Halolight flyback?
 

I recently picked up a Halolight but unfortunately it won’t make any HV and fails ring test after recap. If anyone has a Merit HVO-54, Thordarson FLY-76, Triad D-49 or other suitable replacement please let me know. Chassis is a 1-533-8.

i might have a thordarson 76 , ill look tonight.

Thanks for looking Steve.

sorry, thought i might have one ,been collecting as many as possible .

Does it look like this?

http://videokarma.org/attachment.php...1&d=1508482050

That’s it!

It's yours for shipping if you want it.
P.M. me with your address and I'll get it sent.

Wow, thanks Eric!

Just to make double sure the old fly is bad I subbed in an air core HV transformer, which immediately made a nice fat arc. So the old fly is definitely bad, must have a primary short since it’s all discolored in that area like it got really hot.

I’ll post a shot of this set running next to my Saratoga, soon as I get a decent picture on it.

Part received, thanks again Eric. Any chance there’s a wiring diagram for the HVO-54? Not really sure how it goes in.

No, I looked through the box it was in and didn't find it.

If someone has a Merit catalog it likely would show their fly types schematically with the terminals numbered.

Never mind, there was a terminal conversion chart in the back of the Sams. Next issue is I’ve only got 6kv, I’ll play with it a little more this weekend.

HVO-54 is installed and working, but it’s only making around 7kv of anode voltage. Anyone know if this particular fly is OK to use with low B+ chassis, or does it need 385v like other sets? Sweep width is good, output tube draws around 160ma, just low HV.

I noticed that Fly had been soldered on before I sent it to you, I wonder if it could have been a dud from the beginning?

Have a ? . Did you ring the fly you got from Eric H. It could be the wrong one or fil. voltage for the 1B3 is low or the 4.7K resistor in hv line is way high in value don't forget the 15 ohm resistor that's between the damper section and H. output plate section of the flyback. All the best, Tom.J

I don’t think so Eric, if there were anything wrong with it then it would have failed ring test or not worked at all. Boost voltage is low as well, there’s not much bootstrapping action going on. That’s what leads me to believe it needs more B+ in the first place, but I know nothing without seeing the spec sheet. I could see this exact thing happening if a fly was fed half the voltage it should have, but again I need proof.

Maybe you have the horizontal output tube plate connected to a wrong terminal, in that the output pulses are going thru too much of the flyback coil. That would lead to lower high voltage and lower boost... :scratch2:

Check with an ohmmeter (with the set off) and see if you find a terminal around half the resistance than that you have the output tube plate connected to. That terminal might be the one to use. If you do change something, test fire up the set and measure the voltages to see if they are closer to correct, and check the cathode current of the output tube (and check that the tube isn't red-plating).

Nick,
Do you happen to have a Ram p/n that you need. My buddy has a lot of Ram fly backs.

As an FYI, here's what my catalog has.

http://i63.photobucket.com/albums/h1...psmlsnvpb5.jpg
http://i63.photobucket.com/albums/h1...psd7awljel.jpg

Crist, Ram number shown in Sams is X-129.

Dave, thank you for the info. I’ll compare it to what I have in the chassis, to see if it makes sense.

Thanks Nick. Next time out we'll look for one and let you know.

Thanks!

Crist, any chance you found a compatible flyback? Unfortunately the Merit one I got from Eric is no good, the outermost part of the HV donut is overheating for some reason.

Nick,
No joy on the RAM part number. Can you provide the Sylvania part number?

I've got these 2 Admirals that are apparently close to the HVO 54. The first is new but I only see 3 terminals? No spec sheet either. Second is a pull from a mid 50's Admiral chassis 21A3Z ( Sams 275-2). You can try one or both for postage. If it fixes your problem I'd take a 10 buck donation, or not. :)

https://c1.staticflickr.com/5/4731/2...b8e6c474_b.jpg

https://c1.staticflickr.com/5/4601/3...dd1b153a_b.jpg

https://c1.staticflickr.com/5/4588/3...a861b768_b.jpg

https://c1.staticflickr.com/5/4638/3...305d9e54_b.jpg

Kevin, PM sent!


Crist, the Sylvania number listed in Sams is 241-0042 or 241-0037 depending on the chassis. Not sure what difference it makes.

What year is that Sylvania and the chassis number? CRT type?
The Admiral fly shown is for a set with 90 degree sweep and 21AMP4!

I think I see your point.
Both Sylvania part numbers Nick lists cross to Fly 171, vs the Admiral 79C60-2 crosses to Fly 76, and the 79C60-5 to a Fly 77.
Lets make sure the deflection angles match before we make a donation to the USPS.

OK, I looked up your chassis 1-533-8 in Sams 352-16, and it does appear to be a 90 degree deflection CRT. I'm sure you knew that. ;)

I don't know why your OEM fly numbers cross to a Fly 171 in my Thordarson reference, but it could be something as simple as an extra tie-point terminal.

Another piece of info... I have the 1969 Merit Replacement Guide cross reference, and both 241-0037 and 241-0042 cross to Merit HVO-124. Maybe the Sams is wrong, or the HVO-54 was the best match at the time and Merit came out with an exact match after the Sams was published. I don't have the catalog to compare the specs.

https://c1.staticflickr.com/5/4638/2...6e1b941f_z.jpg

https://c1.staticflickr.com/5/4683/3...90d0504b_z.jpg

Hmm. HVO-124 also crosses to Thor Fly 171. :scratch2:

The fly-171 looks closest, even shows the RFC on the plate lead of the HOT.

Watching this thread; I have my Halolight on the bench now, no HV, no B-boost, damper is red plating. Hmmm...

Your oscillator probably isn’t running, got a scope?

I do...sometime over the weekend I'll due some probing in that circuit.

Is it recapped?

With no drive, the horiz output would be the one red plating.
To get the damper red plating, you would almost have to have drive on the HO tube. It still doesn't hurt to scope the drive on the HO. There must be a problem in the boost circuit.
It's been ages since I had to trouble shoot this circuit. :scratch2:

Sounds like a hard short-to-ground somewhere on the cathode side of the damper.