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RTM Analog Tapes

Discover Premium RTM Reel-to-Reel Audio Tapes

At Recording The Masters, our analog tape collection is engineered for the highest standards of sound recording. Whether you're producing music, archiving vintage material, or exploring the warmth of analog, our LPR35, LPR90, SM911, and SM900 tapes offer unmatched audio fidelity, durability, and consistency — trusted by professionals and audiophiles worldwide.

LPR35 – Long Play Analog Warmth

LPR35 is a long play (LP) ¼” analog tape based on the legendary SM911 formulation. It delivers rich, warm sound with low noise, making it perfect for home recording, mixtapes, and extended sessions. Its thinner base allows for more recording time while maintaining stability and performance.

Best for: Home studios, cassette duplication, and general analog enthusiasts.

LPR90 – High Output, Long Duration

LPR90 offers higher output levels and even greater dynamic range, built on the SM900 formulation. Ideal for demanding applications, it combines professional-grade performance with extended playtime, allowing for longer recording sessions without sacrificing audio integrity.

Best for: Mastering, high-output environments, and extended archiving.

SM911 – Studio Master Standard

SM911 is a professional-grade reel-to-reel tape designed for studio recording, mixing, and broadcast-quality production. With a wide frequency response, low print-through, and high saturation levels, SM911 is the trusted choice for achieving full, balanced analog recordings.

Best for: Recording studios, analog mastering, and pro audio engineers.

SM900 – Maximum Headroom, Maximum Clarity

SM900 is RTM’s high-output premium mastering tape. With superior signal-to-noise ratio, exceptional dynamic range, and low distortion, it is built for those who demand the most out of analog tape. It provides pristine playback quality even in the most complex sessions.

Best for: High-end mastering, critical recording, and analog perfectionists.

Experience the warmth, depth, and authenticity of true analog sound with RTM’s premium reel-to-reel tapes. Whether you're crafting new music or preserving timeless recordings, trust RTM to deliver the quality your audio deserves.

RTM Blank Cassettes & Players

RTM Audio Cassettes – C60 & C90

Rediscover analog sound with RTM’s premium blank audio cassettes – the C60 and C90. Designed for superior fidelity and long-lasting performance, these cassettes are ideal for music recording, mixtapes, spoken word, and archival projects. Whether you're a vintage audio enthusiast or a professional artist, RTM cassettes deliver authentic analog warmth with modern precision.

C60 Cassette – High Quality, Compact Format

The RTM C60 cassette provides up to 60 minutes of crisp analog audio (30 minutes per side). With a Type I ferric formulation, it offers excellent low-noise performance, warm tonal balance, and durable construction. It’s a perfect choice for EPs, interviews, demos, or curated mixtapes.

Best for: Mixtapes, short albums, podcast archives, and voice recordings.

C90 Cassette – Extended Play, Same Great Sound

The RTM C90 cassette offers 90 minutes of high-quality audio (45 minutes per side), perfect for full-length albums, DJ mixes, or long-form content. Like the C60, it features a high-grade Type I ferric tape, providing stable playback, rich analog tones, and reliable recording quality.

Best for: Albums, DJ sets, field recording, and creative sound projects.

RTM Walkman – Bring Analog Back to Life

Experience the charm of vintage sound with the RTM portable cassette player. Designed for cassette lovers, this stylish Walkman lets you enjoy your tapes anywhere with warm analog audio and a retro design. Perfect for reliving old memories or discovering the cassette culture for the first time. Compact, reliable, and easy to use analog never looked this good.

RTM Accessories

Enhance Your Analog Experience with RTM Accessories

At Recording The Masters, we offer a curated selection of high-quality accessories designed to complement and elevate your analog audio experience. Whether you're a seasoned professional, a passionate collector, or a newcomer to analog sound, our accessories provide the perfect tools to ensure optimal performance, longevity, and sound fidelity.

Precision Audio Maintenance

Maintain the integrity of your equipment and recordings with our selection of cleaning kits, leader tapes, and splicing tools. These essentials help you keep your tape machines and cassettes in peak condition, reducing wear and preserving audio clarity.

Empty Reels & Storage Solutions

Organize and protect your analog media with our range of Trident plastic reels, NAB metal reels, and storage boxes. Ideal for studio use or personal archives, these accessories are built for durability and aesthetic appeal.

Tape Handling Tools

Our calibration tapes, splicing blocks allow for smooth operation and accurate playback. These tools are especially valued in professional studios where precision matters most.

Optimized for RTM Tapes

Every RTM accessory is crafted to be fully compatible with our range of reel-to-reel tapes, blank cassettes, and duplicated formats, ensuring a seamless analog workflow from start to finish.

Trust RTM to support your passion for analog sound.

Our accessories are not just add-ons they’re essentials for anyone serious about high-fidelity recording and playback. Explore our collection and give your tapes the care they deserve.

General Questions

What is Recording The Masters?

Recording The Masters (RTM) is a leading manufacturer of high-quality analog audio tape, specializing in reel-to-reel tapes, cassette tapes, and professional recording media. Our products are designed for audiophiles, recording studios, and musicians who value superior analog sound.

Where are RTM tapes manufactured?

All RTM tapes are proudly manufactured in France, using high-performance materials and advanced production techniques to ensure exceptional analog sound quality and durability.

Who can use RTM analog tapes?

RTM tapes are designed for professionals, audiophiles, home recording enthusiasts, and archivists. Whether you're using a reel-to-reel tape recorder, cassette deck, or professional studio equipment, our products deliver superior analog performance.

