# Supro Thunderbolt S6420 — resale value

**Supro Thunderbolt S6420** is worth about **$2,499.99**, based on real closed eBay sales.

## Value

| Condition | Value (USD) |
| --- | --- |
| Used | $2,499.99 |

Values are medians of real closed eBay sales, updated 2026-08-04. They are estimates for reference, not offers or appraisals — condition, completeness and edition move them a lot, so compare against the sold listings before pricing anything.

## Check the market

- [Sold listings on eBay](https://junkpal.ai/api/go?to=https%3A%2F%2Fwww.ebay.com%2Fsch%2Fi.html%3F_nkw%3DSupro%2520Thunderbolt%2520S6420%2520Amp%26LH_Sold%3D1%26LH_Complete%3D1%26mkcid%3D1%26mkrid%3D711-53200-19255-0%26siteid%3D0%26campid%3D5339166094%26toolid%3D10001%26mkevt%3D1%26customid%3Dmd-sold&p=md-sold) — the closed sales these medians are computed from
- [Live listings on eBay](https://junkpal.ai/api/go?to=https%3A%2F%2Fwww.ebay.com%2Fsch%2Fi.html%3F_nkw%3DSupro%2520Thunderbolt%2520S6420%2520Amp%26mkcid%3D1%26mkrid%3D711-53200-19255-0%26siteid%3D0%26campid%3D5339166094%26toolid%3D10001%26mkevt%3D1%26customid%3Dmd-live&p=md-live) — what sellers are asking right now

eBay links are affiliate links: JunkPal may earn a commission at no cost to you.

## Details

| Field | Value |
| --- | --- |
| Brand | Supro |
| Model | Thunderbolt S6420 |
| Year | 1965 |
| Finishes seen | Mint, Blue Rhino |
| Used range | $900 – $2,499.99 |
| Sample size | 2 listings |
| Category | Amps |

## Supro Thunderbolt S6420 resale value

The used Supro Thunderbolt S6420 has a median Reverb asking price of **$2,499.99**, ranging from $900 to $2,499.99 across 2 current listings.

### What drives the price

For a used amp, tube vs solid-state, original speakers/tubes, wattage, and tolex/grille condition move the price most. Vintage and limited runs command a premium; player-grade and modified examples sell for less.

## FAQ

**What is the typical resale value range for the Supro Thunderbolt S6420?**

The current resale range for this 1965 model is between $1,200 and $2,799.99.

**Are there many Supro Thunderbolt S6420 models available?**

Currently, we have a small sample size of 2 listings for this specific model.

**What year was this Supro amp manufactured?**

The Supro Thunderbolt S6420 was manufactured in 1965.

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Full price guide: https://junkpal.ai/products/supro-thunderbolt-s6420-amps-reverb
How these values are computed: https://junkpal.ai/methodology
Cite as: "JunkPal price guide value as of 2026-08-04, based on real sold listings (junkpal.ai)"