A condensed quick-reference page for dating a Fender tube amp when you don’t have time for the full guide. Print this, screenshot it, or bookmark it — and use the pillar for the complete methodology when something doesn’t match.
Step 1 — Which era is your amp?
| Era | Years | Cosmetic signature |
|---|---|---|
| Tweed | 1946–1960 | Yellow lacquered fabric covering, leather handle, woven grille |
| Brown / Blonde | 1960–1963 | Brown or off-white Tolex, oxblood or wheat grille |
| Blackface | 1963–1968 | Black Tolex, black control panel with white script, silver-and-black grille |
| Silverface | 1968–1981 | Black Tolex, silver-and-blue control panel, silver grille (often with blue line) |
| Modern | 1981–present | Black Tolex, black control panel, QA sticker with letter-prefix serial |
Step 2 — Modern amp letter prefix decoder (1990+)
| Prefix | Year | Prefix | Year |
|---|---|---|---|
| A | 1990 | G | 1996 |
| B | 1991 | H | 1997 |
| C | 1992 | I | 1998 |
| D | 1993 | J | 1999 |
| E | 1994 | K | 2000 (transitional) |
| F | 1995 | 2-letter prefixes | 2001+ |
For two-letter prefixes (CR, LO, AB, AC, AD…) cross-reference with Fender’s official lookup tool.
Step 3 — Pre-1990 quick checks
Look for these markings (in order of reliability):
- Tube chart sticker inside cabinet: shows model code (e.g., “AB763 Deluxe Reverb”) and two-letter date stamp. Year letter rolls forward through the alphabet starting roughly 1953; month letter A–L for Jan–Dec.
- Transformer codes on bell ends: format 606-YWW (Schumacher year+week). Cross-reference both power and output transformer dates.
- Speaker date codes on speaker frames: format 220-YWW (Jensen), 465-YWW (Oxford), 137-YWW (CTS).
- Control panel script: pre-CBS reads “Fender Electric Instrument Co.”; post-CBS (after January 1965) reads “Fender Musical Instruments.”
Speaker manufacturer codes
| Code | Manufacturer |
|---|---|
| 220 | Jensen |
| 465 | Oxford |
| 137 | CTS |
| 328 | Utah |
| 67 | Eminence |
| 285 | Rola |
| 391 | Magnavox |
Common circuit designations
| Era | Typical circuit prefixes |
|---|---|
| Tweed | 5C, 5D, 5E, 5F, 5G (e.g., 5E3 Deluxe, 5F1 Champ, 5F6-A Bassman) |
| Brown / Blonde | 6G (e.g., 6G3 Deluxe, 6G16 Vibroverb) |
| Blackface | AB763 (classic blackface), AA763, AA864, AA1164 |
| Early Silverface | Often retained AB763 under silver panel |
| Late Silverface | AC568 and related CBS-era modifications |
An “AB763” silverface (1968–early 1970s) is sonically a blackface amp under different cosmetics, often available at a significant discount. Worth knowing if you’re shopping.
If something doesn’t match
Mismatches between tube chart, transformer, and speaker dates usually mean one of three things: (1) a replacement part somewhere on the amp, (2) a wider-than-typical assembly window where Fender used old-stock inventory, or (3) you’re misreading one of the codes. Cross-check, and when in doubt, read the full guide or post clear photographs to a vintage amp community for crowd verification.