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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc.

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Old 9th Jun 2018, 9:29 pm   #21
FERNSEH
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Default Re: Decca DR101 dual standard TV

Hi John, the B7G plug will be gratefully received.

It's a very easy task to remove the chassis from the cabinet. Disconnect the loudspeaker leads, the five control panel plugs on the left side of the chassis, remove the two 2BA hex head chassis securing screws and withdraw the chassis complete with the CRT.

Only one waxie found in the frame timebase, C96, a 0.2mfd TCC component - and it's leaky. The cathode bias capacitor C97 500mfd is OK but the PCL85 screen grid decoupler C98 might be suspect.
Lots of black tubular Hunts capacitors to check for leaks.
The attachment shows the circuit diagram of the model DR39.

DFWB.
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Old 13th Jun 2018, 3:33 pm   #22
Focus Diode
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Default Re: Decca DR101 dual standard TV

A little work did wonders for the performance of the set. Note how the chassis comes out complete with CRT. Bit hazardous if children were around if serviced in the home I would have thought.

The components are beautifully laid out with each component relatively easy to get to.

Much work still to do. The CRT is as good as new.

Photos taken with David's kind permission..

What a cracking set!

Cheers
Brian
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Old 13th Jun 2018, 7:58 pm   #23
FERNSEH
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Default Re: Decca DR101 dual standard TV

Thanks to Brian for posting up the pictures. Still work to do on this set before it can be signed off. The width control doesn't work, it's likely the coupling capacitor between the line oscillator and the grid of the PL36 has a leak. The Decca has a stabilised line output stage which employs a VDR as the device to rectify the flyback pulse to produce the controlling negative bias for the line output valve.

The picture needs more height, it's likely more capacitors need replacing. The vision AGC isn't working properly and again it'll be those Hunts capacitors.
Switching over to 625 lines is facilitated by selecting the "UHF" position on the VHF tuner, except it doesn't, that's something else to look into.

DFWB.

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Old Today, 7:13 pm   #24
Pieter H
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Default Re: Decca DR101 dual standard TV

Hi David,
that look like Philips tuners in the Decca set.
If so could you make a close-up picture and/or tell what is written on the labels?

Cheers, Pieter
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Old Today, 9:36 pm   #25
FERNSEH
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Default Re: Decca DR101 dual standard TV

Hi Pieter,
The VHF tuner is a Philips AT7639/22. When the control panel is removed we'll find out the type of UHF tuner, it is a Philips, that's for sure.

John HKS has kindly donated a B7G plug to replace the burnt out one.
The set does work well on 625 lines UHF but there is a problem with the standards switch solenoids.

DFWB.
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