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Forum 135

Pam TV

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PYE625
(@pye625)
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Hello again, I think this set is a Pam 500 but it certainly bears a distinct resemblance to the Pye CTM17. I could be totally wrong of course. In any case, I go down to High Wycombe in Bucks to collect it this Friday. I placed an offer of £30 and it was accepted.

Here are the vendor's photo's for the time being, perhaps you could shead some light upon it's correct identity? ? 

s l1600c
s l1600
s l1600b
s l1600a

 

To understand the black art of electronics is to understand witchcraft. Andrew.

 
Posted : 23/11/2019 11:24 am
PYE625
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I believe it to be a PAM 517 from 1957, it certainly appears very similar to the lower set pictured here.

Ad PAM ModelRange 50

 

To understand the black art of electronics is to understand witchcraft. Andrew.

 
Posted : 23/11/2019 12:34 pm
Till Eulenspiegel
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Hi Andrew,  not sure about the model number but it'll be a Pye CW17 clone.

The cabinet should polish up really well. Rather nice style, let's call it good taste.

Till Eulenspiegel.

 
Posted : 23/11/2019 1:10 pm
Till Eulenspiegel
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According to the information in the 1958/59 Radio and Television servicing book the Pam 517F is electrically similar to the Pye CTL58F.    The CRT is the magnetic focus 90* Mullard MW43-80.

Till Eulenspiegel.

 
Posted : 23/11/2019 9:01 pm
PYE625
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Thanks Till, I think it is more likely similar to a CW17 like you said earlier.

All will be revealed Friday hopefully. ? 

To understand the black art of electronics is to understand witchcraft. Andrew.

 
Posted : 23/11/2019 9:27 pm
PYE625
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As a slight aside, I wonder how it is possible to search exclusively on here for Pam or Pye model post's ?

I admit I'm not the brightest spark on the anode cap, but does the google search box on the upper right bring up all post's applicable to specific makes here?

I think it does, so ignore my waffling.

To understand the black art of electronics is to understand witchcraft. Andrew.

 
Posted : 23/11/2019 10:56 pm
PYE625
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I forgot to mention that the vendor of the set has already powered it up. ARRRRGH!

MAKES A HUMMING SOUND / SCREEN DOES NOT LIGHT UP / SCRATCH TO DOOR / NOT CLEANED

I do hope that there is no real damage caused by this, but it is what it is.

To understand the black art of electronics is to understand witchcraft. Andrew.

 
Posted : 24/11/2019 9:12 pm
Nuvistor
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Tough old sets, hopefully all ok.

 

Frank

 
Posted : 24/11/2019 9:29 pm
PYE625
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The set arrives home today with me safe and well.

A quick visual before a nice cup of tea reveals it is a PAM 764. It looks the same as the PYE CW17 chassis. A Cathodeon CRT is the order of the day too......

IMG 5301 50
IMG 5300 50
IMG 5302 50
IMG 5304 50
IMG 5303 50
IMG 5306 50

To understand the black art of electronics is to understand witchcraft. Andrew.

 
Posted : 29/11/2019 1:42 pm
Nuvistor
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Is that Oct 56 printed on one of the electrolytics? Elpico valves, forgotten all about those.

 

 

 

Frank

 
Posted : 29/11/2019 2:30 pm
PYE625
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Yes, Oct 56. Looks like the EY86 has been replaced at some point, all others seem to be Mullard.

Out with the B&K CRT tester and things look promising on initial testing.

The CRT is attached to the cabinet, so the chassis will be removed for some further cold checks plus some cleaning.

IMG 5308 50
IMG 5307 50

Earlier in the week, I took a gamble on buying a likely service manual.... luckily, it would seem to be suitable for this set. It was only £6, so even if not, it was worth having.

IMG 5309 50
IMG 5310 50

To understand the black art of electronics is to understand witchcraft. Andrew.

 
Posted : 29/11/2019 3:00 pm
PYE625
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With the chassis removed, a general inspection reveals nothing too sinister. The main smoothing can might have expired, but I will see about this later. The LOPT would appear to be in very good visual condition. There are quite a number of Hunts capacitors dotted around, as you might expect.

IMG 5317 50
IMG 5311 50
IMG 5312 50
IMG 5320 50

To understand the black art of electronics is to understand witchcraft. Andrew.

 
Posted : 29/11/2019 3:37 pm
Nuvistor
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It can’t have been used very often, very little dirt. The tuner looks like an incremental not turret, find out when the can comes off.

 

Frank

 
Posted : 29/11/2019 4:18 pm
PYE625
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All will be revealed shortly re the tuner Frank, but in the meantime I have cleaned the chassis. There are two rubber grommets that support the tuner and they have perished and need to be replaced. The LOPT is supported on similar grommets and these are perfectly fine though.

I simply couldn't help myself fitting a Mullard EY86 in the EHT compartment.

In the last picture, a PL83 pentode is used for the frame output. This valve was really meant for video amplifying use, quite why a PL82 wasn't used I really don't know..

IMG 5325 50
IMG 5326 50
IMG 5331 50
IMG 5329 50

 

To understand the black art of electronics is to understand witchcraft. Andrew.

 
Posted : 29/11/2019 6:18 pm
Nuvistor
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It has a high voltage EHT capacitor and a CRT with Aqua dag, replacement CRT?

 

Frank

 
Posted : 29/11/2019 6:25 pm
PYE625
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Who know's Frank, but I hope that capacitor is OK as it forms the mount for the EY86.

To understand the black art of electronics is to understand witchcraft. Andrew.

 
Posted : 29/11/2019 6:35 pm
Nuvistor
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Just missed the edit window but a similar circuit from the library show both items connected. Pye CTM17.

 

Frank

 
Posted : 29/11/2019 6:50 pm
PYE625
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Here are some pic's of the inerior of the tuner Frank.

IMG 5333 50
IMG 5332 50

Upon testing of the main smoothing can, it was soon realised why the previous owner obtained nothing but hum. Both sections are open circuit. It will have to be replaced.

IMG 5334 50

I thought I had a suitable replacement, but do not. Luckily, the one pictured below on ebay will soon be winging it's way in my direction and is an exact replacement. For £3.95 plus postage, I can hardly grumble !  ? 

s l1600

To understand the black art of electronics is to understand witchcraft. Andrew.

 
Posted : 29/11/2019 8:21 pm
PYE625
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Returning to the tuner, I replaced the perished and collapsed grommets that support the rear of the tuner. I didn't have the correct type, so had to improvise by cutting another grommet and using the two halves to increase the height. The front of the tuner relies solely for support via a larger grommet through which the control spindle goes through. This grommet is still ok.

I don't know about you, but I can never seem to locate a source of suitable grommets of the correct height. For this application, but namely for tuning gangs of radio set's.

In the second picture, you can see the bodge. I am too fussy, but I hate this kind of thing.

IMG 5336 50
IMG 5335 50
IMG 5337 50

To understand the black art of electronics is to understand witchcraft. Andrew.

 
Posted : 30/11/2019 10:15 am
PYE625
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I found some spring washers and together with a plain washer, they do the same job as before, but to me they look better.....

IMG 5339 50
IMG 5338 50

To understand the black art of electronics is to understand witchcraft. Andrew.

 
Posted : 30/11/2019 11:29 am
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