Openai/696a8f9d-1d00-8006-85fb-a354664803a2

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User: on the attached image from a Snell A series speaker, a screw cap electrical assembly is not working as a result of the …

on the attached image from a Snell A series speaker, a screw cap electrical assembly is not working as a result of the internals being stripped and thus I have no subwoofer sound due to the cylindrical fuse not making contact between both ends. Is it possible to remove the assembly and install a new one? What would a typical part or part number be?

Assistant: Yes — it is absolutely possible to remove and replace that assembly, and this is a known service issue on Snell Type A …

Yes — it is absolutely possible to remove and replace that assembly, and this is a known service issue on Snell Type A / A-series speakers.

What you’re looking at is not just a fuse holder, but a panel-mount screw-cap fuse holder used as a mode selector and protection device.

What that part does (and why you lost woofer output)

On the Snell A series:

• The cylindrical fuse completes the circuit for the woofer network
• The threaded cap and internal spring contact apply pressure so the fuse bridges both terminals
• When the threads strip or the internal spring collapses, the fuse no longer makes electrical contact ➡️ Result: woofer is completely out, even though the driver itself is fine

This is exactly consistent with your symptom.

Can it be replaced?

Yes. The fuse holder is not potted and is mounted through the rear panel with a retaining nut on the inside.

Removal process (high level)

1. Remove woofer to access inside of cabinet
2. Desolder the two leads from the fuse holder
3. Remove the internal retaining nut
4. Slide the fuse holder out from the rear panel
5. Install replacement and re-solder

⚠️ No crossover tuning components are affected — this does not interfere with Snell’s hand-matched crossover adjustment.

What is the replacement part?

Snell did not use a proprietary part. This is a standard panel-mount AGC/3AG fuse holder.

Correct specification

• Fuse type: AGC / 3AG (¼" × 1¼")
• Mounting: Panel-mount, threaded body
• Cap: Screw-cap with spring contact
• Current rating: ≥10A (15A is fine)
• Voltage rating: ≥125V
• Material: Phenolic or nylon body (metal cap preferred)

Common equivalent parts (modern)

You do not need an original Snell part.

Examples:

• Littelfuse 03453 series panel-mount AGC holder
• Keystone Electronics 3557 / 3559
• Eaton / Bussmann HTB-34I
• Generic “Panel Mount 3AG Fuse Holder, Screw Cap”

These are widely available from Mouser, Digi-Key, Newark, etc.

What NOT to do

• ❌ Do not bypass the fuse permanently
• ❌ Do not use a glass fuse without proper spring pressure
• ❌ Do not overtighten the cap (this is what strips them)

Fuse value reminder (important)

Snell typically specified:

• AGC 3A slow-blow (varies by revision)

If you want, I can:

• Confirm exact fuse value for your serial range (#1161)
• Recommend the closest cosmetically matching holder
• Walk you through a step-by-step replacement procedure

Just say the word.