Grundig como chassis12 - UK Vintage Radio Repair and Restoration Discussion Forum

vinrads · 1st Jul 2022, 5:24 pm

I have a Grundig como on the bench ,problem when playing records mono is low switch to stereo it is louder but it is as if the common earth on the speakers is disconnected ,I have connected the speakers directly to the tx 's the cartridge seems to be ok ,the chassis is the one using ELL80 output , a schematic would be a help . Mick.

frsimen · 1st Jul 2022, 7:43 pm

The NVHR website has the circuit diagrams for a few Grundig Como variants with ELL80 output valves, one of them may match the Chassis12.

https://www.nvhr.nl/gfgf/schema.asp?...ssubmitted=yes

Paula

vinrads · 1st Jul 2022, 10:21 pm

Thanks for the info Paula ,after much searching it looks like a CS200 chassis , Mick.

vinrads · 2nd Jul 2022, 3:24 pm

An update on the chassis ,the audio fault was due to a 47uf capacitor in the balance control cct o/c also no VHF was due to a 15 k ohm resistor oc in the tuner ,a feed through capacitor had broken causing int low gain fitted a 4.7nf cap after the picture was taken ,all is well now . Mick.

1st Jul 2022, 5:24 pm	#1
vinrads Dekatron Join Date: Feb 2009 Location: Chesterfield, Derbyshire, UK. Posts: 3,767	Grundig como chassis12 I have a Grundig como on the bench ,problem when playing records mono is low switch to stereo it is louder but it is as if the common earth on the speakers is disconnected ,I have connected the speakers directly to the tx 's the cartridge seems to be ok ,the chassis is the one using ELL80 output , a schematic would be a help . Mick. Last edited by vinrads; 1st Jul 2022 at 5:36 pm.

1st Jul 2022, 7:43 pm	#2
frsimen Heptode Join Date: Jan 2011 Location: Croydon, London, UK. Posts: 773	Re: Grundig como chassis12 The NVHR website has the circuit diagrams for a few Grundig Como variants with ELL80 output valves, one of them may match the Chassis12. https://www.nvhr.nl/gfgf/schema.asp?...ssubmitted=yes Paula

1st Jul 2022, 10:21 pm	#3
vinrads Dekatron Join Date: Feb 2009 Location: Chesterfield, Derbyshire, UK. Posts: 3,767	Re: Grundig como chassis12 Thanks for the info Paula ,after much searching it looks like a CS200 chassis , Mick.

2nd Jul 2022, 3:24 pm	#4
vinrads Dekatron Join Date: Feb 2009 Location: Chesterfield, Derbyshire, UK. Posts: 3,767	Re: Grundig como chassis12 An update on the chassis ,the audio fault was due to a 47uf capacitor in the balance control cct o/c also no VHF was due to a 15 k ohm resistor oc in the tuner ,a feed through capacitor had broken causing int low gain fitted a 4.7nf cap after the picture was taken ,all is well now . Mick. Attached Thumbnails Last edited by vinrads; 2nd Jul 2022 at 3:36 pm.