Bottlehead Forum

Bottlehead Kits => Eros Phono => Topic started by: Tom-s on May 15, 2021, 06:05:00 AM

Title: Cover on shunt regulator 12AU7 tube
Post by: Tom-s on May 15, 2021, 06:05:00 AM

Is it ok to use a similar tube socket / cover on the 12AU7 as are already in place for the other tubes?

Or would this introduce unwanted hum?

Title: Re: Cover on shunt regulator 12AU7 tube
Post by: Paul Birkeland on May 15, 2021, 06:05:50 AM

Yes, you can put a shield over it if you like.  The 12AU7 in the Eros runs pretty hot and doesn't otherwise benefit from the cover, so we don't use one there.

Title: Re: Cover on shunt regulator 12AU7 tube
Post by: johnsonad on May 15, 2021, 07:28:34 AM

You can use an IERC tube cooler.  I use these on all of the tubes that can fit them.  They work and theoretically extend tube life by lowering the operating temperature.  Mostly I use them because I like the way they look :)
 

Title: Re: Cover on shunt regulator 12AU7 tube
Post by: Doc B. on May 15, 2021, 09:01:37 AM

Yes, if you use an IERC tube shield on a socket without the bayonet base it will only be serving as a cooler, not a shield. It is designed to work with a bayonet base and needs to make electrical contact with the chassis thru the base to be effective as a shield.

Title: Re: Cover on shunt regulator 12AU7 tube
Post by: Tom-s on May 16, 2021, 09:58:13 AM

Thanks for all the replies as always.

During assembly this plan  was scrapped. Unfortunately the covers that originally came with the Mainline (the one i planned to use as a fourth), were a different build from the ones provided with the Eros.

So. No cover today.
Awkward angled picture attached.

Title: Re: Cover on shunt regulator 12AU7 tube
Post by: johnsonad on May 17, 2021, 01:48:51 AM

It looks great!  Enjoy!

Title: Re: Cover on shunt regulator 12AU7 tube
Post by: Karl5150 on May 17, 2021, 02:35:55 AM

The plate finish looks.
I gotta' say the vents around the tube sockets and the RCA jacks on the 2 really make the kit look as premium as it is.
Karl

Title: Re: Cover on shunt regulator 12AU7 tube
Post by: Karl5150 on May 17, 2021, 06:00:22 AM

That is "looks great".
Karl

Title: Re: Cover on shunt regulator 12AU7 tube
Post by: Tom-s on May 17, 2021, 10:05:21 PM

Quote from: Karl5150 on May 17, 2021, 02:35:55 AM

I gotta' say the vents around the tube sockets and the RCA jacks on the 2 really make the kit look as premium as it is.

I couldn’t agree more. These would look good on every Bottlehead kit.

Quote from: johnsonad on May 17, 2021, 01:48:51 AM

It looks great!  Enjoy!

Thanks! I do enjoy the build of all Bottlehead kits. Last few weekends I worked on some Cracks.
I cannot listen to the Eros just yet. Will finish it later this week.