7' which looks very similar to ECC804, and very different from other 6CG7.
There is not much data for ECC804 on the web. It has similar characteristics to ECC82 and 6CG7. It can substitute for 6CG7 in some low current circuits but it is not an equivalent as it has higher transconductance, and much smaller anodes so can dissipate much less power. Some dealers sell a 'Mazda 6CG7' which looks very similar to ECC804, and very different from other 6CG7.
Hi !
The ECC804 i have ,are EDICRON made in LONDON acording to the box, and i bought them in Lisbon for 5 Euros Each!
Silvino
The ECC804 i have ,are EDICRON made in LONDON acording to the box, and i bought them in Lisbon for 5 Euros Each!
Silvino
Edicron is a UK rebrander, not a manufacturer. However, it is quite likely that your valves were made in or near London as the STC/Brimar/Mazda factories were near London.
ECC84 opinions of the sound: dull, unpleasant, grainy, glassy with the coloration
I read many times similar opinions
but not tested them by myself
I read many times similar opinions
but not tested them by myself
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