C76 Barrier Insulator

[Mark Davis]

I just picked up another 400 and am planning on doing the modifications and upgrades like I did on the first one.

I did power it up with a DBT and Variac nothing came on.

I noticed can cap C76 (Cardboard covered one) was very loose in the socket so I shut it down.

I already ordered the new Can Caps from Hayseed Hamfest.

I was noticing the Barrier that the cap is in I guess it is fiber board is broken.

What should I use to replace this barrier or insulator?

I also noticed a wire had come loose. I hope this is why it didn't power up.

I hope after replacing the can caps it will at least power up to give me a staring point.

 

[jvstratman]

This?

https://www.tubesandmore.com/products/insulator-4-section-fp-can-capacitors

 

[Mark Davis]

Well that looks like it. Just need to check the diameter.

Thank You.

 

[dcgillespie]

Hayseed has them as well.

Dave

 

[gadget73]

^^ this, you can specify you need one on the HH order. Drill out the rivets and replace it with the can.

if the order is in but not shipped you can probably contact them and ask to have one stuck in with the caps.

 

[jvstratman]

Definitely HH if you're awaiting an order.

 

[Mark Davis]

It already shipped unfortunately. I wish I would have noticed earlier.

 

[jvstratman]

When drilling out the rivet don't make the hole larger. A 6-32 machine screw fits the existing hole perfectly. I used machine screws but had to grind the head diameter to insure it didn't make contact with the metal can under the cardboard sleeve which would be very bad.

Someone here used a different style fastener. Maybe a socket head cap screw? Was it gadget or larryderouin maybe.

I wish I'd read your entire thread. Sounds like I cost you shipping at AES. If so, and they haven't shipped yet, think I have a couple laying around. Let me know.

 

[larryderouin]

I use a 4-40 x 1/2 panhead with locktight red on the threads. The head on the screw is large enough to overlap the hole but small enough to stay a fair distance from the can.

 

[Mark Davis]

When drilling out the rivet don't make the hole larger. A 6-32 machine screw fits the existing hole perfectly. I used machine screws but had to grind the head diameter to insure it didn't make contact with the metal can under the cardboard sleeve which would be very bad.

Someone here used a different style fastener. Maybe a socket head cap screw? Was it gadget or larryderouin maybe.

I wish I'd read your entire thread. Sounds like I cost you shipping at AES. If so, and they haven't shipped yet, think I have a couple laying around. Let me know.

Hayseed Hamfest didn't ship my order yet so they are adding it to my order. Thanks for the offer.

 

[gadget73]

Button head cap screws look a little more like rivets. My local hardware store has them. #4 work well for tube sockets, the cap might want a #4 or #6 depending on the specific screw.