Bush TV85 - UK Vintage Radio Repair and Restoration Discussion Forum

Bigmike1958 · 21st Jul 2018, 5:13 pm

Hi, I’ve just seen on a local for sale site a 1959 bush TV model TV85 for sale 20. It has been in a cellar for over 40 yrs, was in house when seller moved in, now moving house need to be rid of. No mains lead, can anyone tell me anything about this model, looks in very good condition. bigmike 1958

Nanozeugma · 21st Jul 2018, 5:53 pm

I think that if you were to read through these pages, it would answer your questions...
https://www.radiocraft.co.uk/502.htm

terrykc · 27th Jul 2018, 7:13 pm

A couple of points about the Bush TV85 (also apply to the TV75 and TV95 series):

The grey Westinghouse selenium rectifier tended to be short lived. In service, we replaced them with an Automat equivalent (dark green) and we never replaced one of those!

You can, of course, replace the rectifier with a suitably rated silicon diode but remember to fit a suitable series resistor to keep the HT voltage to its design figure.

Behind the voltage selector panel are (or were) two green 21Ω WW resistors. (The values might vary by about one ohm or so in different chassis but 21Ω is close enough.) If only one (or neither!) has been replaced, make sure you replace both, as the original Welwyn components were very unreliable. I think they were 4W types and we always replaced them with RS 5W ones, which never failed.

In the link in the previous post there is reference to applying something to the tuner contacts using a metal bladed screwdriver but I wouldn't recommend it as the silver plating is easily damaged.

21st Jul 2018, 5:13 pm	#1
Bigmike1958 Tetrode Join Date: May 2018 Location: Llanelli, West Wales, UK. Posts: 52	Bush TV85 Hi, I’ve just seen on a local for sale site a 1959 bush TV model TV85 for sale 20. It has been in a cellar for over 40 yrs, was in house when seller moved in, now moving house need to be rid of. No mains lead, can anyone tell me anything about this model, looks in very good condition. bigmike 1958

21st Jul 2018, 5:53 pm	#2
Nanozeugma Heptode Join Date: Nov 2017 Location: London, UK. Bury, Lancashire quite regularly :) Posts: 611	Re: Bush TV85 I think that if you were to read through these pages, it would answer your questions... https://www.radiocraft.co.uk/502.htm __________________ Thermionic Emission, warms the cockles of your tubes.

27th Jul 2018, 7:13 pm	#3
terrykc Rest in Peace Join Date: Nov 2010 Location: North Hykeham, Lincolnshire, UK. Posts: 515	Re: Bush TV85 A couple of points about the Bush TV85 (also apply to the TV75 and TV95 series): The grey Westinghouse selenium rectifier tended to be short lived. In service, we replaced them with an Automat equivalent (dark green) and we never replaced one of those! You can, of course, replace the rectifier with a suitably rated silicon diode but remember to fit a suitable series resistor to keep the HT voltage to its design figure. Behind the voltage selector panel are (or were) two green 21Ω WW resistors. (The values might vary by about one ohm or so in different chassis but 21Ω is close enough.) If only one (or neither!) has been replaced, make sure you replace both, as the original Welwyn components were very unreliable. I think they were 4W types and we always replaced them with RS 5W ones, which never failed. In the link in the previous post there is reference to applying something to the tuner contacts using a metal bladed screwdriver but I wouldn't recommend it as the silver plating is easily damaged.