BC907 Balanced Headphone Amplifier

Gilbert Y · Post by **Gilbert Y** » Sat Jul 30, 2016 12:43 pm

July 2016

This is the first of our new line of headphone amplifiers. There are going to be higher and lower end available in the near future.

The BC907 feature a master volume control with left and right trimmer to compensate those headphone which are not quite match between left and right channel.

Both Balanced and Single-Ended output have their own output impedance adjustment. Balanced output can be order in 4 Pin Female jack (standard) or One pair of 3 Pin XLR Female Jack (optional) at no additional cost.

Left and Right channel trimmers are beside the Master Volume control.

One pair of BAL and SE input is standard. More numbers or inputs are available as optional with additional cost.

The BC907 is designed to work with any of our GBC power suppli(es). This headphone amp doesn't come with any power supply. You can choose from one of the GBC model to go with this headphone amp. This make upgrade much easier in the future.

Like other Blue Circle products, other cosmetics are available. Such as front panel material, knob color, etc.

The BC907 is available as of today. Retail of the unit shown in the pictures is USD1,995.00.

wstagner · Post by **wstagner** » Sat Jul 30, 2016 12:55 pm

what's the min ps you suggest? gbc100?

Chowder_head · Post by **Chowder_head** » Sat Jul 30, 2016 3:23 pm

Not so clever, am I. See next post.

Chowder_head · Post by **Chowder_head** » Sat Jul 30, 2016 3:23 pm

Walt, What on earth is a GPC100?

wstagner · Post by **wstagner** » Sat Jul 30, 2016 8:11 pm

Hi, Mac.....a GBC100 is one of six different models of outboard power supplies in a piple that Blue Circle makes. These are designed to be used with this new headphone amp and several other models like the li'l 703 and all the FLT phono stages.

They can also be used as outboard power supplies (with some modification to the host unit) for non-Blue Circle phono stages, DACs, etc.

Of course because the package is not fancy, all the money is spent on the guts.

The models run from $95-$2295.

Chowder_head · Post by **Chowder_head** » Sun Jul 31, 2016 6:17 am

wstagner wrote:Hi, Mac.....a GBC100 is one of six different models of outboard power supplies in a piple that Blue Circle makes. These are designed to be used with this new headphone amp and several other models like the li'l 703 and all the FLT phono stages.

They can also be used as outboard power supplies (with some modification to the host unit) for non-Blue Circle phono stages, DACs, etc.

Of course because the package is not fancy, all the money is spent on the guts.

The models run from $95-$2295.

Thanks Walt. I eventually found more information via Google. I currently have a one-off SBH that has a large 2 position Cap Pack between the PS and the control unit/which also has a preamp and/or a dedicated on-off preamp unit, as well.

wstagner · Post by **wstagner** » Sun Jul 31, 2016 2:42 pm

You're probably, in part, responsible for the GBC line-up as commercial producks.

wstagner · Post by **wstagner** » Thu Aug 25, 2016 9:43 am

Just had the pleasure of auditioning the bc907.
The detail in the music is amazing. I'm hearing things in the recordings that I've never heard before.....including just a little distortion in parts of the recording itself!

The depth/clarity of the bass is excellent. It's actually EZ to distinguish between the bass guitar and the bass drum.

velomane · Post by **velomane** » Sat Dec 31, 2016 5:07 pm

Gilbert,

Will the model depicted in your original post be able to drive the HE-6?

garyj · Post by **garyj** » Mon May 29, 2017 7:07 pm

velomane wrote:Gilbert,

Will the model depicted in your original post be able to drive the HE-6?

This was awhile ago. I use a bc 204 for he6 with an adapter from gilbert. I see Bob neill has a FTth integrated used for a good price which would be a brilliant match. Fwiiw.

velomane · Post by **velomane** » Tue May 30, 2017 7:18 am

Thanks gary,

I've found another solution for my headphone listening post.