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 HG Palmer B&W TV schematic
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 Return to top of page · Post #: 1 · Written at 2:05:39 PM on 25 October 2017.
Bolster's avatar
 Location: Lawson, NSW
 Member since 10 August 2017
 Member #: 2149
 Postcount: 6

Hi All,
I'm in need of the schematic for an HG Palmer B&W TV.

This set was the family TV for years until replaced by a colour set in the late 1970s. Plan is to restore to operation.

According to the label on the back, the model # is: YPK with serial #: 1071

CRT is 21"& has a fold down chassis & is a timber lowboy model with speaker in bottom part of cabinet.

I'll see what other details I can get, though any info that can be provided by other members would be appreciated.


 
 Return to top of page · Post #: 2 · Written at 9:25:55 AM on 26 October 2017.
Ian Robertson's avatar
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 624

If the chassis folds down, it will be a Calstan by KG Harris. I have all the schematics for these.

The HG Palmer model number doesn't mean much to me.

Are you sure it's a 21" and not a 23"? AFAIK, by the time the 1.01 chassis appeared (i.e. the first flip-down chassis) the 21" tubes were just about finished. Look for the type number on the CRT label.

Some models after the 1.01 chassis had unstabilised EHT (as a cost cutting exercise) and as a result the Philips EHT transformers would often go shorted turns. Assuming yours is good, you'd want to add stabilisation to your set to both protect the transformer (you won't get another one) and stabilise the picture against size changes with brightness. It's an easy mod and well worthwhile.

When I have a look at the circuits I could ask you some questions to help identify the chassis. Alternatively, look for a black ink stamp on the chassis with 1.01 or 1/01 or 1/03 or something like that.

These are a cheap, simple design that nevertheless can be made to perform well. The later service mods improved them quite a bit.


 
 Return to top of page · Post #: 3 · Written at 5:42:39 PM on 28 October 2017.
Bolster's avatar
 Location: Lawson, NSW
 Member since 10 August 2017
 Member #: 2149
 Postcount: 6

Hi Ian,

You were right about the CRT, it's an AW59-90. (23.6") I should have checked the CRT label rather than just measuring the CRT face.

I have been all over the chassis & cannot locate a black ink stamp any where either valve side or component side.

Would the valve line-up help or a photo of the chassis?

Thanks.


 
 Return to top of page · Post #: 4 · Written at 12:20:49 PM on 29 October 2017.
Ian Robertson's avatar
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 624

Yes, well regarding the chassis stamp, KGH were a small company and a bit slack with their documentation. I reckon they tended to release some partly-modified experimental chassis from time to time...

I'd say HG Palmer would screw them on price as well. Surprising they survived the HGP collapse and the credit squeeze, Stromberg Carlson didn't....

We can reduce it down a bit:

1. If there is a removable aluminium "hat" on the last VIF transformer it will be a 1.02.
2. If the tuner has a fine tuning knob in the middle of the channel knob (rather than around the outside) it will be a 1.02 or later. The 1.02 had improved sound takeoff and better AM rejection.
3. The 1.03 chassis has only 2 stages of vision IF using a 6BY7 and a 6AM8. The vertical is a 6GV8. I don't have a circuit for this low-cost model or for the 1.07, which used Decal valves (6U9, 6X9, 6Y9) in the IF and video. The 1.07 came well after the HGP collapse so we can rule that out.
4. The 1.06 was basically a modified 1.02 with improvements like proper horizontal AFC using diodes, horizontal blanking etc.
5. Actually the only full circuit I have is for the 1.01. Later models are documented with amendments to that chassis. The vision IF lineup is 6EH7, 6BL8, 6BL8 and audio OP was a 6BM8.

My email address isn't hidden. Drop me an email, send me some pics and I'll send you what I have.


 
 Return to top of page · Post #: 5 · Written at 8:33:48 AM on 30 October 2017.
Bolster's avatar
 Location: Lawson, NSW
 Member since 10 August 2017
 Member #: 2149
 Postcount: 6

Thanks Ian,

The chassis sketch I did with the valve layout is exactly as you have indicated for the 1.01 chassis.

I'll email you a picture of the chassis with the valves labelled.

Thanks for the help, much appreciated.


 
 Return to top of page · Post #: 6 · Written at 7:41:11 PM on 30 October 2017.
Bolster's avatar
 Location: Lawson, NSW
 Member since 10 August 2017
 Member #: 2149
 Postcount: 6

Hi Ian,

I can't access your profile information for your email, I'm getting: 500 - Internal server error.


 
 Return to top of page · Post #: 7 · Written at 7:58:10 PM on 30 October 2017.
Brad's avatar
 Administrator
 Location: Greenwich, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 4398

All fixed. Profiles are once again available.


‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
Brad.

A valve a day keeps the transistor away...

 
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