I’m looking to start a discussion on this topic as the only info I’ve read on this are from instrument maker’s websites. (I’ve also watched 1 video where someone compared 2 identical lead pipes drawn vs seamed).

Here are my thoughts/knowledge on the subject, where I’d love to be challenged or agreed upon:

Drawn: a more basic sound, More resonant, More responsive, more consistent, less control of dynamics.

Seamed: a more complex sound, Less resonant, less responsive, less consistent, more control of dynamics.

If you want a ridiculous read, Google: characteristics of seamed leadpipes for trombones. The AI generated descriptions are actually in some cases, rather funny.

Bumping this, I’d like to know too as i’m starting to experiment with lead pipes!

I’ve been on a pretty crazy (and expensive) leadpipe experiment this year, and here are some thoughts after playing a ton of pipes in different contexts:

Drawn: The sound is less complex and they’re less responsive than seamed pipes, but that can be a strength as they’re easier to control. Dynamics feel narrower, but also more predictable, which makes them easier to manage. Because they “do less,” they often resonate (in the purest sense of the word) more consistently.

Seamed: These sound better to me in almost every way — wider, more bloom, richer colors. But they’re harder to control, often too responsive and sensitive. They offer a huge palette of dynamics and tonal options, but sometimes you just need something simpler to keep things focused and effective.

In my experience, seamed pipes also tend to “tap out” at certain volumes. Within their sweet spot they shine, but at extreme dynamics they can lose effectiveness. Especially so for higher copper alloys which can sound muddy at softs and edgy at highs.

It’s worth noting that my experiments have been with small bore leadpipes, not large bore. The design and playing approach for these horns can be very different, especially in the modern era.

We have found the following through our experience listening to many of our customers playtest our leadpipes. Obviously this is subjective and every player will experience this differently.

Seamed: more core, very resonant (not wide or big, but powerful), rounder articulations and tends toward the darker side of the sound spectrum. Best when paired with nickel silver receivers to boost the high end overtones.

Drawn: straight down the middle, more high end overtones with clean articulations.

[quote="baBposaune"]If you want a ridiculous read, Google: characteristics of seamed leadpipes for trombones. The AI generated descriptions are actually in some cases, rather funny.[/quote]
I used Copilot and I got a pretty good answer. The "AI" answers are constantly changing, hard to judge but I do notice the more you know about a subject the more wrong it appears.

Seamed leadpipes for trombones are a niche but significant feature in brass instrument design, especially among players who value craftsmanship and tonal nuance. Here are the key characteristics and implications of seamed leadpipes:

1. Construction Method

Seamed vs. Seamless: A seamed leadpipe is made by rolling a flat sheet of metal into a tube and soldering the seam, whereas a seamless leadpipe is drawn from a single piece of tubing.

Material Control: Seamed construction allows for more precise control over wall thickness and taper, which can influence response and tone.

2. Acoustic Characteristics

Enhanced Resonance: Some players report that seamed leadpipes offer a more complex, resonant sound due to subtle differences in how vibrations travel along the seam.

Focused Tone: The seam may slightly stiffen the pipe, contributing to a more centered and focused tone, especially in higher registers.

Response: Seamed leadpipes can offer quicker response and articulation, particularly beneficial for solo or orchestral playing.

3. Craftsmanship and Customization

Handmade Appeal: Seamed leadpipes are often associated with boutique or custom trombone makers, emphasizing artisanal quality.

Taper Customization: Builders can more easily experiment with different tapers and dimensions, allowing for tailored playing characteristics.

4. Durability and Maintenance

Potential Weak Points: The soldered seam can be a point of vulnerability if not well-crafted, possibly affecting longevity or requiring repair.

Corrosion Risk: If moisture gets into the seam, it may lead to internal corrosion over time, especially in poorly maintained instruments.

5. Player Preference

Subjective Experience: Some players swear by the tonal richness and response of seamed leadpipes, while others prefer the consistency of seamless designs.

Genre Suitability: Often favored in classical and solo settings where tonal color and nuance are prioritized.

You're right, there is a lot of "information" in there which is highly misleading, at best, and completely wrong, at worst.

[quote="OMalleyBrassInstruments"]We have found the following through our experience listening to many of our customers playtest our leadpipes. Obviously this is subjective and every player will experience this differently.

Seamed: more core, very resonant (not wide or big, but powerful), rounder articulations and tends toward the darker side of the sound spectrum. Best when paired with nickel silver receivers to boost the high end overtones.

Drawn: straight down the middle, more high end overtones with clean articulations.[/quote]

Pretty much my experience with pipes of several different makers (seamed vs drawn in identical size pipes) in a couple different brands of bass trombones.

[quote="RJMason"]Seamed: These sound better to me in almost every way — wider, more bloom, richer colors. But they’re harder to control, often too responsive and sensitive.[/quote]

Interesting. I just had a shoot out between my seamed & drawn pipes of similar sizes and I preferred the drawn in almost every way. The drawn pipe seemed to ring more and have more overtones, therefore a more appealing sound to me. The seamed pipe was more complex but lacked some ring and lacked some higher overtones.

[quote="BrianJohnston"]

Interesting. I just had a shoot out between my seamed & drawn pipes of similar sizes and I preferred the drawn in almost every way. The drawn pipe seemed to ring more and have more overtones, therefore a more appealing sound to me. The seamed pipe was more complex but lacked some ring and lacked some higher overtones.[/quote]

At first I loved the seamed pipes for their color and complexity, but in practice I have gone back to a drawn pipe. It is clearer and simpler. Both are great, but think we’re in agreement.