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KB cvc2 ctv
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July 19, 2017
10:22 pm
brc_3000
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This interesting set came from a large haul of old tvs recently cleared from a retired tv engineer house. It’s a KB CVC2 hand wired tv. I have not seen one before only heared of them. It’s in reasonable condition and looks very restorable. Crt checks out perfect. Again will get a manual and when time permits update the thread with progress.

Anyone else have one of these ?cvc2-front.jpgImage Enlarger

cvc2-chassis1.jpgImage Enlarger
cvc2-chassis2.jpgImage Enlarger

July 19, 2017
10:31 pm
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Jayceebee
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Oh wow! that is a rare beast indeed. I know fellow member The_Teleman used to own a hand wired CVC, can’t remember if it was a CVC1 or 2 but I’m sure he let us know if he still has it in his collection.

Good luck with it.

John.

July 20, 2017
10:07 am
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Focusdiode
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They had a reputation for being kind to their CRTs. The CVC-1 was the dual standard version.

Rather unique for a model employing colour difference drive the luminance output is transistorised.

Another feature is, should a fault occur in the decoder the panel can be removed for service. The set will continue to work in b&w.

Cheers

 

Brian

July 20, 2017
10:35 am
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Chris
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FocusDiode Said

Another feature is, should a fault occur in the decoder the panel can be removed for service. The set will continue to work in b&w.

I’ve never seen in the flesh, an ITT CVC-1 or CVC-2 therefore have no knowledge or experience of them. Also I’m too lazy to go look them up in R&TS.  So I have a question, everything I’ve read here and elsewhere states they are a fully hand, hard-wired chassis’, no PCB’s. How can it be one can remove the decoder panel? Just curious.

July 20, 2017
10:56 am
brc_3000
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As I remember the brc 3000/3500 also works in black and white with no decoder fitted. We use to rent them out in the early 80s like that to people that wanted black and white only. Not sure why as it would have been cheaper to put in an ex rental bw set but that’s what the boss wanted! 

July 20, 2017
1:28 pm
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ntscuser
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Focusdiode said
The CVC-1 was the dual standard version.

Another significant difference, CVC1 was only ever offered with a 19″ tube with surround mask whereas CVC2 was fitted with the then very-new 22″ push-through tube. There was also a version with tambour door and integral stand but I’ve never even seen a picture of one.

July 20, 2017
6:58 pm
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colourmaster
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Hi 

A rare set the cvc2 , I have a console version with the tambour door and also the model that you have . They were very kind to their tubes , both mind have original mullard green label tubes fitted and have excellent emission. They both however have the same fault at the moment, very weak picture and low gain  I’m not sure if the tuners are faulty or an if fault .

Good luck with yours.

Regards.

Gary.

July 20, 2017
9:04 pm
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Jayceebee
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Goodness me Gary, two CVC2s and a G9. What do you put on your Rhubarb patch, rocking horse manure? 

July 20, 2017
10:24 pm
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PYE625
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Chris said
no PCB’s. How can it be one can remove the decoder panel? Just curious.  

 Looking at the main chassis picture, I thought  the decoder looked like it is mounted on a brown pcb, but seeing the other side in the lower picture, it looks like a hand wired chassis…. duno_gif

I’m curious to know what lurks within the cylinder that the EHT cable emerges from.

Andrew.                                                                                   

                         

July 22, 2017
12:23 am
Hurty
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ITT CVC 2  now that is nice to see after all these years. Missed one on eBay(*inserted) a few months back. Sold a couple ex-rental and looked after a couple of others. They are built just like the V53 mono chassis full hand wired including the decoder. They where very reliable. The only faults I had with them were the LT bridge rectifier, the odd bad ground in the decoder, re-soldering with high wattage iron to cure as the earth tags where part of the chassis and the replacement of the tuner plastic lugs which would eventually crack. Nice to see one again.

Adrian

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July 22, 2017
8:57 am
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Chris
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FocusDiode Said

Another feature is, should a fault occur in the decoder the panel can be removed for service. The set will continue to work in b&w.

Chris said

I’ve never seen in the flesh, an ITT CVC-1 or CVC-2 therefore have no knowledge or experience of them. Also I’m too lazy to go look them up in R&TS.  So I have a question, everything I’ve read here and elsewhere states they are a fully hand, hard-wired chassis’, no PCB’s. How can it be one can remove the decoder panel? Just curious.  

Hurty said
ITT CVC 2  [..] They are built just like the V53 mono chassis full hand wired including the decoder.

 Now its confirmed and as I rightly suspected the decoder is not on a PCB, perhaps someone can now answer my query from a couple of days ago. How is it this set can be run without the decoder, if its hard-wired? Is it a case of just disabling it somehow? I’m intrigued to know how this is achieved.

July 22, 2017
11:54 am
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Chris
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Getting off my lazy butt and reading information from 1970 Radio & Television. 

My Query:
How do you run a CVC-1/CVC-2 in B&W by removing the decoder, if its a hardwired chassis and not PCB’s.

Answer:
Although the decoder is hard-wired, its is on a sub-chassis module. This module can be individually unplugged from the main chassis.

As I said earlier, I’m not familiar with this TV, simple’s when you know how.

August 6, 2017
11:00 pm
Alastair
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I have a CVC2 22″ table model set.

I can confirm that the decoder chassis can be removed complete and unplugged, (–although if I recall correctly, this isnt quite as easy as it sounds!), the chassis is very nearly completely point-point wired, although there’s a tiny PCB electrically between the IF Strip and the Tuner, this has a couple of Lockfits on–Maybe the source of the above mentioned fault. The main IF strip uses all TO-18 types as I recall, so are pretty robust…..

My set has seen quite some service and its CRT was quite tired, it was replaced by a much healthier one. Issues Ive found are the A1 pots being that open preset type chassis mounted things breaking with age, Ive got some proper pots to replace those with. Weird colour from one side to another of the screen was an electrolytic on the decoder, so they all got replaced, there’s only about 6 of them. Colour difference gain issues were the 10M PCL84 triode load resistors (a la Pye 691/7)

The cabinet also has its issues–the wood glue giving way as its now just so old, and the top of cabinet coming right off! Thankfully no serious damage done and it was repaired with little/no evidence of it ever happening.

Another issue is the focus voltage is derived from a huge Metrosyl device direct from the final-anode 25kV supply, the Metrosyl drifts in value as the set warms up, shifting focus for about an hour or so. Not sure what exactly to do to cure this, maybe add a more normal focus-pot from some later chassis…

–I’m guessing, that ITT are using this Metrosyl device in part to give a certain amount of EHT regulation–These sets were designed when lots of other makers were using PD500 shunt-regs and GY501 recs with overwinds, the ITT used a Tripler from day one so was pretty advanced, the rest of the line stage quite akin to the later CVC5– PL509, PY500A etc, but with a more sensible PL508 in field timebase. Personally, I always thought the use of PCL85/805 in CVC5/9 was a poor choice, and a backwards step…..

Since Ive moved house, the set now sits in the corner of the living-room, (Its a rather 60/70’s style house and fits right in) but has yet to be powered up here, A job for a Winter’s evening…

August 8, 2017
3:14 pm
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The_Teleman
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The metrosyl on these sets tended to absorb moisture , the best way around this is  to totally remove it from the set & bake in a low oven for an hour or 2 , also like the cvc5 it has a 2.2meg on the CRT base that can also cause this fault .

very nice set , I had one some years ago but it now resides with Gary ( colourmaster )

chris

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