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 HMV Console TV info
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 Return to top of page · Post #: 1 · Written at 12:31:29 AM on 20 September 2013.
scorezero's Gravatar
 Location: Bentleigh East, VIC
 Member since 4 January 2012
 Member #: 1055
 Postcount: 39

Hi all,

I'm currently working on another HMV set, 21 inch TV, model M6 A7. Really nice set with the older style rounder tube. I have a picture and distorted, weak sound. I injected a direct audio signal into the set via the wiper terminal on the volume control, but no improvement. I have re-capped the set except the big can electros. I've yet to check them for ripple. The pic is quite good, but if there's a bright area on the screen, it leaves a horizontal streak like shadow behind it if the brightness is up just a bit too much. This can be adjusted out with careful tweaking of the brightness and contrast, but I suspect there's an issue. I'm still to go over the resistors, I've only replaced 2 so far, and a few others I've measured are a bit high (not miles off value though). I could add a bit more capacitance to the main cans by jumpering some new ones in parallel, haven't tried that yet.

One thing I've noticed is the the horizontal linearity is not perfect on the 2 HMVs I have. The grid lines are a bit stretched on the LHS of the screen, I'm wondering if its a design fault or I'm just lucky? You probably wouldn't notice it with a normal picture, but it would be nice to fix this if possible. I've already adjusted the HOR LIN in both sets, but I can only go so far.

If anyone has schematics, tuning instructions or any info at all on this set, I'd really appreciate it!

Cheers,

Adam


‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
"What's that big box by the back door? You didn't buy another old TV from eBay did you?"

 
 Return to top of page · Post #: 2 · Written at 3:32:10 AM on 20 September 2013.
Nathan Brown's Gravatar
 Location: East Maitland, NSW
 Member since 13 May 2013
 Member #: 1342
 Postcount: 243

I like your signature mate, and where are you? I'd love to see a B&W set in action! I'm not talking 1970s B&W though, 50s B&W Smile


‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
"I'd rather have a CRT than nothing" - me
"people just throw working CRTs out, it is NOT FUNNY!" -me

 
 Return to top of page · Post #: 3 · Written at 11:01:13 AM on 20 September 2013.
Brad's avatar
 Administrator
 Location: Greenwich, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 6663

...and where are you?

Locations are under the usernames for most members. Smile


‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
A valve a day keeps the transistor away...

 
 Return to top of page · Post #: 4 · Written at 2:19:00 PM on 20 September 2013.
Nathan Brown's Gravatar
 Location: East Maitland, NSW
 Member since 13 May 2013
 Member #: 1342
 Postcount: 243

Crap, he's in Vic, I'm in NSW Sad


‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
"I'd rather have a CRT than nothing" - me
"people just throw working CRTs out, it is NOT FUNNY!" -me

 
 Return to top of page · Post #: 5 · Written at 3:31:45 PM on 20 September 2013.
Brad's avatar
 Administrator
 Location: Greenwich, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 6663

Ahhhh the tyranny of distance...


‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
A valve a day keeps the transistor away...

 
 Return to top of page · Post #: 6 · Written at 3:54:50 PM on 20 September 2013.
scorezero's Gravatar
 Location: Bentleigh East, VIC
 Member since 4 January 2012
 Member #: 1055
 Postcount: 39

Hi Nathan,

I'm a member of the CRT group that Chris started on FB.
We've spoken about HMVs before!

Cheers,

Adam


‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
"What's that big box by the back door? You didn't buy another old TV from eBay did you?"

 
 Return to top of page · Post #: 7 · Written at 7:34:47 PM on 20 September 2013.
Nathan Brown's Gravatar
 Location: East Maitland, NSW
 Member since 13 May 2013
 Member #: 1342
 Postcount: 243

Yeah? Possibly you can post a YouTube vid of your HMVs in action?


‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
"I'd rather have a CRT than nothing" - me
"people just throw working CRTs out, it is NOT FUNNY!" -me

 
 Return to top of page · Post #: 8 · Written at 7:43:56 PM on 20 September 2013.
TV Collector's Gravatar
 Location: Ballarat, VIC
 Member since 4 January 2011
 Member #: 803
 Postcount: 456

Hi Adam,

I have the HMV M6 manual already scanned so I can email it to you. It is rather large at 21 MB so I'll need to send it in two lots.

Email me if that suits you.

The correct procedure to adjust the horizontal linearity is for minimum cathode current in the 6CM5. Failure to adjust this correctly can cause the line output transformer to run hot or even burn out so once you have the manual read up on this!

To correct the horiz scan linearity I think you need to adjust the magnets on the side of the deflection yoke. I'll need to look into this some more as it is rarely mentioned in the service manuals.


 
 Return to top of page · Post #: 9 · Written at 11:34:38 PM on 21 September 2013.
scorezero's Gravatar
 Location: Bentleigh East, VIC
 Member since 4 January 2012
 Member #: 1055
 Postcount: 39

Hi,

That would be great! I'm also glad you know about correcting the linearity. I think I read somewhere (probably this forum) about the magnets getting weak with age. I can always top them up so to speak.

I'll send you my details.

Cheers,

Adam


‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
"What's that big box by the back door? You didn't buy another old TV from eBay did you?"

 
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