Hiwatt DR103 blowing fuse
Moderators: pompeiisneaks, Colossal
Hiwatt DR103 blowing fuse
Hi. I am just about finished with my take on the Hiwatt DR103. Problem is I am blowing the fuse and the light limiter lights up. When I disconnect the secondaries from the rectifiere, the light is dimmed. I am using two transformers from Hammond, and the reason is I had them. Could it be that these transformers aren't working on yhis build? I fail to see what the cause good be at this time.
You do not have the required permissions to view the files attached to this post.
Re: Hiwatt DR103 blowing fuse
It would be helpful for you to clarify what exactly your take on a dr103 entails, eg a schematic.
My band:- http://www.youtube.com/user/RedwingBand
Re: Hiwatt DR103 blowing fuse
This one...
You do not have the required permissions to view the files attached to this post.
-
- Posts: 3110
- Joined: Sun Jul 22, 2007 7:48 pm
- Location: Mobile, AL
- Contact:
1 others liked this
Re: Hiwatt DR103 blowing fuse
I bet you connected the HT center tap (yellow wire) to ground. If so, disconnect the CT and tape it off. It's not needed and you can't connect it to ground and also connect the FWB rectifier to ground.
It's also very likely that the FWB is now defective because of this wiring error. Check all four diodes. Two of them are probably bad now.
https://el34world.com/charts/Schematics ... _dr103.pdf
It's also very likely that the FWB is now defective because of this wiring error. Check all four diodes. Two of them are probably bad now.
https://el34world.com/charts/Schematics ... _dr103.pdf
Re: Hiwatt DR103 blowing fuse
sluckey wrote: ↑Wed Jun 09, 2021 11:28 am I bet you connected the HT center tap (yellow wire) to ground. If so, disconnect the CT and tape it off. It's not needed and you can't connect it to ground and also connect the FWB rectifier to ground.
It's also very likely that the FWB is now defective because of this wiring error. Check all four diodes. Two of them are probably bad now.
https://el34world.com/charts/Schematics ... _dr103.pdf
You are right Sluckey. two of the diodes are dead. By yellow, do you mean the Ct from the secondary high voltage?
Re: Hiwatt DR103 blowing fuse
When I connect the rectifier like shown on the pic, the bulb limiter doesn't glow like chrismas, but glows as if the voltage is ok. Any views on this?
You do not have the required permissions to view the files attached to this post.
Re: Hiwatt DR103 blowing fuse
So why those the former way blow fuses, but not the latter?
Re: Hiwatt DR103 blowing fuse
Didn't you originally have the PT yellow wire connected to ground?
Re: Hiwatt DR103 blowing fuse
Yes I did. I took it away, but it still blew the fuse.
I have some trouble understanding the DR103. Now I get 500v (aprox) on two filtercaps, but only about 16v on th b3 and b4? And very little voltage on the power tubes, but heaters work.
And the grounding circled in the pic, is that the way to do it?
I have some trouble understanding the DR103. Now I get 500v (aprox) on two filtercaps, but only about 16v on th b3 and b4? And very little voltage on the power tubes, but heaters work.
And the grounding circled in the pic, is that the way to do it?
You do not have the required permissions to view the files attached to this post.
Re: Hiwatt DR103 blowing fuse
Yes, the picture shows how the presence and bias grounds were wired on all original Hiwatts.
Did you check all four diodes?
Did you check all four diodes?
Re: Hiwatt DR103 blowing fuse
Yes, make sure you're getting the expected voltage from the secondary (while disconnected) before troubleshooting further down the line.