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 HMV TV PU-AF
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 Return to top of page · Post #: 1 · Written at 6:47:04 AM on 8 March 2017.
Jgasdj's Gravatar
 Location: Lake Macquarie, NSW
 Member since 1 April 2014
 Member #: 1539
 Postcount: 19

I recently acquired a HMV TV, not working, schematic was found in the back.

HMV PU-AF Television
HMV PU-AF Television


 
 Return to top of page · Post #: 2 · Written at 9:37:57 AM on 8 March 2017.
Vintage Pete's avatar
 Location: Cromer, NSW
 Member since 1 May 2016
 Member #: 1919
 Postcount: 564

What model HMV is it? I have a couple of HMV models . The Lowboy from the 50s is nice looking set, are you intending to restore the set?
All the best, pete


 
 Return to top of page · Post #: 3 · Written at 5:15:32 PM on 8 March 2017.
Ian Robertson's Gravatar
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 578

PU-AF as I recall was the last of the non solid state models, using the DECAL (10 pin) valves - 6X8, 6U9, 6Y9.

MSP deflection components, stabilised EHT, CRTs by Thomas. Philips tuner.

A good, stable, solid performer, reliable and easy to work on, they were very popular - I must have fixed hundreds of them.

With only 2 stages of vision IF, the 6U9 and 6X9 were pushed hard and would go low emission. Will probably need to be replaced.

Cathode bias for the vertical (6GV8) often used two Ducon 1k 1 watt composition resistors in parallel These would go low resistance and stress the valve. Should be checked. The Morganite resistors were OK.

Rolling picture on switch-on - 6GV8.

Crackles in the audio - 6GW8.

That was about it for stock faults on this chassis! Apart from the usual 6AL3 and 6CM5 failures of course.

No paper caps in this chassis so there's no need to recap it.

Don't worry about wax dripping from the EHT transformer. They all did that but I can't recall ever having to replace one.


 
 Return to top of page · Post #: 4 · Written at 10:39:02 PM on 8 March 2017.
Brad's avatar
 Administrator
 Location: Greenwich, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 4322

Photos uploaded.


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

A valve a day keeps the transistor away...

 
 Return to top of page · Post #: 5 · Written at 11:40:08 PM on 8 March 2017.
Vintage Pete's avatar
 Location: Cromer, NSW
 Member since 1 May 2016
 Member #: 1919
 Postcount: 564

I know that model. Hey its missing a knob and there is a guy on ebay who is selling a box of tv knobs and last I looked the box was 14 bucks, I looked at it and saw nothing I needed because they were not 50s knobs, but you might find your missing one in there. The search was vintage tv, I will see if I can get a link for you.
Pete

Edit
This should get you there.
Look at this on eBay http://www.ebay.com.au/itm/282383901393


 
 Return to top of page · Post #: 6 · Written at 7:41:19 PM on 9 March 2017.
Brad's avatar
 Administrator
 Location: Greenwich, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 4322

It's probably worth knowing that HMV gave most of their tellies nicknames and that one was called the Wentworth.


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

A valve a day keeps the transistor away...

 
 Return to top of page · Post #: 7 · Written at 9:33:57 AM on 10 March 2017.
Ian Robertson's Gravatar
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 578

Yeah, there's a big lump of concrete bolted into the base of the cabinet at the back to stop the set falling over when the chassis was removed!!!

True!


 
 Return to top of page · Post #: 8 · Written at 5:31:44 PM on 10 March 2017.
Vintage Pete's avatar
 Location: Cromer, NSW
 Member since 1 May 2016
 Member #: 1919
 Postcount: 564

.Ian.
Yes I have to make a Ballast for weight on my 1962 kriesler its front face heavy and its very heavy. Not safe with kids in the house.

All the best pete


 
 Return to top of page · Post #: 9 · Written at 9:47:15 AM on 1 April 2017.
Ian Robertson's Gravatar
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 578

First TV my family had when I was a kid was a Pye with the short-lived T20 chassis. It was the pre-cursor to the T21 that moved most of the circuitry onto a large PCB.

EHT transformer failed under warranty.

Reason I mention it is it had a much better solution for falling over when the chassis was removed. Necessary because the 23HP4 bonded faceplate CRT made it front heavy.

Inside the cabinet, screwed to the front face was one of those push-down door stop latches with appropriate warning label stuck alongside it. Simple, effective, not heavy!

I also recall being disappointed but surprised by the audio.in that set. It was a console with a huge speaker baffle that looked as though there would have been an 8" speaker behind it. The first time I looked I found it was actually with a tiny 4" Magnavox speaker - the same puny little thing they used in their smaller cabinets! When I say surprised, it sounded much better than you would think it might. Amp was half a 6DX8, FM from 6DT6 "syntector" circuit. Simple but effective, like the rest of the set.

Only other problem that set ever had was the rotor shaft nut working loose inside the tuner.


 
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