Bush DAC 90A resistor values? - UK Vintage Radio Repair and Restoration Discussion Forum

Pyeeye1749# · 28th Jul 2025, 5:05 pm

Hi just a quick question, this is my first post, i have a copy of the trader sheet 1161 and the bush service sheet.
r6 on trader sheet is 330ohms but the bush service sheet it calls for 2.2 meg.

r8 on bush service sheet calls for 330 ohms and on trader sheet its2.2 meg.
which is telling the truth ?

Many thanks.

Station X · 28th Jul 2025, 5:33 pm

Actually this isn't your first post, you started this thread, but never acknowledged the replies:-

https://www.vintage-radio.net/forum/showthread.php?t=215079

As far as the resistor values go both service sheets are correct. The resistor designations in a radio are arbitrary. You'll find that the resistors you mention are shown in different positions in the circuit diagrams which form part of the service sheet. Apart from that the resistors' colour codes will show their value.

Sideband · 28th Jul 2025, 6:31 pm

You should be able to tell from the circuits that the resistor designated R6 on the Trader sheet is different from the resistor designated as R6 in the Bush service sheet. Don't compare the two circuits. Trader sheets usually number their components differently from the Manufacturer sheets. Work from one circuit only to avoid confusion. As stated above you should be able to tell the value of the resistor from the colour code.

28th Jul 2025, 5:05 pm	#1
Pyeeye1749# Diode Join Date: Jul 2022 Location: Huntley, Gloucester, UK. Posts: 2	Bush DAC 90A resistor values? Hi just a quick question, this is my first post, i have a copy of the trader sheet 1161 and the bush service sheet. r6 on trader sheet is 330ohms but the bush service sheet it calls for 2.2 meg. r8 on bush service sheet calls for 330 ohms and on trader sheet its2.2 meg. which is telling the truth ? Many thanks.

28th Jul 2025, 5:33 pm	#2
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 22,800	Re: Bush DAC 90A resistor values? Actually this isn't your first post, you started this thread, but never acknowledged the replies:- https://www.vintage-radio.net/forum/showthread.php?t=215079 As far as the resistor values go both service sheets are correct. The resistor designations in a radio are arbitrary. You'll find that the resistors you mention are shown in different positions in the circuit diagrams which form part of the service sheet. Apart from that the resistors' colour codes will show their value. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

28th Jul 2025, 6:31 pm	#3
Sideband Dekatron Join Date: Oct 2003 Location: Croydon, Surrey, UK. Posts: 8,314	Re: Bush DAC 90A resistor values? You should be able to tell from the circuits that the resistor designated R6 on the Trader sheet is different from the resistor designated as R6 in the Bush service sheet. Don't compare the two circuits. Trader sheets usually number their components differently from the Manufacturer sheets. Work from one circuit only to avoid confusion. As stated above you should be able to tell the value of the resistor from the colour code. __________________ There are lots of brilliant keyboard players and then there is Rick Wakeman.....