Tube Behavior - ECC823 Thread:

[syscokid]

Mhmm, this guy seems to be listening with his legs, doesn't he?

That's why he's wearing shorts.

 

[bea]

That's why he's wearing shorts.

Ah, i understand. His leg hair receives the sound by vibration and that's transmitted to the brain ...

 

[Inspector #20]

Mhmm, this guy seems to be listening with his legs, doesn't he?

LOL yes!

 

[67plexi]

John's amp mod has no mid-range sounds thin.

This is a gut shot of one of Larry's amps in the video.

 

[Inspector #20]

John's amp mod has no mid-range sounds thin.

This is a gut shot of one of Larry's amps in the video.

View attachment 21280

Whoa!

 

[Goldmember]

Many thanks to Goldmember for his tube suggestions. It worked out really good last night. the first time the DSL40C has sounded that clear, loud and defined...

Robert, you could even try a 5751 in V3, just to see the effect.

 

[Inspector #20]

Robert, you could even try a 5751 in V3, just to see the effect.

Yes! Please send one immediately!

 

[syscokid]

Robert, you could even try a 5751 in V3, just to see the effect.

What does V3 affect in the DSL40C's circuit?

 

[Inspector #20]

What does V3 affect in the DSL40C's circuit?

V3 is the final gain stage and cathode follower

 

[Inspector #20]

Robert, you could even try a 5751 in V3, just to see the effect.

I have read to avoid the 5751 in the V3 position????

 

[bea]

I wrote "with the exception of a JJ 5751" because of the larger voltage permissible between heater and cathode. The JJ can withstand 180V, all the others 90V, which may be exceeded in a cathode follower.

 

[Inspector #20]

I wrote "with the exception of a JJ 5751" because of the larger voltage permissible between heater and cathode. The JJ can withstand 180V, all the others 90V, which may be exceeded in a cathode follower.

That 5751 sounds like a tough tube!

 

[Inspector #20]

Maybe I should try this:

V1 - ECC823

V2 - JJ-5751

V3 - JJ-5751

V4 - JJ-5751

Hmmm....I need more tubes!!! I have lots of TAD 7025WA's and Marshall branded ECC83S tubes, but no more 5751's.

@bea - I have (4) Ken-Rad Long Pewter Plate 12AX7's dated 1952.

Any good????

 

[Inspector #20]

Robert, you could even try a 5751 in V3, just to see the effect.

What would you expect to hear???

 

[Goldmember]

Hi Robert,

I've never had a chance to experiment with a DSL40, but the 5751 is a military grade replacement for the ecc83s, with less gain.
I would expect it to smooth the gain structure, like butter on a frickin pancake.
In V3? I don't know, but it certainly would not hurt to try it.

 

[Inspector #20]

Hi Robert,

I've never had a chance to experiment with a DSL40, but the 5751 is a military grade replacement for the ecc83s, with less gain.
I would expect it to smooth the gain structure, like butter on a frickin pancake.

You know, that's a very good description. Here's what I have noticed in your recommended ECC823/5751 V1/V2 swap.

The overall tone - even at ridiculous gain settings is smoother - and there is less white noise and less feedback tendency...

 

[Inspector #20]

@Goldmember @syscokid - look at where I am running this am now and less than 6 feet away from it...that was impossible before the tube swap.

 

[syscokid]

You know, that's a very good description. Here's what I have noticed in your recommended ECC823/5751 V1/V2 swap.

The overall tone - even at ridiculous gain settings is smoother - and there is less white noise and less feedback tendency...

But but but but but but.... Have you tried the ECC823 with a 12AX7 IN V2???? I just gots-to-know! Good? Bad? Oh The Hummanity...

 

[Inspector #20]

But but but but but but.... Have you tried the ECC823 with a 12AX7 IN V2???? I just gots-to-know! Good? Bad? Oh The Hummanity...

Not yet...I been swapping tubes and speakers so much I am getting worried about the screws and sockets!!!

I'm not sure I would trust these 1952 Ken-Rads!!!!

 

[syscokid]

Arrrrrgh! Tell Ken to go take a Hike! Any non-microphonic 12AX7/ECC83/7025 will do.

Lord... I'm having a Meltdown