Quick Answer
Classic Braun Series 7 and Pulsonic shavers in the 70S/70B model groups use the classic cassette path. The newer Series 7 Flex models listed below use the 73S path. The words “Series 7” alone do not identify the right replacement: match the model number or the code on the old cassette before you buy.
Once you have identified the cassette family, start with the Braun Series 7 Replacement Head product page and choose the matching Series 7 option.
Last updated: July 29, 2026 | Author: William | Estimated reading time: 6 minutes
Find the Model Number and Old Cassette Code First
Look for the full shaver model on the handle, its rating label, the original manual, or a previous order. Then check the old cassette for a visible marking such as 70S, 70B, or 73S. The old cassette code is the best like-for-like starting point.
If the old cassette and the model number point to different families, do not choose based on appearance or on the Series 7 name. Recheck the complete model reference before ordering.
Braun Series 7 70S Classic Compatibility
The following classic Braun Series 7 and Pulsonic model groups use the 70S/70B cassette path:
| Classic model group | Listed models |
|---|---|
| 790cc / 795cc | 790cc, 790cc-3, 790cc-4, 790cc-5, 790cc-7, 795cc-3 |
| 760cc | 760cc, 760cc-3, 760cc-4, 760cc-5, 760cc-6, 760cc-7 |
| 750cc | 750cc, 750cc-3, 750cc-4, 750cc-5, 750cc-6, 750cc-7 |
| 720 / 720s | 720, 720s-3, 720s-4, 720s-5, 720s-6, 720s-7 |
| 730 / 735 | 730, 730s-3, 730s-4, 735s-3, 735cc-4 |
| 78xx | 7898cc, 7899cc, 7865cc, 7850cc, 7840s |
| Pulsonic | 9565, 9566, 9581, 9585, 9591, 9781, 9782, 9785, 9791, 9795 |
For these classic models, choose the 70S/70B-style option that matches the code on the cassette you are replacing. Do not treat 70S and 70B as a reason to ignore the current part marking, finish, or exact product listing.
Braun 73S / Next-Generation Flex Compatibility
The following newer Series 7 models use the 73S path:
| Newer Series 7 model group | Listed models |
|---|---|
| 71xx Flex models | 7120s, 7125s, 7127cs, 7171cc, 7175cc, 7185cc, 7189cc |
| 70xx Flex models | 7020s, 7025s, 7027cs, 7071cc, 7075cc, 7085cc, 7089cc |
| Additional 70xx references | 7020, 7027, 7071, 7075 |
These are not the same fit path as the classic models above. Do not order a 70S/70B-style cassette for a listed 73S model, and do not order a 73S cassette for a classic 790cc-, 760cc-, 750cc-, 720-, 730-, or listed 78xx-series shaver.
For the direct side-by-side question, use the Braun 70S vs 73S comparison before selecting a replacement.
Choose the Right Series 7 Cassette
| What you can verify | Correct next step | Avoid |
|---|---|---|
| Old cassette says 70S or 70B | Use the classic 70S/70B path and match the code and listing details. | Replacing it with a 73S because it is also described as Series 7. |
| Model appears in the classic table | Use the 70S/70B path, then compare the old cassette marking. | Choosing by shaver color or a partial model number. |
| Old cassette says 73S | Use the 73S path. | Treating it as interchangeable with 70S or 70B. |
| Model appears in the newer Flex table | Use the 73S path. | Ordering a classic 70S/70B cassette. |
| Model or cassette code is missing | Pause and identify the full model or old part number first. | Buying a head simply because the handle says Series 7. |
Why Series 5 and Series 6 Should Not Drive a Series 7 Choice
The 73S family also appears in some newer Braun Series 5 and Series 6 shavers. That does not make every 73S-related listing a Series 7 replacement, and it does not make a Series 5 or Series 6 model a substitute for a Series 7 fit check. Choose by the shaver’s own series, exact model, and existing cassette code.
If Your Model Is Not Listed
An unlisted model is not automatically compatible with either family. Check these sources in order:
- The code printed on the old cassette.
- The full model reference on the shaver or manual.
- A verified parts listing or Braun support record for that exact model.
Do not force a replacement head that sits high, does not align, or will not click into place. A head that does not seat properly may belong to the wrong cassette family. For installation checks after you have confirmed the correct family, see how to replace a Braun Series 7 shaver head.
Compatible Replacement Heads and Genuine Braun Parts
A compatible replacement head is made to fit the listed shaver family; it is not automatically a genuine Braun part. Check the product page description before ordering if genuine-brand status matters to you. Braun is a trademark of its respective owner and is used here only to identify shaver compatibility.
FAQ
Is “Braun Series 7” enough to identify the right cassette?
No. The Series 7 name covers classic 70S/70B-path shavers and newer 73S-path models. Use the full model number or the marking on the old cassette.
Are 70S, 70B, and 73S interchangeable?
Treat the classic 70S/70B path and the newer 73S path as separate replacement families. Match the old cassette code and the exact model instead of substituting between the two paths.
What if my old cassette is missing its code?
Use the complete model reference first. If the model is not in either table or the evidence conflicts, confirm it through a verified parts source before ordering.
Why will a replacement cassette not click into my shaver?
Do not force it. A mismatch between the classic 70S/70B and newer 73S families can prevent correct seating. Recheck the model number, old cassette code, and cassette orientation before trying again.
