UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Decca Bradford Preset Brightness Modification?

Hybrid tellies · 19th Apr 2021, 10:22 am

The Decca Bradford which was in production from 1971 to 1977 did undergo quite a few changes over this period.

The original was know as the Decca Bradford 10 which used a a fully discreet decoder/RGB output board and was a 25Kv chassis driving 19" 22" and 26" CRT's. This was followed by the Bradford 30 chassis which used a MC1327 Matrix and driver chip on the decoder and RGB board. There was two versions of the 30 chassis the 25Kv version for 20", 22" and 26" CRT's and a 20Kv version for the smaller 17" and 18" models.
The 30 chassis had a few tweaks made to it over its production run from 1972 to 1977.

At a guess the circuit diagram you have shown is an early version Decca 10 chassis.

19th Apr 2021, 10:22 am	#2
Hybrid tellies Nonode Join Date: Jan 2004 Location: 1966-1976 Coverack in Cornwall and Helston Cornwall. 1976-present Bristol/Bath area. Posts: 2,967	Re: Decca Bradford Preset Brightness Modification? The Decca Bradford which was in production from 1971 to 1977 did undergo quite a few changes over this period. The original was know as the Decca Bradford 10 which used a a fully discreet decoder/RGB output board and was a 25Kv chassis driving 19" 22" and 26" CRT's. This was followed by the Bradford 30 chassis which used a MC1327 Matrix and driver chip on the decoder and RGB board. There was two versions of the 30 chassis the 25Kv version for 20", 22" and 26" CRT's and a 20Kv version for the smaller 17" and 18" models. The 30 chassis had a few tweaks made to it over its production run from 1972 to 1977. At a guess the circuit diagram you have shown is an early version Decca 10 chassis. __________________ Simon BVWS member