The Heart of the 100-Watt Plexi Sound

Unleash the full power of your Marshall with the Genuine Dagnall C1998 Output Transformer (Part# TXOP-00021) — the same transformer used in the legendary Marshall 1959HW Handwired Plexi. Handcrafted to Marshall’s original specifications by Dagnall, this transformer delivers the authority, headroom, and harmonic richness that defined the sound of classic 100-watt Marshalls. Tight low end, singing highs, and that unmistakable Plexi roar — this is the transformer that built rock.

Key Features

• Genuine Marshall / Dagnall Part – Factory-engineered 100W output transformer for the 1959HW Plexi Head.

• Model: Dagnall C1998 – The iconic 100W iron used in Super Lead and Plexi circuits.

• Part Number: TXOP-00021.

• Authentic Power & Tone – Delivers massive headroom, punchy mids, and rich harmonic overdrive.

• Vintage-Accurate Design – Wound to original Dagnall specifications for true Plexi tone and response.

• Factory-Spec Construction – Built for longevity and tonal consistency in high-output applications.

Compatibility

✔ Marshall 1959HW Handwired Plexi Head
✔ Other 100W Marshall reissue heads using the Dagnall C1998 transformer
✔ Direct OEM replacement for TXOP-00021 models

Specifications

• Marshall Part Number: TXOP-00021

• Transformer Model: Dagnall C1998

• Power Rating: 100 Watts

• Type: Output Transformer

• Application: Output stage transformer for 1959HW and other 100W Plexi amplifiers

Important Notes

⚠ Professional Installation Required – Must be installed by a qualified amplifier technician.
⚠ Non-Refundable – Electrical component; all sales are final.
⚠ Pre-Order Information – If listed as pre-order, email sales@britishaudio.com for availability and lead times.

Need Installation Assistance?

If you’d like British Audio to professionally install this transformer, please reach out to our service team at repair@britishaudio.com or complete our Repair Request Form.

Why Choose British Audio?

At British Audio, we’re Nashville’s trusted source for Marshall parts and service. As an Authorized Marshall Service Provider, we stock genuine Dagnall-built transformers and factory components to keep your amp performing with authentic tone and reliability.

Restore the power and authority of your Marshall 1959HW — order your Genuine Dagnall C1998 Output Transformer (Part# TXOP-00021) today!