Hi there.
I bought a pair of Hammond 194E chokes to replace a pair of 175G (of lower rating) that I have on my home made amp. Both models are open frame types.
The new chokes are larger (EI-76 lamination) and wouldn't fit comfortably in my chassis, so I decided to remove the frame and replace it with end bells that I found on eBay so I can mount the components vertically.
While removing the frames, some of the varnish came off the core. The tool I used scratched off some of the gray paint on the core too. I also noticed that the top part of the lamination is detached from the "E" frame by means of a plastic layer on each side.
A couple of questions:
Is there any particular varnish that you suggest using to seal the chokes? I was thinking about plain clear spray paint.
Is it OK for the two parts to be just kept together by the end bells, or are any possible gaps an issue? (I imagine that if the end bells fit exactly there shouldn't be any gap except for the plastic separators that were in place already, but I haven't received them yet and cannot tell).
Any other advice on this?
Thanks.
I bought a pair of Hammond 194E chokes to replace a pair of 175G (of lower rating) that I have on my home made amp. Both models are open frame types.
The new chokes are larger (EI-76 lamination) and wouldn't fit comfortably in my chassis, so I decided to remove the frame and replace it with end bells that I found on eBay so I can mount the components vertically.
While removing the frames, some of the varnish came off the core. The tool I used scratched off some of the gray paint on the core too. I also noticed that the top part of the lamination is detached from the "E" frame by means of a plastic layer on each side.
A couple of questions:
Is there any particular varnish that you suggest using to seal the chokes? I was thinking about plain clear spray paint.
Is it OK for the two parts to be just kept together by the end bells, or are any possible gaps an issue? (I imagine that if the end bells fit exactly there shouldn't be any gap except for the plastic separators that were in place already, but I haven't received them yet and cannot tell).
Any other advice on this?
Thanks.
The gap will be an issue between the I bae and E stack, as it defines the inductance of the choke. The frame held the I bar and the "E" stack tightly together - you won't get the same clamping action from the end bells. You might want to use fa few wraps of tape to hold the I bar and E stack together, though varnish impregnation might also be holding them together.
That's good to know, thanks. I haven't removed the original spacers, so anything that can clamp the two pieces together should keep the same distance. I might use a combination of tape and epoxy resin (better than spray paint) as you suggested to keep them in place.