Product Information

What types of analog tapes does RTM offer?

We offer a wide range of analog audio tapes, including:

  • Reel-to-reel tapes: SM911, SM900, LPR35, LPR90
  • Cassette tapes: High-quality blank cassettes for home and professional recording.
  • Archival tapes: Designed for long-term storage and preservation of audio recordings.

What are the differences between RTM tape models?

Each RTM tape model is optimized for specific recording needs:

  • SM911 – High-output, low-noise professional recording tape, ideal for studio use.
  • SM900 – Ultra-high-output studio tape with excellent dynamic range, perfect for professional multi-track recording.
  • LPR35 – Premium tape for home recording and professional applications.
  • LPR90 – High-performance long-play tape designed for extended recording sessions with outstanding sound clarity.

Are RTM tapes compatible with my reel-to-reel machine?

Yes! RTM tapes are designed to be compatible with most vintage and modern reel-to-reel recorders, including Studer, Otari, Revox, TEAC, Tascam, Nagra, and Sony.

Which reel size & type do I need to start recording ?

The appropriate reel diameter depends on your machine. The most common reels are 10.5’’ (26.5cm) diameter (for example: All Studers , Revox B77, Revox A77, etc) ; for smaller machines (for example: Nagra III, Akai 4000DS, TEAC A2340SX, Pioneer RT707…) we can also provide 7’’ (18cm) & 5’’ (13cm) tapes. 12’’ (30cm) reels can only fit specific professional machines. 

5’’ & 7’’ are only supplied in plastic reels (Trident hub); whereas 10.5’’ reels come in plastic reels (trident reel pattern), metal reels (NAB hub) or in the pancake version (no reel, NAB hub).

Why are  there different speed settings on my machine ?

Common recording speeds are 3.75, 7.5, 15 and 30 inches per second (ips). 30ips are only used on certain professional machines.

The higher the speed, the better the stability of high frequencies and sound quality ; however recording time will be reduced. For home use, the best compromise (speed/quality) would be 7.5ips.

How to calibrate my machine ?

Tape recorder calibration is a key process to make sure your machine is set to the tape formula (SM900, SM911, LPR90, LPR35) you choose. Please have a look at our dedicated section: “How to calibrate my machine”

Which bias is recommended for my tape ?

In every technical datasheet (https://www.recordingthemasters.com/audiotapes) , you can find the recommended bias setting according to the tape formula you chose. Please check Section 2. Measurement conditions : ΔS10 sensitivity drop recommended bias setting. 

The recommended bias is set while recording an input signal of 10kHz at–20dB. Based on the peak of the sensitivity curve S10, the bias should be increased until the playback level is reduced by the given value ΔS10.

Which RTM tape formula is equivalent to the traditional brands as RMGI, BASF, EMTEC, AMPEX, QUANTEGY, etc ?

RTM owns the original formulas created by AGFA & BASF which have proved their high quality in the audio professional recording field for several decades. Product range has changed along years but the premium magnetic formulas have remained and are still manufactured : SM900 ; SM911 ; LPR35 ; LPR90.

Our tapes are compatible with all machines and provide equivalent operating levels to traditional brands as BASF, EMTEC, RMGI, AMPEX, QUANTEGY and more to fit every usage and sound taste.

Here is a non-exhaustive operating level compatibility chart

Where to get calibration/test tapes ?

Calibration tapes are key to monitor your recorder and adapt its settings to the tape formula you choose. 

Here is a list of the calibration tapes producers we know :

Magnetic Reference Laboratory (USA): https://www.mrltapes.com/

Nagravox (Australia): https://nagravox.com/

Test Tape (Europe): https://www.test-tape.com/

Please refer then to our dedicated section (“How to calibrate my machine”), making sure you follow the manufacturer’s calibration tapes instructions.

Where can I buy a tape recorder ? or repair one ?

Thanks to our partners, we’ve built an area on our website dedicated to tape recorder repairers & manufacturers. This list is organized per country, please have a look at it and feel free to contact them: https://www.recordingthemasters.com/reel-to-reel-machine-refurbishers-manufacturers

What makes RTM tapes different from other brands?

  • Superior analog sound quality with warm tones and rich depth.
  • High durability for long-term playback and storage.
  • Manufactured with premium materials for consistent performance.

Ordering + Shipping

Where can I buy RTM tapes?

You can purchase RTM tapes from our official online store and authorized retailers worldwide.

Here is the list of dealers, ordered by country.

Do you ship internationally?

Yes! We offer worldwide shipping to ensure RTM tapes are available to customers around the globe.

How can I track my order?

Once your order is shipped, you'll receive a tracking number via email to monitor your delivery status.

Technical Support

How should I store my analog tapes for longevity?

To ensure the longest life for your tapes:

  • Store in a cool, dry place away from direct sunlight.
  • Keep tapes in their original boxes to prevent dust and moisture damage.
  • Avoid strong magnetic fields that could erase or degrade recordings.

What is the shelf life of RTM tapes?

RTM tapes are designed for long-term durability, with proper storage ensuring decades of high-quality playback.

How can I optimize my reel-to-reel setup for the best recording quality?

  • Use RTM tapes recommended for your specific recording application.
  • Regularly clean your tape heads and capstans.
  • Ensure your machine is properly calibrated for optimal performance.

Contact + Support

How can I contact RTM for support?

For any inquiries, reach out to our customer service team on this email address sales@recordingthemasters.com.

Do you offer bulk orders for studios and professionals?

Yes! We provide special pricing and wholesale options for professional studios, archivists, and retailers. Contact us for more details.