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Old 27th Mar 2021, 5:42 pm   #21
The teleman
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Default Re: Telpro C561

This is the new loptx fitted
And to show the old loptx with a hole in the overwind
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Old 28th Mar 2021, 8:44 am   #22
Tazman1966
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Default Re: Telpro C561

I can just imagine the old one sizzling! Hope it's successful Chris.
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Old 29th Mar 2021, 10:00 am   #23
Welsh Anorak
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Default Re: Telpro C561

I wouldn't connect the tripler just yet. It looks like the LOPT failed for its own reasons, but you never know! It's nice to find a reason the set was retired as then most other panels (except the msiing one, of course!) will probably be OK.
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Old 29th Mar 2021, 9:32 pm   #24
Chris55000
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Default Re: Telpro C561

Hi!

Update on the replacement PSU board for the OP Chris Field – my design is now virtually all complete apart from the two +25V and the –35V smoothing caps – I've only to measure the original caps, make the PCB footprints and drop them in!

Final job is to email the OP a paper template to measure up against his chassis and then once confirmed the size is correct it can go for manufacturing!

Chris Williams
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Old 10th Apr 2021, 9:19 pm   #25
Chris55000
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Default Re: Telpro C561

Hi!

Replacement PSU and AF Panel design for the OP Chris Field's Telpro C561 now complete and ready to send for manufacturing!

I'll post the Gerber files once I've had confirmation from the OP that it's the correct size!

I've laid it out using original Bradford components, so hopefully everything will fit OK!

Chris Williams

PS!

I made provision on this board for both revisions of the PCL82 Audio Circuit that Decca used in their Bradford chassis, as I am of the opinion that running the pentode anode of the PCL82 direct from the main 300 V h.t. line is far too much for this valve, so included provision for both the main h.t. feed resistor R82 (1k8 9W fusible), the main decoupler C84 (33uF 400V), and the additional screen-grid/triode anode decoupling components R83 (4k7, 1W) and C83 (4uF 400V).
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Old 18th Apr 2021, 9:09 pm   #26
Chris55000
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Default Re: Telpro C561

Hi!

Circuit diagram to which the PCB has been designed now attached!

Chris Williams
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File Type: pdf Telpro C561 Audio and PSU Panel - PCB Circuit Diagram.pdf (458.5 KB, 39 views)
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Old 25th Apr 2021, 7:51 pm   #27
Chris55000
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Default Re: Telpro C561

Hi!

Panel manufacture now complete and on it's way to me!

Chris Williams
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Old 27th Apr 2021, 4:32 pm   #28
Tazman1966
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Default Re: Telpro C561

Keep keeping us updated Chris! Plenty of Deccas about but next to no Telpros.
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Old 7th May 2021, 5:09 am   #29
Chris55000
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Default Re: Telpro C561

Hi!

New PCB now arrived and ready for assembly, which I'll get started on this weekend!

My grateful thanks to Member "Davidh1041" who furnished me with a spare Decca Bradford PSU for the transformer, etc!

The PCB was designed and laid out using "Easy PC", but it should be possible to replicate this type of panel using the free "Design Spark" software as it is not necessary to use an "autorouter" – the AR in D.S. is absolute rubbish!

I have already provided the TTFs for the "Radio Constructor" style lettering used on the silkscreen printing elsewhere on this forum, by the way!

Once assembly is complete I'll test it and get it posted to the OP later next week!

Chris Williams

PS!

Gerber Files and a ready–made PCB available from me on application via PM!
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