Leak Delta 70 (Early 1970s)
The Leak Delta 70 turns up on period equipment lists and in vintage dealer inventories, but almost nothing solid has survived about it in the usual reference sources. It belongs to Leak's Delta series from the early 1970s - the transistor-era lineup that followed the company's valve amplifiers - and it sat alongside the Delta 30 and Delta 75 in the range. Past that, the paper trail gets thin fast.
Here is what is reasonably well established. The Delta 70 is a solid-state stereo amplifier, part of Leak's move into transistor designs after decades of building some of Britain's most respected valve electronics. Audio-Collection (1972, p.182) pictured it in a roundup of stereo amplifiers of the period, alongside the better-known British and Japanese contenders of the day. The same publication's coverage of the 1970 International Audio Festival and Fair noted that the entire Delta range was new that season, with regular demonstrations on the Leak stand. So the Delta 70 was being sold as a current model, not a holdover.
On paper, hifi-wiki.com rates the Delta 70 at 40W per channel, though at least one source claims 60W into 8Ω. That conflict is unresolved, and without an original manual or service sheet there is no way to settle it. Line inputs and speaker outputs are documented. The specific input count, frequency response, distortion figures, dimensions, and weight have not surfaced in any source. The original price is likewise unrecorded.
Known specs, such as they are:
- Stereo amplifier, solid-state (Delta series)
- Rated power: 40W per channel (one source; another claims 60W into 8Ω — unresolved)
- Inputs: line-level (specific count not documented)
- Outputs: speaker (connection specifics not documented)
- Period: early 1970s; exact production years unclear
Anyone with a Delta 70 manual, a service sheet, or even the serial number plate details can send them to the archive. Every confirmed fact helps here.
eBay Listings
As an eBay Partner, we earn from qualifying purchases. This helps support our independent vintage technology research.
Related Models
- Leak Delta 30
- Leak Stereo 230
- Leak STEREO-30 (1963)
- Leak STEREO-60 (1959)
- Leak STEREO-70 (1957)
- Eico 3150 (1967)
- Fisher CUSTOM-ELECTRA-I (K-14/K-15) (1957)
- Fisher CUSTOM-ELECTRA IV (E33/E44) (1960)
- Akai AM-2400 (1978)
- Akai AM-2600 (1977)