Sony TC-500A

I just picked up a complete Sony 500a. It has the white cone CHB's. I'm not sure what I'm going to do with them yet.

I'm kind of OCD about all things audio and my 12 Step program ain't working.

Here is some more info I found as part of my therapy.

 

marantzfan

Administrator
Staff member
In all my searches, I never actually looked at that thread. Great reference, thanks for sharing!
 
Thanks. No need.

To me, the vexing problem is there are no published speaker parameters for the CHB. Some claimed that they were fashioned after the Fostex FE103A. Most seem to agree that the CHB's perform well in larger cabinets or open baffles.

Then, there is this blog post: Sony / Coral 103a "Holey Basket"

If the speaker parameters in the post are correct, then, the CHB's would indeed perform well in larger cabinets or open baffles. For now, I am leaning toward the Lafite inspired and the open baffle.

The speaker parameters appear to be for the 16 ohm version. My understanding is that the 8 ohm version is more efficient and the parameters should be different.
 

Thermionics

Post Whore In Training
I can't see any reason why not. Oliver Sayes built my 45 SE using the Korneff circuit. In my case it is a single 6J5 for each channel. In the Simple 45/46 Joe calls for 1/2 6SL7 for each channel. The Sony PT has a lot of 6v capactity, so the extra tubes aren't a problem. The circuits should be near identical.
I'd be a bit concerned with the current-handling capability of the Sony PT - It's two beefiest 6.3V heater taps are only rated for 1.5A, and a Type 46 tube draws 1.75A. I'm assuming due to Ohm's law that any voltage divider used to drop the heater voltage from 6.3V to 2.5V will drop the current, however slightly.
 

John Frum

Secret Society Member
The speaker parameters appear to be for the 16 ohm version. My understanding is that the 8 ohm version is more efficient and the parameters should be different.
I’m in possession of a pair of 8 ohm CHBs from a TC-500a, and now two additional TC-500a decks.

It’s not high on my list of priorities, but I plan to test the T/S parameters of a representative sample of six of these drivers.

Looking forward to hearing what @paulbottlehead has to say about the output transformers.
 
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