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 Knowledge of HMV 886
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 Return to top of page · Post #: 1 · Written at 6:54:31 PM on 26 June 2010.
Duconbuster's Gravatar
 Location: Melbourne, VIC
 Member since 7 August 2009
 Member #: 526
 Postcount: 111

Does anybody have a schematic or knowledge of the HMV 886 wooden mantel dual wave radio?
Just like to verify the first valve closest to the antenna end of things.(converter)
A poor copy the diagram I have suggests it is 6J8G??

What's left of the writing on the valve looks more like 6A8G.

Which if either is likely to correct?

Markings on chassis cannot be read clearly either.
Radio is generally in poor shape but not without hope, besides it's wood so it's good!!
Anyone with a readable schematic can they send to Brad for posting for all to see in future if that's OK
Or send direct me at chev400jeep.yahoo.com.au

Thanks


 
 Return to top of page · Post #: 2 · Written at 7:10:32 PM on 26 June 2010.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 3796

Its got SW. Most of the time a SW set will use 6J8 as 6A8 is considered by Radiotron to be a BC valve.

This uses 6J8.

Marc


 
 Return to top of page · Post #: 3 · Written at 9:07:42 PM on 26 June 2010.
Gfr53's Gravatar
 Location: Harston, VIC
 Member since 28 February 2009
 Member #: 442
 Postcount: 145

Hi,

Check your inbox.

Cheers, Graham.


 
 Return to top of page · Post #: 4 · Written at 11:58:15 AM on 27 June 2010.
Duconbuster's Gravatar
 Location: Melbourne, VIC
 Member since 7 August 2009
 Member #: 526
 Postcount: 111

Thanks guys, your help is priceless as usual.
Used a bit of steam & dabbed paper towel over the valve ID to clean the muck off & I am more convinced the valve reads 6A8........assuming this would it have worked on BC band? As this is the band the set was always used on.

Can't see any signs of work being done underneath the unit in the way of mods etc.

Regards Paul


 
 Return to top of page · Post #: 5 · Written at 8:49:31 PM on 27 June 2010.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 3796

If you are lucky enough to have another 6A8 or 6J8, that can be seen through in strong light, then you may be lucky.

Alernative....

6J8 has the triode at the base of the hexode in a similar style to that of the diode plates of 6B7, 6B8 .

This can be seen as a rectangular box below the heptode. The octode has no such structure below it.

6A8 was used in some sets on SW, but there were issues, as stated in Radiotron Handbook.

Marc


 
 Return to top of page · Post #: 6 · Written at 00:09:50 on 7 August 2010.
Duconbuster's Gravatar
 Location: Melbourne, VIC
 Member since 7 August 2009
 Member #: 526
 Postcount: 111

Update to any interested.....Some progress has been made made on this radio...Caps have been replaced & just to assist others reading through articles on this forum....it isn't always the valves & caps that go defective.
Found most resistors way beyond what most would call acceptable tolerance for this era radio 16% or so.......

Interestingly the older style of "Dog Bone" shaped resistors were all OK, but all the newer post dog bone style carbon resistors were just about all stuffed....some totally open circuit & others even of the same value & colour code varied from 30-500% out of tolerance.......Nothing new to those experienced but my first encounter of this situation....
Cheers all
Paul


 
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