View Full Version : Halolight flyback?

10-19-2017, 12:16 PM
I recently picked up a Halolight but unfortunately it wonít 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.

10-19-2017, 02:10 PM
i might have a thordarson 76 , ill look tonight.

10-19-2017, 10:14 PM
Thanks for looking Steve.

10-19-2017, 11:01 PM
sorry, thought i might have one ,been collecting as many as possible .

Eric H
10-20-2017, 02:47 AM
Does it look like this?

10-20-2017, 11:36 AM
That’s it!

Eric H
10-20-2017, 12:53 PM
It's yours for shipping if you want it.
P.M. me with your address and I'll get it sent.

10-20-2017, 01:23 PM
Wow, thanks Eric!

10-20-2017, 09:08 PM
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.

10-23-2017, 08:37 PM
Part received, thanks again Eric. Any chance there’s a wiring diagram for the HVO-54? Not really sure how it goes in.

Eric H
10-23-2017, 10:10 PM
Part received, thanks again Eric. Any chance thereís 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.

Kevin Kuehn
10-23-2017, 10:17 PM
If someone has a Merit catalog it likely would show their fly types schematically with the terminals numbered.

10-23-2017, 10:45 PM
Never mind, there was a terminal conversion chart in the back of the Sams. Next issue is Iíve only got 6kv, Iíll play with it a little more this weekend.

11-06-2017, 09:53 AM
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.

Eric H
11-06-2017, 11:49 AM
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?

11-06-2017, 01:19 PM
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

11-06-2017, 01:40 PM
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.

11-07-2017, 02:17 PM
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).

Crist Rigott
11-08-2017, 07:48 PM
Do you happen to have a Ram p/n that you need. My buddy has a lot of Ram fly backs.

Dave Tilotta
11-09-2017, 08:51 PM
As an FYI, here's what my catalog has.

11-09-2017, 09:36 PM
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.

Crist Rigott
11-10-2017, 10:25 PM
Thanks Nick. Next time out we'll look for one and let you know.

11-11-2017, 03:45 PM