5687 v.s. 6922 preamp/xover

[mashaffer]

For hifi preamp and crossover service with emphasis on low Zout, noise and microphonics which of these tubes (or similarly priced tubes) do you fancy and why. Assume 12.6v filiment xformer so 6922 tubes will have to be series heaters.

mike

[Shoog]

My small experience is that the 5687 is superior in sound to the ECC88. However the 5687 is slightly more demanding of setup with regard to hum. I have seen a few people tearing their hair out trying to solve hum problems with the 5687.

Hope that helps.

Shoog

[dsavitsk]

Originally posted by mashaffer
For hifi preamp and crossover service with emphasis on low Zout, noise and microphonics which of these tubes (or similarly priced tubes) do you fancy and why. Assume 12.6v filiment xformer so 6922 tubes will have to be series heaters.

I have become less and less enamored with the sound of the 5687 of late. They are generally better than a cheap 6dj8, but maybe not as good as a good one? Maybe I've only tried cheap ones.

Anyhow, another tube to look into is the 8416. It is a 6922 with a 12V heater. As far as I can tell, the only available model is an Amperex which is the bomb. T think they compare to Amperex tubes that can cost upward of $150 per. I just bought 3 for $10.

Ode to the 8416

Other benefit is that the pinout is more generic, so you can experiment a bit more.

Oh, another one to try might be the 12AT7 -- see Tubelab's SimpleSE for more.

[DougL]

For hifi preamp and crossover service with emphasis on low Zout, noise and microphonics which of these tubes (or similarly priced tubes) do you fancy and why.

I believe that this is circuit dependant. For CF or White CF service, the 6922 is excellent. For common cathode operation, the 5687 may be a better choice. Can you give us a better idea of the circuit?

Doug

[Shoog]

I have become less and less enamored with the sound of the 5687 of late. They are generally better than a cheap 6dj8, but maybe not as good as a good one? Maybe I've only tried cheap ones.

What are you starting to dislike? I'am just about to use a 5687 as an interstage transformer driver - i'am curious on your thoughts.

Shoog

[dsavitsk]

Originally posted by Shoog


What are you starting to dislike? I'am just about to use a 5687 as an interstage transformer driver - i'am curious on your thoughts.

Shoog

The ones I have, and I am comparing them against a pair of WE 417A's which is probably totally unfair, seem to lack the liquid/detailed midrange of some other tubes. But, as I say, the ones I have are cheapies (1986 manufacture JAN's) which may account for this. I also have some 1950's CSF's (http://thetubestore.com/nos-5687.html) which are better, but I have not spent enough time with them to see how much better they are. They still aren't as nice as the 417A's.

[Shoog]

I've heard them described as "dark" sounding, which would probably equate to lack of midrange sparkle. I found them very punchy, which is just what I need for my application.

Shoog

[cotdt]

for such an application, wouldn't it be better to use opamps?

[dsavitsk]

Originally posted by cotdt
for such an application, wouldn't it be better to use opamps?

Are you trying to get yourself banned?

[cotdt]

Originally posted by dsavitsk


Are you trying to get yourself banned?

what kind of question is that? i'm just posting my honest opinion, which is that opamps are quieter and better for this application.