Value in this market follows originality and condition before age, and the models that carry a premium are a small set. This page gives the framework the classes are built on, not a price list — no sold-price data was collected for this reference.
| Class | Years | Market data | What drives it |
|---|---|---|---|
| Tweed Fender combos and heads | 1946–1960 | no market data collected yet | Original cabinet and an intact tube chart, matching transformers, condition of the tweed and the speaker make. |
| Brownface and blackface Fender | 1960–1967 | no market data collected yet | Circuit originality, original transformers and drivers, an unmarked faceplate and cabinet, and the model itself. |
| Silverface Fender | 1968–1982 | no market data collected yet | Modified or unmodified circuit, original speakers and transformers, cabinet cosmetics and size. |
| Marshall Plexi and JTM | 1962–1969 | no market data collected yet | Panel, tolex, grille and transformer authenticity — the era most often forged — plus documented provenance. |
| Marshall JCM 800 and 900 | 1981–1992 | no market data collected yet | Model code first, then originality, service history and condition. |
| Vox AC30, JMI era | 1959–1971 | no market data collected yet | Original Woden transformers and Celestion drivers, correct cabinet and cosmetics, and the voicing details of 1963–64. |
| Ampeg SVT, V-series and Portaflex | 1961–1985 | no market data collected yet | Transformer originality, recent professional service and functional condition, since these are working amplifiers rather than shelf pieces. |
| High-gain classics: 5150, Mark series, Hiwatt DR | 1966–2005 | no market data collected yet | Model and revision, service history and condition rather than age; several of these are bought to play. |