Which driver is the "real" Fe103a??

[KT]

Thank you, Dave.

I don't know if you can send a file through PM or not. If not, please send it to kspam2 at netzero.com.

Thanks!
KT

 

[planet10]

I don't know if you can send a file through PM or not.

I can't send files thru the PM system, but you did send me a PM the other day so i have your gmail address -- which is better?

dave

 

[KT]

Hi Dave,

Gmail address is great.

Thanks,
KT

 

[planet10]

I cleaned it up a bit, and it is small enuff to just post here... have at it guys.

dave

QC appreciated....

 

[KT]

Thanks, Dave.

KT

 

[planet10]

Here is another variation, Sanyo labeled, from the 10F27 designation i'd say a Foster.

I've seen 1 pair, and adason makes some comments on the same driver here

http://www.diyaudio.com/forums/showthread.php?postid=753978#post753978

dave

 

[Cloth Ears]

Dave,

What sort of sensitivity do those Coral FE103a variants run at, please? I've seen FE103's listed as 89dB/W/m and 5W maximum - is this about right? Having SS amps only, I've only got about 2 (vintage) amps that would be able to drive this sort of driver without possible overkill occuring (ie. allowing anyone else access to the volume control).

Oops! I was reading these dates as this year - but the thread is a year old. I'm looking at possibly grabbing the pair that Bill F. is selling - but I'm not sure what I'm getting. Them being my (possibly) first FR driver.

 

[planet10]

What sort of sensitivity do those Coral FE103a variants run at, please? I've seen FE103's listed as 89dB/W/m and 5W maximum - is this about right?

Typically the efficiency is directly related to the Fs (but not always). the ones i've measures are 91-92 dB/1 watt.

dave

 

[Cloth Ears]

Thank you, kind sir.

 

[Smokehouse Bob]

A pic or 2 of the plugs in place. First, on older Tunnel Reflex pieces. Thanks Dave, they sound super!

 

[Smokehouse Bob]

Now in the 1197s

 

[planet10]

A pic or 2 of the plugs in place. First, on older Tunnel Reflex pieces. Thanks Dave, they sound super!

:^)

How did you like the surprise woods?

dave

 

[Smokehouse Bob]

You provided the best kind of surprise! I didn't expect poor quality or rough wood, but these are absolutely superb, thanks!

 

[Geoff H]

"i look forwrd to the day i can get at a facility that can remagnetize old drivers)'

Yeah, Dave. a bit late I know. It's not that hard to make a magnetiser. The conventional method would require removal of the cone/vc assembly. It may be possible to recharge with a 1/2 cycle of heavy current through a few turns wound around the U pole piece. Suitable power supplies can be found in the electro plating industry.

I can check with a former employer on the I-turns product needed, if I cant locate my old tech college books.

Geoff.

 

[planet10]

It's not that hard to make a magnetiser.

The actual magnetizer is not hard. Thinking thru all the safety features & implementing them such that the device doesn't kill you are quite a bit harder.

dave

 

[Geoff H]

Hi Dave, it's all low voltage once your on your end of the mains transformer. The treatment oven where I worked for a while was 3V dc at several hundred amps. At the final testing station, they were 12 volt solenoids, drawing 30 amps from memory. That was sufficient to charge alnico 6 slabs 3.75 x 3" x 1.5". (they were "wasted" on Westinghouse rail points motors)

Thinking about it last night, as soon as I get my hands an a suitable driver, I'll wrap a few turns of heavy cable around the U-pole, and hit it with a 12 car battery for a 1/2 second or so, then see if there is an increase in flux. If you try anything like that, make sure the VC is open circuit, or it soon will be.

One problem may be that the pole piece may saturate before enough flux has built up to overcome the hysteresis of the slug.

Where you do have to be careful, is making sure big magnets are secured. The g-force they can produce is quite astounding.

Regards,
Geoff.

 

[Smokehouse Bob]

Fellers, these drivers with the plugs, duct seal, and wool felt in a pair of Z-horns are truly pleasant! Thanks! The 1197s, while not 103s, hold their own in the bass department. I had a little buzzing from the paper around the poles at first. But the slow build up in layers using Podge cured it.

 

[Smokehouse Bob]

Whilst perusing the local durable goods, eco-friendly, recycling management facility (thrift store), I happened upon a pair of the ubiquitous "Realistic Solo 103" loudspeakers. Charming little wood boxes with a single alnico-backed driver labelled "Foster". Mmmmm.....tasty little pair for less than the price of a quart of Natty Ice. I have read about these and their sound but never seen a pair to pick up. I'm guessing they are comparable to the Tunnel Reflex mentioned elsewhere. Enjoy!

 

[KT]

Thanks for the pictures, Bob.

I have the exact same speakers. They sound decent as a little bookshelf speaker for the bedroom, but I'm sure those little drivers can be so much more.

Still, a cool little speaker.

Best,
KT

 

[Cal Weldon]

I am using the Foster 10F3 as an OB mid in my bedroom speakers. Wonderful driver especially when done up planet10 style.