Fiio Warmer upgrade

[Pokee1016]

I can attest to the fact that the FiioWarmer when tubes are replaced with a Quad of Amperex 6DJ8 is otherworldly.

 

[Svend P]

It is not really the kind of posts that are encouraged here on ASR. If it can't be measured, you are probably imagining it.

Audio Science Review FAQ #1

This is the first in a series of FAQs for Audio Science Review. 1. Who created Audio Science Review? The founder is Amir Majidimehr. You can find out more about me by clicking on my background link in my signature. Briefly, I have had a long career in computing, audio, video and imaging...

www.audiosciencereview.com

 

[spyne]

It is not really the kind of posts that are encouraged here on ASR. If it can't be measured, you are probably imagining it.

Are you saying it can't be measured without actually attempting to measure it?
Different tubes DO (sometimes) have different measurements, so what OP has posted is entirely possible.

 

[mhardy6647]

I think* (???) that the component in question may run its tubes at really weird operating points (e.g., low B+) far outside of those recommended.
As such (and if so), the tubes are operating way outside of their designers' and manufacturers' specifications, so, yeah... all bets are off, absent measurement.

RCA's specs for 6922 twin triode (essentially identical to the 6DJ8, ECC88, E88CC, and 7408 types)
______________
* I.e., I have read on the internet

 

[Pokee1016]

Are you saying it can't be measured without actually attempting to measure it?
Different tubes DO (sometimes) have different measurements, so what OP has posted is entirely possible.

Let’s not forget actual sound vs. measurements. I know what I’m hearing with 40 years in the industry designing SS and Tube components I have done my share of “measurements”. At the end of the day it’s a tube output stage and there is room for improvement from the standard JJ ECC 88- it’s a great tube, very reliable. Looks like I’m up against guys without fully calibrated microphones and rugged opinions. Anyone else should give it a go. I wish you all a good journey measuring.

 

[Pokee1016]

It is not really the kind of posts that are encouraged here on ASR. If it can't be measured, you are probably imagining it.

Audio Science Review FAQ #1

This is the first in a series of FAQs for Audio Science Review. 1. Who created Audio Science Review? The founder is Amir Majidimehr. You can find out more about me by clicking on my background link in my signature. Briefly, I have had a long career in computing, audio, video and imaging...

www.audiosciencereview.com

I worked with Amir in 2006. Hello Amir! I’m impressed by what you have done and built. Good man!

 

[Pokee1016]

Are you saying it can't be measured without actually attempting to measure it?
Different tubes DO (sometimes) have different measurements, so what OP has posted is entirely possible.

An ECC88 or E88C are similar in all aspects to the 6DJ8 which is a superior tube. Not my first choice among twin triodes, but a great choice since they are available in matched quads NOS for a great price. They sound great in this unit. E88C, EC88, 6DJ8.

 

[Pokee1016]

I think* (???) that the component in question may run its tubes at really weird operating points (e.g., low B+) far outside of those recommended.
As such (and if so), the tubes are operating way outside of their designers' and manufacturers' specifications, so, yeah... all bets are off, absent measurement.
View attachment 515055
View attachment 515054
RCA's specs for 6922 twin triode (essentially identical to the 6DJ8, ECC88, E88CC, and 7408 types)
______________
* I.e., I have read on the internet

They DO run a lower B+. But the 6DJ8 is essentially within the parameters of the ECC88. Some people decide to run the plate at 80 volts or less for a cheaper power supply but Fiio’s voltage is sufficient. Current is the main issue but these tube designators point to what is essentially the same tube. An Amperex Haaland tube (made in Holland) is superior to any tube made today although the JJ, Gold Lion and especially boutique (based on production numbers) can be great.

 

[Pokee1016]

I think* (???) that the component in question may run its tubes at really weird operating points (e.g., low B+) far outside of those recommended.
As such (and if so), the tubes are operating way outside of their designers' and manufacturers' specifications, so, yeah... all bets are off, absent measurement.
View attachment 515055
View attachment 515054
RCA's specs for 6922 twin triode (essentially identical to the 6DJ8, ECC88, E88CC, and 7408 types)
______________
* I.e., I have read on the internet

They DO run a lower B+. But the 6DJ8 is essentially within the parameters of the ECC88. Some people decide to run the plate at 80 volts or less for a cheaper power supply but Fiio’s voltage is sufficient. Current is the main issue but these tube designators point to what is essentially the same tube. An Amperex Haaland tube (made in Holland) is superior to any tube made today although the JJ, Gold Lion and especially boutique (based on production numbers) can be great.

An ECC88, E88C or 6DJ8 is NOT a 12AX7 or 6922 in any way. Look at the gain structure. A 12AX7 is 90, a 12AU7 is 40.

 

[Pokee1016]

An ECC88, E88C or 6DJ8 is NOT a 12AX7 or 6922 in any way. Look at the gain structure. A 12AX7 is 90, a 12AU7 is 40.

Harleen

 

[mhardy6647]

Tube of the Month : The ECC88 / 6DJ8

Hi! This month I am presenting a 9 pin miniature (Noval) medium mu twin triode. Meet the ECC88: The ECC88 is one of the more popular tubes ...

vinylsavor.blogspot.com

None of which have anything to do with the 12AX7.

 

[Pokee1016]

Tube of the Month : The ECC88 / 6DJ8

Hi! This month I am presenting a 9 pin miniature (Noval) medium mu twin triode. Meet the ECC88: The ECC88 is one of the more popular tubes ...

vinylsavor.blogspot.com

None of which have anything to do with the 12AX7.

I am trying to emphasize that there are significant differences. On twin triode with similar specs and pinout is not a substitute for another. A 6DJ8 = an ECC88

 

[Pokee1016]

I am trying to emphasize that there are significant differences. On twin triode with similar specs and pinout is not a substitute for another. A 6DJ8 = an ECC88

 

[mhardy6647]

I am not sure of your point. ECC88, E88CC, 6DJ8, 7308, 6922 are all interoperable in (all, AFAIK) audio applications. They are not all identical -- although RCA, e.g., played somewhat fast and loose with the tube type designations they applied to the frame grid twin triodes -- especially late in the vacuum tube commodity market era.

A 12AX7 (or any of its kin) is a very different twin triode.

We're way in the weeds relative to the Fiio Warmer, though.

 

[Pokee1016]

Tube of the Month : The ECC88 / 6DJ8

Hi! This month I am presenting a 9 pin miniature (Noval) medium mu twin triode. Meet the ECC88: The ECC88 is one of the more popular tubes ...

vinylsavor.blogspot.com

None of which have anything to do with the 12AX7.

I’ve designed RIAA circuits i have designed preamplifiers for Mark Levinson and quite a few other companies and I have designed plenty of tube circuits. Using 12 AU 712 8712 AX7. The list goes on and on I know quite well wihat a 12AX7 is. I have built tube guitar amplifiers Home hi-fi gear, a
Mps, preamps, phono amps, speakers and much more, but I appreciate you pointing out that apparently I don’t know what I’m talking about. I was just trying to be helpful and offer an upgrade path and I still stand by it in fact, if you can get a NOS quad of 6DJ8’s I I highly recommend it.

 

[mhardy6647]

You don't write terribly clearly
You brought up the 12AX7, not I

An ECC88, E88C or 6DJ8 is NOT a 12AX7 or 6922 in any way. Look at the gain structure. A 12AX7 is 90, a 12AU7 is 40.

... and with that, enjoy your stay here!
ciao!