Not until you carry out this mod will you realise just how bass shy the T-amp is. Throw away the output inductors and replace them with Wurth 10A types - RS part no. 308-8918. You will need space to install them vertically on the underside of the board.
Aircored versions are not the answer - smooth they may be, but have too much treble roll-off and rob the amp of its fast attack because of the wire length. After a few hours burn-in, the Wurth inductors - which have 5 or 6 times the core mass of the originals and short, massive wire, sound sumptuously sweet and add two octaves at least to the bass response.
This amp is used to run AKG-K1000's through a Shallco 31-step attenuator populated with Vishay bulk foils and Tantalums; Black Gate input caps. Of all the things you can do to this amp, choice of output inductors has, IMHO, the most impact on shaping its sound.
Aircored versions are not the answer - smooth they may be, but have too much treble roll-off and rob the amp of its fast attack because of the wire length. After a few hours burn-in, the Wurth inductors - which have 5 or 6 times the core mass of the originals and short, massive wire, sound sumptuously sweet and add two octaves at least to the bass response.
This amp is used to run AKG-K1000's through a Shallco 31-step attenuator populated with Vishay bulk foils and Tantalums; Black Gate input caps. Of all the things you can do to this amp, choice of output inductors has, IMHO, the most impact on shaping its sound.
Here is pic of the inductor, L approx 27mm.
An externally hosted image should be here but it was not working when we last tested it.
Anybody know of a US source for these inductors? Neither Digi-Key or Mouser stock the Wurth line as far as I can tell.
Or alternatively, anybody know if the API Delevan axial inductor #4590-103K would be an acceptable substitute? It's 10uh, rated at 6.44 amps; 0.16 ohms.
--Buckapound
Or alternatively, anybody know if the API Delevan axial inductor #4590-103K would be an acceptable substitute? It's 10uh, rated at 6.44 amps; 0.16 ohms.
--Buckapound
Well, these things sounded too good to be true - so I've ordered 8 for my T-amps. I'm wondering how they might be mounted though, so will be very keen to see the photos or get any further info on this!
I'm assuming they might also work for the AMP4 kits based on the 2050 board that are supposed to be out soon..
I'm assuming they might also work for the AMP4 kits based on the 2050 board that are supposed to be out soon..
It is probably just possible to mount these vertically on the chip side of the board, but better on the underside - one mounting hole drilled out slightly to accept a leg bent through 180degs. and the other leg connected with a short wire. Ideally, the inductors should be fixed with Araldite or similar and long lead-outs avoided - although temporary wiring with 1" leads do not seem to be detrimental. Work starts on Fri 17 and I will post pics ASAP.
I haven't checked the values of the AMP4 inductors, but there are other values available on the RS site - http://rswww.com/cgi-bin/bv/rswww/home.do?cacheID=ukie
I haven't checked the values of the AMP4 inductors, but there are other values available on the RS site - http://rswww.com/cgi-bin/bv/rswww/home.do?cacheID=ukie
clefmusic said:
hhhmmmmmm.... seen that kind of ferrite core/slug AND winding... in -=some=- PC PS.... yup.. but they are mounted to the board ..standing...
😀 😀 😀 😀 😀
see yah..
raff
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