Tube with Power IC Output Stage - JLTi

[Franz G]

Re: ECC86; running it at a +/- 35 rail is already rather "high voltage" for this valve. It was designed to run from low voltage car battery supplies.

Did I wrote +/-35V for ECC86? Of course to high, max +/- 15V!

Ahh, I see: I asked about a E88CC and +/- 35V.

Sorry
Franz

[fdegrove]

Hi,

Did I wrote +/-35V for ECC86? Of course to high, max +/- 15V!

I just thought I'd mention it before someone just drops in a ECC86 en lieu of the ECC88 and say they don't like what they're hearing based on those findings.

Personally I don't really like low voltage valves but that's another story....

Here's some data on the ECC86/6GM8:

ECC86

Cheers,

[carlosfm]

Originally posted by Franz G
Wrong, dear Carlos!

The difference between input and output must be within 37V.The chip itself is floating and independent of the voltage.

You could even use LM1083.

Franz

Yes, you are right.
This sentence on the datasheet confused me:
"The LM117 series of adjustable 3-terminal positive voltage
regulators is capable of supplying in excess of 1.5A over a
1.2V to 37V output range."

[Franz G]

This sentence on the datasheet confused me:

Carlos: I always feel the same about datasheets: I read them 100 times (at toilet, in the bed, watching tv and so on).

And I think: Yes, you got it, Franz.

But then, I try a new circuit. And I get a problem. Then I read the datasheet again:

The first sentence gives the solution

This is the hard way, to learn.

What is more important? The goal or the way? (Konfuzius, isn't it?).

Franz

[planet10]

Originally posted by Franz G
I read them 100 times (at toilet ...

Around here we call that the library...

dave

[Franz G]

Actually, I am not sure, if the version with the low voltage ECC86 or the version with higher voltage E88CC is sounding better.

I just feel, it is the E88CC, I am not total convinced about the ECC86 solution. Some dynamics missing?

Soon, I will have the chance, to compare both versions: I have an order to build and sell one VBIGC, so I produced two boards.

The number two of this boards is now playing with the ECC86. The second board, number one (for the customer) will include an E88CC with adequate voltage.

Then, I will have the chance to compare both amps.

I will inform here.

Franz

[carlosfm]

Originally posted by Franz G
Carlos: I always feel the same about datasheets: I read them 100 times (at toilet...)

Originally posted by planet10
Around here we call that the library...

You guys should try to read the DIR1703 datasheet.
Hard to follow, even in the library.
The guy that wrote it didn't even know how to talk.
It must have been the same engineer that developed the chip, as it had a bug and TI removed them, not available anymore.

[Franz G]

... good, we have a forum.

We will squetch it out. The ultimate solution!

Franz

[Upupa Epops]

Franz, f... off 86 - it is much more nonlinear than 88, so you get only bigger distortion .

[Franz G]

Franz, **** off 86 - it is much more nonlinear than 88, so you get only bigger distortion

Sorry, I removed the censored part of your text

It must be this way: actually (with ECC86), La Traviata, does sound like through fog...

Franz

Edit: I just removed the ECC86 and put in the E88CC with only +/-11V.

Result: much more dynamics, at least. The fog is gone. And it does work!?! Amazing, isn't it? But I will of course go back to a adequate Ub (+/-50V to +/- 60V) for the E88CC.