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Old 23rd July 2004, 06:36 PM   #1
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Default Which preamp to choose for my ECC88s?

Hello,
I've been thinking about making a tube preamp (among the half-million of things in the "to-do" queue), and the only thing that refrained me from building one was the absence of remote control.
Now that I got some ALPS blue motorized potentiometers (50k) I have no more excuses

I've seen two circuits that might fit, the Supertotem from Filippo22's site (here) and the TNT Simpre....

What would you choose? Should I go for the simplest first?
Alternative proposals?

Cheers

Andrea
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Old 23rd July 2004, 07:04 PM   #2
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Hi!

Just my opinion, there are better tubes than the 6922 for building a buffered volume control line stage. The NOS 5687 and the current production ECC99 are 2 examples.

OTOH, the 6922 is excellent in a phono stage, as it's very quiet.
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Old 23rd July 2004, 11:06 PM   #3
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Ciao Andrea,

Eli is quite right in saying there are much better valves out there for preamp service than the ECC88s.

If you don't know what to use the ECC88s for and happen to have a fair number of them, then sure, you could build a preamp with them.

While I had looked at this so called "Supertotem" variation on an SRPP before, I'm still as unimpressed with it as before.
Why use valves in // when there's absolutely no need for it? What's so special about this circuit that it justifies rebaptising the trusty old SRPP_ in itself a gross misnomer anyway_??
Surely it can sound fine but like all other SRPP variations it's heavily dependent on the quality of the PS.

If you want me to, I could easily come up with a good sounding preamp design using the ECC88 and the 50K ALPS pots. Just let us know what the orderbook looks like....

Ciao,

Frank.
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Old 23rd July 2004, 11:19 PM   #4
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Quote:
Originally posted by Eli Duttman

The NOS 5687 and the current production ECC99 are 2 examples.
Indeed, but is an ECC99 not is bit overdone?

BTW how does the ECC99 compare to the good old 12BH7? Any thoughts or better experience?

I am thinking of replacing my 12BH7ís for ECC99ís in a line-driver stage. Is it worth the effort (and money)?

Cheers
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Old 23rd July 2004, 11:22 PM   #5
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Default Re: Which preamp to choose for my ECC88s?

Konnichiwa,

Quote:
Originally posted by Andypairo
I've seen two circuits that might fit, the Supertotem from Filippo22's site and the TNT Simpre....

What would you choose?
Arthur Loesch PSE Linestage if it was for me personally and I'd have to use ECC88, otherwise Supertotem minimal (eleiminate all unneccsary resistors and solve oscillation issues with ferrite beads and/or layout).

Sayonara
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Old 24th July 2004, 12:12 AM   #6
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Hi,

Pjotr,

Quote:
I am thinking of replacing my 12BH7ís for ECC99ís in a line-driver stage. Is it worth the effort (and money)?
Given that both types retail for about the same price nowadays in the EU the ECC99 is to be the prefered type.
It has the better specs of the two:

JJ ECC99

Quote:
(eleiminate all unneccsary resistors and solve oscillation issues with ferrite beads and/or layout).
Which would be R3, 4, 5 I suppose....
One word of caution while using ferrite beads: use them as close to the grids as possible and glue them into place. Wandering beads is not what you'd want.
Having an o-scope while sorting out oscillatory problems with notorious self-oscillating tubes a la 6C45-P, 6922 and such is a must IMO.

R1, 2, 6, 7 could be replaced with 2 * 550R 1W resistors as well....
After all this surgery the circuit could then again be rebaptised calling it RAPP, as in Regulated Anode Push-Pull, which is what France based Audiomat calls theirs...Nothing new under the sun.


Cheers,
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Old 24th July 2004, 03:36 AM   #7
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Default 12BH7 vs. ECC99

Something to consider is the difference in mu between the 12BH7 and the ECC99, when common cathode circuitry is employed.

IMO, the ECC99 is the clear choice for cathode follower service, given its high gm.

BTW, don't forget the 6GU7. It's a "6" V. only heater type that's otherwise electrically equivalent to the 12BH7. Jim McShane's price for 6GU7s is 5 USD.

Jim McShane's Site: http://pages.prodigy.net/jimmcshane/
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Old 24th July 2004, 06:37 AM   #8
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Default Re: Re: Which preamp to choose for my ECC88s?

Quote:
Originally posted by Kuei Yang Wang
Konnichiwa,

Arthur Loesch PSE Linestage if it was for me personally and I'd have to use ECC88, otherwise Supertotem minimal (eleiminate all unneccsary resistors and solve oscillation issues with ferrite beads and/or layout).

Sayonara
Hello,
where can I find this circuit?
Cheers

Andrea
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Old 24th July 2004, 07:09 AM   #9
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Quote:
Originally posted by Eli Duttman
Hi!

Just my opinion, there are better tubes than the 6922 for building a buffered volume control line stage. The NOS 5687 and the current production ECC99 are 2 examples.

OTOH, the 6922 is excellent in a phono stage, as it's very quiet.
Hello Eli,
I have 8 Mullard NOS ECC88, and thought they could be a good candidate for a preamp, but it seems they are not "ideal" altough they can certainly work.

About the phono.. no phono no party!


Quote:
Originally posted by fdegrove
Ciao Andrea,

Eli is quite right in saying there are much better valves out there for preamp service than the ECC88s.

........

If you want me to, I could easily come up with a good sounding preamp design using the ECC88 and the 50K ALPS pots. Just let us know what the orderbook looks like....

Ciao,

Frank.
Ciao Frank,
I understand. What if I can get hold of 2*E82CC (how do they compare with the 5687=182CC ?) and 2* E83CC ?

And Yes, I'd gladly see your proposal for a (line) preamp with the parts I have.

Currently the schedule is:

1- Finish the tube buffered gainclone (1* Ecc88 gone)
2- Build the MOX crossover
3- Fit the P3A built long ago in a case
4- Build a tube preamp
5- Build a second TDA1541A dac with tube out.
I take the occasion to thank Pedja, Elso and Thorsten that made the 1st DAc (and also the second) possible.


Cheers

Andrea
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Old 24th July 2004, 09:42 PM   #10
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Default Re: Re: Re: Which preamp to choose for my ECC88s?

Konnichiwa,

Quote:
Originally posted by Andypairo
where can I find this circuit?
http://www.fortunecity.com/rivendell...occatamk1.html

http://www.fortunecity.com/rivendell...a/Toccata.html

The original schematic used to float around the net but seems unavailable now. I'll e-mail it over to you if you mail me.

Sayonara
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