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Old 27th Mar 2021, 6:42 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, 9:44 am   #22
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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, 11:00 am   #23
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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, 10:32 pm   #24
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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, 10:19 pm   #25
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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, 10:09 pm   #26
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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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Old 25th Apr 2021, 8:51 pm   #27
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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, 5:32 pm   #28
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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, 6:09 am   #29
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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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Old 5th Aug 2021, 12:26 pm   #30
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Default Re: Telpro C561

Wow Chris! That PCB looks fantastic. How are you getting along with it?
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Old 5th Aug 2021, 8:54 pm   #31
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Default Re: Telpro C561

Hi Taz , still waiting to hear from Chris about the power supply board ,
Last I heard he was fitting parts that was back in June , I don’t like to ask in case the dreaded COVID has been a problem

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Old 6th Aug 2021, 11:18 am   #32
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Ah, okay. He's probably inundated with all sorts! We'll just have to wait.
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Old 11th Aug 2021, 8:43 pm   #33
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Default Re: Telpro C561

Hi!

Not the dreaded, just a combination of eye–trouble, mislaid bits and a duffy iron!

Update on this with a small confession – I've mislaid some of the small parts, which I'm slowly in the process of finding, (as I've put things away everywhere!) and I'm also having a bit of bother with my soldering iron station, and I'm in the process of waiting for a Black Jack BK2000 one I won last week, hopefully that will get my iron up and running again!

Hopefully more progress soon, sorry for the delay Chris!

Chris Williams

PS!

I'm signed off work due to eye–trouble so I've not got access to the top–notch soldering/desoldering tools at my work's fleapit that would build this really quickly!
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Old 26th Sep 2021, 5:26 pm   #34
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Default Re: Telpro C561

Hi!

PCB now completed and handed to the OP Chris Field @ RetrotechUK this morning – my job is done & I'll hand back to the OP to carry on his tale from here!

Chris Williams

PS!!!!

Now got my Duratool ZD915 new desolder gun and the Black Jack BK2000 soldering station that enabled me to catch up on Chris Field's PCB at long last!
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Old 26th Sep 2021, 10:15 pm   #35
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Default Re: Telpro C561

Hi!

Design update I forgot to mention earlier – when I got the new PCB back from manufacturing I found the only preset potentiometer footprint in my Easy–PC was one of those little tiny "halfpenny size" ones, so I'll modify my PCB to use a standard Piher one – doing that only means turning one resistor round and moving some silkscreen text, and I'll add another 10 mil to the pad hole diameters so the little Erie PCB resistors go in more easily!

Chris Williams
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Old 27th Sep 2021, 10:37 pm   #36
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Default Re: Telpro C561

Update on the Telpro 561
As Chris Williams was designing and making the power supply panel for this set it had been put to one side for a while
On Sunday at the retro tech meeting Chris delivered the remanufactured pcb to me and wow what a fantastic job he has done this it a totally professional job
I would like to take this opportunity to say a massive THANK YOU to Chris for all his time and efforts in re making this power supply .👍

I had the opportunity to fit the pcb today and it worked perfectly, the rest of the set needs attention to make it perfect but the power supply is absolutely spot on .
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Old 28th Sep 2021, 11:30 am   #37
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Default Re: Telpro C561

Not much to do now!
That board is so much better than the original offering and will last far better.
Imagine if this was possible in the Seventies and he re-manufactured Pye CDA panels. Everyone would have beaten a path to his door.
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Old 28th Sep 2021, 11:35 pm   #38
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Default Re: Telpro C561

Hi!

I'm currently two–thirds of the way thro' a BRC2000 h.t. regulator board that's currently proving a bit tricky in places!

Don't all come rushing up at once for Pye Hybrid CDA or 697 vertical PCBs yet please, I'll not be able to keep up. . .!

✏️ ���� ✏️ ���� ✏️ ����

Chris Williams

PS!

PL802 valves still reasonably priced and plentiful. . . .!
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Old 29th Sep 2021, 10:14 am   #39
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Default Re: Telpro C561

I know the one you're doing - it was a little bit awkward!
A Pye vertical PCB would be a challenge....
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Old 30th Sep 2021, 9:15 pm   #40
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Default Re: Telpro C561

Hi!

Not impossible tho' Glyn, as long as I had the remains of an old one to get the dimensions and the edge–connector contacts correctly sized!

I have had a request for a G6 s/s I.F. panel, but I would need to borrow an old one to design the outline correctly and get the spacings of the coil pins!

(I think it's only panels with really awkward shaped internal cutouts may be a problem perhaps!)

Chris Williams

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