G.U.S 200 Radio Gram - UK Vintage Radio Repair and Restoration Discussion Forum

lovetone · 11th Aug 2022, 4:55 pm

I have in for repair a GUS 200 Radio Gram just wondering if anyone might know which Alba radio it might be similar to as I'm trying to find a schematic.

Simple fault really, just has a bad hum / buzz mainly on the Gram

I have been told that these where made for a catalogue company in the 50's but that's all I know.

Station X · 11th Aug 2022, 5:01 pm

GUS. Great Universal Stores.

paulsherwin · 11th Aug 2022, 5:37 pm

https://en.wikipedia.org/wiki/GUS_(retailer)

Nuvistor · 11th Aug 2022, 9:06 pm

Photos of the chassis and valve line up may help.

lovetone · 19th Aug 2022, 10:50 am

Thanks I did know about the live chassis, I have been running it through an isolation transformer.

I have added a few photos of the chassis the valves are listed below

UY85, UCL82, UBF89, UCH81

The hum is only really associated with the Gram setting, the radio otherwise is not to bad.

It would be useful to have a schematic to go through the complete unit.

Nuvistor · 19th Aug 2022, 11:13 am

If you can’t find the exact circuit, have a look at other sets with the same valve line up. It’s a very standard line up and circuits will not be very different.

Hartley118 · 19th Aug 2022, 3:20 pm

The sight of those several lengths of shielded cable suggests that someone before you also experienced a hum problem. Maybe it was the original manufacturer.

Martin

Edward Huggins · 19th Aug 2022, 5:58 pm

Treat it like you would a UCL82/UY85 basic record player and trace the circuit and AF signal grounding from the cartridge to the speaker.

11th Aug 2022, 4:55 pm	#1
lovetone Banned Join Date: Apr 2011 Location: UK Posts: 20	G.U.S 200 Radio Gram I have in for repair a GUS 200 Radio Gram just wondering if anyone might know which Alba radio it might be similar to as I'm trying to find a schematic. Simple fault really, just has a bad hum / buzz mainly on the Gram I have been told that these where made for a catalogue company in the 50's but that's all I know.

11th Aug 2022, 5:01 pm	#2
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,288	Re: G.U.S 200 Radio Gram GUS. Great Universal Stores. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

11th Aug 2022, 5:37 pm	#3
paulsherwin Moderator Join Date: Jun 2003 Location: Oxford, UK Posts: 27,943	Re: G.U.S 200 Radio Gram https://en.wikipedia.org/wiki/GUS_(retailer)

11th Aug 2022, 9:06 pm	#4
Nuvistor Dekatron Join Date: Aug 2013 Location: Wigan, Greater Manchester, UK. Posts: 9,433	Re: G.U.S 200 Radio Gram Photos of the chassis and valve line up may help. __________________ Frank

19th Aug 2022, 10:50 am	#5
lovetone Banned Join Date: Apr 2011 Location: UK Posts: 20	Re: G.U.S 200 Radio Gram Thanks I did know about the live chassis, I have been running it through an isolation transformer. I have added a few photos of the chassis the valves are listed below UY85, UCL82, UBF89, UCH81 The hum is only really associated with the Gram setting, the radio otherwise is not to bad. It would be useful to have a schematic to go through the complete unit. Attached Thumbnails Last edited by lovetone; 19th Aug 2022 at 11:18 am.

19th Aug 2022, 11:13 am	#6
Nuvistor Dekatron Join Date: Aug 2013 Location: Wigan, Greater Manchester, UK. Posts: 9,433	Re: G.U.S 200 Radio Gram If you can’t find the exact circuit, have a look at other sets with the same valve line up. It’s a very standard line up and circuits will not be very different. __________________ Frank

19th Aug 2022, 3:20 pm	#7
Hartley118 Nonode Join Date: Aug 2015 Location: Cambridge, Cambs. UK. Posts: 2,198	Re: G.U.S 200 Radio Gram The sight of those several lengths of shielded cable suggests that someone before you also experienced a hum problem. Maybe it was the original manufacturer. Martin __________________ BVWS Member

19th Aug 2022, 5:58 pm	#8
Edward Huggins Dekatron Join Date: Sep 2015 Location: Southwold, Suffolk, UK. Posts: 8,327	Re: G.U.S 200 Radio Gram Treat it like you would a UCL82/UY85 basic record player and trace the circuit and AF signal grounding from the cartridge to the speaker. __________________ Edward.