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 Radio Reception dramas.
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 Return to top of page · Post #: 16 · Written at 11:23:41 AM on 1 May 2019.
STC830's Gravatar
 Location: NSW
 Member since 10 June 2010
 Member #: 681
 Postcount: 1301

Re the antenna in Pete's last post. Looks like he has made a longwire antenna with coax feed out of a doublet kit.

Just shows an outside antenna is better than most antennas inside. It looks a bit close to the roof but if the roof is bitumen without any foil in it, it may have effective height. Might not work so well on my corrugated steel roof.

But who knows - the most important thing is high signal to noise ratio. Low noise generally is more important than high signal. It is certainly unobtrusive if the neighbours are likely to object.


 
 Return to top of page · Post #: 17 · Written at 6:43:51 PM on 1 May 2019.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 5389

I am often sceptical of some of those filters as to what they filter out. Very effective if they kill all of the signal.

Any regulations regarding electrical interference are now not worth the paper wasted printing them. The greatest generator of RFI is the switchmode power supply and they are a plague. They are in computers, FAX machines, wall warts, fridges, washing machines and many forms of lighting. CFL's are a major source & I do wonder why they are needed in some devices.

I have mentioned that I took two LED flood lights back to point f sale as they both generated that much RFI they drowned out the RFI from the NBN box. You can buy Ferrites & some cables have them already on them to stop some of the line noise from the mains. As mine is RF from many Radio stations, I have found Line capacitors effective. Albeit I also use MOV's for the lightning.

Interesting I have just received a 11-xx that was found a few days ago. First one I have seen in yonks with a perfect script on the front... Dial is missing. It also came with a sixties transistor. I will take photos as both will be looking for a home.

Marc


 
 Return to top of page · Post #: 18 · Written at 9:51:14 PM on 1 May 2019.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 5389

I have slipped to cover s on this Kriesler as I want the hole centres of the scroll work on the front; The aim being to see if I can duplicate it. That may end up being laser scanned to get the absolute precise dimensions.

Now to go with my snipe at Kriesler's having a propensity to destroy OP transformers. This is one of the six, the speaker transformer is a goer but neither it or the speaker are original. On top of that the speaker is oval, on what looks like a new frame: Fine, it works so I leave it.

Some knobs are not original & there is a switch across the link? Monkey? Choke says 11 Nov 1950. So in response to a recent post, this has 6AN7; 6SQ7; 6SK7; EL33; 6X5. Other than the speaker & transformer, The green paint suggests its never been touched. So there's a ready made, layout diagram. Dial glass is missing. I need to work out which one it had, as I may have one?


 
 Return to top of page · Post #: 19 · Written at 5:51:05 AM on 2 May 2019.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6761

to go with my snipe at Kriesler's having a propensity to destroy OP transformers.

As per recent discussion on this involving post mortems on OP transformers, it's more likely the fault of the transformer manufacturer than anything Kriesler has done (other than choosing that OPT manufacturer).


 
 Return to top of page · Post #: 20 · Written at 6:32:43 AM on 2 May 2019.
STC830's Gravatar
 Location: NSW
 Member since 10 June 2010
 Member #: 681
 Postcount: 1301

" Dial glass is missing."

The valve lineup indicates an 11-7J which is series 2 which I think means the dial with the SW across the bottom with a dark brown band behind it.


 
 Return to top of page · Post #: 21 · Written at 7:18:30 AM on 2 May 2019.
Vintage Pete's avatar
 Location: Albury, NSW
 Member since 1 May 2016
 Member #: 1919
 Postcount: 2048

Regarding Kriesler / Rola op transformers, I sent 2 off to be rewound back to spec at Vintage Radio Transformers in Victoria, ! I'm Very happy with the job he did and it was not expensive . Really did a nice job on them .
As for Kriesler Radio dial Marcc , I don't have any because all my Kriesler parts relate to radiograms .

Pete


 
 Return to top of page · Post #: 22 · Written at 7:55:33 AM on 2 May 2019.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 5389

Four RF coils & the switch says its definitely SW. Tubes & more USA dis sell new Bobbins, but how much to get them here & locally some seem to want charge twice the inflated price. We are contemplating ridding ourselves of them stored here & I think one is a Kriesler?

As for OP transformers in repairing the electrical's of hundreds of sets, one gets to be able to predict what will be wrong with particular models & brands. Kriesler is by far the leader brandwise in wiping out OP transformers in setts I have fixed. There is also a tarred variety in HMV Nippers that comes a close second.

Also in Nippers some genius changed two parallel 22K screen resistors to what I believe is a 1Watt 10K thereby allowing I squared R to prevail & gradually cook it.

Tasma in some sets did exacerbate insulation failure by having heater wire of too low a gauge & not splitting it up to shed the load on it.


Marc


 
 Return to top of page · Post #: 23 · Written at 9:43:04 AM on 2 May 2019.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6761

Kriesler is by far the leader brandwise in wiping out OP transformers in setts I have fixed.

So what exactly are you claiming that Krielser itself did?


 
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