PYE CTM.17/S Chassis Removal - UK Vintage Radio Repair and Restoration Discussion Forum

Vakito227 · 23rd Jun 2018, 3:37 pm

Hi all, I've recently acquired a Pye CTM.17/S printed circuit board television from the late 50s, it's been stored in a cellar since the late 70s and a lot of the screws were either rusty or seized which doesn't fill me with much confidence about the circuit but oh well.

However before I start worrying about all that I need to get the chassis out. I've removed the 2 screws at the back of the chassis along with the inner knobs at the front of the set but I am stuck on how to remove the outer knobs, I can't seem to find a way to remove them without breaking them. Has anyone worked on one of these sets before and knows how to do it?

Thanks Peter

HamishBoxer · 23rd Jun 2018, 3:57 pm

I am guessing that is Not a circlip on the picture?If not then thread or thin insulated wire behind the knobs and a gentle pull ,may work.

Vakito227 · 23rd Jun 2018, 4:17 pm

Hi, yep they were just a push on fit that has seized to the shaft over the years, took quite a bit of force to loosen them actually. Nice one

FERNSEH · 23rd Jun 2018, 8:19 pm

A hand wired version of the CTM17S was also made, that's the Pye Continental I have in the shop. Nice simple circuit, direct line sync, mean level vision AGC, all very straight forward in terms of design. A lot easier to fix than the Ekco TCG318 is.
Four versions of the 17/21S chassis. Hand wired, one with two PCB boards and the later single PCB chassis. Some sets do have flywheel line sync.
A good idea to pass a small DC current through the line transformer windings to drive out any moisture.
MW43-69 CRT.
If your set is the twin PCB version I have a spare RV16 service manual. Date May 1957.

DFWB.

23rd Jun 2018, 3:37 pm	#1
Vakito227 Hexode Join Date: Apr 2016 Location: Yeadon, West Yorkshire, UK. Posts: 251	PYE CTM.17/S Chassis Removal Hi all, I've recently acquired a Pye CTM.17/S printed circuit board television from the late 50s, it's been stored in a cellar since the late 70s and a lot of the screws were either rusty or seized which doesn't fill me with much confidence about the circuit but oh well. However before I start worrying about all that I need to get the chassis out. I've removed the 2 screws at the back of the chassis along with the inner knobs at the front of the set but I am stuck on how to remove the outer knobs, I can't seem to find a way to remove them without breaking them. Has anyone worked on one of these sets before and knows how to do it? Thanks Peter Attached Thumbnails

23rd Jun 2018, 3:57 pm	#2
HamishBoxer Dekatron Join Date: Aug 2007 Location: W.Butterwick, near Doncaster UK. Posts: 8,932	Re: PYE CTM.17/S Chassis Removal I am guessing that is Not a circlip on the picture?If not then thread or thin insulated wire behind the knobs and a gentle pull ,may work. __________________ G8JET BVWS Archivist and Member V.M.A.R.S

23rd Jun 2018, 4:17 pm	#3
Vakito227 Hexode Join Date: Apr 2016 Location: Yeadon, West Yorkshire, UK. Posts: 251	Re: PYE CTM.17/S Chassis Removal Hi, yep they were just a push on fit that has seized to the shaft over the years, took quite a bit of force to loosen them actually. Nice one Attached Thumbnails

23rd Jun 2018, 8:19 pm	#4
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: PYE CTM.17/S Chassis Removal A hand wired version of the CTM17S was also made, that's the Pye Continental I have in the shop. Nice simple circuit, direct line sync, mean level vision AGC, all very straight forward in terms of design. A lot easier to fix than the Ekco TCG318 is. Four versions of the 17/21S chassis. Hand wired, one with two PCB boards and the later single PCB chassis. Some sets do have flywheel line sync. A good idea to pass a small DC current through the line transformer windings to drive out any moisture. MW43-69 CRT. If your set is the twin PCB version I have a spare RV16 service manual. Date May 1957. DFWB.