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Orthodynamic Roundup - Page 445

post #6661 of 23352
Thread Starter 

One more old amp for headphones/speakers

I've mentioned this oldster a zillion times, but here's a picture: the Foster-built [EDIT: Well, we thought it was. It was in fact made by Tandy Corp. Electronics, TCE, in Korea] Realistic STA-2200, sold by Radio Shack from late '79 to mid '82:





Uses first-gen Hitachi lateral MOSFETs (2SK134 and 2SJ49) in TO-3 "Forbidden Planet" cases.

 


Edited by wualta - 5/23/10 at 9:05pm
post #6662 of 23352
Cool old reviews, and today, like then makers are still screwing up on the basics.

I had my doubts and suspicions about the T50RP. I had a feeling the driver was good but the housing was bad. I suspected the smaller bass was due to both circum design and the smallish diaphragm.

Ok, right on some, wrong on others.

As they come they are perectly listenable, nice and better than most orthos unmodded. I did the first round of mods and they improved nicely. I was still very suspicious of the housing and I knew I couldn't fix what was wrong with it so I went on an all-out assault.

These are now top of my phone pile. The driver is outstanding and needs no on-driver damping imo. The reflex dot is good but that's it. Properly mounted and housed with just a couple of disks of medium felt lining the cups they kick everything else I own or have tried. It's a closed, largish cup with small port like all my other most successful efforts.

The treble is sweet and extended, clear and sparkly as no other ortho I've heard. Smooth, fast, detailed and bass that is now full, powerful, deep and effortless in it's presentation.

On top of that, being circum also means extremely comfy, especially with the new pads and mounting setup. It's hard to believe it's the same phone. I think I'm going to totally cease looking for oldies on the bay, these are the best planar drivers I've met of any type. Fostex still messed it up with that crappy plastic housing. These drivers are so much better than Fostex, or anyone else realises.

Incredible, just outstanding! My ortho search is over.
post #6663 of 23352
Quote:
Originally Posted by smeggy View Post
These are now top of my phone pile.
Pics? And when are you going to get "member of the trade" status and offer the modded T50RP to the general public? I for one would probably get them.
post #6664 of 23352
MOT! MOT! MOT!... couldn't resist...
post #6665 of 23352
Quote:
Originally Posted by smeggy View Post
Incredible, just outstanding! My ortho search is over.
.
Congrats on the modding success .!

Quote:
Originally Posted by ludoo View Post
I for one would probably get them.
x2, me too.


Interestingly, check out the description of the T50RP model here:
http://www.bhphotovideo.com/bnh/cont...=REG&A=details
Quote:
Fostex T50RP Studio Headphones with Improved Transient Response
Seems like it must have been an official product upgrade, and we just missed seeing it.
post #6666 of 23352
Quote:
Originally Posted by Kabeer View Post
.
Congrats on the modding success .!


Interestingly, check out the description of the T50RP model here:
http://www.bhphotovideo.com/bnh/cont...=REG&A=details

Seems like it must have been an official product upgrade, and we just missed seeing it.
It's nice that smeggy likes his T50, I like mine as well, not as much as he likes his, but I like them just fine.

Nope, they have been saying this for 8 years
post #6667 of 23352
Quote:
Originally Posted by wualta View Post
I've mentioned this oldster a zillion times, but here's a picture: the Foster-built (in Korea) Realistic STA-2200, sold by Radio Shack from late '79 to mid '82:

Uses first-gen Hitachi lateral MOSFETs in TO-3 "Forbidden Planet" cases.
Looks nice for an old amp, but too busy for my taste. I bet is sounds better than it looks
post #6668 of 23352
I encourage everyone who does work on the wiki, to register at wiki-forum section to keep up with what the update goals are and all other such nonsense.
post #6669 of 23352
Quote:
Originally Posted by wualta View Post
It's a vented-closed design, not even close to a true open-back design. The best you can do is absorb backwaves so they don't bounce around in there with nothing to do.

As I recall, the fabric over the teeny vent is thin nonwoven, the same stuff that's covering the driver on the baffle so your ear can't see it. Don't see any reason not to open the other [blocked] vents with a dremel type tool, but I don't expect much audible improvement. Line the interior with craft felt-- that'll properly damp the vent(s) and cut down on reflections.

You might want to seal the cup halves where they join. There's also an anti-fart "port", just like the one Stax inflicted on the 007. You could try plugging that.
I'm sure the vents would have been more successful had the driver been mounted straight instead of diagonally, but I guess Fostex might have had issues fitting it in. Sounds like yet another involved modding scheme for one of my orthos. Hopefully I'll actually get to it, and the others.

I finally got around to buying a fosterphone for a pair of SFI drivers...

Quote:
Originally Posted by smeggy
Incredible, just outstanding! My ortho search is over.
Nice job, smeggy. We expect pictures.
I hope to get reasonably close with all the mods I intend to do. Basically see above quoted post by wualta plus some minor driver tweaking.
post #6670 of 23352
Quote:
Originally Posted by Faust2D View Post
It's nice that smeggy likes his T50, I like mine as well, not as much as he likes his, but I like them just fine.
Anything in particular missing or added that's detracting from your enthusiasm of the T50?
post #6671 of 23352
Morning time and they're still awesome.

I thought ahead this time and took some pics on the way.

Kingwood cups partly hollowed out.



Drivers in their trimmed down baffles



Glued solidly.



Drivers attached to the Rock Maple baffles, profiled like the original baffles



Dry run for testing before sealing up



Sealed and attached to the adjusted headband. I bent the arms in for better clamp/seal and cup clearance. Added fluff for good measure.



Showing the extra bent arms, I re-shaped the headband to suit, super comfy and they stay in place when rocking out



Just need to close off the end caps.

I'm such a happy little bunny right now.
Thanks guys.
post #6672 of 23352
Wow, those T50 drivers look like little toys, not some serious piece of audio hardware. Still, they look great in your woodies, though I cant see where the vents are located. Those are the stock earpads?
post #6673 of 23352
Quote:
Originally Posted by JadeEast View Post
Anything in particular missing or added that's detracting from your enthusiasm of the T50?
I imagine it's the same as with these before rehousing. Very nice but not exceptional in any particular way. I don't know that it's possible for the drivers to shine without really heavyweight mods. The T50RP is another flawed phone that is really punished by poorly thought out implementation.

The housing is thin live plastic with no damping/absorption inside and that causes that bloom/boomy bass without letting them go deep or strong in the right places. Good overall balance but so far from what they are capable of. I know it's a studio phone at a low retail price and making them sound really good would double their price at least. They could easily make a premium version to sell to the consumer market.
post #6674 of 23352
Quote:
Originally Posted by cetoole View Post
Wow, those T50 drivers look like little toys, not some serious piece of audio hardware. Still, they look great in your woodies, though I cant see where the vents are located. Those are the stock earpads?
The drivers are teeny wee things but they can kick like the big boys. The vents are little holes the same size as the cable hole but at the top of the cup, one hole per side. The pads are stock and the baffle is shaped as an oval like the original, the cups are round.
post #6675 of 23352
Nice work, ends caps will make that so sweet and I love the rock maple baffles. Any though of an angled driver version?
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