Dynatron CTV16 - UK Vintage Radio Repair and Restoration Discussion Forum

mark clinton · 20th Apr 2014, 3:43 pm

Having just picked up in Birmingham last week, iI just got to plug it in and connected the aerial to what must be the last broadcasts of anologue signals. There are 3 UHF channels still available on the UPC system in Dublin, the channels are E4, Channel4 and Discovery. iI was delighted to see the old set come up with a fairly sharp picture and good sound. The only main problem is there is no control to the brightness and it seems to be flat out full with no change with the slider control or the wheel control on the wired remote. iI bypassed the remote incase it was causing the problem, but no change.

Any suggestions please?

MALC SCOTT · 21st Apr 2014, 12:07 am

Hi, is this the hybrid chassis or the solid state one? Can you post a couple of pics?, Malc.

Tazman1966 · 21st Apr 2014, 11:02 am

It's the hybrid 697 chassis Malc. I used to have one.

FERNSEH · 21st Apr 2014, 4:38 pm

The brightness control works by varying the bias on the PL802 luminance output valve. Effectively changing the voltage at the cathodes of the CRT.

DFWB.

20th Apr 2014, 3:43 pm	#1
mark clinton Retired Dormant Member Join Date: Nov 2010 Location: Dublin, Ireland. Posts: 2	Dynatron CTV16 Having just picked up in Birmingham last week, iI just got to plug it in and connected the aerial to what must be the last broadcasts of anologue signals. There are 3 UHF channels still available on the UPC system in Dublin, the channels are E4, Channel4 and Discovery. iI was delighted to see the old set come up with a fairly sharp picture and good sound. The only main problem is there is no control to the brightness and it seems to be flat out full with no change with the slider control or the wheel control on the wired remote. iI bypassed the remote incase it was causing the problem, but no change. Any suggestions please?

21st Apr 2014, 12:07 am	#2
MALC SCOTT Octode Join Date: Aug 2006 Location: Willington, County Durham, UK. Posts: 1,499	Re: Dynatron CTV16 Hi, is this the hybrid chassis or the solid state one? Can you post a couple of pics?, Malc. __________________ Malc Scott

21st Apr 2014, 11:02 am	#3
Tazman1966 Nonode Join Date: May 2006 Location: St Albans, Herts, UK. Posts: 2,193	Re: Dynatron CTV16 It's the hybrid 697 chassis Malc. I used to have one. __________________ All the very best, Tas

21st Apr 2014, 4:38 pm	#4
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: Dynatron CTV16 The brightness control works by varying the bias on the PL802 luminance output valve. Effectively changing the voltage at the cathodes of the CRT. DFWB.